TM 55-4920-429-13
a. Set the METER SOURCE switch to CPT MONITOR.
b. Set the CPT MONITOR switch to LATERAL.
c. Connect a jumper wire between J l-i and J l-H. Connect a jumper wire between J l-AA and J l-g.
Connect a jumper wire between J1-K and J1-y.
DIGITAL
DIGITAL
MULTIMETER
LCT
MULTIMETER
CONNECTION
SWITCH POS.
READING
d. Connect the 10 volt ac power supply between J1-i (line) and J1-AA.
e. Connect the 6 volt ac power supply between J1-K (line) and J1-AA.
f. Adjust test aid circuit connected to receptacle pins J1-i (line) and J1-H to 10 volt ac.
g. Adjust test aid circuit connected to receptacle pins J1-K (line) and J1-y to 6 vat. The dmm shall
indicate +9 vac to +11.
h. Set the CPT MONITOR switch to LONGITUDINAL. The dmm shall indicate -3.6 to -4.4.
i. Set the CPT MONITOR switch to DIRECTIONAL. The dmm shall indicate -5.4 to –6.6.
j. Disconnect the test setup.
4-35. Actuator Drive Test. This test ensures that the actuator drive circuits and feedback monitor
circuits to dmm function as required. (See FO-8 for connector pin patterns.)
a. Test actuator drive circuits as follows:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Connect digital multimeter, set to measure ac volts to receptacle pins J3-E (line) and J3-C.
Set the CCDA switch to CCW. Multimeter shall read 2.0 to 3.0 volts ac.
Set the CCDA switch to CW. The multimeter shall read 2.0 to 3.0 volts ac.
Set the CCDA switch to OFF. The multimeter shall read 0 volt.
Disconnect the multimeter.
Connect the multimeter, set to measure dc volts, across receptacle pins J3-HH (+) and J3-C.
Set the DASH switch to RETR. The multimeter shall read +1 to –1 volt dc.
Set the DASH switch to EXT. The multimeter shall read +26 to +30 volts dc.
Set the DASH switch to OFF. The multimeter shall read 0 volt.
(10) Disconnect the multimeter.
(11) Connect a digital multimeter, set to read dc volts, to the pins listed below. Set the LCT switch
to the position listed. The multimeter shall read the voltage listed.
J1-S (+) ToJ1-C
E X T
+26 To +30 Vdc
J1-S (+) ToJ1-C
RET
0 Vdc
J1-S (+) ToJ1-C
OFF
0 Vdc
J1-T (+) ToJ1-C
RET
+26 To +30 Vdc
J1-T (+) ToJ1-C
E XT
0 Vdc
J1-T (+) ToJ1-C
OFF
0 Vdc
4-25
