Teac C-1 User Manual

TAPE TRANSPORT SECTION
2-2 SOLENOID DRIVE CIRCUIT
Three solenoids are incorporated in the C-1. Their func-
tions are as follows:
Head Solenoid - Pulls the erase and R/P heads into the cas-
sette, so as to make contact with the tape. It also pulls
the pinch roller to the pause position.
Brake solenoid - Removes the brake from the reel table.
Pinch solenoid - Pushes the pinch roller into contact with
the captsan shaft to run the tape.
Notes:
Each of the above solenoids is actuated by a relatively high
voltage (+24V) and then maintained at a lower voltage
(+10V).
This two-stage solenoid operating system applies a greater
motivating force to the solenoid plunger when it is first
activated, but maintains the solenid in operation at a lower
voltage so as to prevent unnecessary temperature rise in the
solenoid. The maximum voltage applied to the solenoids for
extended periods is limited to 12V.
* * *
HIGH AT
PLAY MODE
HEAD SOLENOID
DRIVER
HIGH AT R534!
PAUSE MODE
BRAKE SOLENOID
DRIVER
Operation of the solenoid drive circuits are described in
the PLAY and PAUSE modes as an example.
Refer to Fig. 9. In the STOP mode, both pins 17 and 18 of
USO1 (SYS-CON) are at the low level, and each part of the
circuit is in the following state.
Q522,Q531 OFF => Head solenoid OFF
C521 is charged.
Brake solenoid OFF
C522 is charged.
Q524,Q525,Q5340N ~ Potencial at the point (A)
approx. +33V
Q523,Q532 OFF -
Q526 ON
Q527,Q533 OFF > Pinch solenoid OFF
C532 is charged.
Q529, Q530,Q535ON > Potencial at the point (B)
approx. +33V
In the PLAY mode, a high level signal is output from pin
17 of USO1. Q522 and 531 are turned on by the current in
route (1). Q523 and Q532 are turned on by the current in
+24V
(+33V NO LOAD)
+10V
HEAD
SOLENOID
®
BRAKE
SOLENOID
prince SOLENOID
ORIVER
D691 PINCH
SOLENOID
T-1294
Fig. 9 Solenoid Drive Circuit

Teac C-1 Specifications

General

Brand	Teac
Model	C-1
Category	Cassette Player
Language	English