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Psr-S750 Dm Circuit Board Check Method - Yamaha PSR-S750 Service Manual

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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
Power supply for DM circuit
1
+16V
2
+12A
12V power for analog circuit
3
+5 NOFUSE
5V power for digital circuit
5V power for digital circuit with
4
+5D
protect device
5
+3.3D
3.3 V power for digital circuit
6
+1.5D
1.5V power for analog circuit
7
+1.2D
1.2V power for digital circuit
8
RESET
CPU & memory reset signal
9
DAC-L
DAC output L channel
10
DAC-R
DAC output R channel
Note1: Use the standard AC adapter PA-300C for check operation.
Note2: It measures by opposite DGND except special notes.
Circuit
Judgment criteria
More than 14.0V
board
12.0V±0.5V
5.0V±0.2V
5.0V±0.2V
3.3V±0.1V
3.3V±0.1V
1.2V±0.1V
3.3V±0.3V
There shall be audio output without
There shall be audio output without
DM Circuit Board (WZ353700)
Measured by
Multimeter
Multimeter
Multimeter
Multimeter
Multimeter
Multimeter
Multimeter
Multimeter
Signal Checker
distortion.
Signal Checker
distortion.
PSR-S750/PSR-S950
Parts with possible defects
FT1 or TH1 (On AJACK Circuit Board)
IC1 (On AJACK Circuit Board)
IC502
TH500
IC502
IC7
IC1
IC4 or IC5
IC508, IC509 or IC504
IC508, IC509 or IC504
Component side
75

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  Also See for Yamaha PSR-S750

This manual is also suitable for:

Psr-s950