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PSR-S750/PSR-S950
PSR-S750 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 8 sequentially
w
No sound or distorted sound --> Check items 1, 9 and 10
Test Point
NO.
Test Point
Circuit
Judgment criteria
Measured by
Parts with possible defects
1
+16V
Power supply for DM circuit
board
More than 14.0V
Multimeter
FT1 or TH1 (On AJACK Circuit Board)
2
+12A
12V power for analog circuit
12.0V±0.5V
Multimeter
IC1 (On AJACK Circuit Board)
3
+5 NOFUSE
5V power for digital circuit
5.0V±0.2V
Multimeter
IC502
4
+5D
5V power for digital circuit with
protect device
5.0V±0.2V
Multimeter
TH500
5
+3.3D
3.3 V power for digital circuit
3.3V±0.1V
Multimeter
IC502
6
+1.5D
1.5V power for analog circuit
3.3V±0.1V
Multimeter
IC7
7
+1.2D
1.2V power for digital circuit
1.2V±0.1V
Multimeter
IC1
8
RESET
CPU & memory reset signal
3.3V±0.3V
Multimeter
IC4 or IC5
9
DAC-L
DAC output L channel
There shall be audio output without
distortion.
Signal Checker
IC508, IC509 or IC504
10
DAC-R
DAC output R channel
There shall be audio output without
distortion.
Signal Checker
IC508, IC509 or IC504
Note1: Use the standard AC adapter PA-300C for check operation.
Note2: It measures by opposite DGND except special notes.
DM Circuit Board (WZ353700)
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 ...