Radio Frequency Circuit Troubleshooting; 26Mhz System Clock Fail - Motorola C168 Manual

1.2 Radio Frequency circuit troubleshooting

1.2.1 26MHz System clock fail

No 26MHz clock
Check if U601 Pin 5 is
2.8V
Yes
Check U606 Pin 1
or U606 Pin 3 If
26MHz Sine wave
exists
Yes
Check U604 Pin 8 If
26MHz Sine wave
exists
No
No Defective U606
No Replace U604
Fault Finding chart of 26MHz clock part
Check if U601 Pin 1
No
> 3.2V
Yes
Check if U601 Pin 3
No
> 2.8V
Yes
Defective U602
(voltage regulator)
Check Battery Cell is
empty ?
Defective U201 or
U202
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