Vhf Controller (For Models With Pcb 8486473Z04) - Motorola GP360 Service Information

VHF Controller (for models with PCB 8486473Z04)

3.0 VHF Controller (for models with PCB 8486473Z04
INT
AUDIO
NO
J403 Audio
at Pin 2 &
Pin 3
YES
Audio from Pin 41
Check Spk. Flex
Connection
Check NO
U3220
IF IC
EXT
PTT
Radio could
not PTT
externally
OPT_SEL_1 &
OPT_SEL_2
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
Audio
at Audio PA
YES
(U420)
input
(U447)
PTT U409
Check
Audio PA
(U420)
YES
NO
ASFIC, U404?
Press PTT
NO
Audio at
Pin 2
U404?
YES
Check
LED should
ASFIC U404
light up
J403
NO
Check
Accessories
Pin 8 & 9
low?
U409
YES
YES
Pin 52, 6
NO
low?
Check
NO
Accessories
NO
Check
U404
MCU Check
light up
Power Up
Alert Tone
NO
Pin 53
low?
Check
PB504
YES
Q502-2
High?
No
U409 EXTAL=
Check
7.3728 MHz?
Q502-2
voltage
LED
YES
Q502,R501
OK?
U3701 Pin 19
16.8 MHz
No
Replace
Faulty
Component
5V at U3711?
3.3V at U3201?
Check
MCU
U409 Reset Pin
See FGU
Troubleshoot-
ing chart
MCU is OK
)
YES Not able to pro-
gram RF Board
OK?
ICs
NO
NO
Replace
Speaker
Speaker
OK?
YES
YES
Read Radio
OK?
NO
NO
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
2-3
Before replacing
MCU, check SPI
clock, SPI data,
and RF IC select
NO
Check
Setup
Reprogram the
YES
correct data.
See FGU
Troubleshooting
NO
Check
Q400
YES
Replace
U3711/U3201