HP 740B Operating And Service Manual page 102

•
Model 740B Section VII
+180V
PD£:~':'~,
--I
I irll
= = = = = = = = = = = = = = = = = = = = M A I N LOOP NEON DRIVER===================~~
I
NOTES: FIGURE 7-12
P/oAI7
MAIN L o o ; - l
CHOPPER
I
10
I
I
II
v<?
I
II
• DS2
I
\\
I
13
'-I
llo
I
I
__J
12
I
R33
365K
COPYRIGHT 1966 BY HEWLETT-PACKARD COMPANY
1. VOLTAGES AND WAVESHAPES ARE REFERENCED TO WAND
W'
2. FIGURE 7-3 (Top and Bottom View) SHOWS THE GROUND POINT LOCATIONS.
R31
1M
---~
TP20
~ -~
METER
P/oAI6 LOOP
CHOPPER
I I
I
R32
100
R30
1M
CRI2 r
24.3V
R28
36.5K
R27
39K
R29
10K
R26
82K
RI4
91K
C6
0.1
RI5
91K
L-~IV\r----+----~6>---jro---,
I
I
CRIO
CIO
0.022
R22
6800
RI9
33K
R6 R7
15K 15K
RI3
22K
R25
1M
RI8
560K
R20
250K
=METER LOOP NEON DRIVER
C3
10
RI7
560K
MAIN LOOP
CHOPPER FREQ
vu
RI2
22K
R24
1M
R5
15K
RI6
33K
R4
15K
R2
20K
L - - - - - - - - - - - - - - - - - - - - - - - - - - - j - - - - - - - - - - - - ' ) 7 > - - - - l K > - - - - - '
R21
6800
CRII ..
11.8V
C9
0.022
TPI7
+360V
:tIOV
CR7
R23
82K
CRI
5
PIO
TI
---==== +180V, +360V
===~
v-
POWER SUPPLY
I
I
+360V~
I
~-------.
I
3
r
I
~
I
R8* R9*
I 140V RI
75K 75K
I Rr
270K
C4 C5
CR3 0.1 0.1
6
2
I
*
I
+ C2
I
35
TPI9
+180V
±5V
METER
Irll
==:::;;;:== LOOP CHOPPER====~~
,","=====.POWER SUPPLY
v-
RIPPLE
========~
MAIN
rrll
======= LOOP CHOPPER
=====\l~
t
f
*_1
1
_6r
" " ' 1 . .
t----10.5M SEC
~
TP20<t>
- C 8 -
-RI8- -R24-
-CR8-
(]B
-RI6- 03
i
- C 7 -
-RI7- -R25-
-CR9-
04CD~
-RI9- E
-CRII'-
- - C I O - -
-CRIO- -R22-
-R 2 6-
r:::::\
E
-R21-
~:
- - C 9 - -
-CR7-
Q~
-R23-
V
c
22
TP2IGl~
~
-CR6-
-R7-
- C 5 -
B:8 B:@
- C 4 -
-CRI2-
-R32-
-R29-
- R 2 7 -
-R28-
-R33-
-R30-
-R31-
I I
--'
C2 CI
I I
GlTPI9 GlTPIt---::--,
- - R 2 - - -
~
-R6-
-R9-
-RIO-
-CR4-
-RI2-
-RI3-
-CR5-
-RII-
-R8-
-R5-
-R4-
[])- -CR3-
- C 6 -
-RI5-
-RI4-
1
C3
-CR2-
-CRI-
- R I -
740B-B-07!50A
A8
hp
PART NO. 00740-66528
____ ---.J
740B-O-073BA
01794-1
Figure 7-12. Chopper Neon Drivers (A8) Sche-
matic and Component Location Diagram
7 -25/7 -26