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Rewrite from IBM's PS/ValuePoint HMM, PSREF and service tips: generation table, IBM voltage limits (was cited to the ATX guide), battery FRUs, password procedures, cache corrections; remove uncited cover-interlock, belt and connector claims
 
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This guide documents preventive maintenance for the '''[[IBM PS/ValuePoint]]''' family — IBM's corporate / SMB ISA-based PC line from October 1992 to July 1995, machine types '''6381 / 6382 / 6384 / 6387'''. Procedures are common to the family where possible; per-submodel procedures are called out where they differ.
<templatestyles src="Template:StyledTable/styles.css" />
[[File:IBM PS-ValuePoint 325T angle.jpg|thumb|360x360px|IBM PS/ValuePoint 325T. (Image: Wikimedia Commons, CC BY 3.0)]]
The '''[[IBM PS/ValuePoint]]''' is IBM's ISA-bus desktop and tower range of 1992 to 1995. The first models, type 6384, were announced on 20 October 1992 and the last Performance Series models were withdrawn in August 1995.<ref name="psref-2">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', p. 2. [[:File:IBM PSREF IBM ValuePoint 1992 to 1995 Withdrawn.pdf|PDF]].</ref><ref name="psref-12">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', p. 12.</ref> IBM serviced the range at field-replaceable-unit (FRU) level, and its Hardware Maintenance Manual is the reference for everything below.


== Safety Warning ==
== Safety ==
The power supply runs from the mains. Unplug the power cord before removing the cover, and treat the supply's primary side as live until its reservoir capacitor has been measured and found discharged. Read IBM's safety information before servicing; it includes a caution that a wrongly replaced battery can explode.<ref name="hmm93-p28">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 28-31 (Safety Information). [[:File:IBM PS ValuePoint Hardware Maintenance Manual S61G-1423-01 (September 1993).pdf|PDF]].</ref>


All PS/ValuePoint PSUs contain mains-rectified bulk capacitors that hold a lethal charge after power-off. Before any work inside the PSU shell:
== Identifying the machine ==
 
The machine type and model (for example 6381-Fxx or 6384-W52) identify the system board, memory type and power supply. IBM's support notes for the 6384 place the serial number under the key lock on the metal casing and on the back of the unit.<ref name="e1f6">IBM, "IBM ValuePoint - Troubleshooting guide" (6384, version 1.13A.1, 1993), Service Hints & Tips JBAR-3QJS5D. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/e1f6.htm kev009 mirror]. Retrieved 2026-09-30.</ref>
# Power off and unplug the mains lead.
# Wait at least 30 seconds.
# Discharge the bulk capacitor through a 1 kΩ / 5 W resistor.
# Verify with a multimeter.
 
The PSU is universal-voltage on most submodels but uses a '''manual selector switch''' on the rear (115 V / 230 V). '''Verify the switch position before connecting mains''' — IBM ships boards with the selector at 230 V from the factory, and powering a US 120 V mains into a board set to 230 V will not damage anything but the system will not power on; powering 240 V mains into a board set to 115 V '''will''' destroy the PSU.<ref name="s094c49">[http://ps-2.kev009.com/pcpartnerinfo/ctstips/e1f6.htm kev009.com — IBM PS/2 and PC document mirror &mdash; e1f6]</ref>
 
== Identifying Your PS/ValuePoint ==
 
The machine type and submodel are printed on the rear-panel label (e.g. "Type 6381-Fxx", "Type 6384-1A3", "Type 6387-Yxx"). The MT maps to a Hardware Maintenance Manual (HMM):
 
* '''IBM HMM S61G-1423-01''' (September 1993) — covers 6381, 6382 /S, 6384, 6384 /D, 6384 P60/D, 6387 /T.<ref name="s984ed3">[http://ps-2.kev009.com/pccbbs/valuepnt/s61g1423.pdf kev009.com — IBM PS/2 and PC document mirror &mdash; s61g1423]</ref>
* '''IBM HMM S61G-1423-02''' (August 1996) — updated HMM covering 638x and the later 64xx transitional machine types.<ref name="s181a5a">[http://ps-2.kev009.com/basil.holloway/boo-to-pdf/S61G_1423_02.pdf kev009.com — IBM PS/2 and PC document mirror &mdash; S61G 1423 02]</ref>
* '''IBM 6387/T Supplement S71G-1875-00''' (May 1993) — tower-specific supplement.<ref name="s5deec6">[http://ps-2.kev009.com/basil.holloway/boo-to-pdf/S71G_1875_00.pdf kev009.com — IBM PS/2 and PC document mirror &mdash; S71G 1875 00]</ref>
 
== Opening the System Unit ==
 
Tools: Philips #2 screwdriver, anti-static strap.
 
# Power off and unplug all cables (mains, keyboard, mouse, monitor, parallel, serial).
# Locate the cover screws on the rear panel.
# Loosen the screws. The cover slides off to the rear and lifts up.
# Inside:
** Planar mounts horizontally on the chassis floor (desktop) or vertically (tower).
** PSU is at the rear left.
** Drive cage runs along the right side of the chassis (desktop) or top (tower).
** ISA / VLB / PCI slots are on a riser card that plugs into the planar at right angles to the planar.
 
