Motorola ASTRO XTS 3000 User Manual

10-31
Chart 31. VHF/UHF Voltage Controlled Oscillator (VCO)
VCO TX/RX UNLOCK
Check
VDC at
C246
(VCTRL)
VDC
13V/0.7V/
Drifting
?
4.6V at
Collector
of Q202?
Replace
U201
For VHF
check L217.
If OK
replace
U201.
Power at
collector of
Q202?
Voltage
at U204
Pin 21?
Check
U204
0.1V at
U201
Pin 7?
Is L207
(UHF) 208/209/
210/219
open?
0.7V at
U201 Pin
5?
Is
C235-C241,
CR207 (UHF)
CR201
open
Replace components & go
to -VEE crossover freq.
tune procedures Chart
C.39 except if L208, L209
are changed.
Check L205 &
R220. If no fault
found, replace
U201.
3.3V
@ C211?
Check
L221 &
U204
Check
R203, R204,
R205, R209,
& Q202
Replace
U201
Replace
U201
Replace
U201
Replace
U201
Check
L221 &
U204
4.4V at
U201 Pin
5?
Is
C219, C220,
C222, C223,
C226, C227,
C270, CR203
open
0.1V at
U201
Pin 14?
Is
L215, L216,
L211, L213,
open
UHF?
Voltages
at U201 pins
11 and 12
ok?
Voltages
at Q203
ok?
Check
R209, R206,
R217, R219
& R210
Check
R206, R217,
R219, R210,
R203, if ok
replace Q203
Replace components & go
to -VEE crossover freq.
tune procedures. Chart
C.39 except if L213, L215
are changed.
NOTE: If C240 is found
defective, change to 2.7PF (VHF)/
2.4PF (UHF1)/2.4PF (UHF2)
*
RX
ONLY
TX
ONLY
NOTE: If C240 is found
defective, change to 2.7PF (VHF)/
2.4PF (UHF1)/2.4PF (UHF2)
*
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
TX
RX
NO NO
NO NO NO NO
NO
NO NO
YES
**
MAEPF-24387-O
NO
NO

Motorola ASTRO XTS 3000 Specifications

General

Brand	Motorola
Model	ASTRO XTS 3000
Category	Radio
Language	English