Protection Circuit - Pioneer VSX-C501-S Service Manual

5

7.1.2 Protection Circuit

DC detection
XPROTECT port
Detection method
(A/D)R397: 56 K-ohms
Less than 0.6-0.8 Vdd
Detection start time 2.8 sec after
Mute: On
Process
Speaker Relay: Off
Shifting to STBY after 3 sec
Display "AMP ERR" flashes for 3 sec
Recovery Hold the STANDBY key pressed for 10 sec.
The unit will recover if the duration of detection is 3 sec or less.
Remarks
Overload detection
XPROTECT port
Detection method
(A/D)R363: 27 K-ohms
0.4-0.6 Vdd
Detection start time 2.8 sec after
Mute: On
Process
Speaker Relay: Off
Shifting to STBY after 3 sec
Display "OVERLOAD" flashes for 3 sec
Recovery Press the STANDBY key.
Remarks
Fan (temperature) and short-circuit of the power supply circuit
XPROTECT port (A/D)
Detection method
0.4 Vdd or less
Detection start time 1.0 sec after
Mute: On
Process
Speaker Relay: Off
Shifting to STBY
Display No display
Recovery Hold the STANDBY key pressed for 10 sec.
Remarks
Fan stop
XPROTECT port (A/D)
Detection method
0.4 Vdd or less
Detection start time 1.0 sec after
Mute: On
Process
Speaker Relay: Off
Shifting to STBY
Display No display
Recovery Hold the STANDBY key pressed for 10 sec.
Remarks
5
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VSX-C501-S
6
7
7
8
A
B
C
D
E
F
87
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