=== Cover Lock ===
 
Some PS/ValuePoints ship with a '''cover lock''' that requires a small key to open. Several systems were shipped from the factory '''without''' cover lock keys; if a system arrives with the lock present but no key, order a replacement cover lock assembly from IBM (or a modern locksmith can drill it out).<ref name="s094c49" />
 
=== Cover Switch / Interlock ===
 
Some PS/ValuePoint chassis carry a cover-interlock switch — '''the system will not power on or power off if the cover is not seated properly'''.<ref name="s094c49" /> If the system refuses to power on with the cover off, depress the cover-interlock pin manually with a screwdriver for a smoke-test.
 
== Inspecting the Planar ==
 
Planar inspection items (in order):
 
# '''Lithium battery at B1 / BT1''' — verify the CR2032 cell is seated and shows no leakage. Replace if voltage is below 2.8 V.
# '''Floppy drive logic board''' — the Alps floppy drive used in many 6381-Fxx and similar boards has an SMD aluminium electrolytic capacitor next to the power connector that '''can leak'''.<ref name="sf08482">[https://www.zx.net.nz/computers/ibm/psvaluepoint_425sxsi/ zx.net.nz restoration notes &mdash; psvaluepoint 425sxsi]</ref> This is the most common cap failure on PS/ValuePoint — see [[IBM PS/ValuePoint Capacitor Replacement Guide]].
# '''Planar electrolytics''' — mostly through-hole; rarely fail; inspect for discolouration anyway.
# '''VLB / PCI slot connectors''' — clean with eraser or contact cleaner. VLB slots have a high pin count and oxidise.
# '''Video Frequency Controller chip''' — located just left of the Tseng video chip. May be either '''ICS''' or '''Chrontel''' branded depending on production date. The OS/2 2.00.1 SVGA driver fails on Chrontel boards — install the revised driver if you see this combination.<ref name="s094c49" />
 
== Regular Cleaning ==
 
* Soft brush and low-pressure compressed air for the planar, riser, ISA/VLB/PCI cards, drive bays and PSU vents.
* Hold any fan blades by hand if using compressed air.
* CPU heatsink (passive on 486SX-25 boards, fan-cooled on DX2/DX4 boards) — clean fins; on DX4 or P60/D, replace original thermal compound at first service.
* Clean ISA / VLB card edge fingers with a soft eraser or deoxidising contact cleaner.
* Clean Mini-DIN-6 keyboard / mouse connectors with deoxidising contact cleaner on a foam swab.
 
== PSU Voltage Checks ==
 
Probe the PSU output rails with a multimeter while the system is powered on (AT-style, not ATX).


{| class="wikitable styled-table" style="width:100%; text-align:center;"
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Typical PS/ValuePoint PSU rail tolerances (AT-style)'''
|+'''PS/ValuePoint generations'''
! Rail !! Acceptable range
! Group !! Available !! Types !! Processors !! System memory !! Supply
|-
|-
| +5 V || +4.75 V to +5.25 V
| 1992 models || Oct 1992 - Jul 1993 || 6384 || 325T (386SLC-25); 425SX, 433DX, 466DX2 || 325T: 2 MB soldered, two 72-pin sockets, 16 MB max. 486: eight 30-pin sockets in two banks of four, 32 MB max || 145 W
|-
|-
| +12 V || +11.4 V to +12.6 V
| Spring 1993 (/S, /D, /T) || Apr - Dec 1993 || 6382, 6384, 6387 || 425SX, 433SX, 433DX, 466DX2 || four 72-pin, 70 ns, 64 MB max || /S 100 W; /D, /T 200 W
|-
|-
| &minus;5 V || '''&minus;4.50 to &minus;5.50 V''' (&plusmn;10 %)
| Si || Aug 1993 - Nov 1994 || 6381 || 425SX, 433DX, 466DX2 || four 72-pin, 70 ns, 64 MB max; industry-standard parity only || 100 W
|-
|-
| &minus;12 V || '''&minus;10.80 to &minus;13.20 V''' (&plusmn;10 %)
| Fall 1993 (/D, /T) || Oct 1993 - Dec 1994 || 6384, 6387 || 425SX, 433SX, 433DX, 450DX2, 466DX2 || four 72-pin, 70 ns, 64 MB max || 200 W
|-
| P60/D || Oct 1993 - Apr 1995 || 6384 || Pentium 60 || four 72-pin, 70 ns, fitted in matched pairs, 128 MB max || 200 W
|-
| Performance Series || May 1994 - Aug 1995 || 6472, 6482, 6484, 6492, 6494 || 433SX to DX4-100 || four 72-pin, 70 ns, 128 MB max || /S 100 W; /D 200 W; /T 250 W
|}
|}
Dates, processors, memory and supply ratings are from IBM's product reference.<ref name="psref">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', pp. 2-3, 6, 8-9, 11-14.</ref> All PS/ValuePoint memory is parity memory.<ref name="psref" /> 6382 /S, 6384 /D and 6387 /T system boards come in a shorter Type 1 and a longer Type 2; IBM replaces Type 1 only with Type 1 and Type 2 only with Type 2.<ref name="hmm93-p27">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, p. 27.</ref> IBM's notes for the 6384 466DX2/D tell them apart by the SIMM sockets: with the ports facing away, Type 1 sockets run left to right and Type 2 sockets front to back.<ref name="859e">IBM, "IBM ValuePoint (Type 6384 466DX2/D) - System information", Product Information SWIS-3YSW4U. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/859e.htm kev009 mirror]. Retrieved 2026-09-30.</ref>


