Question about Retail Supplies

Open Question

Sharp er a420

How can i use bar code scanner with sharp ER-A420 cash register

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 159 Answers

SOURCE: I have sharp er-a420 it was in my garage for two

Most Sharp register, including the ER-A420, have a rechargeable battery mounted inside to hold all memory when the power goes out. It should last a few months, but two years is a bit much. This might get it going:

  1. Unplug from AC POWER.
  2. Turn the key to PGM.
  3. Hold down both paper feed keys (at top-left of keyboard).
  4. While holding those two buttons down, plug the power back in.
  5. Turn the key back to REG.
  6. Enter 1 CASH # to sign on as Cashier 1.
  7. Try a sale.
There is a strong chance this won't do the job, because the memory has been randomized by total loss of power when the battery died. Worse yet, the battery may be too far gone to ever take a solid charge again. If so, you probably need the help of a Sharp register dealer to replace the battery, totally clear all memory and reprogram it. It's probably worth the money; the -420 is an excellent little register.

Posted on Dec 24, 2009

  • 1 Answer

SOURCE: my sharp cash register ER-A550S stop working

The letter H appears in the screen. The register will not respond. Any idea to what the Letter H means?

Posted on Aug 24, 2010

  • 1766 Answers

SOURCE: Where is my PLU/UPC button on the Sharp ER-A420

Do you have the European or American version?

Posted on Nov 30, 2010

  • 117 Answers

SOURCE: Hi I have a cash register

it depends which model of the scanner did you purchase. As there are several models available, see below:
MS3780-9 OCIA and RS232 Transmit/Receive MS3780-11 RS485 and Full RS232 MS3780-38 RS232 Low Speed USB*, Keyboard Emulation Mode or USB Serial Emulation Mode MS3780-40 Full Speed USB MS3780-41 RS232/Light Pen Emulation MS3780-47 Keyboard Wedge, Stand-Alone Keyboard and RS232 Transmit/Receive MS3780-48 Stand Alone Keyboard and RS232 Transmit/Receive MS3780-120 USB and RS232 Transmit/Receive with EAS
As I checked the Sharp cash register, there are 2 RS232 connectors. So you probably have the MS3780-38, MS3780-48 or MS3780-120 model of the scanner.
To connect the scanner with RS232 interface of the cash desk please use the cabel 53-54000-3. You would also need a power supply. Im not sure in which country do you want to use the installation, so please select the right model for region from the list below:
AC to DC Power Transformer - Regulated 5.2VDC @ 1A output. 46-00525 90VAC - 255VAC United States, Canada and Japan 46-00526 90VAC - 255VAC Continental European 46-00527 90VAC - 255VAC United Kingdom 46-00528 90VAC - 255VAC Australia 46-00529 90VAC - 255VAC China 46-00530 90VAC - 255VAC India
I hope it helps.

Posted on Dec 13, 2010

Daniel S
  • 4323 Answers

SOURCE: Sharp cash register er 3310. Can do Programming


This can either be due to a jammed paper roll or a failed transaction. Check the printer to make sure that the paper roll is full and installed correctly, a paper roll can easily jam the printer. Make sure that you are yousing a good quality paper. Refrain from touching the print head or the motor while installing paper. To by reset the "LOCk" condition press the "CL" key, then press "ESC" twice, this will bypass the transaction/error or other user input that has caused the machine to freeze up. Make sure memory is free on your register.
If you want to open the drawer manually then slide the lever located on the machine bottom toward the rear (The drawer will not open, if it is locked with a drawer lock key). Hope this helps... Please post back if you need more information.


Posted on Dec 30, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I change the name of my shop on the receipt?

Here is the manual for the ER-A410 and ER-A420

it is a PDF file so you will need an Adobe PDF reader to open it.

Oct 19, 2014 | Sharp ER-A420 Electronic Cash Register

1 Answer

Sharp ER-A420 Casg Register

Turn your key to P and press cash/total button twice...goood luck

Dec 27, 2013 | Sharp XE-A402 Electronic Cash Register

1 Answer

Cash register Sharp ER-A420 Z report

Ther is a possibility that your machine was operating on training mode. In this mode , no memory is kept

Oct 11, 2012 | Sharp ER-A420 Cash Register

1 Answer

How do I get my hands on a free service manual for Sharp ER-A420

if you can email me at i can send you the pdf file for this.the one i have is for the era410-420.

Feb 09, 2012 | Computers & Internet

3 Answers


Does it open when you print a Z report? The most common problem with these was either the drawer wiring or drawer solenoid failing.
If anyone needs more information, the Sharp ER-A410 and ER-A420 manual is here:

Oct 20, 2011 | Casio Parts Cash Register PC Desktop

Not finding what you are looking for?
Retail Supplies Logo

Related Topics:

27 people viewed this question

Ask a Question

Usually answered in minutes!

Top Retail Supplies Experts


Level 3 Expert

1766 Answers


Level 3 Expert

79847 Answers

Patrick Tinashe...

Level 2 Expert

592 Answers

Are you a Retail Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides