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15
7 Troubleshooting Guide
7.1.
System start circuit confirmation
System doesn't start even if the power button pushes.
Power-supply voltage
OK?
Start
IC1101 clock OK?
IC1101
PIN (82)
PIN (82)
X1101 NG
YES
CL10 Voltage 2.8V?
Refer to the power-supply voltage table
YES
IC102 or IC103 or IC1101 NG.
NRES confirmation
R525 or Q525 NG.
YES
The power button is pushed.
While pushing
CL29 Voltage GND?
CL28 Voltage 2.8V?
YES
NO
NO
NO
NO
NO
NO
IC512 (PIN2) or peripheral parts
YES
S620 NG
R525-R526 Voltage
2.8V?
YES
R526 or IC1101 NG.
PCNT confirmation
12MHz
Power OFF
Record mode
Play mode
2.8V
2.8V
2.8V
3.2V
0V
0V
0V
3.2V
0V
1.2V
1.2V
1.5V
0V
2.8V
2.8V
3.2V
0V
2.5V
0V
0V
0V
0V
0V
2.5V(At the zoom stereo)
0V
2.5V(At the stereo)
0V
0V
0V
2.8V - 2.4V
2.8V - 2.4V
3.2V - 2.8V
0V
2.8V
2.8V
3.2V
Speaker amplifier power supply
Flash memory power supply
Microcomputer power supply 2
Power supply for recording
Zoom stereo power supply
Stereo power supply
Power-supply voltage table
Main source of electrical power
USB power supply
Microcomputer power supply 1
C312
CL26
Measurement point
CL28
C473
QR470 (collector)
LB300
CL28
C531
LB701
IC504
IC503 / IC502
IC508 / IC509 / D502 / D503 / QR522 / QR526 / Q524
QR471
C701
QR471 (collector)
The main faulty point
Q520 / QR522 / QR526
IC405
QR470
USB communicate mode
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