The two negative rails were previously given at &plusmn;5 %. Both the AT and the ATX specifications allow '''&plusmn;10 %''' on them, so a &minus;12 V rail at &minus;11.0 V is in specification and was being called a fault.<ref name="atxspec">Intel, ''ATX / ATX12V Power Supply Design Guide'', the specification these supplies are built to. It sets '''&plusmn;5 per cent''' on +3.3 V, +5 V, +12 V and +5 VSB, and '''&plusmn;10 per cent''' on &minus;5 V and &minus;12 V. The figures in this table are the specification's, not IBM's: IBM does not publish per-rail tolerances for these machines, and the supplies are bought-in industry-standard units.</ref> IBM publishes no per-rail tolerances of its own for these machines.
== Documentation ==
* [[:File:IBM PS ValuePoint Hardware Maintenance Manual S61G-1423-01 (September 1993).pdf|PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01]] (September 1993) covers the 6381, 6382, 6384 (including the P60/D) and 6387.
* [[:File:IBM PS ValuePoint Hardware Maintenance Manual S61G-1423-02 (August 1996).pdf|PS/ValuePoint Hardware Maintenance Manual, S61G-1423-02]] (August 1996) adds the 64xx types and corrects the power supply assignments.
* [[:File:IBM PS ValuePoint Type 6387 HMM Supplement S71G-1875-00 (May 1993).pdf|PS/ValuePoint Type 6387 Supplement, S71G-1875-00]] (May 1993) gives parts lists for the 6384, 6384 /D and 6387 /T.
* [[:File:IBM PSREF IBM ValuePoint 1992 to 1995 Withdrawn.pdf|Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn]] lists every model.


* '''6381-Si''' (100 W) — sufficient for entry config; +12 V will sag if multiple drives added.
== Cover and cover lock ==
* '''325T / original 6384''' (145 W) — design limit 10 W per slot.
The top cover slides onto the base frame and is held by the cover-release latch or latches and the cover lock.<ref name="hmm93-p27" /> Some 6384 systems were shipped without cover lock keys; IBM's fix was a new cover lock assembly.<ref name="e1f6" /> IBM also noted that some systems will not power on or off because the cover is not seated properly.<ref name="e1f6" /> Exploded views of each type are on pp. 70-73 of the 1993 manual.<ref name="hmm93-p70">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 70-73.</ref>
* '''6382 /S, 6384 /D, P60/D, 6387 /T''' (200 W) — universal voltage 90–137 V LV / 180–265 V HV.


== Voltage Selector ==
== Power supply and voltage checks ==
Every 63xx supply is universal with a manual voltage selector switch, and accepts 90-137 V AC on the low range and 180-265 V AC on the high range.<ref name="psref" /><ref name="ebaa">IBM, "IBM ValuePoint (Type 6381 486SX/Si) - System information", Product Information SWIS-3YEV69. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/ebaa.htm kev009 mirror]. Retrieved 2026-09-30.</ref><ref name="hmm93-spec">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 38-41 (Specifications).</ref> IBM's 6384 notes say the switch is preset to 230 V and must be set to 115 V on 115 V mains.<ref name="e1f6" /> Check it before connecting a machine of unknown history.


The rear-panel voltage selector switch '''must''' be set correctly for your mains:
If the power-on light is off or the supply fan is not running, IBM checks the power cord and the voltage-selector switch, then measures at the system board connector with the supply cables connected to the board:<ref name="hmm93-p6">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, p. 6 (Power Supply).</ref>


* '''115 V''' for 100–127 V mains (US, Canada, Japan, etc.).
{| class="wikitable styled-table" style="width:70%; text-align:center;"
* '''230 V''' for 200–240 V mains (UK, Europe, Australia, etc.).
|+'''System board power connector limits (IBM)'''
 
! Output !! Range
IBM ships boards with the selector at '''230 V''' from the factory. If you receive a North American unit and it does not power on, check this switch first.
|-
 
| +5 V || +4.75 to +5.25 V
== Battery — CR2032 Lithium Coin Cell ==
|-
| −5 V || −4.5 to −5.5 V
|-
| +12 V || +11.4 to +12.6 V
|-
| −12 V || −10.8 to −13.2 V
|-
| Power Good || +4.75 to +5.25 V
|}
If a voltage is out of range and the cord is good, IBM replaces the supply.<ref name="hmm93-p6" /> Supply ratings and FRU numbers are listed in the [[IBM PS/ValuePoint Capacitor Replacement Guide#Power supplies|capacitor replacement guide]]. On the 1992 6384 the supply is 145 W with a maximum of 10 W per adapter slot.<ref name="e1f6" />


The PS/ValuePoint planar battery is a '''standard CR2032 lithium coin cell''', not a soldered NiCd. Replacement procedure:
== Clock battery and Setup ==
The battery is a lithium coin cell, FRU 33F8354 (CR2032), in a holder at B1 (325T boards) or BT1; the 6384 P60/D uses FRU 71G6630.<ref name="hmm93-p22">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, p. 22 (parts listing).</ref><ref name="hmm93-layouts">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 74-99 (System Board Layouts).</ref> IBM's ValuePoint manual gives no replacement voltage. For the same FRU 33F8354 in the PS/2 Model 95, Ardent Tool gives 2.5 to 3.7 V, measured out of the holder with the power off, and replacement below 2.5 V.<ref name="ardent">[https://www.ardent-tool.com/misc/batteries.html "PS/2 RTC/CMOS Batteries"], Ardent Tool of Capitalism, based on content by Bob Eager and Peter H. Wendt. Retrieved 2026-09-30.</ref>


