
STR-DN850
13
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 14 –
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: IC421
Perform the “SOFTWARE VERSION DISPLAY MODE” (refer to pag
e 21
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: 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, 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, IC2107, X2102
Check the following parts and the surrounding circuit, and exchange the defective parts. DIGITAL board: IC2500 DCDC board: IC1907, IC1909
Содержание STR-DN850
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