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Replacing electrolytic capacitors (recapping) in your '''Macintosh SE''' is essential for maintaining long-term reliability, consistent power delivery, and clean video output. Aging capacitors can cause instability, poor display quality, or outright system failure. Proactively replacing these components greatly improves the health and performance of your SE.
The '''Macintosh SE''' logic board is not one of the Macs that leaks. Its capacitors are the older axial type rather than the surface-mount parts that destroy SE/30, Classic and Classic II boards, and Recap-a-Mac — which has recapped a great many compact Macs — says the SE very rarely needs recapping at all.<ref name="recapse" /> The parts that do need attention are the on-board lithium battery, the analogue board and the power supply.


== 🔍 Capacitor Inspection ==
== Safety ==


Before beginning a recap, check each capacitor for visual signs of failure:
{{Warning|'''The CRT anode holds charge after power-off.''' Discharge it before working inside — see [[CRT Discharge Procedure]].


* '''Bulging Tops''' – A domed capacitor top indicates internal gas pressure and failure.
'''The power supply is a separate mains-connected module.''' Depending on which unit is fitted, its primary reservoir is a 620&nbsp;µF 400&nbsp;V capacitor or a series pair of 330&nbsp;µF 200&nbsp;V capacitors.<ref name="c5se" /> Those sit at rectified mains potential and stay charged after the machine is unplugged. Measure across them before touching the primary side. Recapping the supply is a normal repair — just measure first.
* '''Leaking Electrolyte''' – Brown or white crust near the leads signals electrolyte leakage.
* '''Corrosion or PCB Staining''' – Green residue or darkened board areas mean urgent replacement is needed.


Use a multimeter with ESR testing capabilities if available to confirm health.
'''The lithium battery can explode if mishandled.''' Apple's own warning, verbatim: "If handled or discarded improperly, the lithium battery in the Macintosh SE could explode."<ref name="APPLESS" />


== 📋 Macintosh SE Capacitor List ==
Apple rates the SE at 90–140&nbsp;V AC or 170–270&nbsp;V AC, 47–63&nbsp;Hz, 100&nbsp;W maximum.<ref name="APPLESS" />}}


=== 🧯 Analog Board Capacitors ===
== Do the Battery First ==
The Macintosh SE analog board uses the same layout and component values as the Macintosh Plus, and should be recapped entirely for reliability.
 
The SE keeps PRAM alive with a soldered 1/2&nbsp;AA lithium cell, which Apple describes as a "seven-year lithium battery".<ref name="APPLESS" /> It is now several times that age. Apple's own verification procedure is to remove the logic board, measure across the cell on the 10&nbsp;V DC range, and '''replace it if it reads below 2.8&nbsp;V'''.<ref name="APPLESS" />
 
A leaking cell will take traces with it. See [[Battery Explosion, Capacitor or Corrosion Damage]].
 
== Capacitor Inspection ==
 
* '''Bulging tops''' — a healthy capacitor has a flat top.
* '''Leaking electrolyte''' — brown or white crust at the leads.
* '''Corrosion or board staining''' near the base of a capacitor.
 
An ESR meter is more use than a capacitance meter here: these parts usually fail by drying out and going high-ESR rather than by losing capacitance. See [[Capacitor Failure Symptoms]].
 
== Logic Board ==
 
The SE logic board — Apple part '''820-0176''' or '''820-0250''' depending on revision — carries eleven electrolytic capacitors.<ref name="c5se" />
 
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:60%; text-align:center;"
|+ '''Macintosh SE logic board 820-0176 / 820-0250'''
|-
! Reference !! Capacitance !! Voltage
|-
| C4 || 33 µF || 16 V
|-
| C11 || 33 µF || 16 V
|-
| C13 || 33 µF || 16 V
|-
| C16 || 33 µF || 16 V
|-
| C32 || 33 µF || 16 V
|-
| C34 || 33 µF || 16 V
|-
| C36 || 1 µF || 50 V
|-
| C37 || 33 µF || 16 V
|-
| C38 || 33 µF || 16 V
|-
| C62 || 33 µF || 16 V
|-
| C86 || 33 µF || 16 V
|}
 
Two independent sources agree on the totals: Console5 lists the ten 33&nbsp;µF 16&nbsp;V positions and one 1&nbsp;µF 50&nbsp;V position above,<ref name="c5se" /> and Recap-a-Mac's photographic guide, made from a physical SE board, counts exactly '''10&nbsp;×&nbsp;33&nbsp;µF 16&nbsp;V and 1&nbsp;×&nbsp;1&nbsp;µF 50&nbsp;V'''.<ref name="recapse" />
 
[[File:Macintosh SE Logic Board Capacitors.jpg|thumb|Macintosh SE logic board capacitor locations|center|535x535px]]
 
== Analogue Board ==
 
'''The SE and SE/30 do not use the Macintosh Plus power/sweep board.''' The Plus combines supply and sweep circuitry on one board; the SE and SE/30 split them, with a separate metal-cased power supply module alongside a much smaller analogue board and a separate video board. Apple's exploded views give the same part numbers for all three modules in both machines: analogue board '''661-0371''', power supply '''661-0370''', video board '''982-0024'''.<ref name="ssse" /><ref name="ssse30" />
 
Thomas Lee puts the relationship precisely: on the SE and SE/30 the horizontal and video circuits are virtually identical to the Plus, but '''the vertical and power supply circuits are completely different'''.<ref name="cmrn" /> A capacitor list taken from a Plus will not match an SE.
 