# Power off, unplug, discharge PSU.
Setup (the Configuration Utility) is in ROM and is entered by pressing F1 while the memory count runs at power-on. There is no reference or starter diskette.<ref name="e1f6" /><ref name="psref-3">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', p. 3.</ref> After a battery change, run Setup to restore the date, time and configuration.
# Locate the CR2032 in its snap-clip on the planar (typically labelled '''B1''' or '''BT1''').
# Pry the cell out with a fingernail or plastic spudger. '''Do not''' use a metal screwdriver — shorting + and − while levering can damage the planar power circuitry.
# Fit a fresh CR2032 with the '''+''' face up (matching the silkscreen).
# Power on; '''press F1 during memory count''' to enter Setup; re-enter date, time, boot order, drive parameters.


Symptoms of a dead battery (PS/ValuePoint inherits the classic IBM 161 / 162 / 163 POST cluster from the AT / PS/2 era):
The 1992 6384 425SX, 433DX and 466DX2 boards have a J2 external battery connector and a JP8 battery select jumper.<ref name="a26e">IBM, "IBM ValuePoint - Type 6384 system board", Service Hints & Tips GSMH-3CGEGA. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/a26e.htm kev009 mirror]. Retrieved 2026-09-30.</ref>


* '''161''' — Battery dead / disconnected.
=== Removing a forgotten power-on password ===
* '''162''' — CMOS checksum bad (configuration mismatch).
IBM's procedures, from the 1993 manual:<ref name="hmm93-p44">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 44-45 (Power-On Password).</ref>
* '''163''' — Time and date not set.
* 6381 and 6384 P60/D: remove the battery for 10 minutes, refit it and power on.
 
* 6384 325T: move the J8 jumper to join the centre pin and the pin at the opposite end, then power on. Leave the jumper there until the password is next reset.
After cell replacement, the '''F1 during memory count''' shortcut enters Setup. '''There is no Reference Diskette''' for PS/ValuePoint — Setup is in ROM.<ref name="s094c49" />
* 6384 425SX, 433DX and 466DX2: move JP8 to pins 2 and 3, short across capacitor C17 momentarily, return JP8 to pins 1 and 2, then power on holding both mouse buttons and release them when the cursor appears. Run the Configuration Utility afterwards.
 
* 6382 /S, 6384 /D and 6387 /T: move the jumper on J9 (Type 1 board) or J15 (Type 2 board) to join the centre pin and the pin at the opposite end, then power on.
=== External Battery Header ===
 
The planar carries a '''J2 "External Battery" header''' and a '''JP8 "Battery Select" jumper'''.<ref name="sd6b923">[http://ps-2.kev009.com/pcpartnerinfo/ctstips/a26e.htm kev009.com — IBM PS/2 and PC document mirror &mdash; a26e]</ref> For long-term storage, fit a remote CR2032 holder on flying leads to J2 and move JP8 to "External" — this lets you remove the planar's onboard cell without losing CMOS configuration during storage.


== Memory ==
== Memory ==
Memory rules differ by generation (see the table above).<ref name="psref" /> On the 1992 486 models the SIMMs go in as groups of four identical 30-pin modules, so the only configurations are 4, 8, 16, 20 and 32 MB.<ref name="psref-3" /> The 325T accepts 1, 2, 4 and 8 MB 72-pin SIMMs in either socket and recognises no more than 16 MB.<ref name="e1f6" /> The P60/D needs matched pairs because of its 64-bit memory bus.<ref name="psref-9">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', p. 9.</ref> The 6381 takes only industry-standard parity SIMMs, not IBM-type parity.<ref name="psref-14">IBM PC Institute, ''Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn'', p. 14.</ref> IBM's Symptom-to-FRU Index lists error 225 as unsupported memory.<ref name="hmm93-p15">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, p. 15.</ref>


Memory varies dramatically by submodel:
== Cache ==
 
External (L2) cache depends on the board:<ref name="psref-3" /><ref name="27ae">IBM, "IBM ValuePoint - Product description", Service Hints & Tips GSMH-3CEHMG. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/27ae.htm kev009 mirror]. Retrieved 2026-09-30.</ref>
* '''325T (386SLC)''' — 72-pin parity SIMM, 70–85 ns; 2 MB soldered + 2 sockets; 16 MB system max.
* 1992 6384: none on the 325T and 425SX; 128 KB soldered and not upgradeable on the 433DX and 466DX2.
* '''Original 1992 6384 (425SX, 433DX, 466DX2)''' — '''30-pin parity SIMM''' (the only PS/ValuePoint family with 30-pin), 70–80 ns, installed in banks of 4, max 32 MB.
* 6381: none on the 425SX/Si; 128 KB or 256 KB field upgrade on the DX and DX2 boards.
* '''All other 6381 /Si, 6382 /S, 6384 /D, 6387 /T''' — '''72-pin parity SIMM''', 70 ns (up to 85 ns), 4 sockets, max 64 MB.
* 6382 /S and 6384 /D: 128 KB or 256 KB; standard on the 466DX2, a field upgrade on the others.
* '''6384 P60/D''' — 72-pin parity SIMM, 70 ns, installed in '''pairs''' for dual-channel, max 128 MB.
* 6387 /T: 128 KB standard on the 466DX2 /T, upgradeable to 256 KB; a field upgrade on the 433DX /T.
 
