Troubleshooting Flow Chart For Receiver (Sheet 2 Of 2) - Motorola CM140 Service Information

Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)

Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

1.1
Go to
DC Section
Check
the component
Antenna to Mixer
circuitry problem
Replace
Q303, Q301
Check passive
components
Go to DC Section
From
A
No
3V
Yes
(IFIC -Vcc)
OK ?
No
Yes
Installation
OK ?
RF
No
Yes
Power
> -28 dBM
?
Replace
Q305, Q300, U302
Check passive
components
Replace Y301
No
3V to
U301
OK
?
Check visually
all receiver
components
installation ?
Inject - 40dBm (CW)
to RF connector
Check Power on
C335 (UHF) C332 (VHF)
Check Power on
C337 (UHF),
C336 (VHF)
No
No
Yes
Y301
OK
?
Yes
Replace U300
RF
Yes
Check Y301
Power
44.395 MHz
> -28 dBM
?
Replace Q302, Y300
Check D301 - 304
3-3