Display Troubleshooting; Keyboard Troubleshooting - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy
• the ECR reports that the printer head is up
incorrect HS signal
damaged head position sensor
• the ECR reports overheated head
incorrect TS signal

6.4 Display troubleshooting

• the displays do not display at all or display all their segments
incorrect connexion between main PCB and Intercon PCB
incorrect connexion between Intercon PCB and the customer display
damaged display module
error on main PCB

6.5 Keyboard troubleshooting

• some key doesn't work at all or very irregularly
damaged silicon keyboard padding
damaged conductive carbon pad
• larger group of keys doesn't react
damaged 16-wire FCC connecting cable
damaged circuits on the keyboard PCB
• the ECR doesn't react to any of pressed keys (the time is displayed correctly)
damaged 16-wire FCC connecting cable
damaged keyboard module
damaged keyboard scanning circuit
• the ECR doesn't react to any of pressed keys (ECR displays erroneous data or nothing at all; static
time)
the malfunction cause doesn't originate in the keyboard
Service manual
– check the connexion
– check the proper position of the head lifting mecha-
nism
– use the multi-meter to measure the HS voltage value
(head up state is approx. 0 V, normal state is approx.
5 V provided VCC1 power supply is functioning
– check the VCC1 power supply voltage
– check, event. replace R53
– replace the printer
– check the connexion
– use the multi-meter to measure the TS signal voltage
(at room temperature its value is approx. 2 V pro-
vided VCC1 is functioning; signal voltage decreases
with raising environment temperature)
– check, event. replace R37
the PR&DISP1 connector on the main PCB and the
connecting cable integrity as well
ging of the customer display connector and check
the connecting cable integrity
– replace the entire module for customer or cashier
display
– check the ECR according to chapters 6.1 and 6.2
– replace the silicon padding
– replace the entire keyboard, best also replace the
silicon padding
– inspect thoroughly, event. replace the connecting
cable
– replace diodes D1 – D8 and U1 circuit, event. replace
the entire keyboard PCB
– inspect thoroughly, event. replace the connecting
cable
– replace the entire module
– replace U20 circuit
– turn to chapter 6.1
© Elcom, s. r. o.
– check the plugging of
– check the plug-
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