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Sony HB-F500 Capacitor Replacement Guide

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Sony HB-F500 main board
Japanese HB-F500 main board (PU-46). Its layout and designators differ from the European PU-35 board listed below.

Sony's service manual for the HB-F500P and HB-F500F lists every capacitor in the European Sony HB-F500, with part numbers, so the tables below are taken from it. The Japanese HB-F500 uses a different main board (PU-46) and a 100 V supply; check its boards against these lists before ordering.[1][2][3]

Which to replace first

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The HB-F500 is not on the MSX Resource Center's list of MSX machines with failure-prone capacitors.[4] General advice there is that the main power supply capacitors are worth replacing whatever their condition, that audio and video capacitors show their state in the output, and that the small supply-bypass capacitors around the board can usually wait.[5] On this machine that means the PS-101 board first, then the DUS-111 video board if the picture or sound is poor.

Circuit board tracks on this model lift easily when soldered or desoldered, so take care removing capacitors.[6]

Power supply, PS-101 board

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PS-101 capacitors (parts list, part 2 page 7-14)[1][7]
Ref Value Voltage Sony part number Position
C901 22,000 µF electrolytic 16 V 1-125-413-00 +5 V reservoir, after bridge D901
C902 10,000 µF electrolytic (15,000 µF on the schematic) 25 V 1-124-772-11 +12 V reservoir
C903 470 µF electrolytic (330 µF on the schematic) 35 V 1-123-348-00 −12 V reservoir
C907 100 µF electrolytic 10 V 1-123-307-00 +5 V output, IC901
C908 100 µF electrolytic 16 V 1-123-333-00 +12 V output, IC902
C909 100 µF electrolytic 16 V 1-123-333-00 −12 V output, IC903
C904 to C906 0.33 µF film 50 V 1-136-171-00 Regulator inputs
C910 to C916 0.022 µF ceramic 50 V 1-101-005-00 Across the rectifier diodes
C917, C918 0.022 µF film 250 V 1-130-456-00 Across the mains, either side of L901; safety-critical
C920 2200 pF ceramic 400 V 1-161-742-00 Across the power switch S901; safety-critical

Check the values printed on the C902 and C903 fitted to your board before ordering, as the schematic and parts list disagree. C917, C918 and C920 are safety parts and must be replaced with the same type.[7][1]

Main board, PU-35

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PU-35 electrolytic capacitors (parts list, part 2 page 7-9)[8]
Ref Value Voltage Sony part number
C6 470 µF 6.3 V 1-123-298-00
C12 3.3 µF 50 V 1-123-382-00
C17, C29, C96 47 µF 16 V 1-123-332-00
C25, C26, C38, C54, C93 4.7 µF 25 V 1-123-369-00
C41, C80 47 µF 6.3 V 1-123-306-00
C46 33 µF 6.3 V 1-123-318-00
C65 10 µF 16 V 1-123-356-00

The remaining PU-35 capacitors are ceramic and film. CV1 and CV2 are trimmer capacitors for the clocks; do not disturb them, and if they are moved, set them again as described in the Sony HB-F500 General Maintenance guide.[8][9]

Video and audio board, DUS-111

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DUS-111 electrolytic capacitors (parts list, part 2 page 7-12)[10]
Ref Value Voltage Sony part number
C501, C506, C510, C515 470 µF 10 V 1-123-310-00
C502, C507, C509, C511 100 µF 10 V 1-123-307-00
C505, C516 100 µF 16 V 1-123-333-00
C504, C508, C512, C514 4.7 µF 25 V 1-123-369-00
C513 47 µF 16 V 1-123-332-00
C527 47 µF 10 V (as listed) 1-123-306-00
C529 47 µF 6.3 V 1-123-306-00
C524 0.47 µF 50 V 1-123-379-00

C527 and C529 share a part number in the list but are given different voltages; fit 10 V or higher for both. The DUS-111 also carries the Ni-Cd clock battery, BATT501.[10][11]

Slot board and keyboard

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EX-101 and KEY board electrolytics (parts list, part 2 pages 7-14 and 7-15)[1]
Board Ref Value Voltage Sony part number
EX-101 C69, C75 47 µF 6.3 V 1-123-306-00
EX-101 C70, C71 4.7 µF 25 V 1-123-369-00
KEY C6 33 µF 16 V 1-124-896-00

Procedure

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  1. Unplug the machine and remove the upper case. For the PS-101 board, take off the bottom plate and the heat sink as described in the Sony HB-F500 General Maintenance guide; for the EX-101 board, remove the front panel and cartridge holders first.[12]
  2. Replace one capacitor at a time, matching value, at least the voltage rating, and polarity.[5]
  3. Desolder gently; the board tracks on this model lift easily.[6]
  4. Check the Ni-Cd battery on the DUS-111 board for leakage while the board is accessible.[11]
  5. Reassemble, refitting the heat sink's insulating sheet.[12]

