HP 8112A Operating, Programming And Servicing Manual page 344

Microprocessor Board
Change 1 5
B - 1 0 Backdating
In Appendix A, Table A-5
A3 081 16-66523 U5
Pin U9 ROM2 US ROM3 U7 ROM4 U6 ROMS U5 ROM6
9 U3H3
10
274F
1 1 89CC
13 U630
14 4P70
15 l lUF
16 A3CP
17 4C7P
A ferrite bead was introduced around the base connector of Q400A,
and the value of C535 altered, to improve pulse performance when
ringing and fall times are excessive, as shown in Figure B- 1 .
For instruments with serial number 2343G01580 and lower make the
following changes to the appropriate parts-list :
modify :
Reference Description
ROM 6
U6 ROM 5
U7 ROM 4
U8 ROM 3
U9 ROM 2
Table B-2.
5U37 F90P
AOAH U397
5U76 6U6P
P4Al UlA3
9U82 75 12
H OF4 C3AU
28P7 89P4
AH62 99Cl
HP Part #
8 1 12-137 1 1
81 12- 13712
8 1 12-13713
8 1 12- 13714
81 1 2-13715
98HH 6855
6AH5 UACl
99 AU 9C5F
OP4H A375
H4F6 0064
8FC2 22A3
F55F
7HU1
1P86 668A