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Motorola HT Series User Manual

Motorola HT Series
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Maintenance: Low Band Troubleshooting Charts 8-35
8.13 Low Band Troubleshooting Charts
8.13.1 Troubleshooting Flow Chart for Controller
MCU Check
Power Up
Alert Tone
OK?
Speaker
OK?
U409 EXTAL=
7.3728 MHz?
U205 Pin 19
17.0 MHz
5V at U204?
3.3V at U400?
U409 Reset Pin
94 High?
MCU is OK
Not able to
program RF
Board ICs
Before replacing
MCU, check SPI
clock, SPI data,
and RF IC select
Replace
Speaker
Read Radio
OK?
Check
Setup
Reprogram the
correct data.
See FGU
Troubleshooting
7.5V at
Pin 5 U204?
7.5V at Pin 8
U400
Check
Q400
Replace
U204/U400
Check any short
to SWB+,
Vdda or Vddd
Press PTT. Red
LED does not
light up
PTT U409
Pin 53
low?
Press PTT
CR502-2
High?
Check
PB504
Check
CR502-2
voltage
LED,
CR502,R501
OK?
Replace
Faulty
Component
Check
Accessories
J403
OPT_SEL_1 &
OPT_SEL_2
Pin 8 & 9
low?
Radio could
not PTT
externally
U409
Pin 52, 6
low?
See FGU
Troubleshooting
chart
LED should
light up
Check
MCU
PTT
NO
YES
YES
No
No
NO
YES
YES
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
EXT
SPKR
EXT
PTT
INT
AUDIO
J403 Pin 9 low?
Pin 8 high?
ASFIC U404
Pin 14 & 15
high?
Check
Accessories
Check
U404
Check
U420 Audio PA
NO
NO
YES
YES
J403 Audio
at Pin 2 &
Pin 3
Check Spk. Flex
Connection
Audio at
AudioPA
(U420)
input
Audio from Pin 41
ASFIC, U404?
Check
ASFIC U404
Check
Audio PA
(U420)
Check
U303
LV ZIF
Audio at
Pin 2
U404?
NO
NO
NO
YES
YES
NO
YES

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Motorola HT Series Specifications

General IconGeneral
BrandMotorola
ModelHT Series
CategoryTwo-Way Radio
LanguageEnglish

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