LCD module on printer port

I found LCD module (display) from Epson ECM-A0404. It looks like 20×2 module. Module has 16 pin connector… hmm… looks like standard LCD module.
I connected wires according usual pin-out. But, oops!, some sort of short circuit. At first glance, it looks like, that pin 1 and 2 are swapped. Reconnected wires and nothing… Took another module- it has small left-out of old PCB. It looks 2 and 3 connected to GND. And 1 maybe is Vcc (Power). Rewired again- nothing. Maybe I damaged module, switched module and again nothing.

For testing purposes connected standard LCD module (16×2) … and it works.
Working LCD module
This is Win-Amp plug-in working on Windows XP and WinAmp5.08e. This means, that EPSON module is using some non standard pin-out. Short search in interned didn’t help. Only few people searching for pin-out of this LCD module.

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7 Responses to LCD module on printer port

  1. Max says:

    If you have a pin-out of tjhis module,please,send me via e-mail ( you.

  2. I didn’t found any pinout for these module. I put it into “long” drawer… ­čÖé

  3. priewan says:

    1.)Epson ECM-A0404 from Canon fax

    1 = Vcc
    2 = GND
    3 = ?
    4 = contrast resistor
    5 = ?
    6 = ?
    7 = ?
    8 = ?
    9 = D1
    10 = D0
    11 = D3
    12 = D2
    13 = D5
    14 = D4
    15 = D7
    16 = D6
    Tryed pin combinations but I’m still unable to get it to works…

    2.)Epson ECM-A0421 from Canon fax
    14 pins, pinout compatible, initialization sequence different but all works fine!!!

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  5. djusee says:

    Could someone find the wiring? THX

  6. Yaroslav says:

    I’ve found some facts about circuits around the LCD and thereby about pinout:
    1: Vcc (+5V)
    2: GND
    3: GND
    4: Resistor 620 Ohm to GND
    5: LSI – 44 pin (processor or controller with proprietary designation HH4-1272)
    6: LSI – 45 pin (with capacitor to GND)
    7: Vcc (+5V)
    8: LSI – 46 pin (with capacitor to GND)
    9: LSI – 51 pin
    10: LSI – 43 pin
    11: LSI – 47 pin
    12: LSI – 48 pin
    13 – 16: GND
    So I think, the LCD works in 4-bit mode; pin 5 – something like ‘Enable’; pins 6 and 8 – may be ‘RS’ and ‘R/W’; pins 9 – 12 – D0 – D3. I have not seen any lightback LED on LCD-module, so pin 4 isn’t lightback perhaps. I’ll try to run this LCD soon.

  7. Yaroslav says:

    I’ve got success in displaying some symbols on this display, but it works little weird ­čÖé
    I can’t understand what’s going on yet. I applied arduino with LiquidCrystal library (with LiquidCrystal(rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7) function) for testing.
    The following connections were:
    1: Vcc (+5V)
    2: GND
    3: GND
    4: Resistor 620 Ohm to GND for LCD Contrast.
    5: RS
    6: R/W
    7: Vcc (+5V)
    8: Enable
    9: D7
    10: D6
    11: D5
    12: D4
    13: D3
    14: D2
    15: D1
    16: D0

    There is much more weird things happen in 4-bit mode ­čÖé W/R pin could be connected to GND.

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