Sharp VB-500/A/BG User manual

VB-500/A/BG
SHARP
SERVICE
MANUAL
SERVICE-HANDBUCH
\
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SY5K5VB500G//
ELECTRONIC WHITE BOARD
ELEKTRONISCHE SCHAUTAFEL
MODEL/MODELL
VB-500/A/B iG
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only
parts identical to those specified should be used.
tm Interesse der Benutzer-Sicherheit (verlangt von den Sicherheitsvor-
schriften einiger Lander) sollte das Gerat wieder auf seinen urspringli-
chen Zustand eingestellt und nur die vorgeschriebenen Teile verwen-
det werden.
SECTION/TEIL I
CONTENTS
ON OARPWN>
1.
2.
3.
4.
5.
6.
7.
8.
SHARP CORPORATION

B-500/A/BiG
IMPORTANT SERVICE NOTES
BEFORE RETURNING THE ELECTRONIC WHITE e
BOARD
Before returning the electronic white board to the
user, perform the following safety checks.
1. Inspect all lead dress to make certain that leads
are not pinched or that hardware is not lodged
between the chassis and other metal parts in the
electronic white board.
. Inspect all protective devices such as non-metallic
control knobs, insulating materilas, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor/capacitor networks, mechanical
insulators etc.
. To be sure that no shock hazard exists, check for
leakage current in the following manner.
@ Plug the AC line cord directly into a 200 ~ 240V
AC outlet (Do not use an isolation transformer
for this test).
VTVM
© AC SCALE O
O.15uF
TEST PROBE () connect TO
KNOWN EARTH
TO EXPOSEO \ GROUND
METAL PARTS
Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15yF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as a water pipe or conduit.
Use a VTVM or VOM with 1000 ohm per volt., or
higher, sensitivity to measure the AC voltage drop
acros the resistor (See Diagram).
Move the resistor connection to all exposed metal
parts having a return path to the chassis (antenna-
connections, metal cabinet, screw heads, knobs
and control shafts, etc.) and measure the AC
voltage drop across the resistor. Reverse the AC
plug (a non-polarized adapter plug must be used
but only for the purpose of completing these
checks) on the set and repeat the AC voltage
measurements for each exposed metallic part.
Any reading of 0.45V rms (this corresponds to
0.3mA rms AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the electronic white board to the
user.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO WET LOCATIONS.

VB-500/A/B
1. FEATURES
1) Remote controlled operation
2) May be stopped at any point using <J> and stop
keys.
3) In addition to 1-frame copy, compressed copying is
AVAILABLE for A 2 frame consecutive copy and A 4
frame copy.
4) Direct selection of A desired FRAME 1 to 5. (FRAME 5
cannot be copied.)
5} Additional printing can be made even after comple-
tion of printing. (Last Copy IN MEMORY.)
2. SPECIFICATIONS
WHITE BOARD
Board Surface Size 92.0 x 128.0 cm
(36-742 x 50-% inches)
Effective Width of
Board Surface 88.0 x 124.0 cm
(34-242 x 48-1%6 inches)
Number of Frames 5 Frames
Number of Copyable
Frames 4 Frames
RECORDER
Recording Paper Heat sensitive recording paper
Copy Size A4 size (210 x 297 mm)
Copy Speed 20 sec/sheet (ist copy)
10 sec/sheet (From 2nd copy)
5.9 dots/mm
1 ~ 99 (Number of copies can be
increased by pushing the addi-
tional printing key.)
Copy Color Black
Recording Density
Number of Copies
Picture Memory One white sheet (256 KB)
Outside Dimensions 149.0 (W) x 66.3 (D) x 196.5 (H)
(58-232 xX 26-Ve X 77-1V32
inches)
Weight Approx. 65 kg (143 LBS.)
Power Source AC200-—240V (50/60 Hz}
Power Consumption Approx. 180 W during operation
BTU: Approx. 90 W during stand-by
ACCESSORIES
Heat sensitive recording Paper ..........cccesseeeseeeenenes 1
Markers (Black, Blue, Red) ..........ccscccccccseessnseeeereees 1 Each
EASOR eecsvcsuvstccaciecienisitevizsicesedtvasedivaiecgers oussuatiauevedne 1
MQ MG t sisi ccccssetdicsecepaseciearcasseencand covsscuvsaizeccesseviariasees 1
Remote control transmitter ..........ccccccssseeessreeeeeeenees 1
Battery: sissivisvs sostaseesssacsvsvess indeessivedanvesscecswiasadecstess cee 2
Instruction Manual o........ ce eeeesssseesseeceereesesseseeeeseenes 1
Manual for Unpackaging and Assembly ........... 1
*Specifications subject to change without notice

