Motorola MTX series Theory/Troubleshooting Manual

43
TROUBLESHOOTING FLOW CHART #5B
(800/900MHz Voltage Controlled Oscillator - VCO)
JEDI
Troubleshooting Chart
ISS.
REVISIO
CORRECTED AS MARKED
ILLUSTRATOR DATEENGINEERDATE PROGRAM DISK
DESCRIPTION
TECHNICAL PUBLICAT
DWG. NO.
LETTERING SIZE:
REQUIRES:
EDITOR DATECHECKERDATE
Illustrator
O
MAEP
SW
3/12/93
C68
VCO TX/RX Unlock
MAEPF-23445-O
NO
VDC
U205-9
VDC
U204-19
VDC
U204-20
VDC
U204-17
NO YES
Check Continuity
Between
U204-19 &
U205-9
YES NO NO
YES
5VDC
U205-3
777-825MHz
862-902MHz
Change U204
5VDC
U201-6
806-825MHz
896-902MHz
VDC
U201-3, 13
NO
YES
YES
NO
5VDC
U205-8
850-870MHz
935-941MHz
Measure
Freq.
U201-15
Measure
Freq.
U204-21
Refer to FGU
Chart #4B
VDC
U205-1, 7
Change U205
5VDC
U204-38
806-825MHz
896-902MHz
Check Continuity
Between
U204-38 & U201-6
Refer to FGU
Chart #4B
YES
NO
YES
NO NO
YESYESYESYES
NO
Check C253 if
OK Change U204
Refer to
Chart #3B DC
Check L204,
C211 if OK
Change U201
NO
JWB
3/22/93
NO

Motorola MTX series Specifications

General

Brand	Motorola
Model	MTX series
Category	Portable Radio
Language	English