* 6384 P60/D: 256 KB standard.
All PS/ValuePoint memory is '''parity'''. Do not fit non-parity SIMMs — the POST will halt at a 2xx memory error.
Type 1 boards use write-through cache and Type 2 boards write-back; IBM's 256 KB upgrades are FRU 92F0398 (write-through) and 92F0400 (write-back).<ref name="859e" /> IBM's action for error 12904 is to run diagnostics, then replace the L2 cache adapter.<ref name="hmm93-p17">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, p. 17.</ref>
 
== Storage Maintenance ==
 
* '''IDE drives''' — clean drive connector. Original IBM drives (80 / 120 / 170 / 212 / 245 / 340 / 420 / 527 MB) are aged 25+ years and are unreliable; replace with CompactFlash-to-IDE or XT-IDE / IDE2SD adapter for long-term use.
* '''Floppy drives''' — Alps drives have the SMD electrolytic on the drive logic board that '''can leak'''. See [[IBM PS/ValuePoint Capacitor Replacement Guide]]. Replace head-cleaning belt if drive is intermittent.
* '''Optional SCSI''' — Future Domain 8-bit (TMC-850IBM) or 16-bit AT Fast SCSI adapter. Driver disks for DOS / OS/2 / Windows.
 
=== 2.88 MB Floppy Support ===
 
* '''486 boards''' — do '''not''' support 2.88 MB drives.
* '''P60/D''' — '''does''' support 2.88 MB drives.
 
== Connector Care ==
 
* '''Keyboard''' — 5-pin AT DIN on most submodels (PS/2 Mini-DIN-6 on later /D boards).
* '''Mouse''' — PS/2 Mini-DIN-6 on planar.
* '''Serial''' — DB-9 male × 2 on most boards.
* '''Parallel''' — DB-25 female on planar.
* '''Video''' — 15-pin DSUB VGA on planar (Cirrus / Tseng / S3 / ATI Mach32 chip-dependent).
* '''Cover lock''' — IBM-keyed cylinder, OEM by Chicago Lock Company.
 
== BIOS Update Procedure ==
 
All Type-2 boards (6382, 6384 VP2, 6387) share '''flash BIOS image L6JT70A.EXE (version 70)'''.<ref name="s434595">[http://ps-2.kev009.com/pcpartnerinfo/ctstips/ceda.htm kev009.com — IBM PS/2 and PC document mirror &mdash; ceda]</ref>


# Download the BIOS image from IBM's archive (or from a mirror such as the kev009 collection).
== Drives ==
# Write to a '''write-protected DOS floppy'''. Critical: do '''not''' run the update from a Windows 95 / 98 / NT command prompt with the floppy unprotected — the diskette can be corrupted by the OS.
Standard hard disks are 3.5-inch Slimline AT (IDE) drives of 80 to 527 MB; IBM's drive table gives geometry and power for each.<ref name="hmm93-p37">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-01, September 1993, pp. 37 and 42.</ref> Jumper settings are on pp. 68-69 of the 1993 manual. Every model has a 3.5-inch 1.44 MB diskette drive.<ref name="hmm93-p37" /> A 2.88 MB drive does not work in the 1992 6384;<ref name="e1f6" /> the P60/D supports one,<ref name="5e9a">IBM, "IBM ValuePoint (Type 6384 - P60/D) - System information", Product Information SWIS-3YG25F. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/5e9a.htm kev009 mirror]. Retrieved 2026-09-30.</ref> and the 64xx types list it as an option.<ref name="hmm96-41">IBM, ''PS/ValuePoint Hardware Maintenance Manual'', S61G-1423-02, August 1996, topic 4.1. [[:File:IBM PS ValuePoint Hardware Maintenance Manual S61G-1423-02 (August 1996).pdf|PDF]].</ref> The Alps diskette drive fitted to some machines has a surface-mount electrolytic capacitor beside its power connector that can leak; see the [[IBM PS/ValuePoint Capacitor Replacement Guide]] and [[Floppy Drive Repair]].
# Boot from the DOS floppy.
# Run the BIOS update; do not power off until done.
# After update, re-enter Setup (F1 during memory count) and re-confirm boot order.


Per-MT BIOS images:
IBM's optional 8-bit SCSI adapter is the Future Domain TMC-850IBM, factory set to BIOS address CA00h with interrupts disabled.<ref name="e1f6" />


* '''6381 /Si''' — L8JT52A.EXE.
== BIOS updates ==
* '''6382 /S, 6384 /D, 6387 /T''' — L6JT70A.EXE (v70).
IBM's flash BIOS images:
* '''6384 P60/D''' — VPP60FL6.EXE.
* 6381 (486SX/Si): L8JT52A.EXE.<ref name="ebaa" />
* 6382, 6384 (VP2) and 6387: L6JT70A.EXE, version 70, released May 1997.<ref name="ceda">IBM, "IBM ValuePoint (Type 6382, 6384 VP2, 6387) - L6JT70A - Flash BIOS update", System Support Disks YAST-3GUQBN. [http://ps-2.kev009.com/pcpartnerinfo/ctstips/ceda.htm kev009 mirror]. Retrieved 2026-09-30.</ref>
* 6384 P60/D: VPP60FL6.EXE.<ref name="5e9a" />
The .EXE file builds a bootable update diskette. IBM's instructions are to write-protect that diskette immediately, because Windows 95, 98 or NT may make it unusable, then boot from it with the machine powered off first.<ref name="ceda" /> The Intel P24T-83 Pentium OverDrive on the 466DX2/D needs BIOS version 68 or later, with the processor jumpers (J10 and J11 on Type 1, J17 and J18 on Type 2) in the OD position, towards the rear of the board.<ref name="859e" />


'''BIOS v68 or later''' is required to enable '''P24T-83 Pentium OverDrive''' on 486 boards.<ref name="sb5cad8">[http://ps-2.kev009.com/pcpartnerinfo/ctstips/859e.htm kev009.com — IBM PS/2 and PC document mirror &mdash; 859e]</ref>
== Cleaning ==
 
* Blow dust out of the supply vents, fan and board with low-pressure air, holding the fan still.
== Cache Configuration ==
* Clean adapter edge connectors and the riser sockets with contact cleaner if cards are unreliable.
 
