Troubleshooting Chart 1-4, Tx Audio - Motorola MCS 2000 Service Instructions Manual

Troubleshooting Troubleshooting Chart 1-4, TX Audio

Troubleshooting Chart 1-4, TX Audio

START
45mVrms on
U0200-B8
TP5800 has
1KHz ~114mVrms
AC with ~2.5VDC
GOTO Band Specific
RF Transmitter
68P81083C20-D
1KHz
Check for solder defects
No
on U0200, C0218,
Yes
No
offset
Yes
Chart
Inj: 1KHz Tone, 80mVrms
R0224, R0233
at the Internal Microphone
Ref: TX Audio Simplified Schematic
~ = Approximately
SPI lines
Yes
activity at
U0200-E3, F1
No
SPI activity
No
on pins 66, 67
of U0103
Yes
Check
R0403, R0404,
R0405
Check
U0200 all bands,
U0250 for 900MHz
Check
U0103
MAEPF-25950-O
December 6, 2004
9-7