The bare analogue board is marked '''630-0147'''. Console5 lists twelve electrolytics on it.<ref name="c5147" />


<templatestyles src="Template:StyledTable/styles.css" />
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:80%; text-align:center;"
|+ '''Macintosh SE / SE/30 analogue board 630-0147'''
|-
! Reference !! Capacitance !! Voltage !! Notes
|-
| C2 || 100 µF || 16 V ||
|-
| C7 || 100 µF || 16 V ||
|-
| C9 || 1000 µF || 16 V ||
|-
| C11 || 33 µF || 16 V ||
|-
| C13 || 220 µF || 16 V ||
|-
| C14 || 4700 µF || 16 V ||
|-
| C15 || 3.9 µF || 35 V || '''Bipolar (non-polarised), low ESR.''' See below.
|-
| C18 || 22 µF || 50 V ||
|-
| C19 || 10 µF || 160 V ||
|-
| C22 || 100 µF || 16 V ||
|-
| C24 || 220 µF || 16 V ||
|-
| C25 || 100 µF || 16 V ||
|}
=== C15 is not an ordinary capacitor ===
C15 is the high-frequency, non-polarised capacitor in the '''horizontal''' sweep circuit, and it is the single most commonly failed part on this board. Larry Pina specifies it as 3.9&nbsp;µF NP 25/35&nbsp;V HF and recommends fitting a '''3.9&nbsp;µF NP 100&nbsp;V HF''' part instead, to stop the fault returning.<ref name="dms" /> Console5 likewise flags the position as bipolar, low-ESR.<ref name="c5147" /> Do not fit an ordinary polarised electrolytic here.
Its failure sequence, from Pina:<ref name="dms" />
# Poor horizontal linearity — items on the left wider than items on the right.
# A vertical line on the right of the display a few minutes after startup, with diagonal lines; if left on, the picture darkens and the machine starts to smoke.
# Finally, a bright '''vertical''' line instead of a picture, again with smoke if left powered.
Check the yoke plug '''P1''' at the same time; Pina notes it is often burned by the time C15 has failed.
== Power Supply ==
The power supply is a separate module (Apple '''661-0370'''), and three different units were fitted. Identify yours from the label before ordering anything. Console5 publishes a list for each.<ref name="c5se" />
{| class="wikitable styled-table" style="width:100%; text-align:center;"
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Macintosh SE Analog Board Capacitor Specifications'''
|+ '''Power supply: Sony CR-44M'''
|-
! Reference !! Capacitance !! Voltage
|-
| C162 || 620 µF || 400 V
|-
| C164 || 4.7 µF || 350 V
|-
| C165 || 4.7 µF || 350 V
|-
| C168 || 100 µF || 16 V
|-
| C257 || 4700 µF || 16 V
|-
| C258 || 6800 µF || 10 V
|-
| C259 || 470 µF || 16 V
|-
| C261 || 2200 µF || 16 V
|-
| C262 || 3300 µF || 10 V
|-
| C263 || 2200 µF || 16 V
|-
|-
! Label !! Capacitance !! Voltage !! Quantity
| C264 || 470 µF || 16 V
|-
|-
| C1 || 3.9µF || 35V || 1x
| C265 || 47 µF || 25 V
|-
|-
| C2 || 4700µF || 16V || 1x
| C266 || 2200 µF || 16 V
|-
|-
| C3 || 220µF || 16V || 2x
| C269 || 1 µF || 50 V
|-
|-
| C5 || 47µF || 10V || 1x
| C270 || 22 µF || 25 V
|-
|-
| C6 || 22µF || 50V || 2x
| C275 || 22 µF || 25 V
|-
|-
| C10 || 33µF || 16V || 2x
| C276 || 22 µF || 25 V
|-
| C279 || 470 µF || 16 V
|}
 