B-500/A/BIS
3. EXTERNAL COMPONENT IDENTIFICATION
FRONT
White Sheet
REAR
Recording Paper -
Cover
Printer Cover
Tray Ass’y Part ‘A’
Tray Ass’y Part ‘B’
Magnet
Fixing Area
?
Caster
Figure 1
RS |
BSS
Printer
Cross Bar ‘A’
AC Power Cable
Figure 2
4
Remote Control
Signal Receiver
Display
Remote Control
Unit Holder

VB-500/A/Bid
4. INTERNAL COMPONENTS AND OPERATIONAL DIAGRAMS
CCD
PWB
&
OPTICAL
ASSY
Position
Sensor
Unit
Fluorescent Lamp
Main PWB Power Supply ;
PWB — Frame Sensor Unit
Figure 3 Internal Component Locations
Thermal
Printer
Electronic
Fluorescent Lamp Circuit
Sheet Forwarding
tepping Motor
eiPepne ~ Sheet Rewinding Stepping
WY L Motor CCD
Ain ae -
Rolled Sheet Signat Receiver
Operation
Panel
Remote Control
Remote Control
Signal Transmitter
Figure 4

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5. ADJUSTMENTS
MEASURING INSTRUMENT AND TOOLS
Dual Trace Oscilloscope
Hexagon Wrench for CCD Adjustment (JIGDRIVER-7)
1. ADJUSTMENT OF MOTHER PWB DIP SWITCHES
Switch configuration
and pin No.
ON OFF
4; C9
Location of dip switches
on motor PWB~. 3! cc
Figure 6
SPECIAL TOOLS
Name
Name of Switch
VB-500/A/Bi
Switch Condition
OFF ON
For factory setting
For factory setting
Normal/Checker
Normal Checker
Code
Normal/Adjustment
Normal Adjustment
Configuration
Hexagon Wrench for CCD Adjustment
JIGDRIVER-7

B-500/A/B&
ADJUSTMENT PATTERNS
Set to the bottom of
the sheet and stick there.
(A) (B)
Width 9mm
(Shallow mark)
Draw 3~5 horizon-
tal lines with a red
marker at the top,
center and bottom
of the sheet.
Adjust to
the sheet.
(C)
a crossing on the
sheet
Draw approx. 5cm vertical lines with a marker
at 8mm from each crossing, at the top, center
and bottom, in the left side.
Figure 7
Draw horizontal
line with a mar-
ker at 25mm
from the bottom
of the first sheet.

VB-500/A/B
2. FUNCTION OF CCD PWB COMPONENTS AND TEST POINT LOCATIONS
Main PWB
GND TP4
CCDOUTPUT TP3
PR
Reference pulse for
read-out range (TP1)
[] J ue
Lens holder
LPR NB RA
Figure 8
Angle adjustment plate
CCD PWB
Adjustment of read-out
position (angle adjustment)
Adjustment of read-out range in vertical
direction. Keep the screw Loose
and turn the hexagon nut.
Turn the hexagon nut
while keeping the
rotational adjustment
screw Loose.
Figure 9
Angle Adjustment Plate
Light Volume
Adjustment Plate
Angle Adjustment ang
Screw 1
t
Lens
Fixing
Screw
Lens
1
od
NX
)
Lens Focus
Adjustment
CCD
PWB
Lens
Holder
Franie
Figure 10

