Motorola GP380 Series Service Information - Page 24
Browse online or download pdf Service Information for Portable Radio Motorola GP380 Series. Motorola GP380 Series 30 pages. Professional radio, power distribution and controller
Also for Motorola GP380 Series: Specifications (2 pages), Service Information (32 pages), Service Information (24 pages), Service Information (31 pages), Service Information (30 pages)
Print Page
3-2
2.0
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
B
Inject RF into J3501
IF Signal
at C3200?
No
RF
Signal
at T3301
?
No
RF
Signal
at R3313
?
No
RF
Signal
at C3306
?
No or
weak RF
RF
Signal
at C3302
?
No
Check harmonic filters L3531 & L3532,
C3532 and ant. switches D3521, D3551,
L3551, R3551,C3551, C3552, L3552.
Trace IF signal
Yes
from C3200 to
Q3200. Check for
bad XTAL filter.
Yes
1st LO O/P
OK?
Locked?
Check T3301, T3302, CR3301,
Yes
R3321, R3322, R3320
Yes
Check filter between
C3313 & T3301.
Yes
Check RF amp
(Q3302) Stage.
Check filter between
Yes
C3302 & C3306; program
filter to schematic test freq
and check varactor
voltages.
No
Check FGU
Are
varactor
voltages
OK
?
No
Check U404 voltage. U404
can be selected by MCU
before replacing U404.
TROUBLESHOOTING CHARTS
Q3200
collector OK?
Yes
IF signal
present?
Before replacing
U3220, check
No
U3220 voltages;
trace IF signal
Yes
Check for 2.9
VDC
No
Is R5
Yes
present
?
No
Check Q3721, U3701
(pin 48) voltages
and U3711
Yes
Check varactor filter.
path.
A
A