SHARP ER-A460 CASH REGISTER NO DISPLAY - ANOTHER SUCCESSFUL FAILURE

A customer dropped off a Sharp ER-A460 cash register for a totally dead siturtion. After some initial tests I found several high ESR capacitors and after replacing them I got the display running once again, but unfortuatly I think the firmeare has been corrupted. I can not enter any data such as setting he date, time, or pricing information. Another successful failure!
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Thank you to these people that have supported my channel by making a donation or by having me repair your unit.

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Dena Hamilton Paul Agbuya
Samuel & Nancy Guich
Dot Morgan Timothy Ritchel
William Holloman Cynthia Adams
Andrew Oros George Savage
Graham Foral Paul Agbuya
Scott Kullen (Thank you for monthly support)
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Scott DuVall Christian Brenzel
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Howard Goble Diana Williams
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David Ammerlaan John Johnson
Shaheed Amirkhan Brett Sherry
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John Eggers Linda Kuo
Daniel Pyles Melanie Branton
Lisa Sklar Barry Marchant
John Harper Larry Mcdonald
Annette Lewis Howard Goble
Hugo Tajimaroa M R Rajesh
Dan Latorre Uri Cohen
00:00 Intro
00:35 The internal view
01:15 Just a bad fuse?
01:30 Some voltage measurements
02:29 STR2024 data sheet and voltage measurements
03:02 Switching regulator diagram
03:31 ESR capacitors
04:15 Cleaning Vacuum display and lens
04:43 We have a display now
05:17 The failure of the unit
07:00 Final thoughts

Видео SHARP ER-A460 CASH REGISTER NO DISPLAY - ANOTHER SUCCESSFUL FAILURE канала NorCal715