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1.0
UHF/ UHF2/ 800MHz Controller
1.1
All models except those 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
LV ZIF
U404?
Check
ASFIC U404
EXT
PTT
Radio could
not PTT
externally
J403
OPT_SEL_1 &
OPT_SEL_2
Pin 8 & 9
low?
EXT
J403
SPKR
NO
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
TROUBLESHOOTING CHARTS
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
Troubleshooting
chart
Check
U404
MCU Check
Power Up
Not able to pro-
YES
Alert Tone
gram RF Board
OK?
ICs
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
U409
NO
Check any short
Reset
to SWB+,
Pin 94
Vdda or Vddd
High?
YES
MCU is OK
Chapter 2
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