Motorola HT Series Service Manual page 99
Professional series two-way portable radio
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Also See for HT Series:
- Service manual (146 pages) ,
- Detailed service manual (639 pages) ,
- Detailed service manual (96 pages)
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0DLQWHQDQFH 0+] 7URXEOHVKRRWLQJ &KDUWV
B
B
Check FGU
7URXEOHVKRRWLQJ )ORZ &KDUW IRU 5HFHLYHU 6KHHW RI
START
Bad SINAD.
Bad 20dB Quieting.
No Recovered Audio
Audio at
pin 27 of
U351?
No
Spray or inject 1st IF into XTAL
Filter.
IF Freq: 109.65 MHz
Yes
Audio heard?
No
Check 2nd LO Control
Voltage at R365
Yes
VCO locked?
No
16.8 MHz
No
check at pin
21 of U351?
Yes
A
Yes
Check Controller.
Check controller
A
Check Q350 bias cir-
cuitry for faults
Rotate Freq. Knob
No
Activity
on U351
pin 19?
Yes
Before replacing U351, check
2nd VCO Q350. Check VCO O/P
level, C385, C387
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