Motorola GP360 Service Information page 10

2-2
2.0 VHF Controller (except models with PCB 8486473Z04
INT
AUDIO
NO
J403 Audio
at Pin 2 &
Pin 3
YES
Check Spk. Flex
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
Press PTT. Red
LED does not
Audio at
AudioPA
YES
(U420)
input
(U447)
Check
Audio PA
(U420)
YES
NO
Audio from Pin 41
ASFIC, U404?
NO
Audio at
Pin 2
U404?
YES
Check
LED should
ASFIC U404
light up
J403
NO
OPT_SEL_1 &
Check
OPT_SEL_2 Accessories
Pin 8 & 9
low?
U409
YES
Pin 52, 6
NO
low?
Check
NO
Accessories
NO
Check
U404
MCU Check
PTT
light up
NO
PTT U409
Pin 53
low?
Check
PB504
YES
Press PTT
Q502-2
High?
No
U409 EXTAL=
Check
7.3728 MHz?
Q502-2
voltage
LED
YES
Q502,R501
OK?
U3701 Pin 19
No
Replace
Faulty
Component
5V at U3711?
3.3V at U3201?
YES
Check
MCU
U409 Reset Pin
See FGU
Troubleshoot-
ing chart
TROUBLESHOOTING CHARTS
Power Up
YES Not able to pro-
Alert Tone
gram RF Board
OK?
ICs
NO
NO
Replace
Speaker
Speaker
OK?
YES
YES
Read Radio
OK?
NO
NO
16.8 MHz
YES
7.5V at
NO
Pin 3/5 U3711?
7.5V at Pin 1
U3201
YES
NO Check any short
to SWB+,
94 High?
Vdda or Vddd
YES
MCU is OK
)
Before replacing
MCU, check SPI
clock, SPI data,
and RF IC select
NO
Check
Setup
YES
Reprogram the
correct data.
See FGU
Troubleshooting
NO
Check
Q400
YES
Replace
U3711/U3201