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Model
JMECHA
Pages
41
Size
1.29 MB
Type
PDF
Document
Service Manual
Brand
Device
VCR / DV MECHANICAL ADJUSTMENT MANUAL VI
File
jmecha.pdf
Date

Sony JMECHA Service Manual ▷ View online

— 25 —
3-17.Guide Rail
1.
Removal procedure
1)
Remove the screw (M1.4 
×
 2) 1.
2)
When removing the guide rail, be careful that claws of the drum
base block assy are fully released.  Remove the S-side rail, T-
side rail and rail of DC motor side in this order.
2.
Attachment procedure
1)
Engage the claws of the guide rails with the claws of the drum
base block assy starting engaging the claw from the T-side rail
and S-side rail.
Note:
There must no deformation of guide rail, claws must not be
broken, claws must not override, claws must not become white,
not be stained or have no play.
2)
Fix the guide rail with the screw (M1.4 
×
 2) 1.
Tightening torque: 0.059 ± 0.01 N•m (0.6 kg•cm)
Fig. 3-17
1
 Screw (M1.4 
×
 2)
Drum base block assy
Drum base block assy
Guide rail
Guide rail
Rail of DC motor 
side (capstan)
T-side rail
S-side rail
Remove it in the direction 
of the arrow while being 
careful not to break claw.
— 26 —
3-18.Gear Cover B, GL Driving Gear
1.
Removal procedure
1)
Remove the screw (M1.4 
×
 2) 1.
2)
Remove the gear cover B in the direction of the arrow A.
3)
Remove the GL drive gear.
2.
Attachment procedure
1)
Coat the cam gear A and the GL drive gear with grease (1/2
drop).  (Refer to Fig. 2.)
2)
Refer to Fig. 1.   While adjusting phase of the GL drive gear as
shown, insert the GL drive gear into the GL drive shaft.  (Insert
it while moving the GL drive gear in the clockwise direction.)
3)
Insert the two claws of the gear cover B into the square holes
of mechanism chassis.
4)
Fix the GL drive shaft with the screw (M1.4 
×
 2) 1.  Be sure
that the gear cover B must not have any play.
Tightening torque: 0.059 ± 0.01 N•m (0.6 kg•cm)
Fig. 3-18
  
1
 Screw (M1.4 
×
 2)
Gear cover B
GL drive gear
3
 GL drive gear
Coaster-T block assy
Coaster-T block assy
In-phase markings of the 
coaster-T block assy
Cam gear B
GL drive shaft
Cam gear B
Coaster-S block assy
Coaster-S block assy
Cam gear A
Cam gear A
Insert them into the 
two grooves.
When attaching it, coat the hatched       portion 
with grease.
Hole of mechanism 
chassis
Cam gear A
Cam gear B
Hole of cam 
gear B
Hole of the GL 
drive gear
GL drive shaft
Phase adjustment of the GL drive gear
Fig. 2
Fig. 1
A
— 27 —
3-19.Drum Base Block Assy, Coaster-S Block Assy, Coaster-T Block Assy
1. Removal procedure
1)
Remove three screws (M1.4 
×
 2.5).
2)
Move the coaster-S block assy and coaster-T block assy out
from the drum base groove in the direction of the arrow A.
3)
Remove the drum base block assy.
4)
Remove the coaster-S block assy from the GL gear shaft-S.
5)
Remove the coaster-T block assy from the GL gear shaft-T.
2. Attachment procedure
1)
Insert a coaster-S block assy and coaster-T block assy into the
drum base groove.
2)
Place a drum base block assy on top of the mechanism chassis
assy.  Insert a coaster-T block assy into the GL gear shaft-T.
3)
Insert a coaster-S block assy in the oblique direction.  While
adjusting phase so that the spring of coaster-S block assy agrees
with the GL gear lever marking of the coaster-T block assy,
insert a coaster-S block assy into the GL gear shaft-S.
Note:
• There must be no phase difference.
• Do not remove coaster-S block assy and coaster-T block assy
from the drum base block assy.
4)
Determine the exact position of the drum base block assy that
has been tentatively placed, on the mechanism chassis assy.
Tighten the screws at A, B and C in this order.
Tightening torque: 0.059 ± 0.01 N•m (0.6 kg•cm)
Note:
Be careful that the position setting boss of drum base block assy
does not override on the mechanism chassis.
Fig. 3-19
Three screws (M1.4 
×
 2.5) 
Drum base block assy
Coaster-T block assy
Groove of drum base block assy
Coaster-S block assy
GL gear shaft-T
GL gear shaft-S
Coaster-S block assy
Coaster-T block assy
In-phase marking 
of coaster-T assy
Spring of coaster 
S block assy
Phase adjustment of 
coaster-S/T block assy
Phase must be 
adjusted exactly 
during installation
A
C
B
A
— 28 —
3-20.DC Motor (Capstan), Conversion Gear, Relay Gear
1.
Removal procedure
1)
Remove the three screws (M1.4 
×
 2) 1.
2)
Remove DC motor (capstan).  Remove belt from the pulley of
conversion gear.
3)
Remove conversion gear.
4)
Remove relay gear.
2.
Attachment procedure
1)
Coat relay gear shaft and conversion gear shaft with grease (1/
8 drop).  (Amount of grease must be strictly controlled.)
2)
With the larger gear of the relay gear positioned down, attach
the relay gear to the relay gear shaft.
3)
With the pulley side of the conversion gear positioned up,
engage the conversion gear teeth with the relay gear teeth, and
install them.
4)
Before installing the DC motor (capstan (including belt)), check
that belt is not twisted.  Hook a belt on the pulley block of
conversion gear.  Align three shafts with corresponding holes.
At this moment, confirm that belt does not override on the shaft.
5)
Install DC motor (capstan) with three screws (M1.4 
×
 2) 1 in
the order of A, B and C.
A
, B, C tightening torque
A
 tightening torque: 0.059 ± 0.01 N•m (0.6 kg•cm)
B
 and C tightening torque: 0.038 ± 0.01 N•m (0.4 kg•cm)
Note:
Be careful that gears and belts are not damaged or dust is not attached.
Be careful also not to splash grease.
Fig. 3-20
1
Three screws (M1.4 
×
 2)
DC motor (capstan) 
(including belt)
Conversion gear
Relay gear shaft
Conversion gear shaft
Relay gear
Belt must be completely 
free from twist or stain 
when it is installed.
When attaching it, coat the hatched        portion with grease.
A
C
B
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