Author Topic: Help with reissue Deluxe Memory Man  (Read 5272 times)

LaceSensor

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Re: Help with reissue Deluxe Memory Man
« Reply #15 on: September 03, 2014, 09:18:58 AM »

For future reference, when trying to calibrate the EC2002-rev E EHX Deluxe Memory Man
There are typically 4 BBD positions (left to right, U4, U5, U6, U7)
These are MN3008, or rarely, MN3005 (position U4 and U7)

Trimmers relating to the BBD voltage bias are thus:

Trim 1 = U4
Trim 2 = U5
Trim 3 = Gain
Trim 4 = U6
Trim 5 = U7
Trim 6 = Balance
Trim 7 = Gain

For the MN3005 setup, there are 3 JP (jumpers) points on the solder side of the PCB that omit U5 and U6 positions.
For the MN3008 setup, clearly you have 2 more trimmers. These are labelled SP, and noted on the board to populate those in the case of MN3008 setup. The PCB also says populate (jump) the JP markings in the case of MN3005 usage.

Its unlikely I will convert mine to MN3005s, but I might put two of them in U4 and U7 spots for shits and giggles.

For what its worth, I biased mine to 8v on each Trim, set the gains as appropriate for my taste with the Feedback knob set to self oscillate, and left the balance trim in the middle.

LaceSensor

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Re: Help with reissue Deluxe Memory Man
« Reply #16 on: September 03, 2014, 09:42:02 AM »
hmmm

boxed it up and now it doesnt work properly again
delay only in 1st 5% of the pot rotation, then nothing.
changed ics again, still the same
so wierd

LaceSensor

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Re: Help with reissue Deluxe Memory Man
« Reply #17 on: September 03, 2014, 09:52:29 AM »
ok so here is what I have found out.

When the potentiometer for delay is connected to the case, it casuses the delay time to mess up / stop working above 5%

the pot has a wire soldered to the body of it, connecting to the PCB ? assume to GND.

When I disconnect this wire with the PCB outside of the case, everything works fine. Connect that wire, and things go bad again.

Seems like some kind of wierd grounding issue...


LaceSensor

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Re: Help with reissue Deluxe Memory Man
« Reply #18 on: September 03, 2014, 10:21:53 AM »
hmmm. switched the pot out again and it works now, little wire connecting to the board and everything. whew!

Scruffie

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Re: Help with reissue Deluxe Memory Man
« Reply #19 on: September 03, 2014, 10:23:45 AM »
you the man
yours is a pint, if ever we should meet
or more than one, haha
Haha, well if you're ever down south, Becks please ;)

ok so here is what I have found out.

When the potentiometer for delay is connected to the case, it casuses the delay time to mess up / stop working above 5%

the pot has a wire soldered to the body of it, connecting to the PCB ? assume to GND.

When I disconnect this wire with the PCB outside of the case, everything works fine. Connect that wire, and things go bad again.

Seems like some kind of wierd grounding issue...



The pot should only connect to pins 2 & 3 of the 4047...

Maybe they're using the pots body as a ground lug, in which case connect that wire to a jacks ground instead... and also make sure the wire is actually soldered to ground and has a good solid solder joint and tests for continuity.

Edit: Late again! Wonder what was going on there then... oh well if it works it works :)
Works at Lectric-FX

LaceSensor

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Re: Help with reissue Deluxe Memory Man
« Reply #20 on: September 03, 2014, 10:55:21 AM »
you the man
yours is a pint, if ever we should meet
or more than one, haha
Haha, well if you're ever down south, Becks please ;)

ok so here is what I have found out.

When the potentiometer for delay is connected to the case, it casuses the delay time to mess up / stop working above 5%

the pot has a wire soldered to the body of it, connecting to the PCB ? assume to GND.

When I disconnect this wire with the PCB outside of the case, everything works fine. Connect that wire, and things go bad again.

Seems like some kind of wierd grounding issue...



The pot should only connect to pins 2 & 3 of the 4047...

Maybe they're using the pots body as a ground lug, in which case connect that wire to a jacks ground instead... and also make sure the wire is actually soldered to ground and has a good solid solder joint and tests for continuity.

Edit: Late again! Wonder what was going on there then... oh well if it works it works :)

I can only think that the original pot is in some what damaged , either previous or a combination of me desoldering and resoldering it numerous time to test it and also meaning I was (over) heating the pot body.

Anyway, seems stable now with a new B100k, and in fact there is a lot less clock noise despite the pots measuring the same value.

Definitely something wierd going on there.

So, for less than 100 inc postage, plus a 4047, sa571 and B100k, I have a big box which current market value seems to be approximately double the price paid :D