Motorola GP series Manual - Page 9
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Also for Motorola GP series: Service Manual (26 pages), Service Information (24 pages), Service Information (31 pages), Service Information (43 pages), Service Information (30 pages), User Manual (16 pages)
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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
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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