Read Sony STR-DN1030 (serv.man2) Service Manual online
STR-DN1030
2
SECTION 1
SERVICING NOTES
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START
Check that the “PROTECT” is
not displayed on the
fluorescent indicator tube.
OK
OK
OK
OK
OK
OK
OK
OK
OK
Check that voltage of the
following pin is 3.3 V.
DIGITAL board:
IC2105 pin 87 (PROTECTOR)
Check that the defect is not
improved, even if you do
the following works.
1. Short
‐circuit the both
ends of the C2112 on the
DIGITAL board.
2. Perform the “SHIPMENT
MODE” (refer to page 13 on
the original service manual).
Check the IC2105 on the
DIGITAL board and the
surrounding circuit, and
exchange the defective
parts.
Check the surrounding circuit of power
transistor (example: Q703 on the MAIN
board) and the surrounding circuit of
power amplifier IC (example: IC701
on the MAIN board), and
exchange the defective parts.
– Continued on
page 3 –
Check that the following
fuses are not damaged.
MAIN board: F912, F913
STANDBY board: F901
Check that the power transistor
(example: Q703 on the MAIN
board), the power amplifier IC
(example: IC701 on the MAIN
board) and the surrounding
circuit are not defect.
Check that the surrounding
circuit of current detect
(example: Q711 and Q712 on
the MAIN board) is not defect.
Check the surrounding circuit
of protector (example: Q320 on
the MAIN board), and exchange
the defective parts.
Check that between the +59 V line/–59 V
line and the ground does not short circuit.
Check the surrounding circuit of power
transistor (example: Q703 on the MAIN
board) and the surrounding circuit of
power amplifier IC (example: IC701
on the MAIN board), and exchange the
defective parts.
Check the surrounding circuit,
and exchange the defective parts.
Measure the power transistor
(example: Q703 on the MAIN board)
with a tester, and check the following
things.
1. Check that the circuit does not short-
circuit.
2. Check that resistance is normal.
Check the surrounding circuit,
and exchange the defective parts.
Measure the power amplifier IC (example:
IC701 on the MAIN board) with a tester,
and check the following things.
1. Check that between the power supply
line and the ground does not short
‐circuit.
2. Check that resistance is normal.
TROUBLESHOOTING
Flow of Repair (when sound is not outputted) (1/6)
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