Sony STR-DN840 (serv.man2) Service Manual ▷ View online
SERVICE MANUAL
1
SUPPLEMENT-1
Subject: Addition of SERVICING NOTES (TROUBLESHOOTING)
File this supplement with the service manual.
STR-DN840
Ver. 1.1 2013.05
9-890-617-81
US Model
Canadian Model
AEP Model
UK Model
Australian Model
Mexican Model
Taiwan Model
STR-DN840
2
SECTION 1
SERVICING NOTES
TROUBLESHOOTING
Flow of Repair (when sound is not outputted) (1/5)
NG
START
OK
OK
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
NG
OK
OK
OK
NG
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 3 –
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.
1. Check the R2140, R2141 Short or Open circuit? 2. Check Main Board +7 V Regulator.
Check that voltage of the follow pin 2.8 V. Digital Board: IC2100 Pin 99 (Fuse_Det)
Check that the “PROTECT” is not displayed on the fluorescent indicator tube.
Check that voltage of the follow pin 0.6 V. Digital Board: IC2100 Pin 67, 68
(Temp_Sensor_1&2)
Check that voltage of the following pin is 3.3 V. DIGITAL board: IC2100 pin 92 (PROTECT)
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
page 14 on the original service manual).
Check the IC2100 on the DIGITAL board and the surrounding circuit, and exchange the defective parts.
Check the surrounding circuit, 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, 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 of power transistor (example: Q600 on the MAIN board) and the surrounding circuit of power amplifier IC (example: Power Amplifier on the MAIN board), and exchange the defective parts.
Check the R2115, R2134, C2164, C2165, Short to Gnd? TH251, TH252
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 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.
STR-DN840
3
Flow of Repair (when sound is not outputted) (2/5)
NG
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
– Continued on page 4 –
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, 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”.
Check that data is outputted from the following pins. DIGITAL board: IC2107 pin 16, 19, 20, 21
Check that sound occurs from the RY921 on the MAIN board by inserting and removing headphone.
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, and exchange the defective parts.
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 voltage of pins of the IC2502 on the DIGITAL board is the following value. pin 4: 1.12 V pin 8: 3.3 V
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: IC2105, IC2806, X2801
Check the following parts and the surrounding circuit, and exchange the defective parts. DIGITAL board: IC2500 DCDC board: IC1902, IC1903
STR-DN840
4
Flow of Repair (when sound is not outputted) (3/5)
NG
NG
NG
OK
OK
OK
OK
OK
NG
NG
– Continued on page 5 –
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 DIGITAL board: IC2107
Check that “COAX” is displayed on the fluorescent indicator tube.
Check that “OPT” is displayed on the fluorescent indicator
Check the following parts and the surrounding circuit, and exchange the defective parts. DIGITAL board: IC2104
Check the following parts and the surrounding circuit, and exchange the defective parts. MAIN board: IC400, J401, J402
Check that the sound from the coaxial input is outputted.
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”.
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