Troubleshooting Charts; Troubleshooting Flow Chart For Controller - Motorola CDM Series Service Manual

Section 2

TROUBLESHOOTING CHARTS

1.0

Troubleshooting Flow Chart for Controller

RX
AUDIO
J0501
NO
at Audio PA
Audio at Pin
16 &
Pin 1
YES
NO
Check Spk. Flex
Connection &
Control head
Check NO
Receiver &
IF IC
EXT
PTT
Radio could
External PTT
not PTT
enabled with
externally
YES
Before troubleshooting the controller section
according to this chart please check the follow-
ing:
1. Check tuning and CPS settings
2. Check if Alert Tones are enabled
3. Check if Control Head is OK
4. Check board visually
PTT
Press PTT. No
RF Output
Power.
Audio
YES
(U0271)
input
Red LED
lights up?
Check
Audio PA
(U0271)
YES
Audio
YES
Check
at Pin 41
FGU &
U0221?
Transmitter
NO
Check Components
Audio at
between U0221 and
Pin 2
U0271
U0221?
YES
Check
ASFIC
U0221
NO
Enable External PTT
with CPS
CPS?
DC
at assigned
YES
Acc. Con.
Pin DC
changes?
NO
Check
Accessories
Controller
Check
Power Up
Alert Tone
OK?
NO
NO
Speaker &
Check
Control
Control
head OK?
head
YES
9.3V
DC at Pin 5
of U0641?
YES
5V DC at
Pin OUT of
U0651?
YES
U0101
EXTAL=
7.3728 MHz/
14.7456
MHz?
Check
Connection
YES
to µP port
BUS+
activity when
volume knob
rotated?
YES
MCU is OK
Chapter 3: 2-1
Before replacing
YES Not able to
MCU, check SPI
program
clock, SPI data,
RF Board ICs
and RF IC select
Replace
NO
Speaker /
Control Head
NO
Check U0641, Q0641,
Q0661, D0660 &
D0661
NO
Check U0651, D0651,
D0621
NO
NO
Check
U0221 Pin 34 =
FGU
16.8 MHz?
Reprogram the
YES
correct data. &
Check ASFIC
and MCU
NO
Check Control
head and MCU
(U0101, U0121,
U0122, U0111)
6881091C63-A