HP 4262A - Page 251

Bet AR5 to CMP o START /S A23PAG
Set 0000 into all ront
pasal
switches.
Go to Figure B-19,
Flow Diagram B.
Chack A24U% and
e
0
2
“s
o X!
o
Figure 8-52. A24 Comparator Control Board Diagnostic Flow Diagram.
Check AARS thry
RLI znd ASDSL
thru D8,
Check ARMKI thry
KB and CRI thry
CRS
START ./~ A23PAB
STOP
™\ AI3PAS
CLOCK /= A22TP2
Press COMPARATOR
ENABLE push button.
Window Test \YES
15V URFP?
wo
Chack AZ4UL, US
and A board, K
OK, Go to Flgure
8-19 Row Disgram
a.
Troubleshoot YES
Stuck Node.
Is Signature Set T2\ YES
K?,
{see Table A) O
Check A24Us.
A24 Board Diagnostic Flow Diagram
‘ Under Fold
Go to Figure 816, Flow Diagram 5.
Comparator
YES(( koy board Dats }ooa! Check AS board,
Bus Stuck ?
NO
Check A24u7.
Thumbwheel Swiich
A 4 5 Comparator Keyboard
3 SERVICE SHEET 4, 6
SEE IRSIDE
8-65