Troubleshooting - Sony STR-ZA5000ES Service Manual

STR-ZA5000ES
Flow of repair (when sound is not outputted)
START
NG
The "PROTECT" is The voltage of the following pin
not displayed on is 3.3 V.
the fluorescent DIGITAL board: IC8002
indicator tube. pin 95 (PROTECTOR)
OK
Check that the condition is
improved, even if you do the
following works.
1. Short-circuit the both ends
of the C8011 on the
DIGITAL board.
2. Perform the "SHIPMENT
MODE" (refer to page 32)
Not improved
Replace the DIGITAL board.
Measure the power amplifier
circuit (example: Q620 on the
AMP board, Q820 on the
HEIGHT_P-TR board) with a
tester, and check the following
things.
1. Between the power supply
line and the ground does not
short-circuit.
2. The resistance is normal.
Check the power transistor
(example: Q600 on the AMP
board, Q800 on the HEIGHT_
P-TR board), power amplifier
circuit (example: Q620 on the
AMP board, Q820 on the
HEIGHT_P-TR board) and
surrounding circuit, and replace
the defective parts.
A
– Continued the
page 37 –
36
SECTION 5

TROUBLESHOOTING

NG
The following fuses are not
damaged.
SPTM board: F911, F912
STBY board: F01
OK
Check that the power transistor
(example: Q600 on the AMP
board, Q800 on the HEIGHT_
P-TR board), power amplifier
circuit (example: Q620 on the
AMP board, Q820 on the
HEIGHT_P-TR board) and
surrounding circuit are not
defect.
Check that the current detect
circuit (example: Q604 and
Q605 on the AMP board, Q804
and Q805 on the HEIGHT_
P-TR board) and surrounding
circuit are not defect.
Check the protector circuit
(example: Q510 on the AMP
board) and surrounding circuit,
and replace the defective parts.
NG Check the surrounding circuit,
and replace the defective parts.
OK
NG
Between the B+ line/B– line
and the ground on the SPTM
board does not short-circuit.
OK
NG
Check the surrounding circuit
of the power transistor
(example: Q600 on the AMP
board, Q800 on the HEIGHT_
P-TR board) and power
amplifier circuit (example: Q620
on the AMP board, Q820 on the
HEIGHT_P-TR board), and
replace the defective parts.
OK
NG Check the surrounding circuit,
and replace the defective parts.
OK
Measure the power transistor
(example: Q600 on the AMP
board, Q800 on the HEIGHT_
P-TR board) with a tester, and
check the following things.
1. The circuit does not
short-circuit.
2. The resistance is normal.
NG
OK
NG
OK