Control Signal; Signal Level Of Motor Circuit - Toshiba 1550 Service Manual

6.4.2

Control signal

(1) MAIN-CW/CCW (LGC
This is a signal to change the direction of rotation of the main motor. When the CW/CCW signal is at
"L" level, the main motor rotates counterclockwise when viewed from the rear, and drives the devel-
oper, drum and heat roller in the designated direction.
(2) PLL-OK signal (MTR
When the FG pulse cycle difference against the reference frequency is within the range of +4.6%
and –5.3%, it is defined as the lock range (normal state), and the signal becomes "L" and LED
"ED1" comes ON.
(3) MTR-BRK signal (LGC
This is the signal to control the speed of the main motor. The brake is applied to the main motor
when the signal becomes "L" level.
(4) MAINMTR-ON signal (LGC
This is a signal to turn ON/OFF the main motor. The main motor turns when this signal becomes "H"
level.
(5) MOT-FG signal
This signal generates FG signals while the motor is rotating.

Signal level of motor circuit.

MAIN-CW/CCW
PLL-OK
MOT-FG
MTR-BRK
MAINMTR-ON
The signals are respectively the level on the input/output pins of
IC1 and 3.
Mar. 1998 © TOSHIBA
MTR: Input)
LGC: Output)
MTR: Input)
MTR: Input)
Signal name
CW direction
Control deficiency
Brake OFF
Motor ON
"H" level "L" level
CCW direction
Normal
Rotation pulse signal
Brake ON
Motro OFF
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