PSR-S750/PSR-S950
76
PSR-S950 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
q
No LCD display with Power SW ON --> Check items 1 to 4 sequentially
w
No sound or distorted sound --> Check items 1, 5 and 6
Test Point
NO.
Test Point
Circuit
Judgment criteria
Measured by
Parts with possible defects
1
5V
5V power for analog circuit
5.0V±0.2V
Multimeter
IC804
2
1.5V
1.5V power for digital circuit
3.3V±0.1V
Multimeter
IC619 or IC620
3
1.2V
1.2V power for digital circuit
1.2V±0.1V
Multimeter
IC208
4
RESET
CPU & memory reset signal
3.3V±0.3V
Multimeter
IC4
5
OUT-L
DAC output L channel
(AUX OUT)
There shall be audio output
without distortion.
Signal Checker
IC801or IC807
6
OUT-R
DAC output R channel
(AUX OUT)
There shall be audio output
without distortion.
Signal Checker
IC801or IC807
Note1: Use the standard AC adapter PA-300C for check operation.
Note2: It measures by opposite DGND except special notes.
DM Circuit Board (WZ493400)
Component side
Summary of Contents for PSR-S750
Page 41: ...41 PSR S750 PSR S950 Pattern side 2NA WZ35370 1 DM Circuit Board PSR S750 ...
Page 43: ...43 PSR S750 PSR S950 Pattern side Scale 90 100 DM Circuit Board PSR S950 2NA WZ49340 1 ...
Page 45: ...45 PSR S750 PSR S950 Scale 90 100 Pattern side AJACK Circuit Board 2NA WZ43510 2 ...
Page 47: ...47 PSR S750 PSR S950 PNM Circuit Board Pattern side Scale 70 100 2NA WZ50830 1 ...
Page 48: ...PSR S750 PSR S950 48 PNS Circuit Board Component side WR 315 1 WR 31 1 WR 310 1 2NA WZ50830 1 ...
Page 49: ...49 PSR S750 PSR S950 Pattern side PNS Circuit Board 2NA WZ50830 1 ...