HP 3562A Service Manual page 201

OD E L 3562A
4. Change the A4 schematic in section IX as shown in figure 5-A4a.
(5)
U22
(6)
(7)
A
12
U 2 1
14
1 5
16
7
19
Figure 5-A4a Local Oscillator Schematic Revision A
U25
5
3
FL l P -
FLOP
8
A O U20
A I
6
A2
5
9
A3
D O
4
10
A4
D I
D2
A6
D 3
I
14
A7
D4
15
D5
A8
16
A9 D6
1 9
17
D7
AIO
1 8
A l l
A I 2
20
c s
8
AO
U29
A I
6
A2
5 9
A3
DO
4
10
D I
I I
A5 D2
2
1 3
A6 D3
I
14
A7
D4
15
A8
D5
16
A9 D6
1 9
D 7 17
A I O
A l l
21
AI2
cs
NOTE:
E20 AND E 2 9 ARE FOUR-P I N EXTENSIONS ADJACENT TO
U20 AND U29 TO ALLOW USE OF 2a- P I N EPROMS OR R O M S .
LOAD 0-0HM R ES I STORS F O R R 2 1 A N D R 2 3 T O U S E 24- P I N
DEVICES , O R FOR R20 AND R22 T O U S E 2a-P I N DEVICES.
FOR UNLATCHED ADDRESSES (EPROM) LOAD R25. FOR
LATCHED ADDRESS, LOAD R26.
R20
R21
E20
I K
I K
15
E29
I K
zz
U40(9,12)
BB
R22
IK
R34
U50(3)
+ 5V
MANUAL BACKDATING
(7 )
U I 8 (8)
(9)
R24
I K
+5V
3
I
4
F
U I 2 ( i 0 )
C
U45(3)
4
A
U35
B
6
C
D
J
K
10 MODE
I K
I
CLR
4
A
5
U30
B
6
C
7
D
J
K
MODE
10
CLR
4
A
5
U38
6 B
C
D
J
K
MODE
I
CLR
A
U34
B
C
7
D
J
K
MODE
1 0
CLR
5-3