B-500/A/BG
3.
CCD Adjustment
Adjustment
Pattern
Adjustment Procedures
@ Preliminary Adjustment
Turn on dip switch 1 and the
power switch.
Check the output waveforms of
TP1 and TP3 with an oscilloscope.
Oscilloscope Range
0.5msec 2V/div
®
Make a preliminary adjustment of the lens focus, so that the
CCD output can be obtained which corresponds nearly to the
reference pulse width within the read-out range.
Set the gain control at Min position. Keep the light volume
adjustment plate in the open state. Fix each screw lightly.
Short-circuit R223 and R226 of CCD PWB. Keep the optic axis at
lower than the saturation point (to ensure no variation).
@ Adjustment of Lens (Focus Dis-
tance) short-circuit R223 and R226
Make the adjustment so that the checkers of the white sheet or
the marking will become deepest against the level of white. Fix
the lens by tightening the screws.
Oscilloscope Range 0.5msec 2V/div
® Adjustment of Read-Out Range
Short-circuit R223 and R226.
Adjust the left edge of the TP1
pulse to the marking 25 mm dis-
tant from the bottom end of the
white sheet by turning the hex-
agon nut @ of Figure 9. Then fix
the nuts @ and @.
TP1 Reference pulse
-out
{ of sheet ]
1 1
TP3 1
« Signal
25 mm mark Make adjustment by turning
the hexagon nut of CCD PWB,
and fi j
Haadcubeanga ix after adjustment.
Osilloscope Range 0.2msec 2V/div
@ Adjustment of Optic Axis
(Angle Adjustment)
Short-circuit R223 and R226.
Turn the screw © of Figure 9 until
the mark in the center of pattern ©
comes down to the lowest posi-
tion. When viewed from the lens
side, the read-out position is 8 mm
closer to the board from the area
brightened by reflection of fluores-
cent lamp.
SS Reference pulse
Area with reflection
of fluorescent lamp
Make adjustment by turning the
angle adjustment screw so that
the mark in the middle comes to
the center of waveform (read-out
reference pulse).
8mm
Adjustment position
Osilloscope Range
0.5msec 2V/div
10

CCD Adjustment
Adjustment
Pattern
Adjustment Procedures
VB-500/A/B&
© Adjustment of Rotational Direction
Short-circuit R223 and R226.
Make the adjustment by turning
the hexagon nut ®) of Figure 9 so
that the marks in pattern © all
appear.
Fix the nuts ©) and © after adjust-
ment.
©
[_____] Angle adjustment
Turn to adjust
Tighten the screws.
(5 ~ 6 kg. cm)
Lens holder
Oscilloscope Range
0.5msec 2V/div
© Adjustment of Waveform Keep
open R223 and R226.
eAfter turning on the power
switch, Let the unit Warm up for
at Least 10 minutes.
eClose the rear cover at fluores-
cent lamp side.
Move the light volume adjustment
plate so that the output waveform
of TP3 becomes flat within the
reference pulse range (at TP1).
Fix the light volume adjustment
plate after adjustment.
, Reference pulse for
| read-out range
|
i
Make adjustment so that the
waveform becomes flat within
the reference pulse range.
Fix the light volume adjustment
plate after adjustment.
Oscilloscope Range
0.5msec 2V/div
i ae Light volume
adjustment plate
@ Gain Adjustment
Keep open R223 and R226
Make the adjustment at the rear
cover of fluorescent lamp side and
in a darkroom.
eAfter turning on the power
switch, Let the unit warm up for
at Least 10 minutes prior to
adjustment.
Adjust R220 on the CCD
PWB to obtain the output
of 6V+05V.
Oscilloscope Range
0.5msec 1V/div
Screw Locking
Apply screw-lock
to the screws.
Apply screw-lock to
the screw, hexagon
nut and lens holder.
Apply screw-lock
to the screw.
Apply screw-lock
to the lens fixing
Apply screw-lock to Screw
the screw,hexagon
nut and PWB.
Apply screw-lock
to the screws.
Apply screw-lock
to the screw.
11

