Sony UDA-1 Service Manual page 19

– From page 18 –
Check that voltage of the
following is "H".
AMP board: CL240 or
CN215 pin 1 (XAMUTE)
OK
Check the IC206 (electrical
volume IC).
Check that analog audio signal
is outputted from the following
pins.
AMP board:
C251, C252/IC206 pin 8, 25
OK
Check that power amplifier
voltage of the following is
about +25 V, –25 V.
AMP board: CL270, CL271
OK
Check that audio signal of
power amplifier is outputted
from the following pins.
AMP board: CN207
pin 1 (R), 4 (L)
OK
OK
Check that the harness is
NG
correctly inserted in CN215 on
the AMP board and CN303 on
the DIGITAL board.
Check that the harness is
NG
correctly inserted in CN215 on
the AMP board and CN303 on
the DIGITAL board.
Check that the fuses (F202,
NG
F203) on the AMP board are
not damaged.
OK
Check the following parts and
the surrounding circuit.
AMP board: D218
Check the T001 (main power
transformer)
Check that voltage of the
NG
following is "H".
AMP board: CN215
pin 6 (SP_RY)
Check that voltage of the
following is "L".
AMP board: CN215
pin 8 (HP_DET)
Check the following parts and
the surrounding circuit.
AMP board:
IC350 (R-ch), IC351 (L-ch)
NG
Reinsert the harness.
Repair the harness.
Check the following parts and
the surrounding circuit, and
exchange the defective parts
or board.
DIGITAL board: IC306
NG
Reinsert the harness.
Repair the harness.
Check the following parts and
the surrounding circuit.
AMP board: IC206, Q209,
Q210, Q213, Q214, Q216
NG
Exchange the fuses (F202,
F203) on the AMP board.
Exchange the defective parts.
NG
Repair the harness.
Exchange the DAC board and
AMP board.
UDA-1
NG
NG
19