Stepper Motor - UBI EasyCoder 501 Service Manual

UBI EasyCoder 501 – Service Manual
8. PRINT UNIT, cont'd.
8.4

Stepper Motor

#T20 Torx Screws
Stepper Motor
Bracket
(to Pressing Roller)
The stepper motor drives the pressing roller via a short belt and the
ribbon return roller and the ribbon rewind unit via another – longer
– belt. A freely rotating pulley attached to the printer's centre-line
wall makes the outside of the longer belt drive the ribbon return
roller.
The stepper motor is fitted by means of two #T20 Torx screws to
a bracket, which in its turn is attached to the print unit gable by three
#T20 Torx screws. When fitting the stepper motor to the bracket,
check the tension of the belt to the pressing roller before the screws
are tightened. The bracket does not need to be dismantled for
replacing the stepper motor or the belt.
The pulleys of the stepper motor are glued to the motor's shaft.
The stepper motor is connected to P-401 on the CPU board.
Belt
#T20 Torx Screws
Belt to Ribbon Rewinder
and Ribbon Return Roller
Inner Print Unit Gable
Fitted to
centre-line
wall
Fitted on
Return Roller
Shaft
Fitted on
Pressing Roller
Shaft
44