Important Safety Notice
The MX121 contains potentially dangerous voltages even when unplugged. Capacitors can retain charge long after power is disconnected. Only qualified technicians should perform these repairs. Always discharge capacitors before working on the unit.
Power Supply Capacitors
-
2200μF 25V - Main filter capacitors
High Priority
Location: Near power input section
Recommendation: Replace with low-ESR, high-temperature (105°C) capacitors
-
470μF 35V - Secondary filtering
High Priority
Location: Near voltage regulators
Recommendation: Panasonic FM or FR series
-
100μF 50V - Regulation circuit
Medium Priority
Location: Around regulator ICs
-
47μF 25V - Decoupling capacitors
Medium Priority
Location: Distributed across board
Audio Section Capacitors
-
10μF 50V - Audio coupling
Medium Priority
Location: Input/output audio stages
Recommendation: Nichicon Muse or Elna Silmic II for best sound
-
47μF 16V - Op-amp power supply
Medium Priority
Location: Near audio ICs
-
1μF 63V - Signal path capacitors
Low Priority
Location: Throughout audio section
Recommendation: Film capacitors if space allows
-
100nF 100V - Decoupling
Low Priority
Location: Near each audio IC
Video/HDMI Section Capacitors
-
22μF 16V - HDMI board power
High Priority
Location: HDMI board
Recommendation: Low-ESR types for stable video
-
4.7μF 50V - Video coupling
Medium Priority
Location: Video processing area
-
10μF 25V - Processor power
Medium Priority
Location: Near main video processor
Digital Section Capacitors
-
100μF 10V - DSP power
High Priority
Location: Near digital signal processor
Recommendation: Low-ESR for clean digital power
-
10μF 16V - Memory backup
Medium Priority
Location: Near configuration memory
-
0.1μF 50V - High-frequency decoupling
Low Priority
Location: Throughout digital section
Recommendation: Ceramic capacitors often better here
