Troubleshooting; Checkpoints By Error Mode - Samsung YP-R1 Service Manual

4. Troubleshooting

4-1 Checkpoints by Error Mode
Oscilloscope Setting Values
Voltage/DIV
TIME/DIV
4-1-1 If there is no power
Yes
Check that the clock on X403 and
X402 oscillates.
Samsung Electronics
Normal Voltage
800mV/DIV
100ms/DIV
/
4 5
 See the waveform and
No
the image in Fig. 4-2.
Faulty
24MHz 32.768KHz
400mV/DIV 400mV/DIV
100us/DIV 100ns/DIV
If there is no power
Charge the battery and
check that the power is on.
Check that the
firmware is upgraded.
(See 4-2 Upgrade Methods)
/
1
C316: 2.5V, C318: 1.2V, C303: 3.0V
Check the voltage.
6
Yes
Check CPU_RST - HIGH
R406 - LOW
Troubleshooting
Yes
No
Yes
No
Yes
/
2 3
No
 See the waveform and
the image in Fig. 4-1.
/
7
No
 See the waveform and
the image in Fig. 4-3.
A
B
4-1