jd
New Member
Posts: 32
|
Post by jd on Oct 3, 2019 1:50:16 GMT
Anyone have any technical data on the 7 segment LEDs for the R81 display module 401-06904? I have some burned out segments and not sure where to find a modern replacement that runs on negative voltage. The broken calculator look has got to go. Guess I could try finding a more standard 5V unit and try (+) to -1V and (-) to -7V. There are more scrap display units around for later R82+ models. Do they use the same LED digits?
I am new to jukeboxes but have fixed other electronics in the past as a hobby. Haven't confirmed the voltages in the R81 wiring diagram match the actual machine, but these logic level voltages seem pretty arbitrary from a modern standpoint.
|
|
|
|
Post by Ron Rich on Oct 3, 2019 2:40:53 GMT
Jd, is there any info printed on the LED itself ? Ron Rich
|
|
jd
New Member
Posts: 32
|
Post by jd on Oct 3, 2019 3:33:44 GMT
Will be a couple days before I can tear into it. Putting my armchair expert opinion badge on, it looks like based on scaling grainy photos and google searches that I may be dealing with a 0.3 inch common cathode red display of around 2v and 25 mA since that seems to be a run of the mill item. However, schematic shows 1.6k of resistors. If i calculate [(-1--7)-2]/(25/1000) it gives me 160 ohms for the current limiting resistor which is several times less than what is on the diagram. Dont want to pop $500 in electrical boards due to the wrong $5 worth of leds.
|
|
|
|
Post by amiman66 on Oct 3, 2019 9:28:58 GMT
Hello JD,
I have new (old stock) display chips that I normally sell as a set of three, I sell these on Ebay or directly.
Regards
Alan
ami-man
UK
|
|
jd
New Member
Posts: 32
|
Post by jd on Oct 3, 2019 15:14:36 GMT
What do you sell a three set for and do you ship to the US? I am in VA.
|
|
|
|
Post by amiman66 on Oct 8, 2019 12:58:40 GMT
Hello JD,
I sell the three display chips for £10.00 plus delivery costs.
Regards
Alan
ami-man
UK
|
|
|
|
Post by Ron Rich on Oct 8, 2019 13:10:48 GMT
JD,
That's about $12.25 USD--
Ron Rich
|
|
jd
New Member
Posts: 32
|
Post by jd on Oct 8, 2019 16:09:12 GMT
Sold let me know where you want to facilitate the transaction.
|
|
|
|
Post by amiman66 on Oct 10, 2019 8:59:40 GMT
Hello jd,
Please send me a pm with your address details, paypal login name, I will then send you a paypal invoice.
Regards
Alan
ami-man
UK
|
|
