Sony BVH-2000, Operation And Maintenance Manual

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6-4. LOWER DR MASSY REPLACEMENT
Preliminary Information
A. Although the upper drum is normal and the life of the
upper drum still remains enough, the lower drum assembly
should be replaced in the following cases.
I. When a correct RF waveform can not be obtained by
tracking adjustment because of wear or damage of the
tape guide of the lower drum.
2.
When the deterioration of the video signal or the
audio signal no longer can be tolerated because of
wear of the bearings.
B. Do not insert the shim between the upper drum and the
flange of the lower drum except that the shim is included in
the lower drum assembly supplied as a repair part. (Do not
use the shim again which was used in the former drum
assembly.)
C. Replacement and the subsequent adjustment should be
performed as follows.
D. Prepare the following parts for the replacement.
Taper shaft screw: Sony part No. J-6040-460-A
Upper drum eccentricity adjustment
gauge: Sony part No.
J-6040-750-A or J-6040-750-B.
E. During replacement, turn off the power.
Removal
1. Remove the stationary head cover, the drum panel and the
reel panel.
2. When the movable guide has been closed, turn the
threading motor with a flat-blade screwdriver to open the
slant guides.
3. Remove the three screws securing the drum lid.
4. Remove the three screws securing the DR-13 board (except
for 00 model) or D R-20 board (for 00 model).
5. Remove the two screws securing the upper drum.
RP-09 BOARD
THREADING MOTOR
ENTRANCE SLANT GUIDE ASSEMBLY
EXIT SLANT GUIDE ASSEMBLY
MOVABLE GUIDE ASSY
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LOWER
DRUM
ASSEMBLY
Fig. 6-1'6.
Lower Drum Assembly Replacement
6-12
B V H -2000 (U /C) IPS/PM
BVH-2180(U/C)/PS/PM