Mechanical Description Of Each Model; Description Of The Mechanism Driven By Cam Wheels (L) & (R) - Akai HX-RS Service Manual

VI. MECHANICAL DESCRIPTION PART FOR EACH MODE
6-1. DESCRIPTION OF THE MECHANISM DRIVEN BY CAM WHEELS (L) & (R)
CAM MOTOR
PULLEY CAM SLIT
PHOTO SENSOR A ( PH2)
PHOTO SENSOR B (PH3)
0
'
/
-r
I
CAM WHEEL (L)
LED (D9O2)
( Located on DETECTOR (Bl PCB
FAN- SHAPED HOLE
~ --
~ ' ,
,'
\
/)
'
0
J
-'r-il ,'
-
/
~ - -
CAM WHEEL (R)
SW LEAF MODE
(CAM DIRECTION SW SW9O5)
Fig. 6-1 Cam Wheels (L) & (R) Drive Mechanism (Front View)
Cam Motor Pulse Input
(IC I pin
(6))
Cam Direction Detection Input
(IC I pin
(3j )
6-1-1.
The sequence of this transmission is as follows.
(Refer to Fig. 6-1)
CAM MOTOR .... BELT CAM .... PULLEY CAM SLIT
.... CAM WHEEL (L) .... CAM WHEEL (R)
6-1-2.
CAM MOTOR is driven by IC5 (BA6109) on
SYSCON PCB and this IC5 is controlled by the various
control signals from various detectors and switches
through the action of Ml-COM IC! (LM6402H-l 90).
6-1-3.
PULLEY CAM SLIT is driven by BELT CAM
and drives CAM WHEEL (L), and the slits on PULLEY
CAM SLIT are used for the detection of CAM MOTOR
PULSE and CAM DIRECTION.
6-1-4.
CAM WHEELS (L)
(R)
contain grooves to shift 8
mechanical parts shown in Figs. 6-5 & 6-6, which exe-
cute all the operations such as;
I) Shifting Head block up and down.
2) Shifting Pinch Rollers up and down.
3) Rotation of Reel Tables.
4) Rotation of Head (for FWD & REV modes)
H H
IL
:L
I
I
I
IH
I
I
I
I
I
I
I
1L
I
I
I
I
I
+I +I -1 -1
-,
UP UP DOWN DOWN DOWN
Fig. 6-2
6-1-5.
SW LEAF MODE is used for the detection of the
current CAM WHEEL position.
It
is "ON" during
REV /FF modes and "OFF" during FWD/REW modes .
6-1-6.
DETECTORS A, Bare usd for the detection of
STOP mode. TR902 is "ON" during STOP mode.
6-1-7.
PHOTO-SENSOR A (PH2) is used for the detec-
tion of CAM MOTOR PULSES, and tog~ther with
PHOTO-SENSOR B, its count sets up the position of the
CAM WHEELS.
6-1-8.
PHOTO SENSOR B (PH3) is used for the detec-
tion of CAM direction. That part of the CAM MOTOR
PULSE in which the pulse changes from "H" to "L" is
used for counting up
(+)
and down(-) as indicated in Fig.
6-2 to set up CAM WHEELS (L) & (R).
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