[OldVTRS] VR-1200 update

Tue Jan 30 16:55:33 CST 2018

Shai

Don't swap the board at this time.  The compatibility may be an issue.

The following needs verification by an AMPEX person.

Here are some hints about board compatibility.  
Boards have an assembly number on them.  It then ends in a -xx number with possibly a letter following these two digits.

I was told that if the board has the same assembly number before the dash it is okay to swap.  The dash xx is the version of the artwork.  The letter following will be a revision to parts on the same artwork.

If the assembly number is different, then the board is not plug compatible.  There is a wiring change to the plug or harness.  

THIS MEANS SMOKE MAY COME OUT OF THE MACHINE!

Everyone is saying the same thing.  Get the machine working in basic modes before these wild crazy ideas of swapping assemblies or boards.  You will only dig the grave for the machine by doing the swaps.  There are way too many subtle difference between machines that you will not know unless you have very good documentation and all service notes from AMPEX including FEBs and parts changes.  I do not know them.  I have a short list and that is it.  The documentation that I have is for the near the end of the B versions.  I do have a short list of FEBs in a training manual but that does not cover everything.  There were special kits that were available to fix problems in editing.  I had to put these in.  But they were not listed on the FEBs so it is be careful.

Chris

-----Original Message-----
From: Shai Drori <shayke888 at gmail.com>
To: OldVTRS <OldVTRS at groups.io>
Sent: Tue, Jan 30, 2018 4:52 pm
Subject: Re: [OldVTRS] VR-1200 update

Disregard last post. After posting gmail notified me of new replies and after reading them I think the best course of action would be to swap board 12 and see what happens, and if all is well add auto chroma later. The B machine is not a machine anymore. I had to move 18 months ago and had to disassemble the B machine. I didn't know that the other machine en route is an A, thought it was another B. So I have an A machine and lots of spares from a B machine. 
I'm not so good at trouble shooting electronics myself. I have the equipment and some know how but not enough to know what to look for. I now know it's heat induced so can look further with all your help. Tip projection is always done manually here unless there are special circumstances. 

As for the shoe being to close or too far, I was under the impression that the shoe can only be in the right spot if I have no curvature of the picture. I check for that with both monitoring the demod out where I can see the actual error and by looking at the Amtec error that shows a flat line instead for a hill or dale, when the shoe is in the right place. Am I wrong?

בברכה,
שי דרורי. 0544-470-420
מומחה לשימור ודיגיטציה של אודיו וידאו ופילם 8-35ממ
Cheers
Shai Drori

Expert digitization services for Audio Video
3K scanning for film 8mm-35mm

Timeless Recordings Music Label
www.audiovideofilm.com

shayke888 at gmail.com

Tripadvisor level 5 contributor, level 10 restaurant expert

On Tue, Jan 30, 2018 at 11:41 PM, Shai Drori <shayke888 at gmail.com> wrote:

Hi guys
If by guide you mean tip projection it's always in manual mode. Tomorrow I'll switch the sigsys chassi and see what happens. The other one has auto chroma as well, but I'll leave it out for now. 

בברכה,
שי דרורי. 0544-470-420
מומחה לשימור ודיגיטציה של אודיו וידאו ופילם 8-35ממ
Cheers
Shai Drori

Expert digitization services for Audio Video
3K scanning for film 8mm-35mm

Timeless Recordings Music Label
www.audiovideofilm.com

shayke888 at gmail.com

Tripadvisor level 5 contributor, level 10 restaurant expert

On Tue, Jan 30, 2018 at 6:28 PM, Don <groups at digitrakcom.com> wrote:

Hi Shai

Yes, the guide servo amp is as you describe, but that’s likely not the problem.  Please see the replies from myself and from Chris.  We both suggest that you look at Board 12 in the signal system.  That is what is controlling the guide servo.  If it works when cold, then I’d suspect a transistor failure.  Once it has heated up and failed, you can easily go thru it with a scope and find the problem.  

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com

From: Shai Drori 
Sent: Tuesday, January 30, 2018 8:25 AM
To: OldVTRS at groups.io 
Subject: Re: [OldVTRS] VR-1200 update

Latest update. Today I decided to just turn Big Berta on and see what happens. Hit play and got V and H lock in about one second. Nice steady picture (Amtec going crazy but I'll set up that when I'm done with the basics). After about 9 minutes when things warmed up the relay started going again. This is the servo amplifier that is on the left side back of the machine. 

בברכה,
שי דרורי. 0544-470-420
מומחה לשימור ודיגיטציה של אודיו וידאו ופילם 8-35ממ
Cheers
Shai Drori

Expert digitization services for Audio Video
3K scanning for film 8mm-35mm

Timeless Recordings Music Label
www.audiovideofilm.com

shayke888 at gmail.com

Tripadvisor level 5 contributor, level 10 restaurant expert

On Tue, Jan 30, 2018 at 4:06 AM, Don <groups at digitrakcom.com> wrote:

Shai

The control for the guide servo, both activation and error signal, comes   from Module 12 (Sync Proc) in the signal system.  I assume that the relay   you are referring to is K2 on the guide servo chassis.  With the front   panel guide mode switch set to Auto, the illumination level of the Auto switch   cap should change between bright and dim as the K2 relay is changing.    You should verify the proper setup of  the Signal System (NOT Servo)   module 12 and repair if needed.  There is no warning light for the lock   status of Bd 12 other than the proper functioning of the guide servo Auto   mode.

Don   Norwood
Digitrak Communications, Inc.
www.digitrakcom.com

From: Shai Drori 

Sent: Monday, January 29, 2018 5:50 PM

To: OldVTRS at groups.io 

Subject: [OldVTRS] VR-1200 update

I was asked   privately how the vr-1200 project was progressing and it wasn't. I was busy.   Today, after my client asked when will he get more material I decided I can't   put this off anymore and started to setup Big Bertha (yes I gave her a name to   go with her annoying personality). The whole day was spent with no apparent   results. Setup was going according to the list and all checked out but no   picture. Finally, with the online help from Larry Odham, I figured out that   capstan osc was way way way off. 

So now I have   horizontal lock, but the relay in the Honeywell solid state servo amplifier   keep kicking at a rate of about 3 kicks every two seconds. No warning lights   on panel though. Any ideas?

בברכה,

שי דרורי. 0544-470-420

מומחה לשימור ודיגיטציה של אודיו וידאו ופילם 8-35ממ

Cheers
Shai Drori

Expert digitization services for Audio   Video
3K scanning for film 8mm-35mm

Timeless Recordings Music Label
www.audiovideofilm.com

shayke888 at gmail.com

Tripadvisor level 5 contributor, level 10 restaurant   expert

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