Motorola MTM800 User Manual

TROUBLESHOOTING CHARTS: 450-470MHz 9.1 - 9
Transmitter Audio Troubleshooting
Check components and connections
between U0201 pin 13 and accessory
connector pin 2
0V DC at
U0201 pin 10
?
Check
transistor
Q0201
Failure:
No audio, low audio level or distortion > 2% at speaker output during
transmitter audio test.
PATS parameters AUD_LBACK_GAIN or AUD_LBACK_DIST failed
If receiver audio has not been checked, go to Receiver Audio Chart first.
Connect the speaker output on the radio's accessory connector via testbox
RLN4460B to the audio input on the IFR.
Connect the microphone input on the radio's accessory connector via testbox
RLN4460B to the audio output on the IFR.
Setup IFR to:
No System,
AF Test,
AF IN/OUT,
Gen 1 On,
AF 1 Frequency 1kHz
AF 1 Level 80mV
Distortion On
Run Tetra Com script for TX audio test
Measure the 1kHz audio signal with a scope
Tetra Com Script for TX Audio Test
TEST_ENTER
DELAY 18
Check for "Radio HW is READY"
MODE IDLE
GEN_TONE OFF
DSP_LOOP ON
DSP_VOL 0
V
OL_M 24
MICGA_M 27
MIC PHF
SPKR INT
Start
Yes
Yes
No
No
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
1kHz signal at
U0201 pin 14
?
1kHz signal at
U0201 pin 13
?
1kHz signal at
U0201 pin 15
?
1kHz signal at
U0206-4 pin 14
?
1kHz signal at
FL0200 pin 17
?
Replace FL0200
9.3V DC
at U0201 pin 11
?
Check stage
U0206-4
Check
transistor
Q0201
Replace
U0201
Before replacing U0203
check R0220, R0225,
C0221 and 3V DC at pin 8
Check stage
U0206-4
6866539D31.book Page 9 Tuesday, March 20, 2007 6:32 PM

Motorola MTM800 Specifications

General

Brand	Motorola
Model	MTM800
Category	Handhelds
Language	English