Casio KX-787, Service Manual & Parts List

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6. PW-PCB Assy
6-1. VCC3, VCC3-MD, VCC5, VCC7.5, EVCC3 Voltage check
1. Preparation
• AC adaptor or voltage regulator
• Multimeter
2. Adjustment procedure
Confirm the following voltages.
VCC3 (CP110) = 3.30
±
0.10 [V]
VCC3 -MD (CP115) = 3.30
±
0.10 [V]
VCC5 (CP125) = 5.00
±
0.15 [V]
VCC7.5 (CP130) = 7.50
±
0.50 [V]
EVCC3 (CP140) = 3.30
±
0.10 [V]
6-2. VCC15, VEE7.5 Adjustment
1. Preparation
• AC adaptor or voltage regulator
• Multimeter
2. Adjustment procedure
• Adjust VR135 so that VCC15 (CP136) = 15.0
±
0.10 V.
• Adjust VR136 so that VEE7.5 (CP135) = -7.5
±
0.10 V.