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TR 909 general fail
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dancelwerk



Joined: Aug 28, 2009
Posts: 93
Location: berlin
Audio files: 2

PostPosted: Sun Feb 14, 2016 12:22 pm    Post subject: TR 909 general fail Reply with quote  Mark this post and the followings unread

Hello to all,

since last week, I have strange behavior in my 909, sometimes when I turn the switch on, all lights are off and in the display i have 000, three zeros, other times the display is off too.

I opened the machine and checked the power supply, all voltages are good, 220 before the transformer, and 5V, 15V and -15V, I have the correct voltages in the mainboard too.

Two years ago I changed the version to version 4, could be the new chip with the new operative system, i had read that have to be Mitsubishi, that others are not good, i have to check what brand is my chip.

What can I check?

Thanks in advance.

Dancelwerk
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dancelwerk



Joined: Aug 28, 2009
Posts: 93
Location: berlin
Audio files: 2

PostPosted: Sun Feb 21, 2016 10:26 am    Post subject: Reply with quote  Mark this post and the followings unread

ok guys all is working again, I changed C704, C701 and reweld the eprom version 4, one pin was not good.

Thanks to all.
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