Recap guide

Recap the 3DO

Early FZ-1 units have leaky caps near the power supply and CD-ROM drive board that can cause reboots, bad audio and disc read errors.

Open the interactive checklist Tick off each capacitor as you replace it. It saves in your browser.

Worth a recap. Reports say it is a common and useful fix on this machine.

Which board do I have?

Boards changed during production. These notes come from the linked sources, and many are only partly documented, so check the board in front of you.

Panasonic FZ-1 matte top (1993-1994) (Medium confidence). How to tell: Rough-textured matte top shell with active cooling; motherboards typically DFUP0576ZAM 2(a) or 3(a). Capacitors: ConsoleMods says capacitor types and counts vary across motherboard revisions; no per-board list found. Capacitor list differs from other revisions: yes. Source
Panasonic FZ-1 shiny top (Medium confidence). How to tell: Smooth gravel-textured shiny top with passive cooling; motherboards typically DFUP0648ZAM (a) or DFUP0649ZAM 3(a). Capacitors: A Retro Repairs log on a 1994 FZ-1 DFUP0648ZA M(a) says it has up to 26 through-hole electrolytics and found C35 (1000 uF 6.3V) leaking, and says production variants differ. Capacitor list differs from other revisions: yes. Source
GoldStar GDO-101M (1994-1996) (Low confidence). How to tell: Marked GoldStar with a grey circle on top. Capacitors: ConsoleMods says to replace C123 near the coin cell (22 to 100 uF 16V or higher) for cold-boot trouble; no full list found. Capacitor list differs from other revisions: not known. Source
Panasonic FZ-10 Pre-Anvil (1994-1996) (Low confidence). How to tell: Top-loading console with separate system chips. Capacitors: No cap list found. Capacitor list differs from other revisions: not known. Source
Panasonic FZ-10 Anvil (Low confidence). How to tell: Top-loading console with the system chips merged into one Anvil chip. Capacitors: No cap list found. Capacitor list differs from other revisions: not known. Source

Where to start

Clues from write-ups and forum threads, not a diagnosis. Low confidence means one thread or one repair; high means several write-ups agree.

Continuous reboots (Medium confidence). ConsoleMods names FZ-1 caps C1, C36, C401 and C123 for the continuous-reboot symptom, with C1 leaking onto C36 and C123 on GoldStar boards. Source
C35 leak (Medium confidence). One FZ-1 restoration replaced all the electrolytics and found C35 (1000uF 6.3V) had leaked. It says the board has up to 26 through-hole caps. Source
Black screen after a recap (Low confidence). One unresolved thread reports a black screen after an FZ-1 recap, read as a warning to check polarity and pads. Source

Tips, tales and maybes

Found in write-ups and forum threads. These are other people's reports, not tested by us. Check part references and values against your own board.

