Pioneer GM-D9605 Instrukcja serwisowa - Strona 9
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5
5.2 OPERATIONAL FLOWCHART
No sound from the speakers
Is the LED blue?
Y
Is the reference
voltage correct?
Y
Is there any signal on
the isolator output?
Y
Is there any signal
on the AMP input?
Is there any signal
on the AMP output?
5
6
N
N
N
N
Y
N
6
7
Protection function is operating
Possible factors are as follows
DC voltage is applied on Speaker output.
Failure of IC113 and IC508, Q105/106, Q205/206, Q305/306, Q405/406
Speaker output is short-circuited
Failure of IC113 and IC508, Q105/106, Q205/206, Q305/306, Q405/406.
Over-temperature detection circuit is operating (malfunction)
Failure of TH701/702.
Overvoltage detection circuit is operating (malfunction).
Failure of R712/713/714.
Power supply is abnormal
Possible factors are as follows
The voltage [about +15V] isn't on IC703 output (2pin).
Failure of IC701 or IC703.
The voltage [about -15V] isn't on IC704 output (3pin).
Failure of IC701 or IC704.
The voltage [about +5V] isn't on IC707 output (3pin).
Failure of IC707.
The voltage [about -5V] isn't on IC708 output (3pin).
Failure of IC708.
Circuit is an abnormal condition.
Possible factors are as follows
Can not find out signal · IC102 (1pin) and IC102 (7pin)
Failure of IC102.
Can not find out signal · IC302 (1pin) and IC302 (7pin)
Failure of IC302.
Can not find out signal · IC501 (1pin) and IC501 (7pin)
Failure of IC501.
Circuit is an abnormal condition
Possible factors are as follows
The signal can't be found on the minus extreme side of C143.
Failure of IC103~106.
The signal can't be found on the minus extreme side of C243.
Failure of IC103~106.
The signal can't be found on the minus extreme side of C343.
Failure of IC303~307.
The signal can't be found on the minus extreme side of C443.
Failure of IC303~307.
The signal can't be found on the minus extreme side of C550.
Failure of IC502~507.
Circuit is an abnormal condition
Possible factors are as follows
The signal can't be found on the Speaker terminal side of L101.
Failure of IC113 and Q105/106.
The signal can't be found on the Speaker terminal side of L201.
Failure of IC113 and Q205/206.
The signal can't be found on the Speaker terminal side of L301.
Failure of IC113 and Q305/306.
The signal can't be found on the Speaker terminal side of L401.
Failure of IC113 and Q405/406.
The signal can't be found on the Speaker terminal side of L501.
Failure of IC113 and Q515/518.
GM-D9605/XEEL
7
8
A
B
C
D
E
F
9
8