rowe ami black magic with display malfunction / carousel keeps spinning

Jack-J

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Aug 22, 2012, 5:16:23 PM8/22/12

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Hello everyone,

I am the proud owner of a rowe ami r-82 black magic (for about 4-5 months).

Via kleening I managed to 'repair' some small defaults. It has been playing perfectly, almost daily. However as of late, it won't stop spinning during start up.

Normaly the carousel would stop at #127 or #177, however it will skip these numbers on the display....and keep on spinning.

The display will show the numbers 280 through 210 and then will skip back to 200. This will happen twice. Then continue with 240 through 250 (twice) and will contue back at 280 and start all over again.

During start up, the scan led on the control unit keeps burning. Indicating that the memory unit and encoder are O.K. (service manual)

So is this a display 'problem' or a memory unit (301-07855) / encoder (601-07667) 'problem' as suggested by the troubleshooting charts of the service manual.

I have checked the wires and plugs and everything looks O.K. and no battery leakage on the memory unit board.

When manualy turning the cam and triggering the switches, the jukebox will play perfectly. But keeps on spinning as soon as the record is put back.

Any suggstions on how to get this great machine back in to action?

Kind regards,

Jack from the Netherlands
--
View on Narkive:
http://narkive.com/be5gDQpo

Alan Hood

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Aug 24, 2012, 6:42:33 AM8/24/12

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Hello Jack,

I suggest that you send me the following boards out of your 1978 Rowe
Ami R-82 Black Magic:-

Memory Unit 301-07855
Mechanism Control Unit 401-06905
Selector Logic 601-08060

I test/repair these as a set of boards.

If you require any further information please contact me, I deal with
repairers and end users world wide.

Regards
Alan

Alan Hood (ami-man)
Games Unlimited & Datex Systems
Units 4 & 5 Lion Park
New Street
Halfway
Sheffield
S20 3GH

(44) 114 247 0242 phone
(44) 114 251 0727 fax
alan...@datex.co.uk

--
Alan Hood

kreed

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Aug 26, 2012, 6:57:34 AM8/26/12

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The problem is caused by the lack of pull-up resistors on the memory unit for the encoder wheel connections. You solder a 10k resistor from the connector from EACH wiper of the encoder wheel (except the common) to the -17v rail. This fixes this problem in my experience. Please use anti-static precautions when doing this mod as the IC's used on these boards are extremely static sensitive compared to modern IC's.

Jack-J

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Aug 29, 2012, 2:37:57 PM8/29/12

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Thank you,

Alan Hood and Kreed for your replies.

As I am not technical by nature, I will try to get the memory unit repaired here in the Netherlands.

If not succesfull, I will contact you (Alan) to see if you can help me fix this problem.

Kind regards,

Jack

jta.vand...@hccnet.nl

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Nov 23, 2012, 5:39:30 PM11/23/12

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Op woensdag 29 augustus 2012 20:42:51 UTC+2 schreef Jack-J het volgende:

jta.vand...@hccnet.nl

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Nov 23, 2012, 5:42:45 PM11/23/12

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Hello Jack,
Is your memory unit already repaired?
Did/Do you know what the problem is, because I have a simular problem.
If so, can you please post it here?
Thanks,
Harold

P.S.
I also live in The Netherlands.

Jack-J

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Dec 9, 2012, 4:28:44 PM12/9/12

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Hallo Harrold,

My problem has not been solved (i've contacted alan to help me)

I do now know for sure that the problem lies within the memory unit.

I have bought several r-82 computer-units, including a memory unit.

Although my problem was solved, this 'new' unit had other problems insted.

I will keep you (and other viewers) posted on the results.

Should any of you be looking for parts/units for a r82? Please let me know.

I bought a box full of several untested units for the r-82.

Kind regards