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Sharp MZ-6500 Capacitor Replacement Guide

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Sharp MZ-5600 power supply circuit (service manual)
The MZ-5600 power supply board circuit, from Sharp's service manual

The Sharp MZ-6500's electrolytic capacitors are on the power supply board, the CPU board and the video board. The values below come from Sharp's service manual for the MZ-5600, the export version of the MZ-6500; Japanese MZ-6500 sets may differ, especially on the power supply.[1][2] The power supply parts list gives each capacitor with its reference; the CPU board list gives only the types used.

Before you start

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  • Unplug the machine. The supply's main reservoir, C3, is 10,000 µF; check it has discharged before touching the board.[3]
  • Follow Sharp's handling notes for the supply board: keep the jumper JP-1 intact, take care with the insulation sheet, and refit component screws to 4 kgf·cm and others to 6 kgf·cm. See the General Maintenance guide.[4]

Power supply (secondary board)

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[3]

MZ-5600 power supply electrolytic capacitors (parts list)
Reference Value Voltage Position on the circuit
C3, C22 10,000 µF 50 V C3: main 29 V reservoir
C1 330 µF 50 V −12 V regulator input
C2 100 µF 25 V −12 V output
C9 3,300 µF 10 V +5 V output
C10 1,000 µF 10 V +5 V output
C16, C17, C24 330 µF 25 V C16 and C17: +12 V output
C18 100 µF 25 V Switching controller circuit
C19, C21, C28 22 µF 50 V C19 and C28: switching drive circuit; C21: ALARM timing
C20 4.7 µF 50 V ALARM circuit

[3] Two points to check on the board before ordering:

  • The circuit marks C17 as 220 µF 25 V, while the parts list gives 330 µF.
  • The parts list includes C22 (10,000 µF 50 V) and C24 (330 µF 25 V), which do not appear on the circuit page.[3]

The primary board has film capacitors only: a 0.1 µF 250 V capacitor across the line and two 2200 pF line-bypass capacitors to earth.[5]

CPU board

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The CPU board parts list gives the electrolytic types used without their positions, so read the references from the CPU board circuits (PDF pages 90 onwards of the manual) or from the board itself.[6]

MZ-5600 CPU and video board electrolytic types (parts lists)
Board Value Voltage Sharp part number
CPU 10 µF 16 V VCEAAU1CW106
CPU 22 µF 16 V VCEAAU1CW226
CPU 33 µF 16 V VCEAAU1CW336
CPU 100 µF 16 V VCEAAU1CW107
CPU 220 µF 16 V VCEAAU1CW227
CPU 33 µF 25 V VCEAAU1EW336
CPU 220 µF 25 V VCEAAU1EW227Q
CPU 1 µF 50 V VCEAAU1HW105
CPU 3.3 µF 50 V VCEAAU1HW335
CRT (video) 100 µF 16 V VCEAAU1CW107Q

[6] The CPU board also carries the clock's rechargeable backup battery (UBATN1001ACZZ), which is not a capacitor but should be checked for leakage while the board is out.[6][7]

Procedure

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  1. Note each capacitor's polarity marking on the board before removing it.
  2. Fit parts of the same capacitance and the same or a higher voltage rating that fit the space.
  3. After work on the supply, check +5 V and +12 V against Sharp's limits (5 V ± 0.02 V and 12 V ± 0.05 V) and trim with VR1 and VR2 if needed.[8]
  4. Run the self check described in the Troubleshooting Guide.
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References

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  1. ↑ Sharp Corporation, Service Manual, Personal Computer Model MZ-5600 (code 00ZMZ5600SM/E). Hosted as File:Sharp MZ-5600 Service Manual.pdf; description at Sharp MZ-5600 Service Manual.
  2. ↑ MZ (コンピュータ), Wikipedia (Japanese)—link(accessed 2026-10-21) MZ-5600: the overseas model of the MZ-6500.
  3. ↑ 3.0 3.1 3.2 3.3 Sharp, MZ-5600 service manual, parts list "Power supply (SEC.) unit", printed page 12 of the parts list (PDF page 133), and the power supply board circuit (PDF page 107), also hosted as File:Sharp MZ-5600 power supply circuit (service manual).png. Parts list: C1 50ULB330 (50 V 330 µF); C2 and C18 25ULB100 (25 V 100 µF); C3 and C22 KM50VRSN10000 (50 V 10,000 µF); C4, C7, C12, C14 and C27 50F2S103K (0.01 µF film); C5 50F2S222K; C6 and C13 0.00047 µF 50 V; C8 50F2S223K; C9 10ULB3300 (10 V 3,300 µF); C10 10ULB1000 (10 V 1,000 µF); C11 50F2S102K; C15, C23 and C25 50F2S104K; C16, C17 and C24 25ULB330 (25 V 330 µF); C19, C21 and C28 50ULB22 (50 V 22 µF); C20 50ULB4R7 (50 V 4.7 µF); C26 50F2S333K. Circuit: C1 50 V 330 µF; C2 25 V 100 µF; C3 50 V 10,000 µF; C9 10 V 3,300 µF; C10 10 V 1,000 µF; C16 25 V 330 µF; C17 25 V 220 µF; C18 25 V 100 µF; C19 and C28 50 V 22 µF; C20 50 V 4.7 µF; C21 50 V 22 µF. Section 16-2 (6): the ALARM rising edge is delayed at power-on by R40 and C21, and the falling edge is set by the discharge of C21 through R41, R42 and VR3.
  4. ↑ Sharp, MZ-5600 service manual, section 16-3 (1), "Hints and tips", printed page 81 (PDF page 82).
  5. ↑ Sharp, MZ-5600 service manual, parts list "Power supply (PRI.) unit" (PDF page 132): capacitor for line bypass (2200 pF); capacitor 250 V 0.1 µF; and the power supply board circuit (PDF page 107): C1 0.1 µF, C2 2200 pF × 2.
  6. ↑ 6.0 6.1 6.2 Sharp, MZ-5600 service manual, parts list "CPU PWB unit", PDF page 125: aluminium electrolytic capacitors 16 V 10 µF (VCEAAU1CW106), 16 V 100 µF (VCEAAU1CW107), 16 V 22 µF (VCEAAU1CW226), 16 V 220 µF (VCEAAU1CW227), 16 V 33 µF (VCEAAU1CW336), 25 V 220 µF (VCEAAU1EW227Q), 25 V 33 µF (VCEAAU1EW336), 50 V 1.0 µF (VCEAAU1HW105) and 50 V 3.3 µF (VCEAAU1HW335); the other capacitors are ceramic and film types; battery UBATN1001ACZZ. Parts list "CRT PWB unit", PDF page 124: 16 V 100 µF (VCEAAU1CW107Q).
  7. ↑ Sharp Corporation, MZ-5500/5600 Technical Reference Vol. 2 (Hardware) (File:Sharp MZ-5500 and MZ-5600 Technical Reference Vol. 2.pdf), section 13, "RTC (Real Time Clock)": the backup battery is recharged while the power is on and keeps the RP5C01's time and RAM when it is off.
  8. ↑ Sharp, MZ-5600 service manual, section 16-2 (7), "Adjustments", printed page 81 (PDF page 82): VR1 +5 V, 5 V ± 0.02 V; VR2 +12 V, ± 0.05 V.


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