Print Mechanism

TM 11-7025-233-23

c. Print Mechanism. The print mechanism (fig. 1-3) is mounted on the frame and

drive assembly and consists of the carriage assembly, encoder assembly, carriage

servo drive board (T3SD/1), print head, and ribbon drive motor.

Frame and Drive Assembly - Modular assembly, replaceable as a unit, mounted on

the bottom cover, and supports the print mechanism.

Bottom Cover - A support assembly, replaceable as a separate unit. On it are

mounted the power supply assembly, frame and drive assembly, logic and 2K

buffer boards, control panel, and RS-232C data set cable panel.

Carriage Assembly - Supports and moves printhead along guide rails.

Encoder Assembly - Consists of a dc servo motor which drives the print head

assembly, and an encoder circuit board which senses motor position and allows

for character spacing of 10, 13.2, and 16.5 characters per inch.

Carriage Servo Drive Board (T3SD/1) - Controls carriage servo drive motor.

Print Head - A servo-positioned dot matrix print head which forms characters by

selecting dots to be printed from an array of 63 possible dot locations for

each printed character.

Ribbon Drive Motor - Stepper drive motor which drives ribbon only while

carriage is in motion.

Figure 1-3.

Print Mechanism

1-6