Sony STR-DN1050 Service Manual ▷ View online
STR-DN1050
21
SECTION 5
TROUBLESHOOTING
Flow of Repair (when sound is not outputted) (1/5)
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NG
START
Check that the “PROTECT” is not displayed on the fluorescent indicator tube.
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NG
OK
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NG
NG
OK
OK
OK
OK
OK
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OK
OK
OK
Check that voltage of the following
pin is 3.3 V.
DIGITAL board:
IC2100 pin 92 (PROTECTOR)
Check that the defect is not improved,
even if you do the following works.
1. Short - circuit the both ends of the
C2186 on the DIGITAL board.
2. Perform the “SHIPMENT MODE”
(refer to pa
ge 17 on t
he original
service
manual).
Check the IC2100 on the DIGITAL
board and the surrounding circuit,
and exchange the defective parts.
Check the surrounding circuit of
power transistor (example: Q600 on
the MAIN board) and the surrounding
circuit of power amplifier circuit
(example: FL on the MAIN board),
and exchange the defective parts.
– Continued on page 22 –
Check that the following fuses are
not damaged.
MAIN board: F912, F913
STANDBY board: F901
Check that the power transistor
(example: Q600 on the MAIN board),
the power amplifier and the surrounding
circuit are not defect.
Check that the surrounding circuit of
current detect (example: Q605 and
Q604 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 (±B)
line and the ground does not short circuit.
Check the surrounding circuit of power transistor
(example: Q600 on the MAIN board) and the
surrounding circuit of power amplifier IC
(example: PWR AMP on the MAIN board), and
exchange the defective parts.
Check the surrounding circuit, and exchange the
defective parts.
Measure the power transistor (example: Q600
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 circuit
(example: FL 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.
STR-DN1050
22
Flow of Repair (when sound is not outputted) (2/5)
Press the [A.F.D.] button to
select the “MULTI ST”, and
check that the sound by various
source (example: coaxial input,
analog input) is outputted from
all the channels (FL/FR/SL/SR/
SBL/SBR/C/SW).
Check that sound occurs from the RY921 on
the MAIN board by inserting and removing
headphone.
Check the following parts and the surrounding circuit,
and exchange the defective parts.
DIGITAL board: IC2100 HP board: J101
MAIN board: Q375, RY921
Check the following parts and the
surrounding circuit, and exchange the
defective parts.
DIGITAL board: IC2100, IC2502, IC2503, X2500
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: IC2100, IC2107, X2102
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DCDC board: IC1907, IC1909
DIGITAL board: IC2500
Check that voltage of pins of the IC2502
on the DIGITAL board is the following value.
pin 4 : 1.12 V ~ 1.2 V pin 8 : 3.3 V
Check that data is outputted from the following pins.
DIGITAL board: IC2107 pin 16, 19, 20, 21
Check the following parts and the surrounding circuit,
and exchange the defective parts.
DIGITAL board: IC2100, IC2501, IC2502
Check the following parts and the surrounding circuit,
and exchange the defective parts.
DIGITAL board: IC2100, IC2104
Check the following parts and the surrounding circuit,
and exchange the defective parts.
DIGITAL board: IC2100
MAIN board: IC421
Perform the “SOFTWARE VERSION DISPLAY
MODE” (refer to pa
ge 17 on
the original service
manual), and check that the DSP version is not “0.00”.
Press the [MUTING] button on the remote
commander once, and check that the sound is
outputted from this unit.
Explain the settings of this unit to the customer.
Check that data is outputted from the following
pins.
DIGITAL board: IC2502 pin 73, 86, 88, 94
Check that data is outputted from the following
pins.
DIGITAL board: IC2104
pin 15, 16, 19, 20, 21, 22, 26, 27
Check that data is inputted to the following
pins.
MAIN board: IC421
pin 63, 64, 66 ~ 73
Check the surrounding circuit of power
transistor (example: Q600 on the MAIN board)
and the surrounding circuit of power amplifier
circuit (example: FL on the MAIN board), and
exchange the defective parts.
OK
– Continued on page 23 –
OK
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NG
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NG
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OK
OK
OK
OK
OK
OK
OK
STR-DN1050
23
Flow of Repair (when sound is not outputted) (3/5)
Check that the sound from the coaxial
input is outputted.
Check that “COAX” is displayed on the
fluorescent indicator tube.
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: IC2105, IC2107
Check the following parts and the surrounding
circuit, and exchange the defective parts.
MAIN board: IC230, IC231
DIGITAL board: IC2107
Check the following parts and the
surrounding circuit, and exchange the
defective parts.
DIGITAL board: IC2104
Check that “OPT” is displayed on the
fluorescent indicator
Check the following parts and the
surrounding circuit, and exchange the
defective parts.
MAIN board: IC421, J401, J402
Check that the sound from the optical
input is outputted.
Check that the sound from the analog
input is outputted, when the sound field
is “A.F.D. AUTO”.
OK
OK
OK
OK
NG
NG
NG
NG
NG
– Continued on page 24 –
STR-DN1050
24
Flow of Repair (when sound is not outputted) (4/5)
Check that the sound from the HDMI
input is outputted.
Perform the “SOFTWARE VERSION
DISPLAY MODE” (refer to pa
ge 17
on the original service manual), and
check that the video micro-processor
version is not “0.00”.
Check that voltages of the connector pins
on the DIGITAL board are the following value.
DIGITAL board:
CN1501 pin 3 : +4V
CN1501 pin 5, 6 : +6V
CN1501 pin 7 : +4.5V
CN1501 pin 8 : +4.24V
CN1501 pin 9, 10 : +2.4V
CN1501 pin 11, 12 : +2.5V
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DCDC board: IC1905, IC1906, IC1907,
IC1908, IC1909, IC1910, F940, F941
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: IC3506
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: IC2100, IC3001
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: X3000
Check that voltage of the following pin is 3.3 V,
1.3 V.
DIGITAL board: IC3506
pin18 : 1.2V ~ 1.3V
pin112: 3.3V(VOUT)
pin173: 3.3V
Check that voltage of the following pin is 3.3 V.
DIGITAL board: IC3000
pin57: 3.3V(RESET)
Check that the X3000 on the DIGITAL board is
oscillated normally.
Check the following parts and the surrounding
circuit, and exchange the defective parts.
DIGITAL board: IC3000
– Continued on page 25 –
OK
OK
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NG
NG
NG
NG
NG
OK
OK
OK
OK
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