B-500/A/BIG
4. SIMPLIFIED ADJUSTMENT PROCEDURES FOR CCD PWB WITHOUT USING AN
OSCILLOSCOPE
Caution
The procedures described below, simplified adjustment
methods may be used when the electronic white board
is, for instance, moved from one place to another and
requires readjustment. When conducting this adjust-
ment, be sure not to move the lens and the light volume
adjustment plate, readjustment of the Lens require the
use of an oscilloscope.
Never touch the red marked screws, since an oscillo-
scope is also required for their adjustment.
1. Adjustment of the Read-Out Range
Preparation
(1) Remove the rear cover and install the printer.
(2) Remove the front frame and turn on the power
switch. After the initial setting, select the 4th Frame.
(3) Draw horizontal lines with the marker at two posi-
tions, 35 mm from the upper and the lower ends of
the writing white sheet as shown in Figure 7.
(4) Loosen the screws @ and @’ shown in Figure 9.
—
\
Main body
Stretch the chart of
Figure 13 like this way.
Read-out
position
Roll white sheet
Aluminum sash
Board position of first
Page white sheet
Figure 11
Brightened area due to
reflection of fluorescent lamp.
Adjust the reference line of
Figure 13 chart to this position.
Adjustment point
of Figure 13 chart.
12
Adjustment
(1) Make a copy of the 4th Frame and check that the
horizontal lines on the writing sheet are copied.
(2) When the lines are not copied, turn the hexagon nut
below the screw @) using the adjustment Tool while
making a copy of the 4th Frame.
This hexagon nut has endless turn construction,
which brings the nut Back to its initial position
when it is turned 360°. In making the adjustment,
therefore, turn this nut in one direction until the
point is found where both of the horizontal lines are
copied.
(3) Tighten the screws @ and @’. Make copy of the 4th
Frame again and check that the upper and the lower
horizontal lines are printed. Then apply screw-lock
to those screws to finish the adjustment.
2. Adjustment of the Read-Out Position
Preparation
(1) Remove the rear cover and install the printer.
(2) Attach the adjustment chart in such way that the
marks A-A shown in Figure 13 will come precisely
to the edges of the frame as shown in Figure 13-1.
(3) Attach the “BOARD” of the chart at the other side of
A-A marks to the inside of the aluminum sash while
avoiding slackness.
(4) Turn on the power switch and make initial setting.
Aluminum sash
White sh eet
Figuret 3 chart
Figure 12

VB-500/A/B
Aluminum
Sash
Figure 13-1
Upper Side
Adjustment Point
OsL
Reference Line
chart and stick it to the
Adjust this mark to the edge
ae of the frame. Stretch the
aluminum sash of the board.
Lower Side
To be pasted. Not to paste this area. To be pasted
Figure 13 Chart for Positional Adjustment
13

B-500/A/BG
Adjustment
(1)
(2)
(4)
Make
a
copy
of
one
frame
and
check
its
printing
condition.
When the resultant print is like the one shown in
Figure 14, turn the screw © shown in Figure 9
slowly counterclockwise while making copy of one
frame. Stop the screw when the print becomes like
the one shown in Figure 15. At this point, the
adjustment is finished.
When the print is like the one shown in Figure 16,
turn the screw (©) clockwise to adjust to the condi-
tion shown in Figure 15.
Apply screw-lock to the screw © to finish the
adjustment.
3. Adjustment of Print Distortion
Preparation
(1)
(2)
(3)
(4)
Remove the rear cover and install the printer.
Turn on the power switch and make initial setting.
Draw a perpendicular line with a black marker along
with an arbitray vertical line at the centre of the
writing white sheet.
Loosen the screws © and ( shown in Figure 9.
Adjustment
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Make a copy of the frame with the vertical line.
Check the condition of the copied line.
When the vertical line is printed like the way as
shown in Figure 17, turn the hexagon nut ® in
Figure 9 counterclockwise using the adjustment
Tool until the line becomes like the one shown in
Figure 18. When the line is printed like Figure 20,
turn the hexagon nut clockwise until the line be-
comes like Figure 18 or 19.
(In some cases, the vertical line like Figure 19 is
printed as a result of the read-out timing. This
poses no problem for the adjustment.)
Make copy of the vertical line several times and
repeat this adjustment until the slope of the printed
- vertical line becomes linear.
After completion of adjustment, fix the screws ©
and (by. Then make a copy of the vertical line again
and check that the adjustment is completely done.
Check the reading-out and if anything wrong is
found, make readjustment according to the proce-
dure of “2 Adjustment of Read-Out Position” on
page 13.
Apply screw-lock to the screws (©) and (®’ to finish
the adjustment.
14
Figure 14
pe Ns 2]
Se
aero
Figure 16
Vertical li
Figure 17
Turn the screw ©
counterclockwise.
Eee Ee
Gee
Figure 15
Turn the screw © clockwise.
ne
©
Hexagon nut @)
Figure 18
Depending on the timing of read-out, the vertical fine
may be printed as shown in the left. This causes no
problem for adjustment.
Figure 19
Oo=
Hexagon nut @)
Figure 20

