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Motorola CDM1250 Service Manual

Motorola CDM1250
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Section 10: 3-1
6881091C63-F
Chapter 3
TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Audio at
pin 8 of
U3101?
Check Controller
(in the case of no audio)
OR ELSE go to “B”
Yes
No
Spray or inject 44.85MHz
into XTAL Filter FL3101
Audio heard?
B
Yes
No
Check 2nd LO
(44.395MHz) at C3135
LO present?
B
Yes
Check voltages on
U3101
Biasing OK?
No
No
A
Yes
Check Q3102 bias
for faults
Replace Q3102
Go to B
Yes
No
Check circuitry
around U3101.
Replace
U3101 if defect
Check circuitry around Y3101.
Replace Y3101 if defect
Voltages
OK?

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Motorola CDM1250 Specifications

General IconGeneral
DisplayAlphanumeric
IP RatingIP54
Frequency RangeVHF: 136-174 MHz, UHF: 403-470 MHz
SignalingPL, DPL, MDC1200, Quick Call II
Operating Temperature-22°F to +140°F (-30°C to +60°C)
Power OutputVHF: 1-25W; UHF: 1-25W

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