IBM PC Series 300 Maintenance Guide
The IBM PC Series 300 covers IBM's PC 330, 340, 350, 360 and 365 and the PC 300GL and 300PL desktops of the mid to late 1990s, sold under machine types in the 62xx, 65xx and 68xx ranges. IBM serviced them from the IBM Personal Computer 300 Series, 700 Series, IntelliStation Hardware Maintenance Manual (S83G-7789), which gives the power checks, POST and beep codes, memory rules, BIOS procedures and parts lists.[1]
Safety
[edit | edit source]Unplug the power cord before removing the cover. Supplies of this period have a manual voltage-selector switch; IBM's first power check is that it is set for the local mains voltage.[1][2] The supply is a sealed FRU in IBM's service procedures; if you open one, its primary capacitors hold mains-derived voltage after unplugging, so measure them before touching anything.
Identify the machine type
[edit | edit source]The machine type and model are on the label (for example Type 6862). IBM's service manual and technical information manuals are organised by type:[1]
| Name | Types | Processor (as IBM lists it) |
|---|---|---|
| PC 330/350 (486) | 6571, 6573, 6581, 6583 | 80486 |
| PC 330/350 | 6575, 6585 | Pentium 60 MHz |
| PC 330/350 | 6576, 6586 | Pentium 75–166 MHz |
| PC 330/350 | 6577, 6587 | Pentium 100–200 MHz |
| PC 340 | 6560 | Pentium 100/133 MHz |
| PC 360-S150 | 6598 | Pentium Pro 150/200 MHz |
| PC 365 | 6589 | Pentium Pro 180/200 MHz |
| PC 300 | 6272, 6282, 6284 | Pentium 133/233 MHz |
| PC 300 | 6562, 6592 | Pentium 166/200/233 MHz |
| PC 300 | 6561, 6591 | Pentium II 233/266/333 MHz |
| PC 300 | 6588 | Pentium II 233/266 MHz |
| PC 300 | 6265, 6275, 6285 | Pentium II 300–400 MHz |
| PC 300 | 6862, 6892 | Pentium II 266–400 MHz |
Types from the manual's memory tables (pp. 275–278).[1] Later types, such as the 6563, 6564, 6574 and 6565, are not in this edition.
Power supply checks
[edit | edit source]If the power light is off, the fan does not run or the machine will not switch off, IBM checks the voltage-selector switch, reseats the power cord, switch and system board connectors and the processor, and checks the cord and switch for continuity before measuring.[1] Measure with the supply cables connected to the board.
| Rail | Limits |
|---|---|
| +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 |
| +3.3 V (riser P10) | +3.17 to +3.46 V |
If the voltages are wrong and the cord is good, IBM's action is to replace the supply.[1] Types 6265, 6275, 6285, 6561, 6591, 6562, 6592, 6862 and 6892 have a 20-pin main power connector on the riser card; IBM gives its pin assignments on p. 30, including +5 V standby on pin 9, power good on pin 8 and the PS-ON remote enable on pin 14.[1]
For the 6275/6862 and 6285/6892, the technical information manual gives the supply ratings:[2]
| Output | Regulation | 145 W (6275, 6862), max | 200 W (6285, 6892), max |
|---|---|---|---|
| +5 V | +5 % / −4 % | 18.0 A | 20.0 A |
| +12 V | +5 % / −5 % | 4.2 A | 8.0 A |
| −12 V | +10 % / −9 % | 0.4 A | 0.4 A |
| −5 V | +10 % / −10 % | 0.3 A | 0.3 A |
| +3.3 V | +2 % / −2 % | 10.0 A | 20.0 A |
| +5 V auxiliary | +5 % / −10 % | 0.72 A | 0.75 A |
The input is 90–137 V or 180–265 V AC, set by the manual switch. Combined 3.3 V and 5 V output must not exceed 100 W on the 145 W supply or 120 W on the 200 W supply. The auxiliary 5 V feeds the power-management circuits and Wake on LAN, and the front-panel switch is not connected to the supply; a logic signal on the power connector turns it on and off.[2]
CMOS battery
[edit | edit source]The configuration and clock are kept by a lithium battery, IBM FRU 33F8354 in the parts lists for these types. IBM's caution: replace it only with part 33F8354 or an equivalent type recommended by the manufacturer; the battery can explode if misused; do not throw it into water, heat it above 100 °C, or repair or take it apart.[1]
POST codes that point at the battery or its settings:[1]
- 161: bad CMOS battery. Run Setup, then replace the battery.
- 162 on types 6562, 6592, 6862 and 6892: configuration mismatch. Run Setup and check the configuration; check whether a device has been added, removed or moved; switch external devices on before the computer; then the battery.
- 163: clock not updating or invalid time. Set the date and time, then the battery.
