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TM 55-4920-412-13&P
(9)
Digital multimeter will indicate between
+275 and +28.5 vdc. If not, see Troubleshooting Table
4-20.
(10)
Set ON-OFF-SIM ONLY to OFF.
(11)
Disconnect digital multimeter lead from J3
pin 34 and connect to J3 pin 1.
(12)
Set LOGIC P/S switch to position 2.
(13)
Set ON-OFF-SIM ONLY to ON.
(14)
Digital multimeter will indicate between
13.0 to 17.0 vdc. If not, see Troubleshooting Table 4-20.
(15)
Repeat Technique (10) thru (13) above
using connection J3 pin 3. Digital multimeter will
indicate between -13.0 to -17.0 vdc. If not, see
Troubleshooting Table 4-20.
NOTE
Remove power when connecting and
disconnecting test leads. Use Figure
4-1 with unit tester connected
Table 4-20. Troubleshooting Lamp Power Supply Board (A2) (AVIM)
Trouble
Probable Cause
Remedy
5 vdc output low or missing
Interconnect cable voltage missing.
Replace defect components.
Logic power Supply (A2).
Replace boards, if required. See figs
Lamp Power Supply (A3).
4-13, 4-15, 4-16, FO-6, FO-7, FO-9
Oscillator Board (A6).
and FO-10.
28 vdc output low or missing
Interconnect cable. Lamp test
Replace defective components or A2
Board. Lamp Power Supply (A2).
board as required. See figs. 4-15,
FO-6 and FO-9.
+15.5 V input low or missing
Logic Power Supply (A3).
Replace defective components or
(A3) board. See figs. 4-13 and FO-7.
-15.5 V input low or missing
Logic Power Supply (A3).
Replace defective components or
(A3) board. See figs. 4-13 and FO-7.
Lamp Supply Control Voltage
OSC Board (A6).
Replace defective components or
(Input) low or missing pin Z or E3
replace (A6) board. See figs. 4-16 and
Term (on Lamp Power Supply)
FO-10.
28 vdc (Input) low or missing
Interconnect cable voltage missing.
Check simulator section -
Interconnect circuit.
Change 2 4-41
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