30. C190 waveform diagram in DSP decode state
3.4.2 Key point voltage
1. Power board: +Vc voltage of flat cable holder XS8 is +53V, and -Vc voltage is -53V; negative
voltage of diode VD113 is +14.6V;
2. Power amplifier board: negative voltage of diode VD111 is +22.3V, positive voltage of diode is -
22.3V, pin 3 of N105 mute signal voltage: -19.0V when mute is off, -22.4V when mute is on (main
channel mute signal P_LRM and central surround mute signal P_CSM are separate, central surround
channel in stereo state is always muted);
3. Control panel: ~V3 of flat cable holder XS10 is 26.5 AC; F1, F2 is 2.1V AC each;
4. Video board: pin 1 of XS100 is +12V, pin 3 is -12V;
5. MIC board: before inserting headphone, P_RLY is low level, PH_SW is low level; after inserting
headphone, P_RLY is high level, PH_SW is high level;
6. Decode board: voltage of pin 3 of N109 is 5V, voltage of pin 2 is 2 3.3V, negative voltage of diode
VD103 is 2.5V.
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