Panasonic CF-2000 Troubleshooting Guide
No service manual for the Panasonic CF-2000 (sold in Japan as the National CF-2000) has been found. Matsushita's owner's manual has a short fault table, connector pinouts and the start-up screen; the checks below use those and a photograph of the inside.[1] For mains safety and the handling rules see the Panasonic CF-2000 General Maintenance guide.
Matsushita's fault table
[edit | edit source]The owner's manual asks the user to work through this table, translated here, and to unplug the computer before taking any further action.[2]
| Symptom | Cause given | Check |
|---|---|---|
| No picture | No power | The mains supply and the power cord |
| No picture | Bad connection | Reconnect as shown on page 4 and push plugs and connectors fully home |
| No picture | Wrong television channel | Match the RF converter's channel switch to the television; on a video input, set the television to video |
| No colour | Television not adjusted | Adjust the television's colour and contrast |
| No colour | Program | Check whether a COLOR statement has been run |
| Characters hard to read | Television not adjusted | Fine tuning and colour adjustment |
| Picture rolls | Television not adjusted | Tuning, vertical hold and horizontal hold |
| Only random characters on screen | The computer did not start properly | Switch off and on again |
| Keyboard does not respond | The computer has crashed (program error) | Press CTRL and STOP together; if that fails, switch off and on again |
| CSAVE or CLOAD fails | Cassette recorder trouble | Check the recording and playback leads and the cassette procedure on page 20; a tape saved at 2400 baud may not load except from a dedicated data recorder |
Start-up screen
[edit | edit source]A working CF-2000 shows this at switch-on, with the power lamp lit:[3]
MSX BASIC version 1.0 Copyright 1983 by Microsoft. 12431 Bytes free Ok
If the lamp lights but there is no picture, check the video connection before the computer: composite video comes from the RCA socket, and the 5-pin DIN socket feeds only the CF-2111 RF converter.[4] On the MSX Resource Center forum, a Caps Lock lamp that toggles is used as a quick sign that the processor, ROM and RAM are running.[5]
Measure the rails
[edit | edit source]Measure at a cartridge slot against pin 41: +5 V on pins 45 and 47, +12 V on pin 48 and −12 V on pin 50.[4] The memory is µPD416 dynamic RAM, eight chips for the main RAM and eight for the video RAM, and those chips also need −5 V, which is not on the slot.[6][7] Measure all three at one of the chips: pin 9 (+5 V), pin 8 (+12 V) and pin 1 (−5 V), against pin 16.[7]
| Finding | Look at |
|---|---|
| No rails, power lamp dark | The mains supply (100 V), the power switch on the left side, the transformer, and the rectifiers and regulators on the supply board |
| One rail missing | Its regulator and reservoir capacitor on the supply board, and the ribbon harness to the main board |
| +5 V pulled low | A short on the main board; a failed ceramic decoupling capacitor can short the supply to ground[5] |
| −5 V or +12 V missing at the µPD416s | The supply board and harness; the dynamic RAMs need all three supplies[7] |
The owner's manual does not describe the supply board.[1]
Slot covers and cartridges
[edit | edit source]According to the manual, opening a slot cover with the power on destroys the program that is running, so a crash when a cover is opened is normal. Insert and remove cartridges only with the power off.[8] If a cartridge does not start, try it in the other slot; unless its own manual says otherwise, either slot will do.[8]
Ports
[edit | edit source]| Symptom | Check |
|---|---|
| No picture through a television aerial input | The CF-2111 RF converter, its +5 V supply on pin 1 of the 5-pin DIN socket, and its channel switch[4][2] |
| No sound | The RCA sound output and the television's audio input[4] |
| Joystick dead | The 9-pin port; the ports are driven by the sound chip (AY-3-8910 compatible) at TTL levels[4] |
| Recorder motor does not start | REM+ and REM− on pins 6 and 7 of the cassette socket[4] |
| Printing | The CF-2000 has no printer port; printers connect through the CF-2121 cartridge[9] |
Related pages
[edit | edit source]- Panasonic CF-2000
- Panasonic CF-2000 General Maintenance
- Panasonic CF-2000 Capacitor Replacement Guide
- Panasonic CF-2000 Documentation
- Panasonic CF-2700 Troubleshooting Guide
- Capacitor Failure Symptoms
References
[edit | edit source]- ↑ 1.0 1.1 Matsushita, パーソナルコンピュータ MSX CF-2000 取扱説明書 (CF-2000 owner's manual, in Japanese). See Panasonic CF-2000 Documentation.
- ↑ 2.0 2.1 Matsushita, CF-2000 owner's manual, 入門編 page 26, "J. アフターサービスについて", section 2, "修理を依頼されるとき" (before asking for repair): symptoms, causes and checks as tabulated. See Panasonic CF-2000 Documentation.
- ↑ Matsushita, CF-2000 owner's manual, 入門編 page 5, "電源投入": switch the display on first, then plug the computer into AC 100 V and switch it on; the power lamp lights and the screen shows "MSX BASIC version 1.0 / Copyright 1983 by Microsoft. / 12431 Bytes free / Ok". See Panasonic CF-2000 Documentation.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Matsushita, CF-2000 owner's manual, 資料編 pages ⑥ to ⑧, "コネクタ一覧": 5-pin DIN video socket 1 +5 V, 2 GND, 3 AUDIO, 4 MONITOR VIDEO, 5 RF VIDEO; RCA composite video and audio; 8-pin DIN cassette 1, 2, 3, 8 GND, 4 CMTOUT, 5 CMTIN, 6 REM+, 7 REM−; 9-pin joystick ports driven by the AY-3-8910-compatible PSG, 4 input, 1 output and 2 bidirectional lines per port, TTL; cartridge bus 41 and 43 GND, 42 CLOCK, 44 SW1, 45 and 47 +5 V, 46 SW2, 48 +12 V, 49 SUNDIN, 50 −12 V. See Panasonic CF-2000 Documentation.
- ↑ 5.0 5.1 Panasonic CF-2700, October and November 2025—link(accessed 2026-10-21) mcolom: if the Caps Lock LED can be toggled, the Z80 and the ROM are probably working; Briqunullus: the same goes for RAM, and booting with an external RAM cartridge is an easy test; mcolom: a failed ceramic capacitor can short Vcc to ground.
- ↑ File:National CF-2000 inside.jpg, photograph of an opened CF-2000 uploaded to the MSX Resource Center wiki by Mars2000you on 2 June 2025: power supply board marked FBM-4... with IC101, Q101, Q102 and three large reservoir capacitors; main board FBM-485-028 with eight µPD416C-3 and eight µPD416C-2, the AY-3-8910 at IC20 and the D8255AC-5 at IC25; ribbon harness from the supply board.
- ↑ 7.0 7.1 7.2 Matsushita, Service Manual: Personal Computer CF-2700 (IED84113035C2), printed page 9, Fig. 7: µPD416C-3 with +5 V on pin 9, +12 V on pin 8, −5 V on pin 1 and ground on pin 16. See Panasonic CF-2700 Service Manual.
- ↑ 8.0 8.1 Matsushita, CF-2000 owner's manual, 取扱上のご注意 (handling precautions): insert and remove cartridges with the power off; do not open the slot covers by hand; opening them while the power is on destroys the running program. 入門編 page 24: make sure a cartridge is fully home before switching on; any slot may be used unless the cartridge's manual says otherwise. See Panasonic CF-2000 Documentation.
- ↑ National CF-2000, MSX Resource Center wiki, 7 March 2026—link(accessed 2026-10-21) No printer port; a printer is connected by first inserting the CF-2121 cartridge.