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Page Title:
Table 5-1. MTS Test Aid Troubleshooting |
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 TM 11-7010-201-40-5/ET821-AA-MMI-050/E154 MTS/T O 31S5-2TSQ73-2-5
Table 5-1. MTS Test Aid Troubleshooting
Fault indication
Probable cause
Corrective action
Ohmmeter Checks
Ohmmeter checks do not give
Open or short in wiring, or SS or
Troubleshooting, repair wiring,
proper resistance readings.
BCP switch is not operating
and/or replace appropriate switch.
properly.
Main Tests
When power is applied, not all the
Wiring, lamp driver IC or
Perform lamp test and replace
X and Y address, TC, CK, card ID,
indicator is faulty.
indicator if necessary; or
state, and self-test indicators light.
troubleshoot, repair wiring, and/or
replace lamp driver IC
+ 5 0.5v is not present at JO1-256
Faulty wiring between red
Troubleshoot and repair wiring.
and J01-258.
binding post and J01-256 or JO1-
Binding post broken.
Repair/replace binding post.
+ 3.25 1.75v is not present at JO1-
Faulty wiring or quad two IC.
Troubleshoot, replace wiring, and/
108.
or replace quad two IC.
When SCP switch is pressed or
Quad two IC or SCP switch is
Replace SCP switch or quad two
released, there is a bounce in the
faulty.
IC.
voltage.
All indicators on front panel do not
Faulty wiring or LT switch is
Troubleshoot, repair wiring, and/or
light when LT switch is pressed.
not working.
replace LT switch.
One indicator on front panel does
Faulty wiring and/or bad
Troubleshoot, repair wiring, and/or
not light when LT switch is
indicator or diode array.
replace indicator or diode array.
pressed.
All indicators on front panel do not
Faulty wiring, inverter IC, lamp
Troubleshoot, repair wiring, and/or
light when DATA/FUNCTIONAL/
driver IC, switch SO1, or
replace inverter IC, lamp driver IC,
CONT switch SO1 is set to DATA.
resistor.
switch, or resistor.
Any of the indicators tested by the
Faulty wiring or lamp driver IC.
Troubleshoot, repair wiring, and/or
procedure of table 5-2 do not go off.
replace lamp driver IC.
Indicators 1 through 72 do not go
Faulty wiring, switch SO1, or
Troubleshoot, repair wiring, and/or
off when DATA/FUNCTIONAL/
lamp driver IC.
replace switch SO1 or lamp driver
CONT switch SO1 is set to
IC.
FUNCTIONAL.
Tested indicator does not light
Faulty wiring, inverter IC, or
Troubleshoot, repair wiring, and/or
when inverter input is jump wired
lamp driver IC.
replace inverter IC or lamp driver
to J01-259.
IC.
5-4
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