Check that the voltage of PROT2
is active. [Q144 : collector]
Malfunction of [U8601, 8602].
Malfunction of [U414].
Malfunction of [U412].
Malfunction of [D8601].
Malfunction of [U201].
・Detection of the DC offset
・Thermal detection
・Over current
Damage to power amplier
Damage to power supply circuit
Check that voltage is supplied
to the [C407, C408]
Check that voltage is supplied
to the [U414] output (+5V)
Check that voltage is supplied
to the [U412] output (+5V)
Check that voltage is supplied
to [N1011 : 1, 2pin]
Check that voltage is supplied
to [C207]
Check the input level, speaker
connector and speaker resis-
tance value
Check that the voltage of VOLT-
AGE_PROT is active. [Q120 :
Collector]
Check that voltage is supplied
to [U102 : 48pin]. (ANA_MODE)
Malfunction of [D8602-8605].
Check that voltage is supplied
to [U201 : 5pin]
Check that voltage is supplied to
[N450 : 1pin] and [N450 : 4pin]
Hi → Lo Hi → Lo
Active Active
NG
NG
NG
NG
NG
Hi
Hi
Malfunction of [U8502, D8513 -
8520].
Malfunction of [Q101, 104].
Check that voltage is supplied
to [N311 : 1pin] (U8503 output)
Check that voltage is supplied
to the [Q104 : collector]
NG
NG
YES
YES
YES
YES
YES
YES
YES
YES Hi
NG
NG
YES
YES
YES
45
Caution in
servicing
Electrical Mechanical Repair Information Updating
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