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.

Manuals and technical documents

Service manuals, schematics and datasheets for this machine, kept in our own library. Check your own board and part numbers against them.

• Panasonic 3DO FZ-1 Service Manual (CA, UK) (1994) (Service manual)
• Panasonic 3DO FZ-1 Service Manual (CPD9309012C0) (Service manual)
• Panasonic 3DO FZ-10 Service Manual (E, for UK) (Service manual)
• Panasonic FZ-1 Service Manual Supplement, CPD9311017S1, Main Logic Board and CD-ROM Drive (Service manual)
• Panasonic FZ-1 Service Manual Supplement, IMD9411004S1, Parts Change (Service manual)
• Panasonic FZ-1 Service Manual Supplement, IMD9411005S1, Main Logic Board (Service manual)

All 9 documents for 3DO in the library

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

Panasonic FZ-1 1993 board DFUP0576ZAM2(a) / DFUP0576ZAM3(a)

Twenty-seven capacitors. Console5 says C306, C307, C326 and C327 are SMD on the -AM2 revisions. It lists the CD-ROM board CR-560-B separately and includes it in the same kits.

Panasonic FZ-1 1994 board DFUP0648ZA M(a)

Twenty-four capacitors. Console5 credits this list to Evan Allen.

Panasonic FZ-1 1994 board DFUP0649ZAM3(a)

Console5 says C401 is on the Japanese model only.

Panasonic FZ-1 CD-ROM board CR-560-B

Seven capacitors. Console5 includes these in the main board kits.

GoldStar 3DO main board 6870S-260AA (940914-1)

Eighteen capacitors, mostly 100 uF 16 V.

GoldStar 3DO power board 6870S-263AA

Four capacitors.

GoldStar 3DO CD interface board 1EA4B11A09900

Three capacitors.

GoldStar 3DO CD drive board 1EA4B11A09800

Console5 marks C518 and C528 as NP, which means non-polar, so use non-polar parts there. Twenty-three capacitors.

Shopping list

132 capacitors in all, grouped by value. Buy a few spares.

• 29 x 100 µF, 6.3 V (check your board): Amazon · eBay
• 19 x 100 µF, 16 V (check your board): Amazon · eBay
• 18 x 10 µF, 16 V (check your board): Amazon · eBay
• 11 x 470 µF, 6.3 V (check your board): Amazon · eBay
• 9 x 47 µF, 6.3 V (check your board): Amazon · eBay
• 7 x 100 µF, 10 V (check your board): Amazon · eBay
• 5 x 22 µF, 16 V (check your board): Amazon · eBay
• 5 x 470 µF, 16 V (check your board): Amazon · eBay
• 4 x 220 µF, 6.3 V (check your board): Amazon · eBay
• 3 x 33 µF, 10 V (check your board): Amazon · eBay
• 3 x 470 µF, 10 V (check your board): Amazon · eBay
• 3 x 1000 µF, 6.3 V (check your board): Amazon · eBay
• 3 x 1000 µF, 10 V (check your board): Amazon · eBay
• 3 x 6800 µF, 25 V (check your board): Amazon · eBay
• 2 x 1 µF, 50 V (check your board): Amazon · eBay
• 2 x 1000 µF, 16 V (check your board): Amazon · eBay
• 1 x 0.22 µF, 50 V (check your board): Amazon · eBay
• 1 x 0.47 µF, 50 V (check your board): Amazon · eBay
• 1 x 2.2 µF, 25 V (check your board): Amazon · eBay
• 1 x 10 µF, 50 V (check your board): Amazon · eBay
• 1 x 22 µF, 6.3 V (check your board): Amazon · eBay
• 1 x 4700 µF, 35 V (check your board): Amazon · eBay

Console5 capacitor kits for this machine

Console5 sells ready-made capacitor kits. Kits come in different versions, so match the board number in the kit name to yours and check the listing before you buy.

