HP 740B Operating And Service Manual page 103

Model 740B
Section VII
NOTES: FIGURE 7-13
1. A13 COMPONENTS ARE FACTORY SELECTED AND ARE NOT SEPARATELY
REPLACEABLE.
rrv
= = = = = = = = = = = = = = = = = = = = = = = = = = = = O V E N HEATER AND
REGULATOR============================~~
-0.5V AT TURN ON
-0.02V AFTER 20 MIN. WARMUP
FROM A6-14
-30V
fOAI3]
-1
12
I
HRI
65
I
L__
_II
~
OVEN
rr
V
====HEATER=I=======:::;]~
HEATER
rrV
=====CONTROL
=====~~
- 23V AT TURN ON
18
>--_-..:;13;.;.V..:;A.:...FT:..:E.:...R..:;2.:..0.:...MI.:...N• . :...W..;.A..:.:RM..:.:U.:...P
-+-t
I
I
I
---~
FROM A6-21 FROM A6-14
+IOV -30V
A A
---i------t
l
+I&V - 30V -30V
I
R38 R41
10K 2700
+IOV
1' ' ' A 2
r --
I
I
I
(16~----~
I
rrv
= = = = = = = ERROR AMPLIFIER=======:=:::;]~
I
I
I
-4V AT TURN ON
+IV AFTER 20 MIN.
t---->O":------7
4 ) WARMUP
I
>- (NOT
HI----~--_7 9
CONNECTED)
I
FROM A6-21
+IOV
~----I
R2
15K
RI
12.8K
I
I
L
2
J
y
-IOV
FROM A6-18
I
p/
oAl3
f --
I
I
OVEN
TEMPERATURE
IrV
======SENSING
BRIDGE=======\1~
(NOT
-<
CONNECTED)
~
v
a:
I I
~ ~
a: a:
I I
~)
~)
2. VOLTAGES INDICATED IN RED IN OVEN HEATER AND REGULATOR CIR-
CUIT ARE REFERENCED TO W.
3. VOLTAGES INDICATED IN RED IN 1 V REFERENCE SUPPLY
cmcurr
ARE
REFERENCED TO WAND
W
IN STD MODE; WONLYIN OTHER MODES.
4. FIGURE 7-3 (Top and Bottom View) SHOWS THE GROUND POINT LOCATIONS.
-RI3- - R I 9 - 1
I
-R26- -1132-
I I
~ 0~~~ ~ ~~im
RI - R I 6 -
I I
-R29-
I
I
0
[;] cit] ~
[jb:
-=Rl2-
T
43
I-
~)
II
~)
l
IrV
= = = = = = SERIES REGULATOR =======\l~
I
I
740B-B-0743A
AI
hp
PART NO. 00740-66521
22 r r = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = I V REFERENCE SUPPLY =================================\I~
CONTROL DIFFERENTIAL
IrV
=========AMPLIFIER
============\I~
7-27/7-28
REF
FINE ADJ
~
TO S3A-16 +1.00000V
t--------
REFERENCE
SUPPLY OUTPUT
22
+5.9V
TPI
REFERENCE
IrV=========ADJUSTMENTS========~~
I
I
I
r~
Figure 7-13. Oven Heater and 1 V Reference
Supply (p/o A1, p/o A2, A13)
Schematic and Component Location
Diagram
CRI
6.3V
RII
680
01794-1
RIO
3300
RB
4750
R9
5110
I
I
___J
COPYRIGHT 1966 BY HEWLETT-PIIICKARO COMPANY
I
I
r-<i
R43
680
-+~v::I
I
p/
OA13
r--
TP7
I
TO S3E(R-9)
I
I +12V I
r--+------4~-~20)>-
...
1-----«
6
f - - _ - - - - - - - - - - . . . - - - ,
I
I
19) > - - - - - - - « 5
f--+----,
I I
6.8V
CR5 r
740B-D-0739A
I
P/
OA2
f--
I
I
~~6
+
34 V
~22 ~-"""'--JI,'VIr--iI-
......
-~
FROM A6-3
I
I
I
22
-R30-
cEQ
-R29-
-C9-
P
-CR4-
-CfO- -R28-
-R20-
~@O
-R26-
B
-CR3-
-R21-
E
-R25-
-R22-
8~
-CI2-~
-R23-
-R32- -R24-
-R33-
E~B
-RI8-
-R31-
~
-RI9-
E©B
- C I l - C - C 8 -
-R27- -CR2-
-RI7-E@B
c
A2
hp
PART NO. 00740-66522
-RI2-
~EJ -RI6-@TP8
-RII-
-C7-
-C5-
@
-RI5-
-RI3-
ECB
-RI4-
-C6- ~
-RIO-
ECB
-CI5-
E~-R9-
-R3-
c~
-R8-
-R4- B -CI5-
-C2-
c~-C3-
-R2-
~
-R6-
-RI- E@-R5-
c
01
-CI-B
-R7-
-CRI-
74OB-0744A