Motorola HT1250-LS+ Service Manual page 46

4-10
B
Inject RF into J3501
IF Signal at
C3281?
No
RF Signal at
T3301?
No
RF Signal at
C3353?
No
RF Signal at
C3346?
No or
weak RF
RF Signal at
C3341?
No
Check harmonic filter L3531 & L3532,
C3532 and ant. switches D3521,
D3551, L3551 & associated compo-
nents.
Trace IF signal
Yes
from C3200 to
Q3200. Check for
bad XTAL filter.
1st LO
Yes
O/P OK? (+5
No
dBm at T3302
Pin 6?)
Locked?
Check T3301, T3302,
CR3301
Yes
Yes
Check filter between
Q3302 & T3301
Yes
Check RF amp (Q3302)
Stage.
Yes
Check filter between
C3341 & Q3302
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
Q3200 collec-
Check FGU
for 2.9 VDC
@ Q3200-C
Is 5V supply
Check U3711
Yes
tor OK?
IF signal
present?
Before replac-
ing U3101,
check U3101
No
voltages; trace
IF signal path
Check
Yes
No
Yes
present?
No
Maintenance
A
A