Rev. A Product Overview Appendix D-59
TM-H6000/H6000P Service Manual
Confidential
The drive signal to drive the phases is sent at the logical level of the PHASE1, 2 terminals. The
motor driver cannot operate unless signal 24VSW1 in the circuit diagram is set to HIGH
(controlled by the GA). When this signal is at a status other than HIGH, IC consumption is 0,
and no electricity goes to the motor.
Slip Paper Feed Motor Drive Circuit
The slip paper feed motor is two-phase stepping motor. The driving method is 1-2 phase
excitation during acceleration and deceleration, and constant-current drive is performed with
2-2 phase excitation. Therefore, a dedicated constant-current drive chopping driver (U17,
A2917SEB made by Alegrow) is used.
Figure D-59
The circuit configuration is the same as the carriage motor driver, but the current setting is fixed,
and is changed between two levels by the output (PF_HOLD) of the GA (U30) port. The current
calculation procedure is described below.
Current = VREF/(10 ✕ Rs)
RS: 1Ω
VREF: VCC or voltage obtained by voltage division ratio of R105 and R106.
As for the carriage motor drive circuit, the driver IC is operated by setting the 24VSW1 signal
HIGH.
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