ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-11. CDU Testing and Troubleshooting -- Continued
Malfunction
indication/corrective action
Normal indication
Test procedure
EXECUTE switch-indicator lights
2b. Press EXECUTE switch-indica-
tor to on
TTY prints out: (For core memory
only)
ALIGN-
PADS DIAGNOSTIC
MENT PROCRAM
PROGRAM CHECKSUM XXXXXX
SELECT TEST MODE
2b-1. For solid state memory press TTY prints out:
CDU keys SPH 800 ENT'
PADS SOLID STATE DIAGNOS-
TIC ALIGNMENT PROCRAM
PROCRAM CHECKSUM Xxxxxx
SELECT TEST MODE
Checksum is incorrect
2c. Compare printed checksum to Checksums are equal
checksum written on either the
See step 3j of table 4-6 or step 3k of
front of the diagnostic-alignment
tape or solid state program tape
From this step to completion of test,
TTY prints out:
2d. Type TTY character set CDU
a TTY CDU failure message listed
(selects CDU automatic test
CDU
model)
in table 4-13 may occur, Perform
corrective action specified in table
CDU AUTOMATIC TEST
No CDU display
MODE
Replace cards in sequence given:
CDU numeric displays 0 thru 9 at
2-second intervals. Alha module
Keyboard and control circuit card
, +, and x
displays alternately
assembly A3
Display logic circuit card assembly
Al
Display logic circuit card assembly
A2
Before proceeding, check that TTY
has printed XXX CYCLES PASS.
CDU numeric module displays all No change in display function:
2e. Press CDU LAMP button and
8's
release within 2 seconds, Repeat
Check wire harness continuity from
if necessary to observe indicators
P1
Alpha module displays . All dis-
play indicators are lighted
Replace front panel assembly
All lamps do not light
Replace defective lamps
Change 5
4-74
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