Author Topic: Roland VGA-7  (Read 12070 times)

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Offline admsustainiac

Re: Roland VGA-7
« Reply #50 on: October 08, 2013, 11:34:09 AM »
Its best to contact your local Roland Repair Center.

They have access to the VGA-7 Service Manual, and I have heard that some Roland Repair Centers do re-sell  Service Manuals to users. 

Offline frankpaush

Re: Roland VGA-7
« Reply #51 on: October 08, 2013, 11:47:10 AM »
@admsustainiac excellent idea, I will try this!

Offline Mo Tanner

Re: Roland VGA-7
« Reply #52 on: February 19, 2014, 03:08:57 PM »
Hi all, been a long time since I was around.

I purchased a new VGA-7 amp chassis without the cab that I'm going to install in a head box.
The bloke who pulled it out of the broken in shipping cab paid no attention and so far I haven't been able
to find a schematic or good pic.

If a VGA-7 user would be kind enough to look in the back of their amp and tell me what colors go to which
speakers it would be greatly appreciated.

Thanks        Mo
« Last Edit: March 31, 2015, 06:09:51 PM by Elantric »

Offline dave_n_s

Re: Roland VGA-7
« Reply #53 on: March 13, 2015, 12:24:25 AM »
I've bought a VGA-7 (actually my second having sold the first and succumbed again when this one was listed locally).

The previous owner had never used a 13 pin pickup, and I'd not got a 13 pin guitar available (with plans to buy a Godin, but not quite coordinated)

From the pinout, I learned 1 to 6 are the strings, so attempted to inject a 500Hz signal of a few hundred millivolts between one of the pins and ground. Nothing happened.

Is there a method for a basic function check of the 13 pin of the amp? The rest, from 1/4 in analog input works fine.

What was I missing?

I know Roland stuff is reliable, but the seller - a reasonable local guy - and I would like to know all is well.



Thanks

« Last Edit: March 31, 2015, 06:10:11 PM by Elantric »

Offline Elantric

Re: Roland VGA-7
« Reply #54 on: March 13, 2015, 02:13:32 AM »
You really need a  GK 13 pin PU to get that amp running

Review the schematics thread
http://www.vguitarforums.com/smf/index.php?topic=73.0
There is only one Ground, the large round barrel on the DIN13 plug

Also no sound will occur without the GK volume Control Voltage (+5VDC) feeding pin #8
« Last Edit: March 13, 2015, 02:25:45 AM by Elantric »

Offline dave_n_s

Re: Roland VGA-7
« Reply #55 on: March 13, 2015, 06:44:31 AM »
Thank you. I was using the shield as return

That's what I had deduced, hoping the control voltage wasn't necessary for basic function, just the logic up / down & volume.


Offline happyjay

Re: Roland VGA-7
« Reply #56 on: March 16, 2015, 07:10:46 PM »
frank:

I realize it's quite some time since your post, but I just stumbled on it. I'd be very interested in knowing if you scored a technical manual with schematics. A well known amp modder and builder is willing to put a stereo FX loop in mine if I can get hold of the schematics.

Offline Muzition

Re: Roland VGA-7
« Reply #57 on: March 25, 2015, 12:06:29 AM »
If you read the owner's manual, you'll realize there's already a stereo effects loop built into the amp.

Offline Muzition

Re: Roland VGA-7
« Reply #58 on: March 25, 2015, 12:11:37 AM »
Why not take it to store like Guitar Center and try out the amp with GK equipped guitar?  It's less painful than reverse engineering a cable.

Offline VGA-7

Re: Roland VGA-7
« Reply #59 on: June 18, 2015, 12:29:07 PM »
Aloha everyone!
Mahalo for all the great info on this forum! A while back I won a VGA-7 head in an auction on
ebay for parts or repair,the winning bid was $20.95, shipping was $50.00.I hoped I would be able to reset or use my original VGA-7 to bulk dump into the head and restore it but I couldn't even get it in mode to accept a load.
I put it away and later noticed this post(  ..sorry for tearing the thread out of its grave ... I recently got a VGA-7 thrown away by its former user. because the whole digital section seems to be out of function. No lights, no reaction. The poweramp section is in function, using the EXT in a signal is coming out of the speakers, adjustable by Master volume. Easy way could be there is missing any power coming from the power amp board to the digital board. Unfortunately I can't find any instruction about the values that must be seen at the multiplug.)
I finally got around to checking and yes it's true the power amp still works ;D !
So now i should be able to use it to power my GP-10,among other things.
I just wanted to remind everyone that even if the preamp section is fried due to trying to update (it seems that was a common problem and there are probably lots of cheap to free heads around) .
Now I need to find out the spk wiring sequence,there are 2 blk (grnd probably)2 red,2 orange,and 2 brwn. Anyone got any Ideas? Thanks in advance and good luck finding deals!


Offline Vjammer

Re: Roland VGA-7
« Reply #60 on: September 29, 2016, 09:22:30 AM »
Can anyone tell me how I can change the internal battery on my VGA 7? I really don't want to pay to have this done if I don't have to.
« Last Edit: September 29, 2016, 09:28:29 AM by Elantric »

Offline Gurbz

Re: Roland VGA-7
« Reply #61 on: February 09, 2018, 12:15:09 AM »
There’s a vga-7 for sale in my neighbourhood. I’m using a vg-88 (guitar modeling, not amp modeling) and a katana head/2x12 marshall cab and I’m happy with that. Am I missing an opportunity here? Is the vga-7 a better sounding amp?

Offline admsustainiac

Re: Roland VGA-7
« Reply #62 on: February 09, 2018, 03:45:43 AM »
There’s a vga-7 for sale in my neighbourhood. I’m using a vg-88 (guitar modeling, not amp modeling) and a katana head/2x12 marshall cab and I’m happy with that. Am I missing an opportunity here? Is the vga-7 a better sounding amp?
https://www.vguitarforums.com/smf/index.php?action=dlattach;topic=262.0;attach=11445
How strong is your back?

Weight 37.6 kG / 83lbs
« Last Edit: February 09, 2018, 03:50:15 AM by admsustainiac »

Offline Gurbz

Re: Roland VGA-7
« Reply #63 on: February 09, 2018, 04:56:26 AM »
 :)
Sound quality is the question

Offline Elantric

Re: Roland VGA-7
« Reply #64 on: February 09, 2018, 05:08:01 AM »
:)
Sound quality is the question

VGA-7 is Stereo 2 x 12" with separate HF tweeters

But its open back cab lacks low end for use with Synth patches

Its GK COSM processing is a step backward from the VG-88 IMHO.

And at 83 pounds the cab is heavy and bulky when  moving, and service manuals are unobtainium  , its pushing 20 years old  - they only made them 2000-2001, and expect electrolytic cap failure  / power supply failure.


start here and download all the VGA-7 docs on the bottom of 1st post
https://www.vguitarforums.com/smf/index.php?topic=262.0
« Last Edit: February 09, 2018, 05:13:12 AM by Elantric »

Offline Gurbz

Re: Roland VGA-7
« Reply #65 on: February 09, 2018, 05:14:44 AM »
Thanks, it is still for sale :)

Offline Smash

Re: Roland VGA-7
« Reply #66 on: February 09, 2018, 08:55:03 AM »