VB-500/A/Bi
6.
REPLACEMENT
OF
WRITING
SHEET
1) Disassembly
*Turn off the power switch and lock the casters before
Performing the Replacement.
(1) Remove the two screws at the right and left sides of
the front frame.
Pull out the right or left bottom corner of the front
frame and detach the bottom of the front frame.
Hold the top and the bottom of the frame and lift it
up at an angle to Detach the hooks and Remove to
dismount the front frame from the main body
frame. (Figure 21)
(2
—
Figure 23
(6) Detach the sheet from the writing sheet holder.
(Figure 24)
(2) Remove the nine screws at the bottom of the board.
(Figure 22)
Figure 24
(7)
Plug
in
the
power
supply
cord
and
turn
on
the
power
switch.
(8) Confirm, by the E6 status indicator, that the white
sheet is stationary. Push the Frame Shift button | >
and left the white sheet completely Wind up on the
right side.
(A noise will be heard if the button is kept pushed
after the white sheet_is all wound up. Push the
Frame Shift button [STOP] to stop the white sheet
before the noise is produced.)
Turn off the power switch.
Note: If the noise is not stopped, the white sheet
may be dislocated from the white sheet rail.
When the noise is heard, push the [STOP] button
or turn off the power switch promptly.
Figure 22.
(3) Remove the nine screws at the top of the board.
(4) Pull out the bottom of a board unit. (Figure 23)
Besure that Lower Supports Lock into Position.
(5) Hold the top and the bottom of the board at the
board centre. While lifting the board a little, pull out
the top, keeping the main body and the frame in
parallel.
15
Sim NS A I re tt Be Pi ed SA ne

B-500/A/BIG
(9) Push the brake solenoid under the right side of the
sheet board to release the brake.
Pull out the white sheet by hand slowly. (Figure 25)
\
\ Figure 26
(10) Push the sheet bobbin holder lever in the upper part
of the right side Board, and remove the upper part
of the white sheet bobbin. (Figure 26)
/'I f:
(11) Lift up the white sheet bobbin and draw it out from
the lower white sheet holder.
(12) While rolling up the white sheet TIGHTLY on the
bobbin which was drawn out, carry the bobbin from
the right side of the board to the left side. (Figure
27)
Figure 27
(13) On the left side, follow the same procedures as
described in (10) and (11) to draw out the bobbin.
(14) After taking out the bobbin, retain it with a rubber
band. (Figure 28)
Figure 28
2) Reassembly
(1) Wind up the white sheet TIGHTLY on the right side
roll.
(2) For replacement of the white sheet, take out the roll
hub unit from the removed white sheet, and insert it
to the new white sheet bobbin.
Figure 29

(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
While Holding the white sheet, insert the bobbin
into the bobbin holder in the bottom left of the
board, match the notch of the bobbin, to the Notch
DF
Press the upper part of the white sheet bobbin into
the notch of the upper white sheet holder to
complete the installation of the left side white sheet
bobbin.
While paying attention not to loosen the Rolled up
end of the white sheet, feed out the white sheet
slowly and carry it to the right side of the board.
Note:
When moving to the right side, press the upper and
the lower ends of the bobbin lightly with your
fingers to contact them to the board face for parallel
movement.
Insert the white sheet bobbin into the bobbin
holder, matching the lower side notch of the sheet
bobbin to the bobbin holder.
Press the upper part of the white sheet bobbin into
the notch of the upper white sheet holder to
complete the installation of the right side white
sheet bobbin.
Piug in the power supply cord and turn on the
power switch for an E6 indication.
Push the Frame Shift button[<] to wind up the
white sheet towards the Left for about 5 seconds.
Then turn off the power switch.
Insert the white sheet between the white sheet
holder and the board at both upper and lower ends.
Turn on the power switch again and check that the
initial setting is correctly made.
Note: (The unit is in normal condition if the indica-
tor displays FRAME 1 and COPIES 0.)
Hold the top and the bottom of the board at the
board center, and while lifting the board a little,
hook it on the main frame with the upper part
fixture.
Press upon the stay at the bottom inside of the
board lightly with your hand and Reform it. Press
the bottom of the board against the main frame.
Figure 30
17
VB-500/A/Bi
Lever
= ¢
3
Figure 31
| PUSH
Figure 32
(13)
Fix
the
top
and
the
bottom
of
the
board
to
the
main
frame
with
the
18
screws
respectively.
(14).
Hook
the-fixture
to-the
upper.part
of
the
front
frame
on
the
main
frame.
At
this
time,
check
that
the
board
is
hooked
securely.
(15)
Match
the
roller
catch
angle
holder
at
the
bottom
of
the
front
frame
to
the
roller
catch
B.

