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Motorola HT Series User Manual

Motorola HT Series
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8-52 Maintenance: 900 MHz Troubleshooting Charts
8.17 900 MHz Troubleshooting Charts
8.17.1 Troubleshooting Flow Chart for Controller (Sheet 1 of 2)
Audio at
Pin E4
U851?
Press PTT. Red
LED does not light
up.
PTT U409
Pin 53
low?
Press PTT
Q502-2 High?
Check
PB504.
Check
Q502-2
voltage.
LED
Q502,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
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
Audio PA (U420)
input
(C447).
Audio from Pin 41
ASFIC, U404?
Check ASFIC
U404.
Check
Audio PA
(U420).
Check U351
LV ZIF.
Audio at
Pin 2
U404?
NO
NO
YES
YES
YES
NO
YES
Audio from Pin F4,
HC, U851?
Check HC
U851.
YES
NO
NO
YES

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Motorola HT Series Specifications

General IconGeneral
BrandMotorola
ModelHT Series
CategoryTwo-Way Radio
LanguageEnglish

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