Pcb View; Troubleshooting - Casio DC-7500A Service Manual & Parts List

PCB VIEW

B1+
B2+

TROUBLESHOOTING

Before the following solutions will be done, save data if possible.
SYMPTOM
No power
No display at all or wrong display
D1
BZ1
D2
BZ2
R2
R3
C5
IC3
IC2 IC4
IC1
CAUSE
Battery shortage
Poor soldering of the power
supply circuit
Defective heat seal
Defective LCD
— 5 —
LSI
D3
Replace batteries
Resolder
Replace it
Replace it
R1
C3
C2
C1
XT
SOLUTION