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Title: can a tech offer their help? Post by: rev mex on April 04, 2018, 11:23:27 AM I'm getting to the nuts and bolts of my problem. I have a request.
Testing around has brought me to IC 4023 which is in 13E. I'm visually noticing that there is a ripped off trace that once connected pin 3 and 12. Holding up a light under the board confirms that. The schematic (Service manual 1.0) says that pin 2 and 12 should be connected. Which one is correct? If you so happen to have a drumulator board open, can you let me know which one beeps continuity when touching both IC pin points? -Rev Title: Re: can a tech offer their help? Post by: Dynamikk on April 06, 2018, 02:37:01 AM Hi Rev,
I'll have a check when I get home tonight! /Dynamikk Title: Re: can a tech offer their help? Post by: Dynamikk on April 06, 2018, 11:34:18 AM Pin 2 and 12 are connected on my PCB (just like the manual).
Where do you see the ripped trace? Under the 4023 (13E)? /Dynamikk Title: Re: can a tech offer their help? Post by: rev mex on April 07, 2018, 09:15:33 AM Pin 2 and 12 are connected on my PCB (just like the manual). Where do you see the ripped trace? Under the 4023 (13E)? /Dynamikk Yes I unsoldered the 4023 ic and noticed the connection was gone between 2 and 13. I wish I could post a pic. The reason I ask is because I see evidence from the board print that there a connection from pin 2 to 13. I?m going to go back to the schematic if you?ve confirmed that it should be 2 and 12. Appreciate it. -Rev Title: Re: can a tech offer their help? Post by: rev mex on April 07, 2018, 08:49:51 PM (http://revmexmusic.com/wp-content/uploads/2018/04/D2A8E39E-1BC0-4CB1-B2B1-15B43C279158-e1523159764740.jpeg)
Well I learned how to upload an image. As you can see 2 is not connected to 12. 3 was connected. I?m totally confused. It sucks soldering and unsoldering. -Rev Pin 2 and 12 are connected on my PCB (just like the manual). Where do you see the ripped trace? Under the 4023 (13E)? /Dynamikk Yes I unsoldered the 4023 ic and noticed the connection was gone between 2 and 13. I wish I could post a pic. The reason I ask is because I see evidence from the board print that there a connection from pin 2 to 13. I?m going to go back to the schematic if you?ve confirmed that it should be 2 and 12. Appreciate it. -Rev Title: Re: can a tech offer their help? Post by: Dynamikk on April 08, 2018, 04:37:49 AM Hmm...strange.
What kind of issue do you have with your drumulator? Still the freeze when trying to record a pattern? What PCB revision do you have? Serial number? My Drumulator works fine except when I press the Copy/End button...then the Drumulator freezes. I've just received some spare parts so I guess I'll try to get it up and running pretty soon...I hope :-) /Dynamikk Title: Re: can a tech offer their help? Post by: rev mex on April 08, 2018, 03:05:36 PM the board says - 11/30/1982
serial: 1710 at this point i cant turn it on. I'm trying to get it back on. I made things worse when i removed this IC. I'm wondering if there are other service manual version out there besides 1.0 -Rev Hmm...strange. What kind of issue do you have with your drumulator? Still the freeze when trying to record a pattern? What PCB revision do you have? Serial number? My Drumulator works fine except when I press the Copy/End button...then the Drumulator freezes. I've just received some spare parts so I guess I'll try to get it up and running pretty soon...I hope :-) /Dynamikk Title: Re: can a tech offer their help? Post by: Dynamikk on April 09, 2018, 12:54:41 PM Hi Rev,
I just checked my PCB again and it actually beeps continuity between 2-3-12 If you look under the PCB pin 2-3 are connected with a trace, and I guess that 3-12 are connected under the 4023 on the other side of the PCB. So if you don't have a connection between 2-12 I guess the trace on that side of the PCB has been damaged. My PCB is also marked 11/30/82 /Dynamikk Title: Re: can a tech offer their help? Post by: rev mex on April 09, 2018, 01:32:20 PM Hi Rev, I just checked my PCB again and it actually beeps continuity between 2-3-12 If you look under the PCB pin 2-3 are connected with a trace, and I guess that 3-12 are connected under the 4023 on the other side of the PCB. So if you don't have a connection between 2-12 I guess the trace on that side of the PCB has been damaged. My PCB is also marked 11/30/82 /Dynamikk awesome. that'll work! Can I bother you for one more pin check? Same 4023 chip (13E) pin 9 and/to pin 20 on 13K I don't get a beep but I think I should. It may be another dead trace from one point to the next. I really appreciate all the info you've given. -Rev Title: Re: can a tech offer their help? Post by: Dynamikk on April 09, 2018, 03:48:19 PM Yes, they should definitely be connected, also 13E pin 10 to 15K pin 20.
I'm glad I can help :) |