How To Operate The Mechanism Manually - Hitachi VM-H675LA Service Manual

3.

HOW TO OPERATE THE MECHANISM MANUALLY

CAUTION
Perform this procedure for emergency only when
normal loading or unloading is not possible because
the electrical circuits or loading motor is defective.
(1) Remove the r-case assembly. (See Figs. 2-4-1,
2-4-2)
(2) Disconnect connector (CN604) from PG604 on the
VCA circuit board, and supply 4V DC to CN604
(directly to the loading motor). (See Fig. 3-1)
Connecting CN604 brown wire (+) and red wire (-)
results in unloading.
Connecting CN604 red wire (+) and brown wire (-)
results in loading.
Note: To unload the mechanism with a tape inserted,
manually turn the capstan motor simultaneously
to take up the tape.
If loading or unloading does not occur even when 4V DC is
directly supplied to the loading motor, perform the follow-
ing procedure:
(3) Remove the camera chassis assembly and rear
cover. (See Fig. 2-6)
Note: Note that it is difficult to remove the rear cover.
VCA
CIRCUIT
BOARD
PG604
Fig. 3-1
(4) Disconnect 3 flat cables. (See Fig. 3-2)
(5) Disconnect connector. (See Fig. 3-2)
(6) Remove 1 screw holding the head shield. (See Fig.
3-2)
(7) Disconnect 2 flat cables. (See Fig. 3-2)
(8) Remove 3 screws. (See Fig. 3-2)
(9) Remove the UH mechanism in the direction of the
arrow from the r-case. (See Fig.3-2)
(10) Remove the cassette lid and top cover. (See Figs.
2-3-1, 2-3-2)
CN604
R-CASE
VCA
CIRCUIT
BOARD
DISCONNECT
CONNECTOR
DISCONNECT
TWO FLAT
CABLES
REMOVE
ONE
SCREW
(11) Release 2 tabs and pull out the loading motor from
the loading motor holder. (See Fig. 3-3)
Note: The above removal is different from normal
removal. In normal circumstances, remove the
loading motor assembled with the loading motor
holder. (The loading motor and loading motor
holder comprise an assembly.)
(12) Turn over the mechanism. (See Fig. 3-3)
Note: Do not turn over with the idler cover removed.
(13) Use a flat-bladed screwdriver, etc. to turn cam gear
(A) or (B). (See Fig. 3-3)
Turning it in the direction of the arrow will unload the
mechanism, and turning it in the opposite direction to
the arrow will load the mechanism.
Notes: 1. Be careful not to damage the cam gears.
2. To unload the mechanism with a tape inserted,
manually turn the capstan motor simultaneously
to take up the tape.
UH
MECHANISM
REMOVE
THREE
SCREWS
MECHANISM
FRAME
DISCONNECT
THREE
FLAT CABLES
Fig. 3-2
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