Upper Drum Assembly - JVC HR-S3800U Service Manual

2.2.25 Upper Drum Assembly

1. How to remove
(1) Remove the stator assembly and rotor assembly.
(2) Loosen the screw of the collar assembly using a 1.5 mm
hexagonal wrench and remove the collar assembly. Also
remove the brush, spring and cap at one time.
(3) Remove the upper drum assembly and remove the
washer using tweezers.
Note: When replacement is required, control the up-
down movement of the brush. Never apply
grease.
Collar
assembly
Spring
Loosen
Brush
Cap
Upper drum
assembly
Washer
Fig. 2-2-44
2. How to install
(1) Clean the coil parts of the lower drum assembly and the
newly installed upper drum assembly with an air brush
in advance. (See Fig.2-2-45.)
(2) Install a new washer and upper drum assembly on the
drum shaft. (See Fig.2-2-44.)
Note: When replacing the upper drum assembly, re-
place it the together with the washer.
Coil parts
Fig. 2-2-45
2-19
1.5 mm
hexagonal wrench
Shaft
Lower drum assembly
Lower drum assembly
Upper drum assembly
(3) Install the cap to the upper drum assembly.
(4) Position the collar assembly as indicated in Fig.2-2-46
while controlling its up- down movement.
Upper drum
assembly
Fig. 2-2-46
(5) Secure the collar assembly in position with a hexagonal
wrench while pressing its top with the fingers.
Press
Collar
assembly
Fig. 2-2-47
(6) After installation, gently turn the upper drum assembly
with your hand to make sure that it turns normally. Then
install the brush and the spring.
(7) Install the rotor assembly and stator assembly accord-
ing to Fig 2-2-41 and 2-2-42.
(8) When installation is complete, clean the upper drum as-
sembly and lower drum assembly and carry out the fol-
lowing adjustments.
• PB switching point adjustment
• Slow tracking adjustment
• Compatibility adjustment (Be sure to check for com-
patibility for the EP (or LP) mode.)
Collar
assembly
Tighten