Motorola GP360 Series Service Information - Page 23
Browse online or download pdf Service Information for Portable Radio Motorola GP360 Series. Motorola GP360 Series 32 pages. Professional radio, power distribution and controller
Also for Motorola GP360 Series: Specification Sheet (2 pages), Basic User's Manual (18 pages), Operating Instructions (4 pages), Service Information (30 pages), Service Information (30 pages)
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1.0
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
A
START
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
A
udio
at pin 27 of
U301?
No
Spray of inject 1st IF into
XTAL Filter
IF Freq: 45.1MHz
Yes
Audio
B
heard?
No
Check 2nd LO Control Voltage at C363
Yes
VCO
B
locked?
No
16.8 MHz
Yes
at pin 22
U301?
No
Check FGU
TROUBLESHOOTING CHARTS
Yes
Check Controller
Before replacing U301, check 2nd
VCO Q320. Check VCO O/P level,
Chapter 3
A
Check Q320 bias
circuitry for faults.
Rotate Freq. Knob
Activity
No
on U301
LVZIF_SEL
pin?
Yes
Check controller
C351, C352.