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Flow Chart of Troubleshooting
10-3
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10-1-2 : Abnormal initial operation (4.0V voltage source)
Press PWR KEY
C507 voltage
level=1.1~1.3V?
Check L501 and neighboring circuits
C555 voltage level
= 1.8V?
Check L505 and neighboring circuits
NO
NO
YES
YES
TR402 pin 4
output is asserted?
Check TR402 and neighboring circuits
NO
YES
U903 pin 4
output is asserted?
Check U903
and neighboring circuits
NO
YES
Freq = 19.2MHz
Vpp
≒
800mV
Check the clock generation circuit
(related to TCX201)
Check the initial operation
END
Check the clock signal at pin#2
of RTR6285(U201)
NO
YES
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