58
6881086C22-B
TRC Board DC Voltage Troubleshooting Chart
TRC TX Audio Troubleshooting Chart
Check AC source
is present and
that power supply
is functioning
No
Is
12.0V present
at J11-1?
Replace VR101
and check
for short in circuit
Yes
No
Is
5V present
at U131-3?
Replace 5V regulator
(U132) and check
for short in circuit
Is
5V present
at U132-2?
Set up for radio test,
be sure all connectors,
switches and jumpers
are in connect positions
Yes
Replace 9.6V
regulator (U100)
and check for
short in circuit
No
Is
9.6V present
on audio IC s?
Yes
No
Check for
correct operation
of U102 and replace
if necessary
No
Is
4.8V present
at audio IC s?
Yes
TRC BOARD DC VOLTAGE
START
START
START
START
START
START
STOP
Yes
MAEPF-26154-A
Set S100
correctly and
reset consolette.
Check that
HY2 is inserted
properly.
Check for
proper operation
of HY2 and replace
if necessary.
Remove drain
and source leads
of Q113.
Is 1kHz
signal present
at TP4?
Check that JU101
is installed and
U110 and U105 are
operating correctly.
Yes
No
No
Is 1kHz
signal present
at J1-23?
No
No
No
No
Yes
Inject a 440mVrms
1kHz signal into
the TX wireline.
Set up
radio for test.
Is signal
at TP1 0dBm
–1dB?
Yes
Yes
Yes
Check
P101 and U106.
No
Is 1kHz
signal present
at J3-46?
Check for proper
operation of U106
and U107 and
replace if necessary.
No
Is 1kHz
signal present
at J1-13?
Yes
Yes
Check U117
comparators for
correct operation.
Is
S100-4
off?
Is
voltage on C506
approximately
0VDC?
Yes
Check that U127,
U123, and U129 are
operating correctly.
Is
FILTER_CLOCK
a 0-5V square wave and
at 110.4kHz?
No
Replace
Q113.
Trace signal
from input
to find failure.
Is
signal present
at TP1 now?
Yes
2
2
3
5
4
1
1
1
1
2
3
4
5
NOTE;
To set up radio for test, be sure all connectors,
jumpers, switches, are configured appropriately.
Refer to manual for proper set up procedure.
TRC TX AUDIO
MAEPF-26157-O
STOP
START
Содержание ASTRO Digital Spectra
Страница 1: ...ASTRO Spectra Spectra Plus Consolette Instruction Manual ...
Страница 10: ...viii 6881086C22 B Notes ...
Страница 14: ...xii 6881086C22 B Consolette Installation Guidelines Notes ...
Страница 22: ...xx 6881086C22 B ASTRO Spectra Consolette Options Notes ...
Страница 26: ...Introduction Options 4 6881086C22 B Notes ...
Страница 40: ...Installation Remote Control Installation 18 6881086C22 B Notes ...
Страница 72: ...Cable Diagrams Optional Cables 50 6881086C22 B Notes ...
Страница 74: ...Diagrams and Parts Lists List of Schematics Boards and Parts Lists 52 6881086C22 B Notes ...
Страница 84: ...62 6881086C22 B Notes ...
Страница 85: ...6881086C22 B 63 Schematics Boards and Parts Lists ASTRO Spectra Consolette Exploded View MAEPF 27904 A ...
Страница 106: ...84 6881086C22 B Notes ...
Страница 110: ...88 6881086C22 B Appendix A Cross Patch Configuration Notes ...