Adjusting The Sensitivity - UBI EasyCoder 501 Technical Manual

UBI EasyCoder 501 – Technical Manual
LABEL-TAKEN SENSOR, cont'd.

Adjusting the Sensitivity

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/. The intensity of the light emitted from
the LTS can be adjusted by means of a
strap on P-607 on the CPU Board:
No strap = weaker
Strap = stronger
The sensitivity of the label-taken sensor can be adjusted by
means of a potentiometer situated on the CPU board, as de-
scribed in the chapter "Electronics; Potentiometers" later in this
1
manual .
CAUTION!
Since the adjustment must be performed with the power on, take
utmost care to avoid any risk of electrical shock or short-
circuits. Only use a non-conductive screwdriver and keep the
fingers away from the CPU board and the area behind it, where
the mains inlet and mains switch are situated.
You can adjust the potentiometer randomly and check if it is
working properly by trying to print a label without removing the
previous one. Also check that you can print a label when there
is no label left under the LTS. Use the trial-and-error method
until the LTS works properly.
Another way is to make a simple UBI Fingerprint program that
checks the printer's status using the
UBI Fingerprint manuals). Here is an example on how such a
program can be made:
10 BREAK 1,88
20 BREAK 1 ON
30 ON BREAK 1 GOSUB 1000
40 FORMFEED
50 IF (PRSTAT AND 2) THEN BEEP
60 GOTO 50
70 END
1000BREAK 1 OFF
1010GOTO 70
RUN
You can break this program by transmitting the character X
(ASCII 88 decimal) on the standard interface "uart1:".
• Leave the label, ticket etc. in the outfeed slot.
• The sensor is properly adjusted when the printer beeps
continuously. Turn the potentiometer screw a quarter of a
turn in each direction. The beeping should not stop.
• Remove the label and the beeping should cease at once.
• If necessary, adjust the potentiometer until the label-taken
sensor works as described above.
• When adjusting the potentiometer, always create a safety-
margin by turning the adjustment screw a quarter of a turn
further after the beeper has started or ceased to sound.
Close the cover.
function (also see
PRSTAT
Continued!
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