Motorola HT1250-LS+ - Sending and Receiving Call Alert Pages

Maintenance 4-11
START
No Power
Is There B+
Bias for Ant
switch
Check U3502 Pin 32
voltage, R3572-3,
etc.
Is
TX Cur-
rent nor-
mal?
Is Control Volt-
age High or Low
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is Power
OK?
Done
Check Drive to
Module
Is Drive
OK?
Troubleshoot
VCO
Inspect PA Network/
Check Power Out of
U3501 at Cap C3512
Is Power
OK?
Replace U3501
Is Power
OK?
Replace Q3501
Done
Done
No
Ye s
Ye s
No
No
Ye s
Low
High
No
Ye s
Ye s
No
Ye s
No
Troubleshooting Flow Chart for Transmitter