Table of Contents
Advertisement
7970Bj7970C
•
_2040V
Rn
G
HI01
TP
R5S
!' I II
CR4
R30
'20
C19
031
f132
G
I
C12
I
A29
•
CHI
A34
A71
C14
C13
•
~~.~
8
C16
Rn
R33
A23
G
en
R]S
A47
•
~
R38
<
0
fo4
CR7
R4~
Fl49
R"
R25
Cl
~
.~
R24
8
R62
(
'\
R62
,.)
R35
8
§
Ir-
RlR
R26
8
R56
~
H57
8
0
R48
0
A60
l<1li
en2
U
u
8
W
R59
1411
CRll
\
\
8
A46
I
RSS
R 109
I
J
I
Qll
"
A7
(
'\
L
J
"
u
09
Rl00
!-<II
CR 1
RS3
0
040
04
C3
R6
R39
co~~
~
R5
.~
U
u
R50
J
R3
R61
~
CRB
~
.~
R5l
~
1
(0
"
R44
8
C2
C~·~
RlO5
R 19
.~
A15
C3
Rl
<
R2
c
(.]
.~
I
Cl
I"
R17
R 14
Cf-U
110(
-
- -
G
C7
Rn
[Ibm
g?19;fl~1173
.~
CR
A12
H 10
Rll
8
·2040V
lP
R64
•
118
A3.A4
7970-402A
Figure 7-7. Reel Servo Assemblies A3/A4 and A7, Parts Location Diagram
Part 2
,-
1
SUPPLY TENSION ARM PCB
ASSEt.lBLY A3
079HJ-60481
1
I n
WHT/BLK/ORN
al
I
1
I
I
L
~
'\
I I
BLK
'-
/
I '
I
D51
t t
I
1
I
I
In
I
I
1
I
I
RI
I
I
BLU
I
I
I
I • •
I
I
I
I
I
: WHT/BLK/RED
L
_ _ _ _ _ _ _
---1U
FROM
POWER DISTRIBUTION PCB
ASSEMBLY .A20
+20/40V
SUPPLY SERVO COMMON
-Z0/40V
TAKE-UP S(RVQ COMMON
FEEDBACK CONTROL
MOTOR VOLTAGE
+20V
+
12V
COMMON
-1211
T.AKE-UP TENSION ARM PCB
ASSE~BLY
A4
liH97"-604S I
1
1
1
1
1 (
1
I
(
+
12V
-S.2V
R23
C ~ ~
.
100
(SUPPLy)
TPI
Q----<
~I
CI5
I~UT
::~I(
.01
r;"PF
R41
464K
>-rJ~4_~
1 __
~--R~2N·V-
__
~-vR~2r'~~~
__
--~2Ci~
711
ra
U~U
26.IK
( - ; U :
6
1
4
n
1
1
<;-t------- -
I 2
V
1
f-L--
+5.211
121.22
+20/40V
R55
I.K
Rll
~
C13
10"
~
.01
-12V
I K
+20/40V
----r-----~--------------_,
:::T :~'
R27
T~~:2
as
R2~
alT
R.5
I. "K
H~2
2.2K
I/?.W
a6
82.
R3.
75.
-1211
R3I
I • •
CI9
f.""22
r;;
as
R29
I K
R3'
I ••
R36
I • •
(SUPPLY)
.A~PL
R33
10K
R45
R47
10K
13.3K
R I 06
2K
R48
1.78K
al5
era
G
~-
014
R49
R42
100K
121.25
R51
I I 2 I I 2 I K
'\7
KIA
4
+20/40V
(i)
'~PIO
•
CR6
-!...
7
J
6
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
R5
R6
,-____________
~-----+--_}------~~------~------------------+---~--~D
L·C; __
4-__
~--~-----~,--------~J5~
I
I
+
12V
R4
~~
10"
::
3BPf
7
C4
30PF
348K
348K
RI04
RI6
[
2K
R53
I. r8K
RI05
R40'
21 .25
I
I
I
I
I
:
+20/40V
I
~
".K~;
+2.14.V
R~
"75'.31IK
Q3
R44
QI6
01
Q~
IJ.3K
:
CD
r
--------------------L ( \ WHT/BlK/CRN
-1
i
~.,
w
C5
) 2 .... n'-J
3'--~~r_--.,.,...--_.._--.,.,...--<>-----+---=.2 ~
-
I B
R I 5
1
I
I
1
r ' , ' , -_ _ _ _ _ _
-' B "L"K' - +-' »
4
1
I
N~UT ~~u
2
~; ~:
~
; . U I
>--=6'--__
~~
[--'''',
KV-+---~
n
".22
R56
'V
R3
h
C2
pA
R 7
~
T
~ ~0
2: 2
'-------~R--,
4---+-1
~,
" " ' )
I . \
7
:
I C
C:-<J...;9,--.......
~
__
~_;_~,
~
R B I "9
+--.... __ -.-______
~--------------------~6
o---J
I
~
p /
0
9121.9
I
CR6
82121
RI2
RI9
I
1"1<
,----_
----....------------<~o-~
I
(i)
1
1
1
1
1
1
L
RI
________________
V0~----,-_,_,_------~B~L~U~(
I
I • •
-+:~W~H~T-'I~B~L~K~I~R~E~D~(
3
__ --' u
1
1
<;-t-------
1
f-L--
-12V
-5.2V
R46
3.16K
121
1013
~
0.01
a2
RS7
-12V
~~~'-.-4-7-K--=~R5~9~========~------------~
R 5 f C l a l 9
3.16K
~2"
I.:~-
~
R I I
75.
I ••
:::;:: ca
____
04
1.
0022
(V
RI.
I K
RI7
I • •
A~PL
.~ "',.-0"
- 20/4 011
-------<~--
____
~
________
--I
~__I-----------~_O_--J.:
K
1~2:"/4"V
---o-~ ---I~
A
+21311
R!09
I K
CRI
. .
r;;
QIJ
L--1rM--~--T_1~
~
FROM CAPSTAN
SERVO
pca
ASSE~BlY
A9
CAPSTAN MOTOR LOAD
------+1-'»
2:
/)-r--------------t------------------------------------------------------------------------------------------------------------~
{
TEN510N LATCH
---~Ir«
3 /
J2
CRI I
R60
5. I I K
CAP5T," RETURN
1 )
I
>1--------------r-----------------------------------------------------------------------------------------------------------
TEN510N
I ( 4
/~I
__ - -__
--------~--------------------------------------------------------------------------------------
__________________________
~~--~
NOTE:
I. CRS IS AN ENCAPSULATED BRIDGE CIRCUIT.
CRl
2.
UNLESS OTHERWISE SPECIFIED,
All.
RESISTANCES ARE IN OHMS,ALL CAPACITANCE ARE IN MICROFARADS.
3.W
COMMON (SUPPL Y SERVO RETUfO,)
4.W
COMMON (TAKE-UP SERVO RETUHNI
Maintenance Diagrams
1
1
1
1
"
RED
MOT
U
Bll<
"
BU<
I!
MOT
1
1
1
1
\J RED
81
SUPPLY
REEL
MOTOR
B2
TAKE-UP
REEL
MOTOR
Figure 7 -8. Reel Servo Assemblies A3/ A4 and A 7,
Schematic Diagram
7-9/7-10
Advertisement
Table of Contents