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Power supply: Apple 820-0385-A / Hitachi'''
|-
|-
| C11 || 10µF || 160V || 1x
! Reference !! Capacitance !! Voltage
|-
|-
| C12 || 22µF || 50V || 2x
| C101 || 10 µF || 25 V
|-
|-
| C18 || 33µF || 16V || 2x
| C102 || 10 µF || 25 V
|-
|-
| C24 || 2200µF || 16V || 4x
| C206 || 620 µF || 400 V
|-
|-
| C27 || 2200µF || 16V || 1x
| C304 || 10 µF || 25 V
|-
|-
| C28 || 1000µF || 16V || 1x
| C305 || 1000 µF || 25 V
|-
|-
| C30 || 2200µF || 16V || 1x
| C306 || 470 µF || 16 V
|-
|-
| C31 || 220µF || 16V || 1x
| C307 || 1000 µF || 10 V
|-
|-
| C32 || 2200µF || 16V || 1x
| C308 || 4700 µF || 10 V
|-
|-
| C33 || 4700pF || 250V || 2x
| C309 || 1000 µF || 16 V
|-
|-
| C34 || 100µF || 200V || 4x
| C310 || 1000 µF || 16 V
|-
|-
| C35 || 100µF || 200V || 1x
| C311 || 470 µF || 16 V
|-
|-
| C36 || 4700pF || 250V || 1x
| C312 || 470 µF || 16 V
|-
|-
| C37 || 0.47µF || 250V || 1x
| C401 || 100 µF || 25 V
|-
|-
| C38 || 100µF || 200V || 1x
| C402 || 10 µF || 25 V
|-
|-
| C39 || 100µF || 200V || 1x
| C404 || 22 µF || 16 V
|-
|-
| C42 || 470µF || 10V || 2x
| C408 || 10 µF || 25 V
|-
|-
| C45 || 470µF || 10V || 1x
| C412 || 100 µF || 10 V
|}
|}


=== 💾 Logic Board Capacitors ===
{| class="wikitable styled-table" style="width:100%; text-align:center;"
The Macintosh SE logic board contains only a few electrolytic capacitors but they are vital to system operation.
|+ '''Power supply: Apple 699-5047 / ASTEC AA13800'''
|-
! Reference !! Capacitance !! Voltage
|-
| C7 || 330 µF || 200 V
|-
| C8 || 330 µF || 200 V
|-
| C19 || 220 µF || 25 V
|-
| C21 || 47 µF || 63 V
|-
| C23 or C25 || 470 µF || 16 V
|-
| C24 || 1200 µF || 10 V
|-
| C25 or C28 || 220 µF || 16 V
|-
| C31 || 2200 µF || 16 V
|-
| C32 || 47 µF || 25 V
|-
| C35 || 470 µF || 16 V
|-
| C36 || 1200 µF || 10 V
|}
 
Console5 notes that some — not all — ASTEC supplies were built with three 4700&nbsp;pF metallised-paper RIFA Y-class safety capacitors, and that these should always be replaced when found.<ref name="c5se" /> The ambiguous designators in that last table ("C23 or C25", "C25 or C28") are reproduced as published; check your own board's silkscreen.
 
Note the primary-side ratings: 620&nbsp;µF 400&nbsp;V in the Sony and Hitachi units, and a series pair of 330&nbsp;µF 200&nbsp;V in the ASTEC. Those parts sit at rectified mains potential and hold charge after power-off.
 
=== There is no voltage adjustment ===


<templatestyles src="Template:StyledTable/styles.css" />
Apple's Service Source for this machine contains Yoke and Video adjustment procedures and '''nothing else''' — no voltage adjustment, and no rail tolerances.<ref name="APPLESS" /> The adjustable trimmer R56 belongs to the Macintosh 128K/512K/Plus power/sweep board, which is a different board in a different machine;<ref name="cmrn" /> there is no equivalent control here. The video controls on the SE and SE/30 analogue board are brightness, width, height and focus.<ref name="APPLESS" />
{| class="wikitable styled-table" style="width:100%; text-align:center;"
 
|+ '''Macintosh SE Logic Board Capacitor Specifications'''
If the rails are out of specification on one of these machines, the supply module is at fault and needs repair or replacement — there is nothing to turn.
 
== Analogue Board Faults by Component ==
 
Larry Pina's ''The Dead Mac Scrolls'' documents the analogue-board faults of the SE and SE/30 down to individual components, with exact replacement specifications. It is hosted on this wiki.<ref name="dms" />
 
