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Main tenance
READ ENABLE GATE
AMPLIFIER
FILTER
DIFFERENTIATOR
R30
1000
+12V
TPl
HEAD
HEAD
~
I
ERASE COILS
READ/WRITE COILS
~
Pj?
~
~~r_~C"R4--------------------------~-----------------------+------~
. " -
T--;....~---.T
.
C R3
I
o
Ll
L3
39pH
27pH
~~
C2
R2
0.01
1620
C12
R37
R31
0.01
14.7K
3160
~~13
~
1
~
LINE
ISOLATION
DRIVERS
r-~
~
...J"V'V'VV'V'
---CD--~
5
r---+!--
Rl0
'-'__
lOOK
01
R8
16.2K
R24
511
Cl0
20 pF
6
C14
am
'---+---1r----;I(r-----:---....;,;,;R E:;,.A;.:,D...::.B __________
~)
K
~
TO XA7 A-H
L
~~
' "
~
r_~
~r-
r--.r_4-----------------------~
1:~
02
~.-~~:--.~
5r-_C.Rr2~------------------------r_----------------------+-4_----~S
D
R9
16.2K
C8
82 pF
L2
L4
39pH
27pH
~
R29
511
C13
0.01
9
Cl1
f,
U2
20 pF
1
4
R38
R41
3_
6V
14.7K
1
3160
T
~.~J~TT'·~~
_ _
-+ ____
~~
__
-+~,~~~~~A-~
10
Q14
R39
261
I
I
I
I
~
!
261
C15
I
L·~·~·
. . · · · . . . . · · · . . · · · . . · · · . . · · ·
~
. . . . . . . . . . . . . . . . . . . . . . . . . . .
~.~.~'--
R42
1000
v
0.01
I
L -_ _
----<_---;~(
____
-:--_.:..:.RE:::.A.:..:.D..:..A'---_______
~)
L>---i-- TO XA7A-F
I
\0
DETECT
-
DECREASE
WR ITE CURRENT
R35
~
8200
--"M----;---..-
r-
R
-
36
---ic-1
012
620
LLOWING PINS ARE GROUND AT PI;
,THRu 10. 12 THRU 15. RAND S.
- - - - - - - - -
T
+12V
CR15
9.09V
fr.:\
lC6
~
~
30pF
CR5
ISOLATION
R3
1000
+1
V
R5
t
20K
R4
1000
CRS
R14
2200
...........................
WRITE
ENABLE
010
··· .. ··· .... ·· .... ··· .. ·· .. ··f .. · .... · ........ ;
........
.....................
R45
2200
12V
R16
fP
1200
R15
~
09
100
+12V
......................................................................................................
MULTI HEAD
SELECT DETECTOR
I
I
I
I
I
I
I
I
MULTI HEAD DETECT
r-------~
______________
'---.:..::..::c_'_'_'_'.=....c.::....:....:::..:..=..'___~
4
>----i-
TO XA
7
A-12
CR14
I
011
I
..... ................................................
.. .
fR46
~
I
I
I
I
I
,
R50
I
L -_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
--=E""R""AS:..:E:...::D-=E""TE:..:C...:.T ____
~,
A>---+- TO XA 7 A-S
R49
10K
1200
100
(j:k
AC CURRENT DETECT
CR9
+12V
R6
20K
,\7
~
016
I
I
I
.. ·· .... ·· .... ··· .. ··· .. ··· .... ·· .. ····· .. ·· .. ··· .... ·· .. ·t .. ·· .. ·· .. · .. · ........ :
C~O
C3
:
....
10 pF
~----------r_~~~~--------------------------------1_----------------------------------------------------
______________________________________________________________________
~A~C~W~R~IT~E~D~ET~E~C~T
__
~B~TOXA7A.R
: ........................................................................... :
I
f
R26
5100
CRll
-12V
...
I
CR16
I
~
~
,
00
~r+\ __ ~~~~cr~'~~
__ --;....-,
I
~ ~R28
\V
lC7
:
5100
T
30 pF
'I
CR12
V
R18
-12V
51 K
DC WRITE DETECT
I
L--_'---_ _ _ . -____
--= ____
~--------------------~-+---------------+----~------------------------------------------------------------------~~.-------------------------------------------:....:....:~~~~~--~>C~TOXA7A-P
05
A GATE
R47
6200
B GATE
....
R23
3160
R21
3300
R19
1000
WRITE
CURRENT SINK
08
R27
16.2
Q15
L -_ _ _ _ _ _ _ _
~II__
-12V
INTERLOCK LINE
r
M
r--
m " ' "
I
I
___ J
Figure 5-26. Write Driver/Read Preamplifier PC
Assembly A6, Schematic Diagram
5-33
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