Sony STR-DN1040 Service Manual ▷ View online
17
STR-DN1040
SECTION 4
FM TUNER CHECK
FM AUTO STOP CHECK
signal
generator
set
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note:
Use 75 ohm coaxial cable to connect signal generator and the
set. You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Confi rm that input frequency of A, B and C are detected and
automatic scanning stops.
When the station signal is received in good condition, automatic
scanning stops.
scanning stops.
STR-DN1040
18
SECTION 5
TROUBLESHOOTING
Flow of Repair (when sound is not outputted) (1/5)
NG
NG
START
Check that the “PROTECT” is not displayed on the fluorescent indicator tube.
NG
NG
OK
NG
NG
NG
OK
OK
OK
OK
OK
NG
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 14 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 19 –
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 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-DN1040
19
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: IC1902, IC1903
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: IC400
Perform the “SOFTWARE VERSION DISPLAY
MODE” (refer to page 14 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: IC400
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 20 –
OK
NG
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
STR-DN1040
20
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: IC2351, IC2352, IC2806
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: IC400, 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 21 –
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