HP 7970B Operating And Service Manual page 11

7970B/7970C
Theory of Operation
I
I
I
I
I
I
I
I
+SV
KIA (ENERGIZED)
~~~~-4~~~~~~~~~~~AI
-20/40V
R27
R26
+20V
------------iM-----... ---+-..
+20/40V
-20V
-----------t4----i>---+---,--II ..
-20/40V
HSFWD
MOTOR VOLTAGE
DELAY TO
">cHI-_
CONTROL AND
STATUSPCA
FEEDBACK CONTROL
R47
VOLTAGE
FEEDBACK
).
SUPPLY
REEL
MOTOR
L __ _
-SV
7970-512
Part 2
RIOS
VOLTAGE
FEEDBACK
TAKEUP
REEL
MOTOR
>-.... - __
-<11-____ - - - - - - - - - - -... I KIC (ENERGIZED)
.J..
-20/40V
RB
R7
Figure 2-5. Reel Servo, Block Diagram
2·9