TM 55-4920-414-13&P
(7) Remove jumper lead between pins 1 and 3 of cable con-
nector J467R.
f. DC Power Supply Voltage Test.
(1) Connect digital voltmeter positive side to+ 15 vdc and
negative side to SIG GRD (front panel), using adapters and
leads.
(2) Set AC POWER switch to ON. Digital voltmeter will
indicate between 14.5 and 15.5 vdc. If not, perform
troubleshooting Table 4-8, see Troubleshooting Chart, trouble
No. 3, FO-3 and FO-1.
(3) Set AC POWER switch to OFF.
(4) Disconnect adapter and lead from +15 vdc and connect
to -15 vdc.
(5) Set AC POWER switch to ON. Digital voltmeter will
indicate between -14.5 vdc and -15.5 vdc. If not, perform
troubleshooting Table 4-8 and see Troubleshooting Chart, trou-
ble No. 3, FO-3 and FO-1.
(6) Set AC POWER switch to OFF.
(7) Connect cable W1 supplied with test box to connector
J3 (rear).
(8) Connect digital voltmeter positive side to pin 4 (at other
end of cable W1) marked to PITCH TRIM ACTUATOR, using
lead. Connect digital voltmeter negative side to SIG GRD, us-
ing lead and adapters.
Table 4-6. Position
(9) Set AC POWER switch to ON. Digital voltmeter will
indicate between 14.5 and 15.5 vdc. If not, perform
troubleshooting Table 4-8 and FO-1.
(10) Repeat technique of(6), (8), and (9) above at connection
listed in Table 4-6. Digital voltmeter will indicate within limits
specified.
(11) Set AC POWER switch to OFF and disconnect cable -
W1 from test box.
g. Boost Pressure Indicator Test.
(1) Connect jumper between pin N and pin R of connector -
J3.
(2) Push in POWER DC circuit breaker.
(3) Place POWER DC switch ON. BOOST PRESS ON
green light shall come on. If not, check the following:
(a) Replace lamp.
(b) Check for +28 vdc at pin N of connector J3.
(c) If +28 vdc is absent, replace wiring between pin N
and contact 2 of BOOST switch S1.
(d) If +28 vdc is present, do continuity checks on indi-
cator light and associated wiring (FO-1). Replace indicator light
or repair/replace wiring (FO-2).
(4) Place POWER DC switch OFF.
(5) Remove jumper.
(6) Connect jumper between pin N and pin P of con-
nector J3.
XDCR Output Voltage
4 - 2 2
