Ribbon Feed Motor External Fan Control Drive Circuit

Figure 2-21 shows a block diagram of the ribbon feed motor control/drive circuit.

The ribbon feed motor is a PM type pulse motor driven with 2-2 phase excitation, which can be driven in either the forward or reverse direction and stopped at any position. The phase signals output from two pins are expanded by the predrive circuit, output from four pins, and transmitted to the driver board.

The hold/run signal (RF H/R, which is the common voltage RFCOM switching signal) is output from the

E05A16GA.

The drive voltage is a constant 36.5 VDC from the VP3 line.

The common line for the ribbon feed motor is connected to the external fan drive line. Therefore, the external fan always operates when the ribbon motor operates.

Table 2-20 shows the circuit specifications.

Table 2-20. Ribbon Feed Motor Control/Drive Circuit Specifications

Ribbon Feed Motor

External Fan

Supply voltage

36.5 ± 1 VDC

36.5 ± 1 VDC

Current consumption

0.10 A (average)

70 mA (average)/90 mA (max.)

Drive frequency

720PPS

Driving method

constant voltage drive, 2-2 phase excitation

RFCOM (COMMON)

MAIN BOARD DRIVER BOARD

Figure 2-21. Ribbon Feed Motor Control/Drive Circuit Block Diagram

RFCOM (COMMON)

RF MOTOR

EXTERNAL FAN

MAIN BOARD DRIVER BOARD

Figure 2-21. Ribbon Feed Motor Control/Drive Circuit Block Diagram

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