Editing Apple Lisa Troubleshooting

Troubleshooting is essential for diagnosing and resolving issues with your '''Apple Lisa'''. This guide covers the most common problems encountered with Lisa systems.

== Preliminary Checks ==

Before detailed troubleshooting:
* Verify power outlet is working
* Check that all cables are properly connected
* Ensure the power supply voltage selector (if present) is set correctly for your region
* Allow adequate time for capacitor discharge before internal work (24+ hours)

== No Power / Dead System ==

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[[File:Apple Lisa (photo).jpg|thumb|right|300px|Apple Lisa. Source: Wikimedia Commons.]]
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''No Power Diagnostics'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| No response when power switched on || Failed RIFA safety capacitors || Inspect and replace RIFA capacitors in power supply
|-
| Clicking or ticking from power supply || Power supply overload or short || Check for shorts on motherboard; replace power supply capacitors
|-
| Trips circuit breaker || Shorted RIFA capacitor || Replace all RIFA safety capacitors immediately
|-
| Power supply smokes || RIFA capacitor failure || Disconnect immediately; replace all safety capacitors
|-
| Intermittent power || Failing electrolytic capacitors || Full power supply recap recommended
|-
| Powers on briefly then shuts off || Power supply protection circuit triggering || Check for shorts; verify output voltages
|}

=== RIFA Capacitor Failure ===
RIFA-brand safety capacitors are the most common cause of Lisa power problems:
* These capacitors absorb moisture over decades and fail catastrophically
* They may emit smoke, loud pops, or acrid smell when failing
* ALWAYS replace preventatively before powering on a long-stored Lisa
* Replace with modern X2-rated capacitors of equivalent value

== Self-Test Error Codes ==

The Lisa displays error codes during its self-test sequence:

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Common Lisa Error Codes'''
|-
! Error Code !! Component !! Description
|-
| 10-19 || CPU Board || CPU board failure; check RAM, ROM, or processor
|-
| 20-29 || I/O Board || I/O board error; check IWM, serial ports, or ROM
|-
| 57 || Disk Controller || Disk controller failure on I/O or CPU board
|-
| 70-79 || Memory || Memory card error (icon shows affected slot: MEM1 or MEM2)
|-
| 80-89 || Storage || Hard drive or floppy drive error
|-
| 82 || Widget || Generic Widget drive failure
|}

=== Error 57 (Disk Controller) ===
* Reseat all socketed chips on the I/O board
* Check the IWM (Integrated Woz Machine) chip
* Verify I/O ROM is correct version (H/88 for Lisa 2/10)
* Inspect for cracked solder joints

=== Error 70 (Memory) ===
* The error icon shows which memory slot is affected (MEM1 or MEM2)
* Try each memory card individually
* Clean the edge connector contacts with isopropyl alcohol
* Individual RAM chip testing may be required

=== Error 82 (Widget) ===
* Generic Widget drive failure code
* Widget may require low-level format (no utility publicly available)
* Consider ProFile emulator (X/ProFile, IDEfile) as replacement
* Check Widget cable connections

== Video Problems ==

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Display Issues'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| No display, system runs || CRT failure or analog board issue || Check CRT connections; test analog board
|-
| Horizontal line only || Vertical deflection failure || Check vertical output IC and capacitors on analog board
|-
| Vertical line only || Horizontal deflection failure || Check horizontal output transistor and flyback
|-
| Image shifted horizontally || H-position adjustment needed || Adjust horizontal position potentiometer
|-
| Garbled/checkered display || Memory or video RAM issue || Test with known-good memory cards
|-
| Bright flash/line at shutdown || Normal CRT behavior || CRT discharge is expected at power-off
|-
| Dim or faded display || CRT aging or brightness adjustment || Adjust brightness; CRT may need replacement
|}

=== CRT Adjustments ===
* Horizontal and vertical position/size controls are on the analog board
* Focus adjustment may be on the flyback transformer
* Always discharge CRT before making adjustments

== Keyboard Problems ==

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Keyboard Issues'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| No keys working || Keyboard cable disconnected || Check cable connection to I/O board
|-
| Most keys not working || Deteriorated foam pads || Replace capacitive foam and foil pads
|-
| Some keys work, others don't || Individual pad failure || Replace foam/foil on affected keys
|-
| Keyboard error on boot || Keyboard not detected || Check cable; verify keyboard controller chip
|}

=== Foam Pad Replacement ===
The Lisa keyboard uses capacitive foam pads that deteriorate with age:
* Purchase Lisa keyboard foam/foil replacement kit
* Each key requires a new foam pad and conductive foil
* This is the most common Lisa keyboard repair

== Floppy Drive Problems ==

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{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Floppy Drive Issues'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| Drive won't accept disk || Seized eject mechanism || Clean and lubricate mechanism with isopropyl alcohol
|-
| No disk spinning || Motor or motor controller failure || Check TA7259 motor IC; may require spindle repair
|-
| Read errors || Dirty heads or alignment || Clean heads; check for alignment issues
|-
| Intermittent reads || Failing capacitors near drive controller || Check/replace associated capacitors
|}

=== Floppy Emu Compatibility ===
* FloppyEmu can be used with Lisa systems
* Requires appropriate cable adapter
* External connection may require modification

== Widget Drive Problems ==

The Widget (internal hard drive in Lisa 2/10) has known reliability issues:

