Sony DSR-2000A, Service Manual

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7-1
DSR-2000A/2000AP
Section 7
Replacement of Mechanical Parts
7-1. General Information on Parts Replacement and Adjustment
7-1-1. Preparation Before Starting Parts Replacement
.
Remove the ornamental parts as needed.
.
When replacing parts or performing mechanical adjustment, remove the cassette compartment from the
DSR-2000A/2000AP not so far as specified. (Refer to section 3-4.)
. When the connector of the cassette compartment is removed, the protection circuit starts functioning.
Refer to section “4-3-3. Operating the VTR without a Cassette Tape.” to operate the DSR-2000A/
2000AP without the cassette compartment.
7-1-2. Drum Assembly
. The drum assembly is a periodic replacement part. The drum should be replaced in accordance with the
periodic replacement list.
.
The drum assembly must be replaced in the following cases :
(1) When the video heads are worn out so that the proper tape-to-head contact is lost and recording and
playback cannot be performed correctly;
(2) When the rabbet guide of the lower drum is worn out so that the correct RF envelope cannot be
obtained even after adjusting the tape path to optimize the tracking.
(3) When the rabbet guide or tape running surface of the lower drum is damaged;
(4) If the drum rotation is abnormal and the VTR does not work properly due to noise or jitter.
7-1-3. Grease
Be sure to use only the authorized grease.
If grease other than the authorized one is used, major malfunctions may result due to differences in grease
viscosity and its ingredients.
If grease containing dirt is used, the shafts and bearings may be damaged and major malfunctions may
result.
Use the following grease for the DSR-2000A/2000AP :
Grease (SG941 (20 g)) : 7-662-001-39
.
Do not apply grease to any parts other than the specified parts.
. Apply just enough grease to cover a coating on the surface.
Wipe off any grease that oozes out into the surrounding parts with gauze or a soft cloth.