After the recap

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Measure +5 V at pins 45 or 47, +12 V at pin 48 and −12 V at pin 50 of a cartridge slot, against pin 41.[13] Check that the machine starts into MSX Disk BASIC and that the RGB and composite pictures are clean. If colours are wrong after work on the DUS-111 board, set the RGB levels as described in the Sony HB-F500 General Maintenance guide.[9]

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References

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  1. ↑ 1.0 1.1 1.2 1.3 Sony, HB-F500P/F500F Service Manual, part 2, PDF pages 70 and 71 (printed 7-14 and 7-15), electrical parts lists. PS-101 board: C901 1-125-413-00 electrolytic 22,000 µF 16 V; C902 1-124-772-11 electrolytic 10,000 µF 25 V; C903 1-123-348-00 electrolytic 470 µF 35 V; C904 to C906 film 0.33 µF 50 V; C907 1-123-307-00 electrolytic 100 µF 10 V; C908, C909 1-123-333-00 electrolytic 100 µF 16 V; C910 to C916 ceramic 0.022 µF 50 V; C917, C918 1-130-456-00 film 0.022 µF 250 V and C920 1-161-742-00 ceramic 0.0022 µF 400 V, all marked safety-critical; D901 D5FB20F; D902, D903 U05G; D904 10E-2; F901 1-532-284-00 fuse, time-lag 0.63 A (safety-critical); IC901 STR9005; IC902 SI-3122V; IC903 NJM79L12A; L901 coil (safety-critical). EX-101 board: C69, C75 1-123-306-00 electrolytic 47 µF 6.3 V; C70, C71 1-123-369-00 electrolytic 4.7 µF 25 V. KEY board: C6 1-124-896-00 electrolytic 33 µF 16 V. LE-38 board: D905 GL-3NG5. CN-110 board: CN20, 13-pin jack. CN-120 board: 34-pin connector.
  2. ↑ File:Sony HB-F500 main board.jpg, main board of a Japanese HB-F500 photographed for the MSX Resource Center wiki (uploaded by Mars2000you, 7 January 2023). Read from it: printed PU-46 and 1-617-525-12; the WD2793A-PL floppy controller is IC52 on this board.
  3. ↑ Rating label of a Japanese HB-F500, photographed for the MSX Resource Center wiki (File:Sony HB-F500 rating label.jpg, uploaded by Mars2000you, 7 January 2023): "MODEL HB-F500 HOME COMPUTER", "100V 47W 50/60Hz", ソニー株式会社, Made in Japan.
  4. ↑ Vulnerable MSX hardware, MSX Resource Center wiki—link(accessed 2026-10-21) All MSX2 and later machines have a battery for the real-time clock; drained batteries, alkaline ones especially, leak; take removable batteries out before storage; lithium AA cells as an alternative. Lists the Sony HB-75P ("not as serious, as the problem caps are on separate small PCBs"), HB-F1II, HB-F1XD, HB-F1XDJ ("the ELNA caps are risky, the Nichicon ones are ok"), HB-F1XDmk2 and HB-F1XV among models with leaky capacitors. Fractured solder joints on DIN, RCA and DE-9 connectors cause flickering video and crackling sound; reflow them.
  5. ↑ 5.0 5.1 Recap recommendations, June 2018—link(accessed 2026-10-21) Reply by RetroTechie, 23 June 2018: in an MSX, the electrolytics used for supply bypassing round the board can often be removed without the machine stopping; those in the audio and video circuits show their condition in the output; those in the main power supply are worth replacing whatever their condition; compare the service manual's parts list with the board, and replace capacitors one at a time to avoid mixing up values or polarity; buy from established distributors. Wlcracks recommends Rubycon, Chemi-Con, Nichicon or Panasonic parts and checking the board for leakage and smell.
  6. ↑ 6.0 6.1 [WTS] MSX2 Sony HB-F500 (Japanese), August 2025—link(accessed 2026-10-21) Replies: Pencioner (4 August 2025), the Japanese connector is RGB21 (JP21) with a different pin-out from SCART, so a SCART cable will not work and is dangerous; Wierzbowsky (7 August 2025), the drives in Sony's F-series machines fail often, with one or both heads dead, and are not interchangeable with Philips NMS 8250 drives although they look the same; SonyTEL (8 August 2025), an HB-F500F ran a bulletin board around the clock from 1988 to 2003 with 25 mm spacers under its feet for ventilation, and its drive is a Mitsumi D357; gdx (12 August 2025), common HB-F500 problems are the RAM split across slots 0-x on some models, fragile PCB tracks that lift easily when soldering or desoldering, a VDP that fails easily if a cartridge is inserted with the machine on, the drive's upper head being torn off when disks are inserted or removed, and cartridges going in label down.