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+ '''Widget Issues'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| Widget not recognized || Cable connection or controller failure || Check cables; verify controller on I/O board
|-
| Error 82 on boot || Generic Widget failure || Drive may need replacement with ProFile emulator
|-
| Widget spins but won't boot || Corrupted data or head issues || Attempt boot from floppy; consider drive replacement
|-
| Clicking sounds from Widget || Head or mechanism failure || Drive likely requires replacement
|}

=== ProFile Emulator Options ===
Modern alternatives to the Widget drive:
* '''X/ProFile''' — Drop-in Widget replacement using CompactFlash
* '''IDEfile''' — ProFile emulator using IDE drives
* Both provide higher reliability than original Widget drives

== ⚠️ The I/O-board battery pack — remove it now ==

The Lisa keeps its real-time clock alive with a '''4 × AA NiCd pack strapped to the bottom-right of the I/O board'''. These packs leak corrosive electrolyte and are the single most destructive Lisa fault &mdash; when they let go they can '''destroy the I/O board and the motherboard, and in rare cases the CPU and RAM boards'''. '''Remove the battery pack from any Lisa immediately''', and clean and repair any corrosion before powering up.<ref name="lisa">[https://lisafaq.sunder.net/single.html The Apple Lisa FAQ]; [https://tinkerdifferent.com/threads/lisa-2-repair-journey.1151/ Lisa 2 repair journey], TinkerDifferent; [https://www.classic-computers.org.nz/blog/2011-03-05-rejuvenating-a-lisa2-10.htm Rejuvenating an Apple Lisa 2/10], Tezza's Classic Computers; and the Apple Lisa Do-It-Yourself Guide. Source for the I/O-board battery-pack leakage, the PSU failure, the Twiggy-drive unreliability, and the boot-ROM error codes (40 = CPU/MMU, 57 = disk controller).</ref>

== Boot self-test and error codes ==

The Lisa boot ROM runs a self-test and, on a fault, shows a '''numeric error code''' and draws a '''cross (X) over the icon of the failing board'''. Useful codes:

* '''40''' — CPU-board / MMU fault (a failed MMU register test loops endlessly; the CRT goes blank once warm).
* '''57''' — disk-controller fault.

The card-based design makes diagnosis a matter of swapping the '''CPU, memory and I/O boards'''; almost everything is user-replaceable except the CRT and video board.<ref name="lisa">[https://lisafaq.sunder.net/single.html The Apple Lisa FAQ]; [https://tinkerdifferent.com/threads/lisa-2-repair-journey.1151/ Lisa 2 repair journey], TinkerDifferent; [https://www.classic-computers.org.nz/blog/2011-03-05-rejuvenating-a-lisa2-10.htm Rejuvenating an Apple Lisa 2/10], Tezza's Classic Computers; and the Apple Lisa Do-It-Yourself Guide. Source for the I/O-board battery-pack leakage, the PSU failure, the Twiggy-drive unreliability, and the boot-ROM error codes (40 = CPU/MMU, 57 = disk controller).</ref>

== Power supply ==

A Lisa that '''runs for a few minutes and then switches off''', or will not power on at all, has a failing power supply — a known weak point that should be serviced/recapped.<ref name="lisa">[https://lisafaq.sunder.net/single.html The Apple Lisa FAQ]; [https://tinkerdifferent.com/threads/lisa-2-repair-journey.1151/ Lisa 2 repair journey], TinkerDifferent; [https://www.classic-computers.org.nz/blog/2011-03-05-rejuvenating-a-lisa2-10.htm Rejuvenating an Apple Lisa 2/10], Tezza's Classic Computers; and the Apple Lisa Do-It-Yourself Guide. Source for the I/O-board battery-pack leakage, the PSU failure, the Twiggy-drive unreliability, and the boot-ROM error codes (40 = CPU/MMU, 57 = disk controller).</ref>

== Twiggy drives (Lisa 1) ==

The Lisa 1 used two Apple "Twiggy" 5.25-inch 860 KB drives, which were '''unreliable'''; most Lisa 1s were upgraded to the Lisa 2 with a Sony 400 KB 3.5-inch drive. Twiggy read errors and disk-boot failures are why so few Lisa 1s survive &mdash; a Lisa 2 conversion or a modern floppy emulator is the usual path.<ref name="lisa">[https://lisafaq.sunder.net/single.html The Apple Lisa FAQ]; [https://tinkerdifferent.com/threads/lisa-2-repair-journey.1151/ Lisa 2 repair journey], TinkerDifferent; [https://www.classic-computers.org.nz/blog/2011-03-05-rejuvenating-a-lisa2-10.htm Rejuvenating an Apple Lisa 2/10], Tezza's Classic Computers; and the Apple Lisa Do-It-Yourself Guide. Source for the I/O-board battery-pack leakage, the PSU failure, the Twiggy-drive unreliability, and the boot-ROM error codes (40 = CPU/MMU, 57 = disk controller).</ref>

== References ==

<references />

== Related Pages ==
* [[Apple Lisa]]
* [[Apple Lisa General Maintenance]]
* [[Apple Lisa Capacitor Replacement Guide]]
* [[CRT Discharge Procedure]]

[[Category:Apple Vintage Computers]]
[[Category:Apple Troubleshooting Guides]]