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9.2.21 Left Margin
Adjustment
This adjustment is to ensure that the fall of the
left margin signal is as far as possible from the
print emitter 3 signals.
1.
Turn power off at the operator control
panel.
2.
Remove the printer cover (9.2.1).
3.
4.
5.
Rotate the horizontal fine adjustment knob
m
to the center of its travel.
Push the print head carrier against the left
side frame.
Set up a meter to read +5 V dc.
6.
Monitor the left margin signal by connecting
the meter between A-A2R2U02
(+)
III
and
test point G6 (-)
II .
Note:
If
your machine has a card in location
A A2V2, remove the card, disconnect
the cable from the card, and plug the
cable into the V2 socket.
7.
Turn power on at the operator control
panel.
8.
Slowly move the carrier to the right (by
rotating the motor pulley) until the meter
indicates a shift to an up level. (Use the fine
adjustment knob to get as near to the shift
point as possible).
9.
Mark a point on the knob
1iJ.
10.
Monitor the -print emitter 3 signal by con-
necting the meter between A-A2R2S03
(+)
Band G6 (-)
[i.
11.
Check that the signal is not negative initially,
but shifts negative when the fine adjustment
knob is rotated 1/4 turn or more in each
direction from the mark.
12.
If the signal shifts as indicated above, go to
the next step. If the meter shows negative
initially or does not shift as indicated in the
previous step, move plug P2B
IJ
to another
position (see decal on safety cover) and re-
turn to step 3.
13.
Mark the final position of plug P2B on the
decal.
14.
If you removed the card from A-A2V2
in step 6, replace the card and re-
connect the cable.
To System
Gate A
Test
Points~
Il]A-A2R2U02
(-left margin)
(-)
Power Supply Board
00000000000
00
.-N««
'-NMo:;:tLn'-N~~~~<.OI"CO
>
»»$$.....l.....lu.a...(!)(!)(!)
Back of Printer
Serial Printer
9-31
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