Gear Section - Panasonic KX-FM89BX Service Manual

When the motor suspends while it is in the receive mode (about 70~80 msec), pin 163 of ASIC
IC501 becomes a low level and Q503 turns off. Then Q501 also turns off, and instead of +24 V, +
5 V is supplied through D501 so that the motor is held in place. When the system is in the stand-
by mode, all of the motor drive transistors turn off. Consequently the motor current stops.

6.4.6. GEAR SECTION

This model provides a motor-driven gear mechanism for transmitting/copying documents and
printing fax data. In this chapter, you will see how the gears work to select and operate a mode
and how the gear section, sensors and rollers mechanically work during the main operations
(FAX transmission, FAX reception and Copy).
6.4.6.1. MODE SELECTION (See Fig. 1)
When a motor with Drive Motor Gear attached rotates counterclockwise (CCW), Swing Gear C
engages CAM Gear to rotate counterclockwise (CCW). This operation provide four mode
options (A: Transmit mode, B: Paper-Pickup mode, C: Receive mode and D: Copy mode)
selected by the Sensor Switch. (The Sensor Switch Lever's position in the CAM Gear controlled
by the software selects a specific mode.) You can see which mode is selected by confirming the
Mode Marker's position as shown in / Fig. 1-a~1-d.
(Ex. If the Mode Marker is in position A, a transmit mode is selected.)
Note:
The arrows show the directions in which the active gears turn around.
Fig. 1: Mode Selection
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