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TM 11-5820-890-30-5
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. RESPONSE: 8
b. DMM reading is 12.6 to 13.6 V dc. If not,
Read DMM.
go to chart 4.
c. RESPONSE: 9
c. DMM reading is 26.5 to 27.5 V dc. If not,
Read DMM.
go to chart 5.
d. RESPONSE: 10
d. DMM reading is 180 to 220 V dc. If not,
Read DMM.
go to chart 6.
e. TEST EQPT SELECTOR: SCOPE
e. Ripple is less than 100 mV p-p. If not,
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, 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
28 V: OFF
(continuity). If not, the chassis is bad.
Turn off test power supply.
TEST EQPT SELECTOR: DMM
RESPONSE:
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 ground,
Read DMM at each position.
chassis is bad.
9-6
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