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1 . 2
MA I N ASSEMBLY R EPLACEMENT
No.
Item
U pper d rum
assembly
- Removal -
· · :·:· . ··:
Fig. 1 -2-1
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- I nsta l lation -
CH-2
A U D I O
. . - - . . . . - . - 1 - -
- Checks and adjustments -
1 -4
Adjustment parts
Operating mode
Lower drum assembly
- -
- -
- -
1
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-
-
U pper drum assembly
-
-
-
-
- - -
-
-
-
-
-
CH - 2
CH-1
EP
SP
/ CH - 1
AU DIO
CH - 2
CH - 1
F/E
-
- -
S P
. . . . . .
.
- . . .
. . - - . .
EP
.
- .
When insta l l ing the new upper drum, use care not to touch
Note:
the video heads. I f heads are soi l ed, clean with a soft, finely
woven cotton cloth or chamois that has been moistened in
a lcohol . Hold l ightly against the heads and turn the d ru m
clockwise. By n o means clean with a vertical stroke.
1 )
Refer to Fig.
1 -2- 1 .
assembly.
Use
desolderi ng tool or desoldering braid to unsolder the u p
2 )
a
per drum boards.
Take out two screws
3)
together with the upper drum board. ( I f this drum is to be re
i nstal led, use care not to touch or damage the heads.)
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-
- -
- -
-
- -
-
-
- -
-
-
-
-
-
-
-
- -
Refer to F ig.
1 )
1 -2- 1 .
drum with the wh ite marking of the lower dru m .
Reinsert screws
2)
Reinsta l l and solder the upper drum boards.
3)
4)
Clean the drum assembl ies (see above note) .
Reinsta l l the brush assembly and secure with screw
5)
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-
- - - -
. . . .
. .
- - . - -
- .
.
.
.
After insta l l i ng the upper drum, perform the fol lowing checks
and adjustments (refer to appropriate Sections of this Manual ) .
1 )
F M waveform
Servo circuit
2)
Video circuit
3 )
4)
FM audio circuit
Description
(
Take out screw
1 )
and remove the brush
and raise the upper drum to remove it
( 2 )
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- -
-
-
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-
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-
-
-
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- -
Align the b l ack relay pin of the new upper
and tighten them i n a balanced manner.
(2)
-�
. - . - . . . . . .
. .
.
. .
-
. .
.
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-
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-
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-
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-
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-
( 1
) .
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- .
-
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