HP 5300A - Page 41

it. Model 5300A
Maintenance
Table
5-2.
Character
Generator
Input
Codes
5-25.
Insert
Test
2.
Tests
the
remaining
numerical
digits.
Display
should
read
987610
only.
If
display is
CHARACTER
Al1U2
INPUTS
107610,
check
DATA
D
line
for
a
low
level.
Replace
(NUMBER
DISPLAYED)|
A
B
CC
OD
RAL
U2
to
repair.
If
display
has
a
bad
character
replace
U2.
_ ~]
roy
ry
es on
-_ fr)
_
i<)
5-26. Insert Test 3. Tests the remaining character
codes. Display should read X 9 XQ - 8 (blank, 9, blank,
9, -, 8). Refer to Table 5-4. For any bad characters,
replace U2.
0
1 LEFT
1 RIGHT
2 LEFT
2 RIGHT
3 LEFT
3 RIGHT
4 LEFT
4 RIGHT
5 LEFT
5 RIGHT
5-27. Insert Test 4. Tests U2, U3, F1 input to U5, and
A1A1DS7 to display 6 digits simultaneously and to
cycle them (6 at a time) from 0 to 9. Refer to Figure
5-3C, Test 4. “C” lamp is on all the time.
5-28. Diagnostic Test Card “B”
5-29. Insert Test 5. Checks U3, U4, U5. Display
should be @ 888888 ( @ = overflow). “C” lamp and
overflow should cycle.
5-30. To use Diagnostic Test Card “B,” connect this
card through the interface card, HP Part No. 05300-
60004, to 5300A mainframe AlJ1 connector. Prior to
each test, press RESET and refer to Figure 5-4A.
mamreormmorrertar rrrrm ee eee ee
maeoemrrrr|per Gr ee TES es es EE cto ot
neemrmteree ere ee
Figure 5-3B. Display Checks (Continued)
INSERT
2 TEST
2
DISPLAY IS
i 987610
DISPLAY IS eres 3 DISPLAY IS DISPLAY IS
107610 CHARACTER 886600 981010
INSERT CHECK U2 CHECK U2(17) CHECK U2(14),
TEST (16) SHOULD FOR POSSIBLE (15) FOR POSSIBLE
3 BE (HIGH) SHORT. SHOULD SHORT. SHOULD
BE HIGH BE HIGH
CHECK PC
DISPLAY
IS
BOARD
ANO
asm°-38
CONNECTORS
- FOR POSSIBLE
SHORT
oK
INSERT
TEST BAO
CHARACTER