TM 11-5820-890-30-4
9-8. OPERATIONAL CHECK. Continued
Step 2. POWER SUPPLY OUTPUT CHECK.
Action
Response
a. Read DMM.
a. DMM reading is 6.55 to 6.95 V dc. If not,
go to chart 3.
b. Set RESPONSE: 8.
b. DMM reading is 12.6 to 13.6 V dc. If not,
Read DMM.
go to chart 4.
c. Set RESPONSE: 9.
c. DMM reading is 26.5 to 27.5 V dc. If not,
Read DMM.
go to chart 5.
d. Set RESPONSE: 10.
d. DMM reading is 180 to 220 V dc. If not,
Read DMM.
go to chart 6.
e. Set TEST EQPT SELECTOR: SCOPE.
e. Ripple is less than 100 mV p-p. If not, the
Read scope CH A.
power supply is bad.
f. Set RESPONSE to positions 9, 8, and 7.
f. Ripple is less than 100 mV p-p at each
Read scope CH A at each position.
position. If not, the power supply is bad.
Step 3. INTERCONNECTION CHECK.
Action
Response
a.
Remove jumper cable from TP4 and TP5.
a. DMM reading is less than 1 ohm
Set 28 V: OFF.
(continuity). If not, the chassis is bad.
Turn off test power supply.
Set TEST EQPT SELECTOR: DMM.
RESPONSE: 1
RESP SEL: S2
b. Set RESPONSE to positions 2 through 7.
b. DMM reading is less than 1 ohm
Read DMM at each position.
(continuity) at each position. If not,
the chassis is bad.
RESPONSE position J3/J4 pin
2
J
3
K
4
M
5
N
6
P
7
R
c.
Disconnect cable at mounting base
c.
DMM reading is infinite ohms (open
connector J3.
circuit) at each position. If any indicate
Set RESPONSE to positions 7 through 1.
continuity, J4-pin (a) is shorted to
Read DMM at each position.
ground, the chassis is bad.
9-6