{| class="wikitable styled-table" style="width:100%;"
|-
! Symptom !! Component !! Specification
|-
| No chime, dark display, a dreadful hissing or sizzling noise || '''CR2''' shorted (0.00–0.01&nbsp;Ω) || Barrel rectifier GI854, R-51, 600&nbsp;V 3&nbsp;A. Pina suggests an MR824 (R-51, 400&nbsp;V, 5&nbsp;A) as a heavier-duty replacement.
|-
| No chime, dark display, apparently completely dead, '''no''' hissing noise || '''CR3''' shorted; then '''Q2''' burned; then flyback '''T2''' || CR3 is the same GI854 barrel rectifier. Q2 is the BU4060 horizontal output transistor.
|-
| Right side of the picture shakes in and out during disk access or when a window opens || '''CR2''', then '''Q2''' || As above
|-
|-
! Label !! Capacitance !! Voltage !! Quantity
| Chimes, fan turns, hard disk spins, but the display stays dark and the brightness control does nothing || '''R22''' open || 470&nbsp;kΩ, ½&nbsp;W, 5&nbsp;%
|-
|-
| C6 || 1µF || 50V || 1x
| Chimes, then a relatively dim '''vertical''' line || '''R19''' burned || 220&nbsp;Ω, ½&nbsp;W, 5&nbsp;%. Vacuum-desolder and resolder linearity coil '''L3''' with fresh solder, or it will recur.
|-
|-
| C1, C3, C4, C5, C7, C8, C9, C10, C12, C13 || 33µF || 10V || 10x
| Poor horizontal linearity, then a bright '''vertical''' line and smoke || '''C15''', and yoke plug '''P1''' || 3.9&nbsp;µF NP 25/35&nbsp;V HF; fit 3.9&nbsp;µF NP 100&nbsp;V HF
|}
|}
[[File:Macintosh SE Logic Board Capacitors.jpg|thumb|Macintosh SE Logic Board Capacitor Locations|center|535x535px]]


> '''Note''': Labeling may differ slightly across board revisions. Double-check values before replacing.
Two of those deserve emphasis. A '''single vertical line''' is a collapse of the '''horizontal''' sweep and points at C15, R19, L3 or the yoke plug. A '''single horizontal line''' is a collapse of the '''vertical''' sweep — a different circuit, built around the TDA1170 vertical deflection IC that Apple adopted on the compact Macs after the Plus.<ref name="cmrn" /> Either way, switch the machine off immediately: a concentrated line will burn the phosphor in minutes.


== 🛠️ Capacitor Replacement Procedure ==
== Capacitor Replacement Procedure ==


# '''Discharge CRT''' – Always discharge the CRT before any internal work to prevent injury.
# '''Discharge the CRT''' — see [[CRT Discharge Procedure]].
# '''Disassemble''' – Remove the case, analog board, and logic board. Label cables if necessary.
# '''Remove the battery''' from the logic board before cleaning or reworking it.
# '''Remove Capacitors''' – Desolder cleanly using a pump or braid. Avoid damaging traces.
# '''Confirm the primary-side capacitors in the power supply are discharged''' before opening it.
# '''Install Replacements''' – Observe '''polarity markings'''. Most electrolytics are polarized.
# '''Photograph each board''' before removing anything.
# '''Solder Carefully''' – Apply clean, even solder joints. Trim excess leads.
# '''Desolder''' with a temperature-controlled iron and wick or a pump.
# '''Inspect & Test''' – Use a multimeter to test continuity and check for accidental shorts.
# '''Clean the pads''' and check for corrosion underneath each old part.
# '''Power Up Carefully''' – Apply power while monitoring voltages and behavior.
# '''Fit the new parts''' the right way round — stripe to negative. '''C15 on the analogue board is non-polarised.'''
# '''Inspect''' under magnification for bridges and cold joints.
# '''Check for shorts''' across each rail before applying power.


== 🧰 Recommended Tools ==
Tools are listed on [[Recommended Tools]].


* '''Temperature-controlled soldering iron (fine tip)'''
== Module Part Numbers ==
* '''Desoldering pump or braid'''
* '''Multimeter with continuity/ESR testing'''
* '''Isopropyl alcohol (99%) and antistatic brush'''
* '''Lead-free or leaded 0.5 mm solder'''
* '''Protective eyewear and insulated gloves'''


== ⚙️ Voltage Adjustment After Recap ==
From Apple's exploded view for the Macintosh SE:<ref name="APPLESS" />


After reassembly, verify voltage rails at the floppy drive power plug:
* Analogue board — '''661-0371''' (shared with the SE/30)
* Power supply — '''661-0370''' (shared with the SE/30)
* Video board — '''982-0024''' (shared with the SE/30)
* Logic board — '''661-0530'''
* CRT and yoke assembly — 076-0103
* Chassis — 805-0938


* '''+5V Rail:''' 4.85V – 5.15V
== Choosing Replacements ==
* '''+12V Rail:''' 11.9V – 12.7V


Use the analog board trimmer potentiometer ('''R56''') to fine-tune if necessary.
* 105&nbsp;°C-rated parts from a known manufacturer for anything in the power supply or on the analogue board.
* Match or exceed the rating printed on the part you removed.
* Never substitute a polarised part for C15.
* Replace metallised-paper (RIFA) safety capacitors on sight.<ref name="c5se" />


== 💡 Additional Tips ==
== Component-level sources held on this wiki ==


* Power up the SE at least once every few months to keep capacitors healthy.
Apple's own [[Macintosh SE Service Source]] is '''module level''': the analogue board and power supply are one replaceable assembly, and the volume carries '''no parts list and no component values'''. It also confirms there is '''no voltage adjustment''' on this machine — its Adjustments chapter is Yoke and Video only — and gives the battery threshold as '''replace below 2.8&nbsp;V''', measured with the cover off, the CRT discharged and the logic board removed.<ref name="ssse126">Apple Computer, ''Macintosh SE'' Service Source, 126 pp, PDF distilled 13 December 1995. Hosted here as [[Macintosh SE Service Source]] ([[:File:Macintosh_SE.pdf]]). Specifications — Electrical; Additional Procedures — Battery Verification; Adjustments.</ref>
* Use high-quality brands (e.g., Nichicon, Panasonic, Rubycon).
* Double-check polarity before soldering any capacitor.
* Clean the board of any capacitor residue using alcohol after desoldering.
* Dispose of old capacitors at an approved electronics waste center.