• Panasonic 3DO Fz 1 Cap Kit
• Goldstar 3DO Cap Kit

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

Step by step

1. Photograph both sides of the board before you touch anything. Zoom in on every capacitor. The photo is your map when you are three hours in.
2. Unplug it, take out the batteries and let it sit. Old power supplies and CRT parts can hold a charge. If your machine has a tube, leave the tube and its board to a professional.
3. Open it up and keep the screws sorted. A muffin tin or an egg carton works. Different screws go in different holes, and the holes never forgive you.
4. Look for leaks. Clean any sticky residue off with isopropyl alcohol and a soft brush. A leaked capacitor leaves brown crust and can eat copper traces. Look at the traces under it, not only the part itself.
5. Mark the polarity of every capacitor on the photo before it comes off. On an electrolytic, the stripe marks the negative leg. The board usually shows a half-shaded circle or a bar for the same spot.
6. Remove the old capacitors one at a time. Surface mount: add fresh solder to both ends and rock the part off, or use flux and a low-melt alloy. Through-hole: heat one leg at a time and clear the hole with wick or a pump.
7. Clean the pads and check for lifted pads or damaged traces. Clean flux off with isopropyl. A bad pad needs a jumper wire, not hope.
8. Fit and solder the new capacitor, matching polarity. Same capacity, same or higher voltage, and it has to physically fit. Work from the smallest parts up.
9. Clean the flux off and look at every joint. A good joint is shiny and shaped like a tiny volcano. A dull blob or a ball is a cold joint: reflow it.
10. With a multimeter, check for shorts across the power rails before you power it on. Use the continuity or resistance setting. A reading near zero means stop and look for a solder bridge.
11. Power it up and test everything: video, sound, controls, the lot. If something is wrong, check polarity first. It is the most common mistake and the easiest fix.

Tools

• Temperature-controlled soldering station. Steady heat so you do not cook pads. Most recaps are done between 320 and 350 C. Top: Hakko FX-951 · Mid: Hakko FX-888D · Budget: Pinecil
• Good solder. Rosin-core 63/37 flows and looks right. It is cheap and it matters. Kester 44 63/37
• Flux. Flux is what makes old joints let go and new joints flow. MG Chemicals flux pen · Chip Quik flux syringe
• Low-melt alloy (for surface mount). Melts old solder on both ends of a surface mount part at once, so it lifts off cleanly. Chip Quik SMD1
• Desoldering tool. Clears the old solder out of through-hole pads. Top: Hakko FR-301 · Mid: Engineer SS-02 pump · Budget: Solder wick
• Fine tweezers. For holding small surface mount parts exactly where you want them. ESD-safe tweezers
• Board holder. A third hand for the board, so both of yours are free. PanaVise circuit board holder
• Magnification. You cannot fix what you cannot see. Surface mount parts are tiny. Top: Stereo microscope · Mid: Head visor · Budget: Lighted magnifier
• Multimeter. Continuity, shorts and rail voltages. The one test that saves boards. Top: Fluke 117 · Mid: Fluke 101 · Budget: AstroAI
• ESR and capacitor tester. Checks old capacitors and your new ones before they go in. Top: Peak Atlas ESR70 · Budget: LCR-T7
• Isopropyl alcohol (99%) and a brush. For cleaning leaked goo and flux. Use the high-percentage kind. MG Chemicals 99.9% isopropyl
• Brass tip cleaner. A clean tip transfers heat. A dirty one does not. Hakko 599B
• Fume extractor. Pulls the smoke away from your face. Hakko FA-400 · Budget: Small bench fan
• Precision screwdrivers. Most old gear uses a mix of Phillips, Torx and security bits. iFixit Pro Tech Toolkit
• Kapton tape. Heat-proof tape to protect parts that sit close to the one you are changing. Kapton tape

Safety

• Good airflow, or a fume fan. Solder smoke is not for breathing.
• Safety glasses on. Solder spits and clipped legs fly.
• Iron in its stand when you are not holding it. Know where the cord is.
• Touch bare metal first, or use a wrist strap. Static kills old chips.
• No tube, no mains power supply. Leave those to a professional.
• Wash your hands after, especially if you used leaded solder.

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.

More

• All recap guides
• The interactive Recap Bench
• Fix a dead vintage computer
• 3DO Interactive Multiplayer on the timeline