Motor Driver Pwb - Hammond Leslie 3300 P Service Manual

D. MOTOR DRIVER PWB (LGH-43A)
The LGH-43A is a DC Servo-Motor-Drive circuit-board and controls the motors at the Speed
Control Terminal (CN3-5) and the Brake Terminal (CN3-9). It also sends the rotation information
by the Rotation Pulse to the CTH-37A from the CN3-1.
The approximate Speed Control Voltages are [0.7VDC] at Slow, and [7.0VDC] at Fast.
Pay particular attention in making the correct connection of the Horn(UP)Connector (5-pin-PINK)
And the Drum (LOW) Connector (5-pin-RED).
If the connection is not correctly made, the control of Rise Time on the drum side is not possible.
On the PWB, the over-current-protective circuit is built-in, which stops the motor rotation in
case the load on the motor is abnormal, but it will function normally by re-switching the power ON
after removing the excessive load.
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#3300P