Pioneer ct 7 r service manual

Page 2

cT-7n/Bn

1 . MECHANICAL DESCRIPTIONS

1.1 Mechanism Operation When the mechanism, presently in the FWD-
Thé various mechanical sections of the recorder PLAY mode, is switched to the REV-PLAY mode,
are operated using the capstan motor to provide a direction operation is required, then the mecha-

the driving force. The various modes are activated nism will make the transition following the steps
by solenoid L and R, and these are controlled by listed below. (Refer to Fig. 1-2).
commands from CPU PD6006.

Both the capstan and reel-motor are direct-
drive motors fitted with a Hall sensing element.
Reel-motor L and reel-motor R (hereafter called
RM L, RM R) are used exclusively for tape take-up
in the FF, REW, PLAY, and REC/PLAY modes.
The direction of rotation and rotational speed of
these motors are controlled by commands from
CPU PD6006.

The right side capstan motor is the DD type, and
the left side capstan motor is belt-driven by the
right side-motor. A sub-rotor acts as the actual
capstan. (Refer to Fig. 1-1).

The mechanism forming the right and left-hand
side of the unit is essentially symmetrical in
configuration, and in forward and reverse (here-
after abbreviated FWD, REV) operations, each

Solenoid L. Solenoid R

Fig. 1-1 Mechanical construction

side acts together. This description covers the FWD 2 REV
mechanical operations for FWD movement. I. ' STOP STOP
1
I Basic Operations of the Mechanism $
. . . .
The mechanism assumes three different states. I "9 PAUSE REV MUSE
STOP, PAUSE, and PLAY. Consequently, since it I.
can travel in the FWD and REV direction, there I
are a total of six states possible. There is also a I
direction operation for switching between FWD LFVD REV
and REV travel. Transition between the FWD PLAY PLAY
and REV state will be described using only one
example. Fig. 1-2 Mechanism mode transition (example)
Mochmlun Mode rnmmon Flow Sme ' Mode
i-> FWD STOP REV srop <1 s'roemm STOP, DIRECTION (DIR)
I 8 I: I
I I
I I
I FWD REV 1 PAUSE, PLAY/PAUSE,
I PAUSE 55 ; PAUSE mes REC-PLAY / PAUSE ,
f I FF, new.
I I
' I
I F D REV
- w PLAY PLAY J PLAY sun PLAY, REC/PLAY.

Fig. 1-3 Mechanism mode transition flow and modes