== 🔗 Related Pages ==
Component-level data for this machine is in Larry Pina's 1990 book, held here as [[Macintosh Repair & Upgrade Secrets]], which devotes chapter 14 to SE repair and prints two parts lists for it: '''Appendix E''', the Macintosh SE analogue board, and '''Appendix F''', the '''SE CRT socket board''' — the smaller board on the neck of the tube, which no other source here enumerates. Appendix E also identifies the tube as a '''Samsung type 10ATY4N white antiglare''' CRT.<ref name="pina90">Larry Pina, ''Macintosh Repair & Upgrade Secrets'', Hayden Books (Macmillan), first edition second printing 1990, ISBN 0-672-48452-8. Hosted here as [[Macintosh Repair & Upgrade Secrets]] ([[:File:Macintosh Repair & Upgrade Secrets.pdf]]). Appendix C is the parts list for the '''U.S. version''' of the Macintosh analogue board (p. 327), Appendix D the '''International version''' (p. 335), Appendix E the Macintosh SE analogue board (p. 341) and Appendix F the SE CRT socket board (p. 345). Each list gives reference, capacitance, working voltage, working temperature, package type and original manufacturer. Secondary source, but component-level and independent of Console5.</ref>
 
== Related Pages ==
 
* [[Macintosh Repair & Upgrade Secrets]]
* [[The Dead Mac Scrolls]] — chapter 2 covers the SE and SE/30
* [[Macintosh SE Service Source]]
* [[Macintosh SE]]
* [[Macintosh SE Troubleshooting]]
* [[Macintosh SE Troubleshooting]]
* [[Macintosh SE General Maintenance]]
* [[Macintosh SE General Maintenance]]
* [[Macintosh SE/30 Capacitor Replacement Guide]]
* [[Battery Explosion, Capacitor or Corrosion Damage]]
* [[Capacitor Failure Symptoms]]
* [[CRT Discharge Procedure]]
* [[CRT Discharge Procedure]]
* [[Recommended Tools]]
== References ==
<references>
<ref name="APPLESS">Apple Computer, ''Macintosh SE Service Source'', hosted here as [[:File:Macintosh_SE.pdf]]. Specifications (Electrical, PRAM), Additional Procedures — Battery Verification, Adjustments (Yoke and Video only) and the Exploded View parts list. Apple's Service Source is module-level: it gives procedures, thresholds and field-replaceable-unit numbers, not component values.</ref>
<ref name="ssse">Apple Computer, ''Macintosh SE Service Source'', Exploded View — analogue board 661-0371, power supply 661-0370, video board 982-0024. [[:File:Macintosh_SE.pdf]]</ref>
<ref name="ssse30">Apple Computer, ''Macintosh SE/30 Service Source'', Exploded View — the same three module part numbers. [[:File:Macintosh SE30.pdf]]</ref>
<ref name="c5se">Console5 TechWiki, "Macintosh SE" — logic board 820-0176 / 820-0250, analogue board 630-0147, and the three power supply variants (Sony CR-44M, Apple 820-0385-A / Hitachi, Apple 699-5047 / ASTEC AA13800). https://wiki.console5.com/wiki/Macintosh_SE Secondary source — vendor cap-kit lists, not Apple documentation.</ref>
<ref name="c5147">Console5 TechWiki, "Mac Analog Board: 630-0147". https://wiki.console5.com/wiki/Mac_Analog_Board:_630-0147 Secondary source.</ref>
<ref name="recapse">Bruce / Recap-a-Mac, "Macintosh SE". https://recapamac.com.au/macintosh-se/ Logic board capacitor count from a photographic recapping guide, and the observation that the SE's axial electrolytics are not prone to the leakage seen in later surface-mount Macs. Secondary source.</ref>
<ref name="dms">Larry Pina, ''The Dead Mac Scrolls'' (1992), hosted here as [[:File:The Dead Mac Scrolls 1992.pdf]], "Mac SE and SE/30" section. Symptom-to-component diagnoses with exact part specifications.</ref>
<ref name="cmrn">Thomas H. Lee, ''Classic Mac Repair Notes'', revision of 31 May 2007 (©2000 Thomas H. Lee, all rights reserved; not re-hosted here for that reason). https://archive.org/details/Classic_Mac_Repair_Notes Section 1.0 on which circuits the SE and SE/30 share with the Plus, and section 7.3 on the TDA1170 vertical deflection IC used in the compact Macs after the Plus.</ref>
</references>


