HP 8559A Operation And Service Manual page 233

Figure 8-33. Marker Assembly A8, Schematic Diagram
Below Change
Replace f u n c t i o n block ( I ) o f F i g u r e 8-33 w i t h new P/O F i g u r e
Below Make t h e f o l l o w i n g changes t o new F i g u r e 8-33 (1 o f 2 ) (SERIAL
Below I n t h e edge connector t a b l e f o r P I , change FUNCTION B L O C K e n t r y
Figure 8-33. Marker Assembly AS, Schematic Diagram (2 of 2)
Below Change
Replace r i g h t h a l f o f f u n c t i o n block
Below I n f u n c t i o n b l o c k
Make t h e f o l l o w i n g changes i n f u n c t i o n b l o c k ( E l :
258,262,265,277;
Below
A 8
t o H P P a r t Number 08559-60022.
33 (1 of 2 ) (SERIAL PREFIX 2309A) included i n t h i s Manual
Backdating supplement.
:
PREFIX 23OgA)
Change R33 t o 34.8K.
R88
Change R87 and t o 34.8K.
D e l e t e t h e +14.5V supply a t R108.
Delete R108, R109, and CR21.
Connect p i n 14 t o p i n 1 o f U2A.
f o r p i n 10, -10V, t o NC.
A 8
t o H P P a r t Number 08559-60022.
8-33
P/O F i g u r e
Manual Backdating supplement.
and a t p i n 4 o f U15.
Change R34 t o 10K.
Change R62 t o IOK.
Change R94* t o 61.9K.
of 2)
o f F i g u r e 8-33 w i t h new
change -lOV t o -12.6V a t t h e wiper o f R61