(800/900Mhz Voltage Controlled Oscillator - Vco) - Motorola Handie-Talkie MTX Series Theory/Troubleshooting Manual

VCO TX/RX Unlock
VDC
NO
U205-9
YES
5VDC
U205-3
YES
777-825MHz
862-902MHz
NO
5VDC
U201-6
806-825MHz
896-902MHz
YES
VDC
U201-3, 13
NO
YES
Change U204
MAEPF-23445-O
TROUBLESHOOTING FLOW CHART #5B

(800/900MHz Voltage Controlled Oscillator - VCO)

VDC
NO
U204-19
YES
Check Continuity
Between
U204-19 &
U205-9
5VDC
U205-8
YES
850-870MHz
935-941MHz
NO
NO
VDC
YES
U204-20
NO
Refer to
Check C253 if
Chart #3B DC
OK Change U204
Measure YES
Freq.
U201-15
NO
Check L204,
C211 if OK
VDC
NO
Change U201
U205-1, 7
Refer to FGU
YES
Chart #4B
Change U205
5VDC
U204-38
NO
Refer to FGU
806-825MHz
896-902MHz Chart #4B
YES
Check Continuity
Between
U204-38 & U201-6
VDC
U204-17
NO
Measure
YES
Freq.
U204-21
NO
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