c. Test procedure 67.
At the KY-57 audio connector, disconnect the CX-
13062/U.
Move the handset to the KY-57 audio connector.
While listening to KY-57 alarm beeps, key the handset.
If the alarm beeps do not stop and the R-442 call lamp does not
go off, the KY-57 is bad.
If the alarm beeps stop and R-442 call light goes off, the J-
3514/U or the CX-13062/U is bad.
d. Test procedure 68. To check the (for opens or shorts) CX-13062/U,
remove it from the J-3514/U J2.
Measure continuity on the CX-13062/U P1 pin C to P2 pin C.
If infinity is measured, the CX-13062/U is bad (open).
If zero ohms is measured, then measure continuity on the CX-
13062/U P2 pin C to pin A.
If zero ohms is measured, the CX-13062/U is shorted.
If infinity is measured, the CX-13062/U is not shorted.
If the CX-13062/U is not open or shorted, the J-3514/U is bad.
30. R-442 CIPHER SIGNAL PATH CIRCUIT.
a. Situation 16. When performing EPC step 45, the R-442 call lamp does
not light and no reception is heard. This indicates the R-442 cipher signal
path circuit is bad. This symptom is caused by an open or a short. Trace
the R-442 cipher signal path circuit and identify the following possible bad
items of equipment: KY-57, J-3514/U, and CX-13061/U (Figure 97. Issued as
adjunctive material.).
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 continuity
measurement.
c. Test procedure 69. Check the cipher input to the KY-57 by measuring
continuity from the MT-1898 J14 pin L to the CX-13061/U P2 pin A.
Remove the R-442 from the MT-1898 and remove the CX-13061/U from
the KY-57 RAD jack J3.
With a jumper wire, jumper, pin T to pin G of the CX-13061/U P2
(This will keep power ON in the J-3514/U).
Measure continuity at the MT-1898 J14 pin L to the CX-13061/U P2
pin A.
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