TM 11-6625-3081-23
7 - 2 9 .
PROGRAMMABLE DIGITIZER 2A2A1
7-29
INPUT CODE:
DIGITST (cont)
Channel B is programmed to 1 V/D, POS +4, and coupling to ground. The data is
sampled, moved to a matrix, and averaged.
The averaged sampled data is checked for
A 5V p-p, 10 kHz sine wave is applied to channel A input B. The sample
240 to 255.
rate is programmed to 0.1 microseconds per sample.
The period of the sampled signal
is checked for 99.0 to 101.0 microseconds.
The signal measured by the programmable
digitizer assembly is checked for 4.75 to 5.25v p-p.
A 5v p-p, 10 kHz sine wave is
applied to channel B, input B.
The sample rate is programmed to 0.1 microseconds per
sample.
The period of the sampled signal is checked fo 99.0 to 101.0 microseconds.
The signal measured by the programmable digitizer assembly is checked for 4.75 to
5.25v p-p.
b. REPLACEMENT PROCEDURE REFERENCE
The following list provides a cross reference of replacement items to
replacement procedures.
The item column identifies the item to be replaced by
reference designation and part number.
The reference column identifies the
procedural paragraph used to perform the replacement action. The VDT screen will
display the proper sequence of repair/replace actions.
Item
(Ref Des/Part No.)
Reference
(Para No.)
2A2A1/7612D
2-43
2A2A1XX (Channel A) 7A16P
2-43
2A2A1XX (Channel B) 7A16P
2-43
c .
SEGMENT 1
1. VDT DISPLAY
PERFORM THE FOLLOWING REPLACE ACTIONS IN THE ORDER LISTED. (REFERENCE
TM 11-6625-3081-23 FOR REPLACEMENT PROCEDURES.)
REF. DES.
PART NO.
NAME
1. 2A2A1
7612D
DIGITIZER
2. CORRECTIVE ACTION - SEGMENT 1
(a) Remove Digitizer 2A2A1.
Check contacts of mating connectors and repair
if required.
Install replacement 2A2A1 and perform DIGITST test. If
DIGITST test passes, no further action required.
If DIGITST test
fails, proceed to (b).
If another segment displayed, proceed to that
segment and continue troubleshooting.
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