Setup is entered by pressing F1 when the prompt appears during start-up. Note the existing settings before changing anything.[1]
Memory
[edit | edit source]IBM's service manual lists supported memory per type. Selected entries:[1]
| Types | Modules | Maximum |
|---|---|---|
| 6571, 6573, 6581, 6583 | 70 ns 72-pin SIMMs, parity or non-parity, gold-plated | 128 MB |
| 6577, 6587 | 70 ns tin-lead 72-pin SIMMs in matched pairs (banks 1 and 2), plus a 168-pin DIMM in bank 0 | 192 MB |
| 6272, 6282, 6284 | EDO or SDRAM DIMMs, non-parity only; mixing allowed; module height no more than 1.2 in | 128 MB |
| 6562, 6592 | 3.3 V unbuffered EDO DIMMs, non-parity or ECC | 384 MB |
| 6561, 6591 | 3.3 V unbuffered 66 MHz SDRAM DIMMs, non-parity or ECC | 256 MB |
| 6588 | EDO DIMMs, non-parity or ECC; a mix configures as non-parity | 512 MB |
| 6265, 6275, 6285 | 3.3 V unbuffered 100 MHz non-registered SDRAM, non-parity or ECC | 384 MB |
| 6862, 6892 | 3.3 V unbuffered 100 MHz non-registered SDRAM, non-parity or ECC | 384 MB |
IBM's note for SIMMs: these machines take gold-plated SIMMs, except types 6560, 6576/6586, 6577/6587, 6598 and 6877/6887, which take tin-lead SIMMs only.[1] On the 6577/6587, 70 ns modules must be set up with the Setup Utility.[1]
BIOS
[edit | edit source]IBM's service manual says to install the latest BIOS before replacing any FRU, because a down-level BIOS can cause false errors and unnecessary system board replacement.[1] The update runs from a flash diskette: switch off, insert the diskette, switch on, choose the language, and enter the 7-digit serial number when asked.[1]
If a flash update is interrupted, the BIOS can be left unusable. IBM's recovery is to move the system board boot-block jumper or switch to the recover position, boot from the update diskette, run the update, then return the jumper to normal. Its location is on the system board layouts (from p. 358) and on the label inside the cover; the PC 360-S150 (6598) has its own recovery jumper procedure.[1]
Quiet start-up
[edit | edit source]Types 6265, 6275, 6285, 6561, 6591 and 6862 (among others) start "quiet" by default: no beep, no memory count and no checkpoint display when the POST finds no error. Enable Power-on Status in Setup to see them.[1] A silent start on these machines is not a fault.
Cleaning
[edit | edit source]- Blow dust out of the supply vents, fans and heatsinks with the machine unplugged, holding fan blades still.
- Clean card edge fingers with isopropyl alcohol on a foam swab.
Capacitors
[edit | edit source]Electrolytic capacitor failures on these boards are covered in IBM PC Series 300 Capacitor Replacement Guide.
Documentation
[edit | edit source]- PC 300/700/IntelliStation Hardware Maintenance Manual, S83G-7789-17 (September 1998)
- Technical information manuals:
- PC 300GL 6272 and 6282 (October 1997)
- PC 300GL 6561 and 6591 (February 1998)
- PC 300PL 6862 and 6892, PC 300GL 6275 and 6285 (June 1998)
- PC 300GL 6563, 6564 and 6574, PC 300PL 6565 (March 2000)
- PC 365 (6589), S84H-0334-01 (March 1997)
Related pages
[edit | edit source]- IBM PC Series 300
- IBM PC Series 300 Troubleshooting Guide
- IBM PC Series 300 Capacitor Replacement Guide
- IBM IntelliStation
- Recommended Tools
References
[edit | edit source]- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 IBM, IBM Personal Computer 300 Series, 700 Series, IntelliStation Hardware Maintenance Manual, S83G-7789-17, Eighteenth Edition, September 1998, hosted as File:IBM PC 300 700 IntelliStation Hardware Maintenance Manual S83G-7789-17 (Sep 1998).pdf. General checkout and the BIOS note (p. 2); power supply checks (pp. 28–29); 20-pin connector (p. 30); quiet POST (p. 32); beep symptoms (pp. 33–34); POST error codes (from p. 35); battery caution (p. 165); BIOS levels, flash update and boot-block recovery (pp. 227–228); Setup Utility (p. 248); system board memory (pp. 275–278); memory configurations (from p. 279).
- ↑ 2.0 2.1 2.2 IBM, Technical Information Manual, PC 300PL Types 6862 and 6892, PC 300GL Types 6275 and 6285, Preliminary Edition, June 1998, hosted as File:IBM PC 300PL 6862 6892 and PC 300GL 6275 6285 Technical Information Manual (June 1998).pdf. Chapter 4, "Power Supply" (pp. 24–25): 145 W and 200 W supplies, input ranges, output currents and regulation.