EC-PM-80320 Service Manual
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Chapter 6 Troubleshooting
6.1 Error Message on the Control Panel
When the malfunction is occurred, the printer will be off-line and give an alarm through LEDs. You
can make out different malfunctions through the Table 6-1 shown below.
Tab 6-1 Error message on the control panel
6.2 Power Trouble
The electric voltage from power supply connecting to printer is single＋24VDC, which is connected
to the fuse through printer power supply. The voltage becomes 5V through U12 supplying to parts of
main board, and becomes 3.3V through U4 supplying to U1.The power LED in the control panel
displays whether the power is on or off. If the switch is on and power LED is off, please check the
fuse and check whether the second pin voltage of U12 is＋5V.
6.3 Print Badness
When warp appears in the heat printing, make sure the paper is in normal condition. If the print
result is thin at one side, please check if the platen becomes flexible. CN4 takes charge of the
connection of thermal head, Please check whether the FFC is damaged or connected well
6.4 Motor Abnormality
If paper feeds abnormally, check whether there is a 3.3V square wave output in the test point
between the 29th pin of U1 and R2 when pressing the FEED key. If it does, check the 44th, the 47th,
the 48th and the 49th pin of U3 in the same way (the corresponding test point in the C36 around).If it
does not, U3 may be damaged. With U3 having no problems, go further examination for U8, which
is the drive chip of paper feed motor. The output pins of U8 are the 16th, the 17th, the 26th and the
27th. Check whether there is a normal square wave output in the output pins which are specified for
the 2nd, the 7th, the 8th and the 13th. Please check whether the drive chip of motor is damaged or
not if there is no output. Check whether CN2 connector is connected well, the one which takes
charge of paper feed motor and paper sensor.
6.5 Cutter Abnormality
Please check whether the upper cover is closed when the cutter can not work. Also check whether
CN5 connector is connected well, the one which takes charge of cutter.
6.6 Cash Drawer Interface Abnormality
Please check whether U9 is damaged if cash drawer can not work. Check whether the
corresponding pins of U9 are Anti- mutually, the one which is chip of 74HC04. Also check Q1 and
D5.
6.7 Cutter Jammed or Error
When the auto-cutter is jammed by paper, please open the upper cover of the printer and take out
the jammed paper. If the upper cover can not be opened, as well as the auto-cutter still can not
Error LED PAPER OUT LED Malfunction Solution
BLINK FAST OFF Auto cutter error Reposit the auto cutter
ON OFF Upper cover is open Close the cover tightly
OFF BLINK Paper is about to end Load the paper again
ON ON Paper out Load the paper again
BLINK OFF Print head overheated
Recover automatically after cooling
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