[[Category:Apple Vintage Computers]]
[[Category:Apple Vintage Computers]]
[[Category:Apple Maintenance Guides]]
[[Category:Capacitor Replacement Guides]]
[[Category: Capacitor Replacement Guides]]

Latest revision as of 08:48, 25 September 2026

The Macintosh SE logic board is not one of the Macs that leaks. Its capacitors are the older axial type rather than the surface-mount parts that destroy SE/30, Classic and Classic II boards, and Recap-a-Mac — which has recapped a great many compact Macs — says the SE very rarely needs recapping at all.[1] The parts that do need attention are the on-board lithium battery, the analogue board and the power supply.

Safety

[edit | edit source]

Do the Battery First

[edit | edit source]

The SE keeps PRAM alive with a soldered 1/2 AA lithium cell, which Apple describes as a "seven-year lithium battery".[3] It is now several times that age. Apple's own verification procedure is to remove the logic board, measure across the cell on the 10 V DC range, and replace it if it reads below 2.8 V.[3]

A leaking cell will take traces with it. See Battery Explosion, Capacitor or Corrosion Damage.

Capacitor Inspection

[edit | edit source]
  • Bulging tops — a healthy capacitor has a flat top.
  • Leaking electrolyte — brown or white crust at the leads.
  • Corrosion or board staining near the base of a capacitor.

An ESR meter is more use than a capacitance meter here: these parts usually fail by drying out and going high-ESR rather than by losing capacitance. See Capacitor Failure Symptoms.

Logic Board

[edit | edit source]

The SE logic board — Apple part 820-0176 or 820-0250 depending on revision — carries eleven electrolytic capacitors.[2]

Macintosh SE logic board 820-0176 / 820-0250
Reference Capacitance Voltage
C4 33 µF 16 V
C11 33 µF 16 V
C13 33 µF 16 V
C16 33 µF 16 V
C32 33 µF 16 V
C34 33 µF 16 V
C36 1 µF 50 V
C37 33 µF 16 V
C38 33 µF 16 V
C62 33 µF 16 V
C86 33 µF 16 V

Two independent sources agree on the totals: Console5 lists the ten 33 µF 16 V positions and one 1 µF 50 V position above,[2] and Recap-a-Mac's photographic guide, made from a physical SE board, counts exactly 10 × 33 µF 16 V and 1 × 1 µF 50 V.[1]

Macintosh SE logic board capacitor locations

Analogue Board

[edit | edit source]

The SE and SE/30 do not use the Macintosh Plus power/sweep board. The Plus combines supply and sweep circuitry on one board; the SE and SE/30 split them, with a separate metal-cased power supply module alongside a much smaller analogue board and a separate video board. Apple's exploded views give the same part numbers for all three modules in both machines: analogue board 661-0371, power supply 661-0370, video board 982-0024.[4][5]

Thomas Lee puts the relationship precisely: on the SE and SE/30 the horizontal and video circuits are virtually identical to the Plus, but the vertical and power supply circuits are completely different.[6] A capacitor list taken from a Plus will not match an SE.

The bare analogue board is marked 630-0147. Console5 lists twelve electrolytics on it.[7]

Macintosh SE / SE/30 analogue board 630-0147
Reference Capacitance Voltage Notes
C2 100 µF 16 V
C7 100 µF 16 V
C9 1000 µF 16 V
C11 33 µF 16 V
C13 220 µF 16 V
C14 4700 µF 16 V
C15 3.9 µF 35 V Bipolar (non-polarised), low ESR. See below.
C18 22 µF 50 V
C19 10 µF 160 V
C22 100 µF 16 V
C24 220 µF 16 V
C25 100 µF 16 V

C15 is not an ordinary capacitor

[edit | edit source]

C15 is the high-frequency, non-polarised capacitor in the horizontal sweep circuit, and it is the single most commonly failed part on this board. Larry Pina specifies it as 3.9 µF NP 25/35 V HF and recommends fitting a 3.9 µF NP 100 V HF part instead, to stop the fault returning.[8] Console5 likewise flags the position as bipolar, low-ESR.[7] Do not fit an ordinary polarised electrolytic here.

Its failure sequence, from Pina:[8]

  1. Poor horizontal linearity — items on the left wider than items on the right.
  2. A vertical line on the right of the display a few minutes after startup, with diagonal lines; if left on, the picture darkens and the machine starts to smoke.
  3. Finally, a bright vertical line instead of a picture, again with smoke if left powered.

Check the yoke plug P1 at the same time; Pina notes it is often burned by the time C15 has failed.

