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3-5. Drum Assembly Replacement
3-5. Drum Assembly Replacement
Outline
Replacement
Drum assembly removal
Installation surfaces cleaning
Drum assembly installation
Video heads and tape running surfaces cleaning
Adjustment after replacement
Tape running adjustment
Video tracking adjustment
CTL head position adjustment
AT head position adjustment
Drum phase system adjustment
PB system adjustment
REC system adjustment
Precaution
Be careful not to damage the CTL head, AT head, and peripheral tape guides when
replacing the drum assembly.
Take care that the video heads of the drum assembly is not damaged during re-
placement.
Basic knowledge
For except the periodic replacement, replace the drum assembly in the following cases.
. When the damaged upper drum assembly or tape running surface cannot be
recovered
. When no proper RF waveform can be obtained during tracking adjustment
because of the worn upper drum assembly or lower drum
. When the VTR performance cannot be satisfied due to noises or jitters because of
its bearing life
Preparations
1. Put the unit into the unthreading end state.
2. Turn off the power.
3. Remove the upper frame.
(Refer to the maintenance manual Part 1, Section 1-6.)
4. Remove the cassette compartment.
(Refer to the maintenance manual Part 1, Section 1-7.)
Tools
. Torque screwdriver bit (for M2):
. Torque screwdriver (for 3 kg):
. Cleaning cloth (15 cm x 15 cm):
. Cleaning liquid:
3-24
J-6325-380-A
J-6325-400-A
3-184-527-01
9-919-573-01
BVW-55 P2
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