Story: No power on an earlier-recapped FZ-1 (Low confidence). A no-power FZ-1 thread found caps 1, 35 and 36 had been replaced before with poor soldering and a damaged but continuous C36 positive pad, plus a missing thyristor at D2 and a corroded R2. A US unit used on 240V was suspected, which shows an old recap can hide the real fault. Source
Tip: Which caps are the main failures (Low confidence). A Reddit thread (seen on the redlib.hackliberty.org mirror) on a Console5 FZ-1 recap says C35 and C36, near the power supply, are primary failures due to regulator heat, and that the CD drive should be recapped since it is a main cause of bad disc reads. It adds that controller board caps are not in the kit, and that running the console without C36 is unreliable since it handles soft-start. Source
Story: Flashing ready LED and clicking (Low confidence). On Atariage, an FZ-1 that flashed its ready LED, clicked and gave no picture after storage drew advice to replace at least C35 and C36 and preferably recap everything. The poster also found hot glue on the CD drive screws. Source
Story: Very low audio fixed by electrolytics (Low confidence). In an AtariAge thread about where old caps hide, an owner said very low 3DO audio was fully cured by replacing electrolytics and may have improved the picture too. Source
Tip: C401 reset cap and ODE hangs (Medium confidence). RetroRGB says the FZ-1 reset cap C401, next to the eject button, causes random boot hangs with original drives and ODEs, and fitted 22uF 5V while saying 20 to 100uF at 10V or more should do. It suggests this single-cap swap if you lack the gear for a full recap, and says to note the negative leg direction first. Source
Tip: Red power light, then dead (Low confidence). On RacketBoy, an FZ-1 whose power light turned red and needed several on/off cycles before dying drew the advice that if one cap is bad all should be replaced, and not to test caps one by one. A cap can be bad without showing signs, and the sticky gunk near the PSU can be epoxy holding wires, not leakage. Source
Story: Works 15 to 20 minutes then will not restart (Low confidence). On r/3DO (seen on the lr.in.psf.lt mirror) an FZ-1 that died after 15 to 20 minutes was blamed on caps near the switching ICs and regulators in the lower left (drive facing you), an area that runs very hot. Replies suggested clearing corrosion and putting a wire through damaged vias, a Noctua fan, and checking the fuse separately. Source
Tip: No audio or video, faint jumpy lines (Low confidence). In another RacketBoy FZ-1 thread, a reply listed looking for swelled domes, checking joints under magnification, reflowing, testing resistors and verifying the 9V and 5V outputs, noting that the 3DO's failure modes are not well documented. It also said to replace the larger caps first if symptoms persist and to be careful probing live supplies. Source
Story: No audio cured by recap (Medium confidence). A restoration write-up on an FZ-1 with no audio on composite or S-Video found leaky electrolytics in the PSU section, including seepage under C35 cleaned with 99.9% isopropyl, and audio returned after the recap. The author also replaced the soldered CR2032 PRAM battery with an Amiga-style adapter that bypasses the charge-prevention diode. Source
Watch out: Full recap, still flashing LED: check the zener (Low confidence). On AtariAge, an FZ-1 with a flashing power LED and cycling fan did not improve after a complete recap, and the owner then suspected the zener D3 in the power section. The owner noted zeners cannot be tested properly in circuit with a basic meter, and the thread has no final result. Source

Before you start

Boards changed during production. Check your board number against the guides before you order parts.
A mains power supply can hold a dangerous charge. If you are not trained to work on one, have a professional do it.

Guides we used

This page and the interactive bench are built from these. They have the photos and the full detail, so please read them and support their authors.

3DO: General Troubleshooting (Write-up) by ConsoleMods Wiki, CC BY. Names specific FZ-1 caps for the continuous-reboot symptom (C1, C36, C401, C123)
1994 Panasonic 3DO (FZ-1) repair and restoration (Write-up) by Adam Wilson (Retro Repairs & Refurbs). Replaced all electrolytics on an FZ-1; names C35 (1000uF 6.3V) leak; says the board has up to 26 through-hole caps. Site states all rights reserved, so link only
3DO black screen after recap (Forum) by AtariAge forum (thread). Unresolved post-recap black screen on FZ-1; read as a warning to check polarity and pads
Which consoles are the most prone to need recap? (Forum) by AtariAge forum members. Community opinion: NEC, Game Gear, pre-1995 CD consoles (Sega CD Model 1, LaserActive, 3DO) and Xbox clock cap rank worst; 8-bit systems hold up better. Opinion, not a list
Console5 wiki: Panasonic 3DO FZ-1 (Wiki) by Console5. A community wiki page for this machine, often with board photos and capacitor lists.
Console5 wiki: Goldstar 3DO (Wiki) by Console5. A community wiki page for this machine, often with board photos and capacitor lists.

The capacitor list

We have not checked a capacitor list for this machine yet, so none is shown. Follow the guide above for your board, then add the capacitors in the interactive checklist and it builds a shopping list for you.

Skip the sourcing

Ready-made kit: Amazon · eBay
Already recapped: Amazon · eBay

While you are in there

Need the machine itself?: Amazon · eBay
A box of spare capacitors: Amazon · eBay

Affiliate links. As an Amazon Associate I earn from qualifying purchases. These links only search by name. Disclosure

Steps, tools and safety

The steps, the tools in top, middle and budget picks, and the safety list are the same for every machine, so they live on one page: How to recap, step by step.

Values are shown as published in the guides above, and boards changed during production. Check the board in front of you. A recap involves hot tools and, on some machines, dangerous voltages. You do it at your own risk.