* Inspect the battery holder, the diskette drive board and the supply for leaked electrolyte at each service.
L2 cache is field-upgradeable on most PS/ValuePoint 486 boards:
 
* '''6381 SX / DX''' — supports 128 KB or 256 KB L2 cache module.
* '''6382 /S, 6384 /D, 6387 /T''' — 128 KB or 256 KB L2.
* '''Type 1''' boards — write-through L2.
* '''Type 2''' boards — write-back L2.
* '''466DX2''' — 256 KB L2 standard.
 
If the L2 cache module is missing and a 12902 / 12904 POST code appears, fit an IBM cache module of the correct type.
 
== Recommended Tools ==
 
* Philips #2 screwdriver.
* Anti-static strap.
* Digital multimeter (DC and AC modes).
* IPA + foam swabs.
* Soldering iron with fine tip + solder wick (for floppy drive logic board recap).
* Hot-air rework station (optional, useful for the floppy drive SMD cap).
* Spare CR2032 cells.
* DOS bootable floppy (or IDE-to-CF adapter with bootable DOS image).
* DOS-formatted floppy + BIOS image for your specific MT.
* IBM HMM PDF for your machine type.
 
== Related Pages ==


== Related pages ==
* [[IBM PS/ValuePoint]]
* [[IBM PS/ValuePoint]]
* [[IBM PS/ValuePoint Troubleshooting Guide]]
* [[IBM PS/ValuePoint Troubleshooting Guide]]
* [[IBM PS/ValuePoint Capacitor Replacement Guide]]
* [[IBM PS/ValuePoint Capacitor Replacement Guide]]
* IBM PS/ValuePoint Video Mod Guide
* [[Recommended Tools]]
* [[Recommended Tools]]


== References ==
== References ==
<references />
<references />
=== Further reading ===
* [http://ps-2.kev009.com/pccbbs/valuepnt/s61g1423.pdf IBM Hardware Maintenance Manual S61G-1423-01 (Sep 1993)]. Authoritative HMM for the 638x family.
* [http://ps-2.kev009.com/basil.holloway/boo-to-pdf/S61G_1423_02.pdf IBM HMM S61G-1423-02 (Aug 1996)]. Updated HMM including 64xx transitional models.
* [http://ps-2.kev009.com/basil.holloway/boo-to-pdf/S71G_1875_00.pdf IBM 6387/T Supplement S71G-1875-00 (May 1993)]. Tower-specific supplement.
* [http://ps-2.kev009.com/pcpartnerinfo/ctstips/e1f6.htm IBM PS/ValuePoint Tips & Tricks, kev009 mirror]. Battery (lithium) confirmation, F1 enters Setup, voltage selector, cover lock, ICS/Chrontel video chip note.
* [http://ps-2.kev009.com/pcpartnerinfo/ctstips/a26e.htm IBM PS/ValuePoint system board layouts]. B1/BT1 battery position, J2 external battery, JP8 battery select.
* [http://ps-2.kev009.com/pcpartnerinfo/ctstips/859e.htm IBM PS/ValuePoint 6382/S, 6384/D, 6387/T system info]. 200 W PSU, OverDrive jumpers, Type 1 vs Type 2, IBMKBFIX.
* [http://ps-2.kev009.com/pcpartnerinfo/ctstips/ceda.htm IBM PS/ValuePoint flash BIOS update procedure]. L6JT70A.EXE for Type-2 boards, write-protect floppy under Windows.
* [https://www.zx.net.nz/computers/ibm/psvaluepoint_425sxsi/ zx.net.nz — IBM PS/ValuePoint 425SX/Si hands-on documentation]. CR2032 leakage report, Alps floppy SMD cap note.


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Latest revision as of 21:25, 30 September 2026

IBM PS/ValuePoint 325T. (Image: Wikimedia Commons, CC BY 3.0)

The IBM PS/ValuePoint is IBM's ISA-bus desktop and tower range of 1992 to 1995. The first models, type 6384, were announced on 20 October 1992 and the last Performance Series models were withdrawn in August 1995.[1][2] IBM serviced the range at field-replaceable-unit (FRU) level, and its Hardware Maintenance Manual is the reference for everything below.

