Marantz 4230 Receiver Capacitor Tips
Safety Warning: The large power supply capacitors can hold a lethal charge even when the unit is unplugged. If you are not experienced with high-voltage electronics, have this work done by a qualified technician.
Most Common Failures
Primary Failure Points
- Electrolytic Capacitors - The number one issue. They dry out, lose capacitance, increase in ESR, or leak corrosive fluid.
- Output Transistors - Often fail due to power supply issues caused by bad capacitors.
- Bulbs and Lamps - The iconic Marantz blue dial and indicator lights burn out over time.
- Small Signal Transistors - Some become noisy (hiss, crackle, pop) with age.
- Dirty Controls and Switches - Cause static, crackling, or channels cutting out.
Capacitor Replacement Tips
A full "recap" (replacing all electrolytic capacitors) is highly recommended for a 4230 to ensure it performs reliably.
Power Supply Board (P800) - TOP PRIORITY
Located near the large transformer and the two main filter capacitors.
| Reference |
Original Value |
Replacement Suggestions |
| C801 |
10,000µF / 35V |
Main Filter Cap. Size is critical. Measure diameter/height. |
| C802 |
10,000µF / 35V |
Main Filter Cap. Must match C801. |
| C803 |
330µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
| C804-C806 |
100µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
| C807, C808 |
220µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
Main Amplifier Boards (P700 & P750)
These two boards are identical. Re-cap one channel at a time to avoid mixing up parts.
| Reference |
Original Value |
Replacement Suggestions |
| C701/C751 |
220µF / 6.3V |
Nichicon UKW (Muse) or Elna Silmic II |
| C702/C752 |
100µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
| C703/C753, C704/C754 |
4.7µF / 50V |
Nichicon UKW (Muse) or film cap |
| C705/C755, C706/C756 |
47µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
| C707/C757, C709/C759 |
100µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
Phono Preamp Board (P400)
Critical for turntable sound quality. Use high-quality, low-noise capacitors here.
| Reference |
Original Value |
Replacement Suggestions |
| C401, C404 |
100µF / 16V |
Nichicon UKW (Muse) or Elna Silmic II |
| C402, C403 |
3.3µF / 50V |
Nichicon UKW (Muse) or film cap |
| C405, C406, C415, C416 |
220µF / 6.3V |
Nichicon UKW (Muse) or Elna Silmic II |
| C407, C408, C411, C412 |
47µF / 16V |
Nichicon UKW, UPW, or Panasonic FC |
| C409, C410 |
4.7µF / 25V |
Nichicon UKW (Muse) or film cap |
Additional Tips
- Tuner Sections (P300, P200): Only replace capacitors here if experiencing tuner-specific issues, as this may affect alignment.
- Polarity Matters: Always match the negative stripe on new capacitors to the negative marking on the circuit board.
- Capacitor Quality: Use audio-grade caps (Nichicon UKW, Elna Silmic II) for signal paths and low-ESR caps for power supply.
- Order Extras: Order a few extra capacitors of common values in case of mistakes.
- Clean Boards: After removing old capacitors, clean any leaked electrolyte from the board.
Need Professional Help?
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