19 — Receipt Printer
19–4
CX20/CX30/CX34 Service Manual
The paper tractor mechanism consists of a rubber friction roller (print roller), and
a reduction gear train of two–stage spur gears. The print head is spring–loaded
to contact the friction roller, which then grips the paper. The firm contact of the
print head against the friction roller, with the paper trapped between them, also
enables thermal printing.
The print head prints by thermal means and does not require any maintenance.
The print head must not be disassembled or cleaned. The print head itself is
made of precision–manufactured materials and must not be scratched or
scored: avoid any contact with metal objects (such as a screwdriver blade).
19.2
Test and Adjustment
The printer is scanned at power–up and will print a test ticket provided the
keyswitch is in supervisor mode position. The printer cannot be tested when not
installed in a unit.
To adjust the current drawn by the stepper motor, which is controlled by a
potentiometer on the main PCB (refer to Section 11), proceed as follows:
1
Using a DVM, measure operating voltage across connections of
two–pin connector SK1 on main PCB when printer is operating.
Voltage should be 2V (Axiom receipt printer). If necessary, adjust
voltage by adjusting RV3 on main PCB.
19.3
Servicing
Caution
The print head is made of precision–manufactured
materials and must not be scratched or scored. Avoid
any contact with metal objects (such as a screwdriver
blade).
IMPORTANT:
While the print head is under warranty
do not dismantle print
head as this will invalidate the warranty.
19.3.1
Removing the printer (CX20/CX30)
To remove the printer complete with unit spine, proceed as follows:
1
Switch off machine and isolate it from the mains power supply.
2
Remove case (refer to Section 3).
3
Release main PCB as necessary to gain access for following
operations (refer to Section 11).
Содержание CX20 SERIES
Страница 133: ...11 Main PCB 11 4 CX20 CX30 CX34 Service Manual Figure 11 1 Main PCB Electrical Connections See Tables 11 1 and 11 2 ...
Страница 137: ...11 Main PCB 11 8 CX20 CX30 CX34 Service Manual Figure 11 2 Main PCB DIL Switches and Potentiometers ...
Страница 246: ...25 Appendices 25 9 CX20 CX30 CX34 Service Manual 1 Voids printed on receipt 2 Voids not printed on receipt ...
Страница 258: ...PL 1 CX20 CX30 CX34 Service Manual Section PL Parts List ...
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Страница 317: ...Addendum A Phase 1 4 and CX34 Parts List A 30 CX20 CX30 CX34 Addendum A ...
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Страница 323: ...Contents B 2 Addendum B ...
Страница 343: ...Addendum B Phase 1 5 1 5 3 and New Main PCB B 22 Addendum B ...
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Страница 351: ...PL Parts List Devlin Keyboard C 6 Addendum C ...
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