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7.
PAPER MARK DETECTOR
The paper mark detector is used
to
sense the black mark which is on the paper.
It
tells the unit where to
start printing and when to stop. If the unit is giving an error message of "CHECK PAPER" or "REFILL
PAPER" the adjustment procedure should be carried out.
7.1
Adjustment
1. With your soldering iron and the two pieces of wire, attach one wire
to
point
' A
and the other to point
'B' on the interconnect board as shown on Figure
7.
NOTE:
It is easier to.solder your wires on the circuit side
of the board.
2.
Connect your oscilloscope or meter to the end of each wire ('A'
=
'+' and
'B
=
I-').
Run the wires to the
outside of the unit and put the cover on, attaching all cables but the LCD again for ease of adjusting.
3. Turn the unit on. Press 3 (1 00mmls) and 4 (11 0). This puts the unit into
1
Omm/s speed. Press M
to
put
the unit into manual recording mode. With your tweaker in one hand, pick up the top cover and reach
inside the unit. Insert the tweaker into TR1 (refer to Figure
1).
4.
Press the START key. Observe the scope or meter and adjust TRl such that the following voltage
levels are measured:
No paper mark:
0.4
-
0.6V
Paper mark:
3.5
-
4.0V
NOTE:
If there is a problem in getting the voltage to adjust down to 0.5V, you will need to check the
physical placement of the paper sensor. The mount may be loose or the mount may have
been bent in some way.
If
the mount is not loose, then bend the sensor mount slightly
upwards. If you watch your scope or meter while doing this, and observe the voltage level,
you can tell when it is in the right position.
When the adjustment is correct and paper runs with no error message, press the STOP key and turn the
unit off. Remove the top case and the wires that were soldered to points ' A and 'B'. Reassemble the unit
and give a final check.
7.
EINSTELLEN DES PAPIERMARKENDETEKTORS
Am
R2
und GND Voltmeter oder Oscilloscope anschliessen. Papiervorschub auf 1 Omm/s und manueller
Betrieb einstellen. Motor starten. Eingestellt wird TR1 so dass folgende Spannungspegel gemessen
werden kbnnen:
keine Marke:
0,4
-
0,6V
Marke:
3,5
-
4,OV
8-1
1
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