Search found 153 matches

by cutoffres
Fri Aug 02, 2019 4:55 pm
Forum: General Synthesizers
Topic: Analog synths. Need your advice !
Replies: 3
Views: 1297

Re: Analog synths. Need your advice !

For a vintage synth, i would say a Sequential circuits six trak . 49note . arpeggiator. Patch save. Sounds so good. Solid. Not too heavy. great Synth lead and bass. drone can be programmed easily. actually very cheap for what it offer. I have got many bigger vintage synthesizer, but the sixtrak has ...
by cutoffres
Mon Jul 31, 2017 5:13 pm
Forum: Gear Services & Other Goods
Topic: Parts for VINTAGE SYNTHESIZERS.....
Replies: 53
Views: 68673

Re: Parts for VINTAGE SYNTHESIZERS.....

Since a few years i've buy two synths (trident and juno 106) and some replacement parts from them: http://www.vintagesynthshop.com I was surprised not to see them on this list.
Just get an ensoniq vfx sd mainboard from them and i'm very happy they found this part for me.
by cutoffres
Mon Jul 31, 2017 5:01 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

I have spend hours triying to find the fault on this VFX SD. I have abandoned :? I've contacted http://www.vintagesynthshop.com (buy a few parts from them the last years) and i'v been lucky, because they have accepted to swap my faulty mainboard with a new old stock one they had. So it cost to me 60...
by cutoffres
Wed Jul 19, 2017 2:25 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

As GILIRose as addressed a new fault without opening a new tread, it became very hard and confusing for me to read this tread. I finally abandoned to repair my VFX sd. I'm going to buy a working one and if i have time i will try swap board to found where was the fault, and will let know here. Thanks...
by cutoffres
Fri Apr 28, 2017 4:23 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

Replaced Q21 (79l05) (Q12 on vfx schematics) without success. Tried to isolate some part of the -12V line without success, still have -9,18V on the -12V line. Now there is even no light on the Disk Drive... I'm a bit lost, i won't give up but maybe will try to troubleshoot with a second VFX sd if i'...
by cutoffres
Thu Mar 16, 2017 12:38 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

Inspecting C32 and C31 was my next investigation place, so i must be in the right direction? measures on the 79l05 are: Common= 00 Input= -9,05V (the wrong -12 ANALOG voltage) Output=-4,46V This 79L05 has got solder flux on the pins, so maybe will replae it at the same time the C32 capacitor on the ...
by cutoffres
Wed Mar 15, 2017 5:41 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

So back to this Ensoniq VFX SD, I summarize where we were: This VFX SD was faulty: No boot , even nothing on the screen at power up... Power supply and mainboard where faulty. Power supply has now been serviced and give perfectly the needed voltages. On the mainboard there was a problem with the VRE...
by cutoffres
Fri Feb 10, 2017 7:00 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

I've replaced C21 the fault delay cap without success. I've scoped the LM2926 OUTPUT VOLTAGE and DELAYED RESET OUTPUT when power ON: Mainboard plugged to the Power supply board: OUTPUT VOLTAGE PIN 2 goes +5V DELAYED RESET OUTPUT goes +0,3V with a 450ms delay Mainboard unplugged from the power supply...
by cutoffres
Wed Feb 08, 2017 6:07 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

Ok, i think i understand: The VRES must be connected to a cpu to "exist", so when i unplug the mainboard from power supply board what i measure is not the VRES line but the LM2926 output voltage. Do i understand right?
by cutoffres
Wed Feb 08, 2017 4:24 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

You're indicating a paussible fault of "LM2926 and associate capacitor" that are located on the power supply. But all the voltage are good when the Mainboard is unpluged from the power supply board A) For me that mean that i should invinstigate on the mainboard and not on the power supply? Could you...
by cutoffres
Tue Feb 07, 2017 6:27 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

Ok, replaced burned fuses :? :oops: Checked the Power supply 10 times, then replaced the -12 regulator (7912) that was dead. Now when the Power supply is unloaded all the voltage are correct apart from +VU that is 12,43V (allowable range is 8 to 11V on the service manual) and DISPLAY OFFSET that is ...
by cutoffres
Wed Jan 25, 2017 7:21 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

I have Triple checked the Power supply: It has a WRONG VRES and a WRONG -12V ANALOG when the mainboard is connected to the power supply (0.32V for VRES and -0.62V for -12ANALOG) When check the Power supply unloaded (not connected to any other board) it has a RIGHT VRES (4.90V) and a bizarre and out ...
by cutoffres
Tue Jan 03, 2017 4:48 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Re: Ensoniq VFX SD mainboard troubleshooting

Hi, i'm the subject opener. I didn't except a so fast and complete response! Sorry for the slow reaction. I'm now in front of the VFX SD, i've just replaced the CPU without succes on the fault. I'm going to read all the details rasputin send and try to repair this vfx sd. I would like to let know th...
by cutoffres
Wed Nov 02, 2016 6:49 pm
Forum: HELP!
Topic: Ensoniq VFX SD mainboard troubleshooting
Replies: 100
Views: 20447

Ensoniq VFX SD mainboard troubleshooting

Have got a VFX SD who do not works. the Display is always in "SELF TEST MODE". I've got the service manual but no shematics, so following their troubleshooting guide i end on: "Replace the Main board, send it to Ensoniq". I'm not able to perform any of the software RESET or HARD RESET. I've never be...
by cutoffres
Thu Apr 09, 2015 5:32 pm
Forum: HELP!
Topic: Roland Sh-2000 installing grounded power cable
Replies: 0
Views: 348

Roland Sh-2000 installing grounded power cable

Hi, here in Europe (220Volts) the power plugs are 3 points, so 3 wires: the negative; the positive; the Ground; On the old Roland sh-2000 i have in my hands, it is only a two points power cord (negative, positive) connected into the synthesizer fuse board on two points... The original cable/Power su...