B-500/A/BE
7. REPLACEMENT OF ROTATIONAL MECHANISM UNIT
Caution:
The rotational mechanism unit has been adjusted be-
fore shipment to provide its best operational accuracy,
and when its replacement is needed, due care must be
taken not to impair its accuracy by observing the
procedures shown below.
Disassembly of Rotational Mechanism Unit
(1)
(2)
(3)
Unscrew the paper tray, paper guide, printer and
rear cover in this order, and remove the rear cover.
Remove the writing sheet according to the instruc-
tion in “Replacement of Writing Sheet” and store it.
e@ Disconnect the connectors PA and RO at the
photointerrupter PWB, and remove the leads
from the lead holder.
Return the writing sheet board to its specified
position, and temporarily fix two screws at the
centre of the board, one each at the upper and
(4)
(5)
(6)
lower parts.
Disconnect the relay connector which is used to
connect the plunger leads coming from the rota-
tional mechanism units (right and left) to the main
PWB, and then the connectors RE and FF which are
used to connect the motor leads to the main PWB.
And remove the leads from the lead holders and
leave them near the right and/or rotational mechan-
ism unit.
Remove eight screws, two each at the places @), ©,
© and @, shown in Fig. 33.
Remove the screws which have temporarily fixed
the writing sheet board, and detach the writing
sheet board from the main body. At the time, be
careful not to allow the leads of the rotational
mechanism unit to be entwined between the main
body and writing sheet board.
Connector PA
Connector RO
Figure 33 Rotational Mechanism Unit with Rear Cover Removed
Figure 34 Rear View of Rotational Mechanism Unit (at Right Side)
18

(7) Remove the screws @, @, ©, @, © and © shown
in Fig. 34 from the rotational mechanism unit (at
right side), and detach the rotational mechanism
unit from the writing sheet board. The same proce-
dures apply to removal of the left rotational
mechanism unit.
Reassembly of Rotational Mechanism Unit
(1) Referring to the assembly drawing of the rotational
mechanism unit shown in Fig. 34, align the screw
holes of the rotational mechanism unit with those
of the writing sheet board. Then temporarily fix the
screw (); this screw is used as a datum screw to
decide the accuracy of the rotational mechanism
unit.
(2) Also referring to Fig. 34, temporarily fix the screw
@ which is used to decide the accuracy in the
vertical direction and secure the screw @) complete-
ly. Then secure the screw @) firmly and fix the
screws @), @, © and © in this order.
(3) The same procedures apply to reassembly of the
left rotational mechanism unit.
(4) Attach the writing sheet board, with the rotational
mechanism unit secured on it, to the main body and
19
(5)
(6)*
(7)
(8)
VB-500/A/Bi
temporarily fix the two screws at the center of the
board, one each at the upper and lower parts. (At
the time, be careful not to allow the leads of the
rotational mechanism unit to be entwined between
the rotational mechanism board and main body.)
Referring to Fig. 33 secure the screws at the places
@, ©, © and @.
@ Connect the connectors PA and RO at the photo-
interrupter PWB and arrange the leads using the
lead holder.
Connect the plunger lead (coming from the rota-
tional mechanism unit) to the relay connector and
the leads (coming from the motor) to the connec-
tors RE and FF at the main PWB. Arrange the leads
using the lead holders.
Remove the two screws which have temporarily
fixed the writing sheet board and attach the writing
sheet to the board according to the instruction in
“Attachment of Writing Sheet”.
Attach the rear cover, printer, paper guide and
paper tray in this order to the main body. Thus,
replacement of the rotational mechanism unit is
completed.
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B-500/A/BIG
8. ARRANGEMENT OF COMPONENTS
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