Power Supply

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The power supply is a separate module (Apple 661-0370), and three different units were fitted. Identify yours from the label before ordering anything. Console5 publishes a list for each.[2]

Power supply: Sony CR-44M
Reference Capacitance Voltage
C162 620 µF 400 V
C164 4.7 µF 350 V
C165 4.7 µF 350 V
C168 100 µF 16 V
C257 4700 µF 16 V
C258 6800 µF 10 V
C259 470 µF 16 V
C261 2200 µF 16 V
C262 3300 µF 10 V
C263 2200 µF 16 V
C264 470 µF 16 V
C265 47 µF 25 V
C266 2200 µF 16 V
C269 1 µF 50 V
C270 22 µF 25 V
C275 22 µF 25 V
C276 22 µF 25 V
C279 470 µF 16 V
Power supply: Apple 820-0385-A / Hitachi
Reference Capacitance Voltage
C101 10 µF 25 V
C102 10 µF 25 V
C206 620 µF 400 V
C304 10 µF 25 V
C305 1000 µF 25 V
C306 470 µF 16 V
C307 1000 µF 10 V
C308 4700 µF 10 V
C309 1000 µF 16 V
C310 1000 µF 16 V
C311 470 µF 16 V
C312 470 µF 16 V
C401 100 µF 25 V
C402 10 µF 25 V
C404 22 µF 16 V
C408 10 µF 25 V
C412 100 µF 10 V
Power supply: Apple 699-5047 / ASTEC AA13800
Reference Capacitance Voltage
C7 330 µF 200 V
C8 330 µF 200 V
C19 220 µF 25 V
C21 47 µF 63 V
C23 or C25 470 µF 16 V
C24 1200 µF 10 V
C25 or C28 220 µF 16 V
C31 2200 µF 16 V
C32 47 µF 25 V
C35 470 µF 16 V
C36 1200 µF 10 V

Console5 notes that some — not all — ASTEC supplies were built with three 4700 pF metallised-paper RIFA Y-class safety capacitors, and that these should always be replaced when found.[2] The ambiguous designators in that last table ("C23 or C25", "C25 or C28") are reproduced as published; check your own board's silkscreen.

Note the primary-side ratings: 620 µF 400 V in the Sony and Hitachi units, and a series pair of 330 µF 200 V in the ASTEC. Those parts sit at rectified mains potential and hold charge after power-off.

There is no voltage adjustment

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Apple's Service Source for this machine contains Yoke and Video adjustment procedures and nothing else — no voltage adjustment, and no rail tolerances.[3] The adjustable trimmer R56 belongs to the Macintosh 128K/512K/Plus power/sweep board, which is a different board in a different machine;[6] there is no equivalent control here. The video controls on the SE and SE/30 analogue board are brightness, width, height and focus.[3]

If the rails are out of specification on one of these machines, the supply module is at fault and needs repair or replacement — there is nothing to turn.

Analogue Board Faults by Component

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Larry Pina's The Dead Mac Scrolls documents the analogue-board faults of the SE and SE/30 down to individual components, with exact replacement specifications. It is hosted on this wiki.[8]

Symptom Component Specification
No chime, dark display, a dreadful hissing or sizzling noise CR2 shorted (0.00–0.01 Ω) Barrel rectifier GI854, R-51, 600 V 3 A. Pina suggests an MR824 (R-51, 400 V, 5 A) as a heavier-duty replacement.
No chime, dark display, apparently completely dead, no hissing noise CR3 shorted; then Q2 burned; then flyback T2 CR3 is the same GI854 barrel rectifier. Q2 is the BU4060 horizontal output transistor.
Right side of the picture shakes in and out during disk access or when a window opens CR2, then Q2 As above
Chimes, fan turns, hard disk spins, but the display stays dark and the brightness control does nothing R22 open 470 kΩ, ½ W, 5 %
Chimes, then a relatively dim vertical line R19 burned 220 Ω, ½ W, 5 %. Vacuum-desolder and resolder linearity coil L3 with fresh solder, or it will recur.
Poor horizontal linearity, then a bright vertical line and smoke C15, and yoke plug P1 3.9 µF NP 25/35 V HF; fit 3.9 µF NP 100 V HF

Two of those deserve emphasis. A single vertical line is a collapse of the horizontal sweep and points at C15, R19, L3 or the yoke plug. A single horizontal line is a collapse of the vertical sweep — a different circuit, built around the TDA1170 vertical deflection IC that Apple adopted on the compact Macs after the Plus.[6] Either way, switch the machine off immediately: a concentrated line will burn the phosphor in minutes.

Capacitor Replacement Procedure

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  1. Discharge the CRT — see CRT Discharge Procedure.
  2. Remove the battery from the logic board before cleaning or reworking it.
  3. Confirm the primary-side capacitors in the power supply are discharged before opening it.
  4. Photograph each board before removing anything.
  5. Desolder with a temperature-controlled iron and wick or a pump.
  6. Clean the pads and check for corrosion underneath each old part.
  7. Fit the new parts the right way round — stripe to negative. C15 on the analogue board is non-polarised.
  8. Inspect under magnification for bridges and cold joints.
  9. Check for shorts across each rail before applying power.

