Sharp VL-H870U, Service Manual

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5-7
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
5-5. MECHANISM ASSEMBLING AND PARTS REPLACEMENT
(DISASSEMBLING AND ASSEMBLING)
Below is given an explanation of assembling of mechanism and its parts replacement.
The removal of cabinet and Circuit Board is explained in the relevant service manual.
Notes
1 After removal of cut washers be sure to replace them with new ones.
2 Do not place the mechanism upside down on the table. Otherwise, the mechanism part may be deformed or damaged, resulting
in malfunction.
3 When assembling, take care so that screw, washer or other foreign substance do not enter. Otherwise mechanism malfunction
may occur.
4 Be sure to use the specified cleaning liquid, oil, grease and screw lock as listed below. Otherwise mechanism malfunction may
occur.
Oil:
Cosmo Oil Co., Ltd.
COSMOHYDRO HV100
Greases: Dow Coaning
MORYCOAT YM-103/X5-6020
Screw lock: THREE BOND
1401B
Cleaning liquid: Industrial-use ethyl alcohol
5-5-1. Mechanism modes
To actuate the mechanism, apply DC3 to 4V to the L motor. At this time the L motor connector must have been disconnected in advance.
Below is given an explanation of the mechanism mode necessary for mechanism check, adjustment and replacement.
(1). EJ (Eject) mode (See Figure 1)
In this mode, it is mechanically positioned to eject the
cassette. It is the position where the EJECT lever is moved
the farthest in the direction A in the S/B mode. (In this
mode, the cassette compartment assembly can not be
locked.)
(2). S/B (Standby) mode (See Figure 2)
When the cassette is loaded, the mechanism is set to the
S/B mode. In this mode the slide chassis is most far from
the drum. In this mode the Eject lever is in position shown
in Figure 2 (in position where the cassette control ass’y
can be locked).
Slide
chassis
EJECT
Lever
A
Slide
chassis
A
EJECT
Lever
(4). PB mode (See Figure 4)
In this mode, it is positioned for the replay, record and so
on. It is the mechanical position where the pinch roller is
pressed against the capstan shaft to make the pinch-
pressing spring the most longest.
(3). STOP mode (See Figure 3)
In the STOP mode the S.T pole base is depressed in the
STOP position (or Rec Lock position in CAMERA mode),
and the S brake is in contact with the S reel disk.
EJ mode
Figure 1
S/B mode
Figure 2
Figure 3
STOP mode
Figure 4
PB mode
S pole base
T pole base
S reel disk
S brake
Capstan
shaft
Pinch
Spring
Pinch roller