Incorrect Imaging On The 7-Segment Display; Printer Malfunctions; The Printer Motor Advances The Paper Ribbon, But The Printing Is Incomplete Or Blank - ELCOM Euro-50 Service Manual

Service manual

4.2.2. Incorrect imaging on the 7-segment display

Table 4.3. Procedure for solving incorrect imaging of a 7-segment display - customer display
ID Test
Check the connection of the dis-
1
play and the motherboard
Check the supply voltage of
2 VDDQ-XC3, GND-XC3, signals DIS-
PDATA-2, DISPCLK-2
Replace the display with a functi-
3
onal one
Launch test for the customer dis-
4
play (101)
With a malfunction of the printer, be sure to first check, according to the table „General activities during printer malfunctions" whether
there is a defect in the printer or the motherboard.
Table 4.4. General activities during printer malfunctions
ID Test
Check for damage and the connection of the FPC cable to
1
the printer head and cables to the sensors.
Switch on cash register without a power adapter connec-
2
ted.
Launch the test of cash register supply voltage (900) and
3
check the voltage of VH and VDDQSW
Upon shutting off of the cash register, measure whether a
4 short has occurred between the signals leading to connector
XC7
Replace the printer with a functional one and start the prin-
5
ter test (200)
6 Defective printer
4.3.1. The printer motor advances the paper ribbon,
but the printing is incomplete or blank
Proceed according to the table „General activities for printer malfunctions". If the problem continues, continue accor-
ding to the following table.
Table 4.5. Procedure for incomplete or blank printing, print motor advances paper ribbon
ID Test
1 Check progress of signals PSTB, PCLK, PDATA, PLATCHn.
Elcom s. r. o.
Steps in the case of an unsuccessful test
Repair damaged or loose cable. If the FPC cable is damaged, the display must be chan-
ged.
Check L1, L2, L3, L4, R11, joints with XC3. (E50MB.pdf, list disp-fm.schdoc) Also check given
signals on the dps display interconnect. (E50D-IC.pdf, list e50-disp-ic.schdoc)
Check whether no short has occurred between signals DISPDATA-2, DISPCLK-2. Check
progress of signals DISPDATA-2, DISPCLK-2, to connector XC2 (MB) and to the dps display
interconnect (XC2) with an oscilloscope

4.3. Printer malfunctions

Steps in the case of an unsuccessful test
If the FPC cable is damaged, the printer must be replaced. If a
cable from a sensor is damaged and can be repaired, do so and
continue with activities 2 - 5
After switching on, the cash register attempts to print out in-
troductory information. If this involves periodic initialization
of the cash register, it's probably a faulty accumulator. Replace
the accumulator with one that is fully charged.
Check the circuits of switches VH and VDD. Check whether no
short has occurred between VH, VDD and GND. (E50MB.pdf, list
print-control.schdoc)
Check circuits of the printer interface. (E50MB.pdf, list print-
-control.schdoc)
Defective circuits in printer interface. Proceed according to the
type of defect according to subsections:
Print motor shifts paper ribbon but printing is incomple-
te or blank.
Printer prints everything onto one microline –printer
motor stops (compressed printing)
Steps in the case of an unsuccessful test
Replace the printer (E50MB.pdf, list print-control.schdoc)
Euro-50
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