Trunking Tones Not Heard At Remote Console Troubleshooting Chart - Motorola ASTRO Spectra Instruction Manual

Monitor U123-38
during the time when
trunking tones should
be present
(on each push-to-talk).
Is a
0-5VDC signal
present at
U123-38?
2
Do the
No
trunking tones
Check/replace
appear at
U106.
R171?
3
2
Do the
trunking tones
appear at line 1
output?
STOP
6881086C22-B
START
Apply a Push-to-Talk
Yes
to the consolette Is S100-2
set to OFF?
on a trunking
channel.
1
Are
associating Is the
Yes No
trunking tones heard at
local speaker
the local consolette
connected?
speaker?
Yes
Check the
No
Check/replace programming of the
microprocessor. trunking channel in the
consoletteÕs codeplug.
Yes
1
START
Yes
No
Yes
TRUNKING/MDC TONES NOT HEARD
AT REMOTE CONSOLE
No Set S100
correctly
START
No Connect the
speaker.
1
Check for
No
proper operation
of U124.
Is
Check/replace Yes
WL_MUTE signal
U113 and U114.
high?
No
4
Determine why
U123 is holding
signal low and
repair.
4
Check VB, 9.6V and
Does the Is
No
FILTER_CLOCK signal,
signal appear 9.6V and VB
also, be certain HY2
at U114-13? present?
is inserted properly.
Yes Yes
4
Is
Does the
filter_clk signal
signal appear
a 0-5V square wave
at U114-14? at 110.4kHz?
Yes
Yes
5
Check 9.6V and VB,
Does the Check HY2 for
No also, evaluate
correct operation and
signal appear
operation of U111 and
replace if necessary.
at TP3?
position of R545 wiper.
Yes
6 5 3
Check 9.6V and VB;
Is
Does the
No No also, check for
signal appear at signal at
correct operation
U111-1?
line 1 output?
of U111.
Yes Yes
6
Is
Check/replace
signal at No
Q114 and/or
STOP
secondary of
Q115.
T100?
Yes
6
Check/replace
transformer.
6

Trunking Tones Not Heard at Remote Console Troubleshooting Chart

Refer to TRC
No
Board Voltage
Troubleshooting
Chart.
Check for
No
correct operation
of U127 and U123.
3
MAEPF-26159-O
57