OKIDATA Pacemark 3410, Service Handbook

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Interface/Motor Control LSI
Q5: B562 13497
This LSI controls the following functions listed below.
Space Motor Enable / Speed Control
To obtain the carriage speed instructed by the microprocessor, Q5 uses the signals
SP - Phase A and SP - Phase B, derived from space motor movement to generate the
pulse width timing and overdrive time.
Line Feed Motor Phasing Control
To turn the line feed motor in the proper direction, this LSI sends motor drive signals
(properly phased) to the line feed driver (TRA4).
Bail Motor Phasing Control
To turn the bail motor in the proper direction, this LSI sends motor drive signals
(properly phased) to the bail driver (TRA3).
Dot ON Timing signal generation
Q5 uses the signals SP - Phase A and SP - Phase B, derived from space motor
movement, to produce the signal IPT. This signal (IPT) is used to enable the print wires
at the desired carriage position.
Printhead / Bottom Tractor Feed Control LSI
Q2: B563 12597
This LSI enables the printhead drivers and is the interface between the bottom tractor feed unit
(BTFD PCB) and the MPU.
The functions of this LSI are described below.
Printhead Drive Control
Printhead drive correction modifies the drive time under the following circumstances:
Drive time correction for drive voltage fluctuations
Drive time correction for head gap setting.
Bottom tractor feed unit control
Pacemark 3410 2 - 3 Principles of Operation