Models With Pcb 8486458Z03 - Motorola GP Series Manual

2-2
1.2

Models with PCB 8486458Z03

INT
AUDIO
Audio at
NO
J403 Audio AudioPA
at Pin 2 & (U420)
Pin 3 input
(U447)
YES
Audio from Pin 41
Check Spk. Flex
ASFIC, U404?
Connection
Check NO
Audio at
U301
Pin 2
IF IC
U404?
Check
ASFIC U404
EXT
PTT
Radio could
not PTT
externally
J403
OPT_SEL_1 &
OPT_SEL_2
Pin 8 & 9
low?
EXT
SPKR
NO
J403 Pin 9 low?
Pin 8 high?
YES
NO
ASFIC U404
Pin 14 & 15
high?
YES
Check
U420 Audio PA
All manuals and user guides at all-guidesbox.com
PTT
Press PTT. Red
LED does not
light up
YES
NO
PTT U409
Pin 53
Check
low?
Audio PA
(U420)
YES
Check
NO
PB504
YES
Press PTT
Q502-2
NO
High?
No
Check
Q502-2
voltage
YES
LED
YES
LED should
Q502,R501
light up
OK?
No
Replace
Faulty
Component
NO
Check
Accessories
U409
YES
YES
Check
Pin 52, 6
MCU
low?
Check
NO
See FGU
Accessories
Troubleshoot-
ing chart
Check
U404
TROUBLESHOOTING CHARTS
MCU Check
Not able to pro-
YES
Power Up
gram RF Board
Alert Tone
ICs
OK?
NO
NO
Replace
Speaker
Speaker
OK?
YES
YES
U409 EXTAL=
Read Radio
7.3728 MHz?
OK?
YES
NO
NO
U201 Pin 19
Troubleshooting
16.8 MHz
YES
7.5V at
NO
5V at U247?
Pin 3/5 U247?
3.3V at U248?
4/3.3V at Pin 1
U248
YES
YES
NO Check any short
U409 Reset Pin
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
Reprogram the
correct data.
See FGU
NO
Check
Q400
Replace
U247/U248