Sony TA-ZH1ES, Руководство по обслуживанию, Страница: 25 / 108

TA-ZH1ES
25
2. Sound is not outputted from the headphone
Sound is not outputted from the
headphone.
Yes
Insert the headphone plug all the way.
The headphone plug is inserted all
the way (with detection switch of the
headphone plug).
No
Yes
Replace the POWER SUPPLY board
to new board.
The condition does not change even
after connecting the new POWER
SUPPLY board to the DIGITAL
board.
No
Yes
There are no problems with the
connection of the DSP board and
DIGITAL board.
The LEDs (D3000, D3001) on the
DSP board are flashing. (If the
flashing, data is coming. Problem
point is the amplifier side)
No
Yes
Yes
Yes
The LEDs (D3000, D3001) on the
DSP board do not flash even after
correctly reconnecting the DSP
board and DIGITAL board.
No No
Yes
Yes
CL3039 (DSP1_OUT_DATA) on the DSP
board is measured with an oscilloscope
and a waveform is outputted.
Yes
Refer to the following flow for each input signal.
‡ No sound from WALKMAN (micro USB) input
(page 28).
‡ No sound from USB-B input (page 29).
‡ No sound from COAX IN and OPT IN input (page 30).
‡ No sound (or low sound) from LINE IN input (page 31).
No
The LEDs (D3000, D3001) on the DSP
board do not flash even after replacing
the DSP board to new board.
Yes
No
Yes
Yes
Yes
No sound from all outputs.
No
Photo coupler (PH001 to PH010) on
the DIGITAL board conduct the
electricity.
No sound from both UNBALANCED-
1 (J5001 on the 3.5 JACK board)
and UNBALANCED-2 (J5050 on the
6.3 JACK board).
CN011 on the DIGITAL board is
correctly connected (check voltage
of relay).
The line transformer (T003, T004)
are not broken.
Yes
Replace the main power
transformer (T001) to new part.
The voltage of the main power
transformer (T001) is about
+20 V/-20 V.
CL302 on the DIGITAL board:
about -20 V
CL303 on the DIGITAL board:
about +20 V
No
No
No
Yes
Yes
Yes
Yes
– Continued on page 26 –
Complete to after replacing photo
coupler on the DIGITAL board not
conduct the electricity to new part.
No
Replace the line transformer (T003,
T004) on the DIGITAL board to new
parts.