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Old 12-22-2017, 09:18 AM
Yashoda Rohana Yashoda Rohana is offline
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Join Date: Feb 2016
Posts: 8
Unhappy Otari MX-70 Audio board wiring problem

Hi. I bought an Otari MX-70 from a studio that upgraded their equipment to digital. This is a 16 channel, high speed machine. The studio has stopped using it from 3 years ago and it was put in storage. At one time someone has decided to take it apart and sell it off for parts, so they had taken apart the top panel wheels guides, heads, control panel & cut some audio board wires. Luckily I got my hands on the machine before they destroyed it. I got all the parts in a box sitting. Nothing is missing from that except for one counter sensor wheel which they misplaced during parting it. After I bought it I checked audio board wires which have been cut. They have a similar color for the same connector so Iím bit confused to find the soldering order of them and which wire leads to where. Connector numbers CN80, CN81, CN84.
If anyone have this particular machine, please let me know the wire connections so that I can resolder them and power up the machine and see for any other issues.

Thank you.
Old 01-01-2018, 02:26 AM
Yashoda Rohana Yashoda Rohana is offline
Serious Tapehead
Join Date: Feb 2016
Posts: 8
Finally checked the pattern and with a little help wired out the jacks. Powered up the machine and it ran nicely everything worked perfectly. Then after few days I powered it up and it showed error 3 on the counter display. I found out that error 3 means that is something wrong with IC19 according to the manual. But I donít know where to start checking. I checked the ic number itís a cmos programmable (M5M82C55AP-5) I checked main voltage rails they are all fine. Any idea on where to begin checking or if anyone has experience on this type of machine please let me know.

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