  7. ↑ 7.0 7.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF page 47 (printed 5-25), schematic of the PS-101 and LE-38 boards: mains from CN901 through S901 (power switch, with C920 2200 pF 400 V across it), fuse F901 (T630mA) and line filter L901 with C917 and C918 (0.022 µF 250 V) to the 220 V primary of T901. An 8 V winding feeds bridge D901 (D5FB20), reservoir C901 (22,000 µF 16 V) and IC901 (STR9005) for +5 V, output capacitor C907 (100 µF 10 V). A 16 V winding feeds D902 (S2V20F), C902 (printed 15,000 µF 25 V) and IC902 (SI-3122V) for +12 V, output C908 (100 µF 16 V). A second 16 V winding feeds D903 (S2V20F) and D904 (10E2), C903 (printed 330 µF 35 V) and IC903 (NJM79L12A) for −12 V, output C909 (100 µF 16 V). The rails leave on CNP11 for CN12 on the PU-35 board. The power lamp D905 (GL-3NG5) is on the LE-38 board.
  8. ↑ 8.0 8.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF pages 65 and 66 (printed 7-9 and 7-10), electrical parts list, PU-35 board (A-8080-134-A for the AEP model, A-8080-151-A for France). Electrolytics: C6 1-123-298-00 470 µF 6.3 V; C12 1-123-382-00 3.3 µF 50 V; C17, C29, C96 1-123-332-00 47 µF 16 V; C25, C26, C38, C54, C93 1-123-369-00 4.7 µF 25 V; C41, C80 1-123-306-00 47 µF 6.3 V; C46 1-123-318-00 33 µF 6.3 V; C65 1-123-356-00 10 µF 16 V; the rest are ceramic and film. CV1 and CV2 trimmer capacitors. ICs include IC5 RP5C01, IC6 V9938, IC7, IC12, IC58 and IC59 MB81464-12, IC18 S-3527, IC26 LH0080A, IC41 MB83256-251 (AEP) or -253 (France), IC47 MB83256-256 (AEP) or -254 (France), IC48 and IC54 µPD41254C-15, IC50 CXD1032Q, IC52 TL431CP and IC56 WD2793A-PL02.
  9. ↑ 9.0 9.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF pages 57 and 58 (printed 6-1 and 6-2), alignment. A BASIC adjusting program turns the screen white for the RGB levels (W key), starts the timer clock test (S key) and cancels it (R key). CPU clock: frequency counter on IC26 pin 6, printed specification "3.578281Hz ±5Hz", adjusted with CV on the PU-35 board. Timer clock: 100 kΩ pull-ups between IC5 and +5 V, counter on IC11 pin 15, 15.9999 to 16.0001 Hz, CV1. RGB levels with an RGB monitor connected to CN501 or the outputs terminated in 75 ohms: red at CN501 pin 6 (RV501), blue at pin 8 and green at pin 7 (printed as RV502 for both), each 0.7 V ±0.02 V. FDC, three minutes after switch-on with TP5 grounded: VCO 250 kHz ±1 kHz at TP4 (RV1); read pulse width 0.5 µs ±10 ns at TP3 (RV2); remove the jumper afterwards.
  10. ↑ 10.0 10.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF page 68 (printed 7-12), electrical parts list, DUS-111 board (with the PAL encoder 1-464-577-11 on the AEP model). Electrolytics: C501, C506, C510, C515 1-123-310-00 470 µF 10 V; C502, C507, C509, C511 1-123-307-00 100 µF 10 V; C504, C508, C512, C514 1-123-369-00 4.7 µF 25 V; C505, C516 1-123-333-00 100 µF 16 V; C513 1-123-332-00 47 µF 16 V; C524 1-123-379-00 0.47 µF 50 V; C527 1-123-306-00 47 µF 10 V; C529 1-123-306-00 47 µF 6.3 V. CN501 and CN502 8-pin DIN sockets, CN503 6-pin DIN; IC501 NJM78M09A; IC502 CX-7925B; RV501 to RV503 1 kΩ presets.
  11. ↑ 11.0 11.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF page 15 (printed 3-11), timer circuit: a 24-hour clock, IC5 (RP5C01), backed up by a built-in Ni-Cd battery; the back-up supply comes from BATT501 on the DUS-111 board.
  12. ↑ 12.0 12.1 Sony, HB-F500P/F500F Service Manual, part 2, PDF pages 3 and 4 (printed 2-1 and 2-2), removal: front panel (upper case off, six front panel screws, unplug CNP26 on the PU-35 board, pull the panel forward); EX-101 board (upper case and front panel off, four cartridge holder screws, two cartridge holders, unplug CNP19, CNP13 and CNP11 on the PU-35 board, pull the board out); floppy drive (upper case off, unplug the two connectors at the rear of the drive, remove two drive screws, slide the drive out; the front panel need not come off); heat sink (upper case off, loosen the nine bottom plate screws, remove two screws holding the PS-101 board to the bottom plate and two heat sink screws, and keep the insulating sheet). Components marked with a warning triangle are safety-critical and must be replaced with the Sony part.
  13. ↑ MSX Cartridge slot, MSX Resource Center wiki—link(accessed 2026-10-21) Pin-out of the MSX cartridge slot: pins 41 and 43 ground, 45 and 47 +5 V, 48 +12 V, 50 −12 V, 49 sound input, 42 CPU clock 3.579545 MHz; +5 V must supply up to 300 mA per slot and ±12 V up to 50 mA for all slots.


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