Motorola MSF 5000 Instruction Manual page 217

MSF
5000
Instruction Manual
Chapter5
Troubleshooting
Troubleshooting Description
Failures After Alignment
Table 5-2
Failures After Alignment
Symptom
Probable Cause
Remedy
RX
front end is detuned Receiver
does not
unsquelch Realign
receiver; refer to
Chapter
4
-
Alignment
Receiver squelch
is too
tight
(EEPOT
3) Realign squelch
pot; refer to
Chapter
4
-
Alignment
Incorrect programmed squelch
Reprogram
via RSS
qualifiers
Station does not transmit
with
a Local
PTT
Faulty PA
Check and replace
PA
Power control problem Replace Uniboard
Faulty SSCB
Check and
replace
SSCB
Programming
error
Reprogram
via RSS
Station does not transmit
with
4a
RPT Faulty PA
Check and
replace
PA
PIT
Repeater squelch pot
(EEPOT
2)
Realign
RPTR
squelch pot adjustment;
improperly aligned
refer to
Chapter
4
-
Alignment
Incorrect programmed squelch
Reprogram
via RSS
qualifiers
Faulty SSCB Check
and replace
SSCB
Programming
error
Reprogram via RSS
Station does not transmit with
a
LINE Faulty PA
Check
and replace
PA
PTT
Programming error
Reprogram
via RSS
Frequency is off center Frequency is out of adjustment Realign Fo frequency adjustment;
refer
to
Chapter
4
-
Alignment
Faulty transmit or receive
VCO
Reference is not
fully
warmed up
Check and
replace
VCO
Faulty Uniboard Check and replace Uniboard
Power is not
at rated
power
Power adjustment incorrect
Realign per Chapter
4
-
Alignment
Overdrive trip point was
exceeded Reset trip point; realign power output
per alignment procedure
Thermal cutback has occurred Check and replace PA and antenna
Battery revert has occurred
Replace
AC
source
Adjust cutback control; refer
to
Chapter
4
-
Alignment
Faulty Uniboard
Check power
control circuitry and
replace Uniboard
Faulty PA Check
and replace
PA
PA Full
LED
is not
lit when
station is Overdrive trip point was met Reset
trip points;
refer to
Chapter
4
-
given
a
PA key
on
Alignment
Faulty PA Check
and replace
PA
Faulty power
control circuit on
Check
and replace Uniboard
Uniboard
68P81092E07
3/19/94
5-3
MSF
5000
Instruction Manual
Chapter5
Troubleshooting
Troubleshooting Description
Failures After Alignment
Table 5-2
Failures After Alignment
Symptom
Probable Cause
Remedy
RX
front end is detuned Receiver
does not
unsquelch Realign
receiver; refer to
Chapter
4
-
Alignment
Receiver squelch
is too
tight
(EEPOT
3) Realign squelch
pot; refer to
Chapter
4
-
Alignment
Incorrect programmed squelch
Reprogram
via RSS
qualifiers
Station does not transmit
with
a Local
PTT
Faulty PA
Check and replace
PA
Power control problem Replace Uniboard
Faulty SSCB
Check and
replace
SSCB
Programming
error
Reprogram
via RSS
Station does not transmit
with
4a
RPT Faulty PA
Check and
replace
PA
PIT
Repeater squelch pot
(EEPOT
2)
Realign
RPTR
squelch pot adjustment;
improperly aligned
refer to
Chapter
4
-
Alignment
Incorrect programmed squelch
Reprogram
via RSS
qualifiers
Faulty SSCB Check
and replace
SSCB
Programming
error
Reprogram via RSS
Station does not transmit with
a
LINE Faulty PA
Check
and replace
PA
PTT
Programming error
Reprogram
via RSS
Frequency is off center Frequency is out of adjustment Realign Fo frequency adjustment;
refer
to
Chapter
4
-
Alignment
Faulty transmit or receive
VCO
Reference is not
fully
warmed up
Check and
replace
VCO
Faulty Uniboard Check and replace Uniboard
Power is not
at rated
power
Power adjustment incorrect
Realign per Chapter
4
-
Alignment
Overdrive trip point was
exceeded Reset trip point; realign power output
per alignment procedure
Thermal cutback has occurred Check and replace PA and antenna
Battery revert has occurred
Replace
AC
source
Adjust cutback control; refer
to
Chapter
4
-
Alignment
Faulty Uniboard
Check power
control circuitry and
replace Uniboard
Faulty PA Check
and replace
PA
PA Full
LED
is not
lit when
station is Overdrive trip point was met Reset
trip points;
refer to
Chapter
4
-
given
a
PA key
on
Alignment
Faulty PA Check
and replace
PA
Faulty power
control circuit on
Check
and replace Uniboard
Uniboard
68P81092E07
3/19/94
5-3