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PSR-E433/PSR-I455
DMLCD CIRCUIT BOARD CHECK METHOD
The DMLCD Circuit Board is provided with test points for service check purposes.
Check the test points on the DMLCD Circuit Board if the following symptoms appear.
Symptoms and check items
1 No LCD display with Power SW ON --> Check items
②
to
⑥
sequentially
2 No sound or distorted sound --> Check items
①
,
⑦
and
⑧
Test Point
NO.
Test Point
Circuit
Judgment criteria
Measured by
Parts with possible defects
①
+5A
5 V power for analog circuit
5V±0.2V
Multimeter
IC201 (On AMJK Circuit Board)
②
+5D
5 V power for digital circuit
5V±0.2V
Multimeter
IC201 (On AMJK Circuit Board)
③
+3.3D
3.3 V power for digital circuit
3.3V±0.1V
Multimeter
IC801
④
+1.8D
1.8 V power for digital circuit
1.8V±0.1V
Multimeter
IC203
⑤
RESET
CPU & memory reset signal
3.3V±0.3V
Multimeter
IC111
⑥
+B
Battery voltage detection
11V±1V
Multimeter
R262 or TR201 (On AMJK Circuit Board)
⑦
DAC-L
DAC output L channel
There shall be audio output without
distortion.
Signal Checker
IC002 or IC005
⑧
DAC-R
DAC output R channel
There shall be audio output without
distortion.
Signal Checker
IC002 or IC005
Note: Use the standard AC adapter PA-150A or PA-150 for check operation.
DMLCD Circuit Board
PSR-E433 (WZ268000), PSR-I455 (ZC962700)
Component side
YD972C0
>
.
:
=
;
B
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2