Troubleshooting Chart For Controller - Motorola GP344 Detailed Service Manual

TROUBLESHOOTING CHARTS
INT
AUDIO
NO
J403 Audio
at Pin 2 &
Pin 3
YES
Audio from Pin
Check Spk. Flex
41 ASFIC, U404?
Connection
Check NO
U3220
LV ZIF
EXT
PTT
Radio could
not PTT
externally
EXT
SPKR
J403 Pin 9 low?
Pin 8 high?
YES
ASFIC U404
Pin 14 & 15
high?
YES
Check
U420 Audio PA
PTT
Press PTT. Red
LED does not
light up
Audio at
YES
AudioPA
(U420) input
(U447)
PTT U409
Pin 53
Check
Audio PA
(U420)
YES
NO
Press PTT
Q502-2
NO
Audio at
Pin 2
Q502-2
U404?
voltage
YES
Check
LED should
ASFIC U404
light up
J403
NO
OPT_SEL_1 &
Check
OPT_SEL_2 Accessories
Pin 8 & 9
low?
U409
YES YES
Pin 52, 6
NO
low?
Check
NO
Accessories
Troubleshooting
NO
Check
U404
Figure 2-8 Troubleshooting Chart for Controller
MCU Check
Power Up
Alert Tone
NO
low?
Speaker
Check
PB504
YES
High?
No
U409 EXTAL=
Check
7.3728 MHz?
LED
YES
Q502,R501
OK? U3701 Pin
19 16.8 MHz
No
Replace
Faulty
Component
Check
MCU
U409 Reset Pin
94 High?
See FGU
chart
MCU is OK
YES Not able to pro-
gram RF Board
OK?
ICs
NO
NO
Replace
Speaker
OK?
YES
YES
Read Radio
OK?
YES
NO
NO
YES
5V at
7.5V at
NO
U3711?
Pin 3/5 U3711?
3.3V at
7.5V at Pin 1
U3201?
U3201
YES
YES
NO Check any short
to SWB+,
Vdda or Vddd
YES
2-9
Before replacing
MCU, check SPI
clock, SPI data,
and RF IC select
NO
Check
Setup
Reprogram the
correct data.
See FGU
Troubleshooting
NO
Check
Q400
Replace
U3711/U3201