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REPLACEMENT OF UPPER DRUM
(2-head/4-head drum models are applica-
ble here. Hi-Fi models are equipped with
an upper-and-lower drum assembly.)
Note:
The gap between the lower drum and the upper
drum is very accurate, in the order of microns, and
care should be paid to their replacement.
Even a
slight amount of foreign material will affect the ac-
curacy of their reassembly.
@ Replacement (Follow the order of the indicated
numbers.)
@ Remove the drum earth brush and its spring ©.
@ Put a mark for the direction of the pre-load col-
lar and the drum shaft @.
@ Loosen the set screws (M4) @ of the pre-load col-
lar. Take out the pre-load collar upward.
@ Pull up the upper drum @ out of position.
Note:
1. Remove the drum motor, referring to the drum
motor replacement.
2. Put a mark, with a marking pen or the like, in or-
der to identify the direction of the pre-load col-
lar and the drum shaft.
Now remove the pre-
load collar.
3. Be careful not to lose the drum earth brush and
drum earth brush spring.
Handle the brush with care not to allow any dust
and foreign matters on it.
4. Avoid touching the drum surface with bare
hands.
5. Pull out the upper drum with care so that it may
not be tilted.
6. Do not hit the screws when tightening them.
27
Figure 4-45.
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