Chapter 2
Maintenance
Chapter 2 Contents
2-1 Introduction ...................................................................................................................................... 2-3
2-2 Disassembly procedures ................................................................................................................ 2-4
2-2-1 Removing the bulk stacker from the printer.................................................................................... 2-5
2-2-2 Removing the covers ...................................................................................................................... 2-6
2-3 Adjustment of the belt tension ....................................................................................................... 2-7
2-3-1 Drive belt......................................................................................................................................... 2-7
2-3-2 Feed belt......................................................................................................................................... 2-8
2-1 Introduction
This chapter explains the following subjects:
Section 2-2 explains with illustrations the procedures required to disassemble the bulk stacker for
replacement of parts.
Section 2-3 explains how to adjust the tension of the drive and feed belts.
2-3
ST-20
2-2 Disassembly procedures
This section provides procedures for disassembling of the bulk stacker. When replacing parts for
which there is no specific procedure described, refer to Parts Catalog.
Before starting, be sure to read the notes below.
Before removing the bulk stacker from the printer (the printer is mounted atop the bulk stacker),
be sure to turn off printer power and disconnect the power cord of both the bulk stacker and
printer.
Be sure to use the correct screws when installing a component. Using incorrect screws can result
in the threads of the screws being stripped, which may lead in turn to other problems. Frequent
insertion and removal of self-tapping screws can cause damage to screw holes. Do not tighten
screws excessively.
When removing or installing circuit boards, wear a grounded wrist strap to protect against damage
due to discharge of static electricity.
ST-20
2-4
2-2-1 Removing the bulk stacker from the printer
To start disassembly, begin with removing the paper handler/stacker from the printer. To remove
the paper handler/stacker, see figure 2-2-1 below.
CAUTION Before proceeding, turn printer power off and disconnect the power cord of
both the bulk stacker and the printer.
Unhook these hooks off of the printer’s back panel.
Printer
Paper handler/stacker
(HS-20/HS-21)
Stacker
Figure 2-2-1 Removing the paper handler/stacker from the printer
2-5
ST-20
2-2-2 Removing the covers
T o remove the top plate, left and right covers, remove screws as shown below. Note that the left and
right cover are the same ones.
Top plate
ST-20
Left side cover
Right side cover
Figure 2-2-2 Removing the covers
2-6
2-3 Adjustment of the belt tension
The bulk stacker has several driving belts. For the optimum bulk stacker performance, the tension
of the belts should be specifically adjusted proper values.
2-3-1 Drive belt
The drive belt is located on the right side of the bulk stacker frame. The tension of the belt is
adjusted be moving the mounting position of the motor back and forth as follows.
Apply a force of 2.94 N/cm2 to the center of the belt.
The flexure length of the belt should be 2 to 4 mm. If necessary , loosen the screws securing the feed
motor and adjust the tension of the belt.
Mounting screws
Motor pulley
Drive belt
A=2 to 4 mm
(2.94 N/cm
Figure 2-3-1 Adjusting the drive belt tension
2
)
2-7
ST-20
2-3-2 Feed belt
The feed belt is located on the left side of the bulk stacker frame. The tension of the belt is adjusted
be moving the tension adjuster bracket back and forth as follows.
Apply a force of 4.9 N/cm2 to position B on the belt.
The flexure length of the belt should be 15 to 17 mm. If necessary , loosen the screw securing the
tension adjuster bracket and adjust the tension of the belt.
Bulk stacker left side
Feed belt
B=15 to 17mm
(4.9 N/cm
2
)
Tension adjuster bracket
Bracket mounting screw
Figure 2-3-2 Adjusting the feed belt tension
ST-20
2-8
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