Safety

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The power supply runs from the mains. Unplug the power cord before removing the cover, and treat the supply's primary side as live until its reservoir capacitor has been measured and found discharged. Read IBM's safety information before servicing; it includes a caution that a wrongly replaced battery can explode.[3]

Identifying the machine

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The machine type and model (for example 6381-Fxx or 6384-W52) identify the system board, memory type and power supply. IBM's support notes for the 6384 place the serial number under the key lock on the metal casing and on the back of the unit.[4]

PS/ValuePoint generations
Group Available Types Processors System memory Supply
1992 models Oct 1992 - Jul 1993 6384 325T (386SLC-25); 425SX, 433DX, 466DX2 325T: 2 MB soldered, two 72-pin sockets, 16 MB max. 486: eight 30-pin sockets in two banks of four, 32 MB max 145 W
Spring 1993 (/S, /D, /T) Apr - Dec 1993 6382, 6384, 6387 425SX, 433SX, 433DX, 466DX2 four 72-pin, 70 ns, 64 MB max /S 100 W; /D, /T 200 W
Si Aug 1993 - Nov 1994 6381 425SX, 433DX, 466DX2 four 72-pin, 70 ns, 64 MB max; industry-standard parity only 100 W
Fall 1993 (/D, /T) Oct 1993 - Dec 1994 6384, 6387 425SX, 433SX, 433DX, 450DX2, 466DX2 four 72-pin, 70 ns, 64 MB max 200 W
P60/D Oct 1993 - Apr 1995 6384 Pentium 60 four 72-pin, 70 ns, fitted in matched pairs, 128 MB max 200 W
Performance Series May 1994 - Aug 1995 6472, 6482, 6484, 6492, 6494 433SX to DX4-100 four 72-pin, 70 ns, 128 MB max /S 100 W; /D 200 W; /T 250 W

Dates, processors, memory and supply ratings are from IBM's product reference.[5] All PS/ValuePoint memory is parity memory.[5] 6382 /S, 6384 /D and 6387 /T system boards come in a shorter Type 1 and a longer Type 2; IBM replaces Type 1 only with Type 1 and Type 2 only with Type 2.[6] IBM's notes for the 6384 466DX2/D tell them apart by the SIMM sockets: with the ports facing away, Type 1 sockets run left to right and Type 2 sockets front to back.[7]

Documentation

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Cover and cover lock

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The top cover slides onto the base frame and is held by the cover-release latch or latches and the cover lock.[6] Some 6384 systems were shipped without cover lock keys; IBM's fix was a new cover lock assembly.[4] IBM also noted that some systems will not power on or off because the cover is not seated properly.[4] Exploded views of each type are on pp. 70-73 of the 1993 manual.[8]

Power supply and voltage checks

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Every 63xx supply is universal with a manual voltage selector switch, and accepts 90-137 V AC on the low range and 180-265 V AC on the high range.[5][9][10] IBM's 6384 notes say the switch is preset to 230 V and must be set to 115 V on 115 V mains.[4] Check it before connecting a machine of unknown history.

If the power-on light is off or the supply fan is not running, IBM checks the power cord and the voltage-selector switch, then measures at the system board connector with the supply cables connected to the board:[11]

System board power connector limits (IBM)
Output Range
+5 V +4.75 to +5.25 V
−5 V −4.5 to −5.5 V
+12 V +11.4 to +12.6 V
−12 V −10.8 to −13.2 V
Power Good +4.75 to +5.25 V

If a voltage is out of range and the cord is good, IBM replaces the supply.[11] Supply ratings and FRU numbers are listed in the capacitor replacement guide. On the 1992 6384 the supply is 145 W with a maximum of 10 W per adapter slot.[4]

Clock battery and Setup

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The battery is a lithium coin cell, FRU 33F8354 (CR2032), in a holder at B1 (325T boards) or BT1; the 6384 P60/D uses FRU 71G6630.[12][13] IBM's ValuePoint manual gives no replacement voltage. For the same FRU 33F8354 in the PS/2 Model 95, Ardent Tool gives 2.5 to 3.7 V, measured out of the holder with the power off, and replacement below 2.5 V.[14]

Setup (the Configuration Utility) is in ROM and is entered by pressing F1 while the memory count runs at power-on. There is no reference or starter diskette.[4][15] After a battery change, run Setup to restore the date, time and configuration.

The 1992 6384 425SX, 433DX and 466DX2 boards have a J2 external battery connector and a JP8 battery select jumper.[16]

Removing a forgotten power-on password

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IBM's procedures, from the 1993 manual:[17]

  • 6381 and 6384 P60/D: remove the battery for 10 minutes, refit it and power on.
  • 6384 325T: move the J8 jumper to join the centre pin and the pin at the opposite end, then power on. Leave the jumper there until the password is next reset.
  • 6384 425SX, 433DX and 466DX2: move JP8 to pins 2 and 3, short across capacitor C17 momentarily, return JP8 to pins 1 and 2, then power on holding both mouse buttons and release them when the cursor appears. Run the Configuration Utility afterwards.
  • 6382 /S, 6384 /D and 6387 /T: move the jumper on J9 (Type 1 board) or J15 (Type 2 board) to join the centre pin and the pin at the opposite end, then power on.

Memory

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Memory rules differ by generation (see the table above).[5] On the 1992 486 models the SIMMs go in as groups of four identical 30-pin modules, so the only configurations are 4, 8, 16, 20 and 32 MB.[15] The 325T accepts 1, 2, 4 and 8 MB 72-pin SIMMs in either socket and recognises no more than 16 MB.[4] The P60/D needs matched pairs because of its 64-bit memory bus.[18] The 6381 takes only industry-standard parity SIMMs, not IBM-type parity.[19] IBM's Symptom-to-FRU Index lists error 225 as unsupported memory.[20]

Cache

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External (L2) cache depends on the board:[15][21]

  • 1992 6384: none on the 325T and 425SX; 128 KB soldered and not upgradeable on the 433DX and 466DX2.
  • 6381: none on the 425SX/Si; 128 KB or 256 KB field upgrade on the DX and DX2 boards.
  • 6382 /S and 6384 /D: 128 KB or 256 KB; standard on the 466DX2, a field upgrade on the others.
  • 6387 /T: 128 KB standard on the 466DX2 /T, upgradeable to 256 KB; a field upgrade on the 433DX /T.
  • 6384 P60/D: 256 KB standard.

