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3.2 Replacement of major parts
3.2.1 Before starting disassembling (Phase matching be-
tween mechanical parts)
Before starting disassembling (Phase matching between me-
chanical parts)
The mechanism of this unit is closely linked with the rotary en-
coder and system controller circuits.
Since the system controller detects the status of mechanical op-
eration in response to phases of the rotary encoder (internal
switch positions), the mechanism may not operate properly un-
less such parts as the rotary encoder, control plate, loading arm
gear, control cam, cassette gear, limit gear,
relay gear and drive gear are installed in their correct positions.
Especially, this model is not provided with any cassette housing
assembly, so that cassette loading and unloading must be ac-
complished by operation of the cassette holder assembly. The
latter is in turn driven by such parts as the drive gear, relay gear
and limit gear. Exercise enough care, therefore, to have the
phases of all this gear matching one another. (For information on
phase matching of the mechanism, see the instructions on how
to install individual parts.)
This unit is provided with a mechanism assembly mode. It is
therefore necessary to enter this mode for assembling and dis-
assembling procedures.
This mode is usually not in use, manually set it when it is re-
quired.
3.2.2 How to set the "Mechanism assembling mode"
Remove the mechanism assembly and place it bottom side up.
(See SECTION 2 SPECIFIC SERVICE INSTRUCTIONS.) Turn
the worm gear toward the front so that the guide hole of the con-
trol cam is brought into alignment with the hole at the mechanism
assembly chassis. This position renders the mechanism assem-
bling mode operational. Make sure that the control plate is locat-
ed in alignment with the mark E. (See Fig.3-2-2a.)
Worm gear
Control plate
Fig.3-2-2a
Chassis hole
Guide hole
Control cam
Mark E
3.2.3 Cassette holder assembly
3.2.3.1
How to remove
(1) Remove the guide rail and roller cam assembly. (See
Fig.3-2-3a.)
(3 lugs on the guide rail and one lug on the roller cam as-
sembly)
Lugs
Fig.3-2-3a
(2) Remove the two slit washers and remove the cassette
housing bracket. (See Fig.3-2-3b.)
(3) Remove the opener guide, spring(A), door opener, relay
gear and limit gear. (See Fig.3-2-3b.)
Relay gear
Door opener
Fig.3-2-3b
(4) While swinging the lock levers (R) and (L) of the cassette
holder assembly toward the front, slide the cassette holder
assembly until its legs come to where the guide rail and the
roller cam assembly have been removed (so that the drive
arm is upright). (See Fig.3-2-3c.)
Cassette holder assembly
Fig.3-2-3c
Guide rail
Roller cam
Lug
assembly
Lug
Limit gear
Spring(A)
Opener guide
Slit washers
Cassette housing bracket
Drive arm
Lock lever (L)
(Upright)
Leg
Legs
(No.82933)1-19
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