Sony STR-ZA1000ES, Руководство по обслуживанию

Страница: 34 / 126

STR-ZA1000ES/ZA2000ES/ZA3000ES
34
SECTION 5
TROUBLESHOOTING
Flow of repair (when sound is not outputted)
NG
OK
OK OK
OK
OK
Not improved
OK
OK
NG
NG
NG
NG
NG
The voltage of the following pin
is 3.3 V.
DIGITAL board: IC8002
pin 47 (PROTECTOR) The following fuses are not
damaged.
SPTM board: F911, F912
STBY board: F01 Between the +59 V line/–59 V
line and the ground on the
SPTM board does not
short-circuit.
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 30)
Check that the power transistor
(example: Q600 on the AMP
board), power amplifier circuit
(example: Q620 on the AMP
board) and surrounding circuit
are not defect.
Check that the current detect
circuit (example: Q604 and
Q605 on the AMP 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.
Check the surrounding circuit
of the power transistor
(example: Q600 on the AMP
board) and power amplifier
circuit (example: Q620 on the
AMP board), and replace the
defective parts.
NG Check the surrounding circuit,
and replace the defective parts.
NG Check the surrounding circuit,
and replace the defective parts.
START
The “PROTECT” is
not displayed on
the fluorescent
indicator tube.
Replace the DIGITAL board.
A
– Continued the
page 35 –
Measure the power transistor
(example: Q600 on the AMP
board) with a tester, and check
the following things.
1. The circuit does not
short-circuit.
2. The resistance is normal.
Measure the power amplifier
circuit (example: Q620 on the
AMP 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.
OK
Check the power transistor
(example: Q600 on the AMP
board), power amplifier circuit
(example: Q620 on the AMP
board) and surrounding circuit,
and replace the defective parts.