Lower case "d" in display on AL1456

[Tactiveboy]

Offered to look at one of our customers old machines a Sharp AL1456 it has a lower case d in the display and won't do anything. I have looked through all our sharp literature and can't find any reference to this code has anyone got any pointers.

[ZOOTECH]

Try Test Command 5-1 (usually will test panel) , are all the segments and LEDs lighting up? It may not be "d" at all if segments are missing.

[Tactiveboy]

The panel won't respond so can't get in to service mode. I have told the customer its not worth the effort, but i would like to fix it, proffesional pride and all that!

[ZOOTECH]

Power on with one of the doors open and see if you can get into diags that way.

[Tactiveboy]

Tried this, no change just the lower case d, I am seeing this d when i close my eyes to sleep its haunting me.

[vlad_]

similar situation was on the AR-5316. Treatment - the replacement main board copier.

[Tactiveboy]

Thanks for the suggestions, I have already said a replacemnet copier is the best fix and the customer is happy with this, as am I.

[OMD-227]

A small, lower case 'd' on the display means the machine is in Firmware Update Mode.

The 'd' simply means 'download'.

Any of the small AL & AR models of that engine design all have this feature. Have a look at the Service Manual for them and see the 'Contents of Simulations' section. Standard firmware upgrade procedure sim 49-01, shows how it works.
The same engine design model like the ARM155, has a bigger display, so it actually says the word 'download', not just the 'd'.

All the info I know from the past, is that you cannot turn the machine OFF while in the 'd' download mode until the display says 'off' on the small LED display.
It would say 'off' once the firmware upgrade procedure, using the firmware upgrade software tool has been completed.

If the machine has been turned off before the Firmware upgrade procedure has been completed, there is either damage to a Flash ROM, or the machine is still in 'download' mode on each bootup.

If you really want to try fixing this, perform the firmware upgrade, using the firmware upgrade software & downloading tool.

[vlad_]

In my case (AR-5316) firmware update did not give any result. d - is constantly burning. The old main pwb changed under warranty at SHARP. After testing, I was told that it was defective chip IC10. Flash ROM LH28F800BJE
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