P-105B/P-105WH
■
DM CIRCUIT BOARD CHECK METHOD
The DM Circuit Board is provided with test points for service check purposes.
Check the test points on the DM Circuit Board if the following symptoms appear.
Symptoms and check items
1. No light with Power SW ON
--> Check
items
①
to
⑥
sequentially
2. No sound or distorted sound
--> Check
items
①
,
⑥
and
⑦
, and OUTPUT check items.
OUTPUT
Note: Use the standard AC adapter PA-150A or PA-150U for check operation.
Note: “O” mark expresses normalcy and “X” mark expresses a failed state.
DM Circuit Board (WZ891700)
TEST POINT
NO.
SPEAKER OUTPUT
PHONES/
OUTPUT
AUX OUT
DAC-L/R
TEST POINT
Parts with Possible Defects
1
X
X
X
X
IC1
2
X
X
X
O
IC1 or Error Detect circuit drive
3
O
X
X
X
IC23
4
X
O
O
O
IC1, IC22 or HP JACK
5
O
X
O
O
IC33
6
O
O
X
O
IC32
NO.
Test Point
Circuit
Judgment Criteria
Measured by
Parts with Possible Defects
①
+B
Power supply for
More than 10.0V
Multimeter
TR2 or D18
DM Circuit Board
(On PNJK Circuit Board)
②
+5V
5V power for
5.0V ±0.2V
Multimeter
IC24
digital circuit
③
+3.3V
3.3V power for
3.3V ±0.1V
Multimeter
IC21
digital circuit
④
+1.2V
1.2V power for
1.2V ±0.1V
Multimeter
IC20
digital circuit
⑤
RES
CPU and Memory
3.3V ±0.3V
Multimeter
IC4
reset signal
⑥
DAC-L
DAC output
There shall be audio output
Signal checker
IC23
L channel
without distortion
⑦
DAC-R
DAC output
There shall be audio output
Signal checker
IC23
R channel
without distortion
①
②
③
④
⑤
⑥
⑦
P-105B/P-105WH/P-35B/L-85WH/LP-5AWH
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