Motorola Astro XTL 1500 User Manual

June 15, 2005 6815854H01-A
5-36 Troubleshooting Charts: Flowcharts
5.6.25 TX or RX VCO Unlock (Fail 001) (380–470 MHz and 450–520 MHz)—Part 2 of 2
Figure 5-27. TX or RX VCO Unlock (Fail 001) (380–470 MHz and 450–520 MHz)—Part 2 of 2
Check 3 Volt
supply path from
Regulator U5750
Check 3 Volt
supply path
Check 3 Volt
supply path
Refer to Chart to determine
which AUX output determines
active VCO.
3VDC
at pin 5 of
U5750?
No
Check 5 Volt
supply path from
regulator U0505
Unlock
RX or
TX?
TX
RX
Yes
Required
Aux pins
at 3.0VDC
for RX?
No
No
Yes
Check
U5752
Check U5753,
Q5708, Q5709,
and Q5710
Yes
Required
Aux pins
at 3.0VDC
for TX?
No
No
Yes
Check
U5752
Check
U5753, Q5706,
and Q5707
3.0VDC at
E6750?
3.0VDC at
E6750?
Yes
A

Motorola Astro XTL 1500 Specifications

General

Brand	Motorola
Model	Astro XTL 1500
Category	Radio
Language	English