Tools are listed on Recommended Tools.

Module Part Numbers

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From Apple's exploded view for the Macintosh SE:[3]

  • Analogue board — 661-0371 (shared with the SE/30)
  • Power supply — 661-0370 (shared with the SE/30)
  • Video board — 982-0024 (shared with the SE/30)
  • Logic board — 661-0530
  • CRT and yoke assembly — 076-0103
  • Chassis — 805-0938

Choosing Replacements

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  • 105 °C-rated parts from a known manufacturer for anything in the power supply or on the analogue board.
  • Match or exceed the rating printed on the part you removed.
  • Never substitute a polarised part for C15.
  • Replace metallised-paper (RIFA) safety capacitors on sight.[2]

Component-level sources held on this wiki

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Apple's own Macintosh SE Service Source is module level: the analogue board and power supply are one replaceable assembly, and the volume carries no parts list and no component values. It also confirms there is no voltage adjustment on this machine — its Adjustments chapter is Yoke and Video only — and gives the battery threshold as replace below 2.8 V, measured with the cover off, the CRT discharged and the logic board removed.[9]

Component-level data for this machine is in Larry Pina's 1990 book, held here as Macintosh Repair & Upgrade Secrets, which devotes chapter 14 to SE repair and prints two parts lists for it: Appendix E, the Macintosh SE analogue board, and Appendix F, the SE CRT socket board — the smaller board on the neck of the tube, which no other source here enumerates. Appendix E also identifies the tube as a Samsung type 10ATY4N white antiglare CRT.[10]

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References

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  1. ↑ 1.0 1.1 Bruce / Recap-a-Mac, "Macintosh SE". https://recapamac.com.au/macintosh-se/ Logic board capacitor count from a photographic recapping guide, and the observation that the SE's axial electrolytics are not prone to the leakage seen in later surface-mount Macs. Secondary source.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Console5 TechWiki, "Macintosh SE" — logic board 820-0176 / 820-0250, analogue board 630-0147, and the three power supply variants (Sony CR-44M, Apple 820-0385-A / Hitachi, Apple 699-5047 / ASTEC AA13800). https://wiki.console5.com/wiki/Macintosh_SE Secondary source — vendor cap-kit lists, not Apple documentation.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Apple Computer, Macintosh SE Service Source, hosted here as File:Macintosh_SE.pdf. Specifications (Electrical, PRAM), Additional Procedures — Battery Verification, Adjustments (Yoke and Video only) and the Exploded View parts list. Apple's Service Source is module-level: it gives procedures, thresholds and field-replaceable-unit numbers, not component values.
  4. ↑ Apple Computer, Macintosh SE Service Source, Exploded View — analogue board 661-0371, power supply 661-0370, video board 982-0024. File:Macintosh_SE.pdf
  5. ↑ Apple Computer, Macintosh SE/30 Service Source, Exploded View — the same three module part numbers. File:Macintosh SE30.pdf
  6. ↑ 6.0 6.1 6.2 Thomas H. Lee, Classic Mac Repair Notes, revision of 31 May 2007 (©2000 Thomas H. Lee, all rights reserved; not re-hosted here for that reason). https://archive.org/details/Classic_Mac_Repair_Notes Section 1.0 on which circuits the SE and SE/30 share with the Plus, and section 7.3 on the TDA1170 vertical deflection IC used in the compact Macs after the Plus.
  7. ↑ 7.0 7.1 Console5 TechWiki, "Mac Analog Board: 630-0147". https://wiki.console5.com/wiki/Mac_Analog_Board:_630-0147 Secondary source.
  8. ↑ 8.0 8.1 8.2 Larry Pina, The Dead Mac Scrolls (1992), hosted here as File:The Dead Mac Scrolls 1992.pdf, "Mac SE and SE/30" section. Symptom-to-component diagnoses with exact part specifications.
  9. ↑ Apple Computer, Macintosh SE Service Source, 126 pp, PDF distilled 13 December 1995. Hosted here as Macintosh SE Service Source (File:Macintosh_SE.pdf). Specifications — Electrical; Additional Procedures — Battery Verification; Adjustments.
  10. ↑ Larry Pina, Macintosh Repair & Upgrade Secrets, Hayden Books (Macmillan), first edition second printing 1990, ISBN 0-672-48452-8. Hosted here as Macintosh Repair & Upgrade Secrets (File:Macintosh Repair & Upgrade Secrets.pdf). Appendix C is the parts list for the U.S. version of the Macintosh analogue board (p. 327), Appendix D the International version (p. 335), Appendix E the Macintosh SE analogue board (p. 341) and Appendix F the SE CRT socket board (p. 345). Each list gives reference, capacitance, working voltage, working temperature, package type and original manufacturer. Secondary source, but component-level and independent of Console5.
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