Type 1 boards use write-through cache and Type 2 boards write-back; IBM's 256 KB upgrades are FRU 92F0398 (write-through) and 92F0400 (write-back).[7] IBM's action for error 12904 is to run diagnostics, then replace the L2 cache adapter.[22]

Drives

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Standard hard disks are 3.5-inch Slimline AT (IDE) drives of 80 to 527 MB; IBM's drive table gives geometry and power for each.[23] Jumper settings are on pp. 68-69 of the 1993 manual. Every model has a 3.5-inch 1.44 MB diskette drive.[23] A 2.88 MB drive does not work in the 1992 6384;[4] the P60/D supports one,[24] and the 64xx types list it as an option.[25] The Alps diskette drive fitted to some machines has a surface-mount electrolytic capacitor beside its power connector that can leak; see the IBM PS/ValuePoint Capacitor Replacement Guide and Floppy Drive Repair.

IBM's optional 8-bit SCSI adapter is the Future Domain TMC-850IBM, factory set to BIOS address CA00h with interrupts disabled.[4]

BIOS updates

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IBM's flash BIOS images:

  • 6381 (486SX/Si): L8JT52A.EXE.[9]
  • 6382, 6384 (VP2) and 6387: L6JT70A.EXE, version 70, released May 1997.[26]
  • 6384 P60/D: VPP60FL6.EXE.[24]

The .EXE file builds a bootable update diskette. IBM's instructions are to write-protect that diskette immediately, because Windows 95, 98 or NT may make it unusable, then boot from it with the machine powered off first.[26] The Intel P24T-83 Pentium OverDrive on the 466DX2/D needs BIOS version 68 or later, with the processor jumpers (J10 and J11 on Type 1, J17 and J18 on Type 2) in the OD position, towards the rear of the board.[7]

Cleaning

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  • Blow dust out of the supply vents, fan and board with low-pressure air, holding the fan still.
  • Clean adapter edge connectors and the riser sockets with contact cleaner if cards are unreliable.
  • Inspect the battery holder, the diskette drive board and the supply for leaked electrolyte at each service.
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References

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  1. ↑ IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, p. 2. PDF.
  2. ↑ IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, p. 12.
  3. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 28-31 (Safety Information). PDF.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 IBM, "IBM ValuePoint - Troubleshooting guide" (6384, version 1.13A.1, 1993), Service Hints & Tips JBAR-3QJS5D. kev009 mirror. Retrieved 2026-09-30.
  5. ↑ 5.0 5.1 5.2 5.3 IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, pp. 2-3, 6, 8-9, 11-14.
  6. ↑ 6.0 6.1 IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, p. 27.
  7. ↑ 7.0 7.1 7.2 IBM, "IBM ValuePoint (Type 6384 466DX2/D) - System information", Product Information SWIS-3YSW4U. kev009 mirror. Retrieved 2026-09-30.
  8. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 70-73.
  9. ↑ 9.0 9.1 IBM, "IBM ValuePoint (Type 6381 486SX/Si) - System information", Product Information SWIS-3YEV69. kev009 mirror. Retrieved 2026-09-30.
  10. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 38-41 (Specifications).
  11. ↑ 11.0 11.1 IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, p. 6 (Power Supply).
  12. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, p. 22 (parts listing).
  13. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 74-99 (System Board Layouts).
  14. ↑ "PS/2 RTC/CMOS Batteries", Ardent Tool of Capitalism, based on content by Bob Eager and Peter H. Wendt. Retrieved 2026-09-30.
  15. ↑ 15.0 15.1 15.2 IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, p. 3.
  16. ↑ IBM, "IBM ValuePoint - Type 6384 system board", Service Hints & Tips GSMH-3CGEGA. kev009 mirror. Retrieved 2026-09-30.
  17. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 44-45 (Power-On Password).
  18. ↑ IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, p. 9.
  19. ↑ IBM PC Institute, Personal Systems Reference: IBM ValuePoint, 1992 to 1995 – withdrawn, p. 14.
  20. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, p. 15.
  21. ↑ IBM, "IBM ValuePoint - Product description", Service Hints & Tips GSMH-3CEHMG. kev009 mirror. Retrieved 2026-09-30.
  22. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, p. 17.
  23. ↑ 23.0 23.1 IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-01, September 1993, pp. 37 and 42.
  24. ↑ 24.0 24.1 IBM, "IBM ValuePoint (Type 6384 - P60/D) - System information", Product Information SWIS-3YG25F. kev009 mirror. Retrieved 2026-09-30.
  25. ↑ IBM, PS/ValuePoint Hardware Maintenance Manual, S61G-1423-02, August 1996, topic 4.1. PDF.
  26. ↑ 26.0 26.1 IBM, "IBM ValuePoint (Type 6382, 6384 VP2, 6387) - L6JT70A - Flash BIOS update", System Support Disks YAST-3GUQBN. kev009 mirror. Retrieved 2026-09-30.


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