If infinity is measured, the J-3514/U or the CX-13061/U is open.
If zero ohms is measured, measure continuity on the MT-1898 J14
pin L to pin A.
If zero ohms
is
measured
the
J-3514/U
or
the
CX-13061/U
is
shorted.
If the J-3514/U or the CX-13061/U is not open or shorted, the KY-
57 is bad.
d. Test procedure 70. If a short or open is found on the J-3514/U or
the CX-13061/U, disassemble the MT-1898.
Remove the CX-13061/U from the J-3514/U J3.
Measure continuity on the CX-13061/U P1 pin P to P2 pin A.
If infinity is measured, the CX-13061/U is open.
If zero ohms is measured, then measure continuity on the CX-
13061/U P2 pin A to pin G.
If zero ohms is measured, the CX-13061/U is shorted.
If the CX-13061/U is not open or shorted, the J-3514/U is bad.
31. A-RT CONTINUOUSLY KEYS (EPC STEP 29b).
a. Situation 17.
This indicates the commander RT keying circuit is
bad.
This symptom is caused by a short.
Trace the commander RT keying
circuit from the commander's C-2298 J-802 pin C on your system diagram and
identify the following possible bad items of equipment: commander's C-2298,
commander's CX-4723, and AM-1780.
b. General test procedures.
You must determine the type of test and
the location of the test points to identify the actual bad item of
equipment.
Troubleshooting technique for this type of defect is circuit
substitution.
c. Test procedure 71.
Disconnect the CX-4723 from the commander's C-
2298.
If the RT stops keying, the commander's C-2298 is bad.
If the RT does not stop keying, disconnect the CX-4723 from the
AM-1780 J504.
If the RT stops keying the CX-4723 is bad.
If the RT does not stop keying the AM-1780 is bad.
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