79
Ribbon Motor Driver Circuitry
The ribbon motor is a 4-phase stepper motor, driven by double-phase, and controlled by
BBG020.
During standby, transistor Q5 is turned OFF and Q6 is turned ON so that the ribbon motor is
supplied with standby current from the 40 V power line through R205 and R207. This standby
current is necessary to stop the ribbon motor smoothly.
When the RBDR0 signal(U24/24) goes HIGH, current is supplied to the ribbon motor through
Q5. Thereafter, each phase is turned ON or OFF, in turn, to revolve the ribbon motor.
Содержание Accel-7350
Страница 1: ...1 Accel 7350 Dot Matrix Printer Service Manual Document 130034 ...
Страница 24: ...23 Wiring Diagram ...
Страница 25: ...24 Control Diagram ...
Страница 35: ...34 Dots Missing Caution Do not touch the print head immediately after printing because it may be too hot ...
Страница 36: ...35 Extra Dot Printing Improper character ...
Страница 37: ...36 Incorrect Printing Irregular print data ...
Страница 38: ...37 No LCD Display Half of the LCD lights up ...
Страница 39: ...38 No LCD Display Completely blank ...
Страница 40: ...39 Control Keys Not Functioning ...
Страница 41: ...40 No Buzzer Abnormal Ribbon Feeding Causing abnormal carriage movement ...
Страница 42: ...41 No Line Feed or Inconsistent Line Feeding ...
Страница 43: ...42 Carriage Error ...
Страница 44: ...43 ...
Страница 46: ...45 Cover Open Error Will Not Cancel With Cover Closed ...
Страница 47: ...46 No Fanfold Paper Reverse Line Feed ...
Страница 48: ...47 Printing Does Not Stop After Paper Is Ejected ...
Страница 49: ...48 Not Powering Up ...
Страница 94: ...93 Indicator Circuit ...
Страница 95: ...94 I F Circuit ...
Страница 96: ...95 Slide SW Circuit ...
Страница 97: ...96 Power Circuit ...
Страница 98: ...97 Exploded View 1 6 Following pages require Legal size paper for printing ...
Страница 99: ...98 Exploded View 2 6 ...
Страница 100: ...99 Exploded View 3 6 ...
Страница 101: ...100 Exploded View 4 6 ...
Страница 102: ...101 Exploded View 5 6 ...
Страница 103: ...102 Exploded View 6 6 ...
Страница 119: ...126 ...