Motorola GP380 Series Service Information - Page 17
Browse online or download pdf Service Information for Two-Way Radio Motorola GP380 Series. Motorola GP380 Series 24 pages. Professional radio, power distribution and controller
Also for Motorola GP380 Series: Specifications (2 pages), Service Information (32 pages), Service Information (30 pages), Service Information (31 pages), Service Information (30 pages)
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1.0
Receiver (Sheet 1 of 2)
B
B
A
START
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
Audio at
pin 27 of
U303?
No
Spray of inject 1st IF into
XTAL Filter
IF Freq: 109.65 MHz
Yes
Audio
heard?
No
Check 2nd LO Control
Voltage at C308
Yes
VCO
locked?
No
17.0 MHz
Yes
check at pin
22 U303?
No
Check FGU
TROUBLESHOOTING CHARTS
Yes
Check Controller
Check controller.
Chapter 3
A
Check Q301 bias
circuitry for faults.
Rotate Freq. Knob
Activity
No
on U303
sel pin?
Yes
Before replacing U303, check 2nd
VCO Q301. Check VCO O/P level,
C315, C316.