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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jun 22, 2012 4:46 am Post subject: Mac will be impressed... |
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I am knee deep into repairing one of these:
http://www.flickriver.com/photos/13416756@N02/3049103317/
The takeup reel slows down and stops about 5 seconds after you press play. FF and REW are solid. I think I know what part has died. I'll post more once the job is done, it's part of a very cool musical restoration project...
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jun 22, 2012 6:50 am Post subject: |
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Really cool!
And its ANALOG!!! 
I once helped in constructing a sound recording studio (I did all electrical/electronical stuff). They had one similar machine and a digital system called ADAT from Alesis which recorded 8 tracks on a VHS video tape. They did have three of it in order to get 24 tracks, If they needed more they would use the analog system in parallel.
I could imagine that the problem was/is related to the sensors which tell the drive logic if the reels are spinning. In those times they were made of simple light barrier or reflection sensors which would be prone to dust and/or aging. Nowadays those are hall effect sensors which mostly are immune to these effects.
Regards,
barclay66
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 1:50 pm Post subject: Re: Mac will be impressed... |
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| Curt Palme wrote: | I am knee deep into repairing one of these:
http://www.flickriver.com/photos/13416756@N02/3049103317/
The takeup reel slows down and stops about 5 seconds after you press play. FF and REW are solid. I think I know what part has died. I'll post more once the job is done, it's part of a very cool musical restoration project... |
I anxiously await your conclusion..... 
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jun 22, 2012 2:11 pm Post subject: |
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I might scan the schematic and send it to you. I'm pretty sure I have it nailed down to a few key components, but they are using a couple of 741s as current amplifiers. No voltage present at the input or outputs.
No question that the drive signal going to the motor driver is dying in play mode. Solid and high output in FF mode. IN play mode it comes up to 5 volts, and then drops slowly. About 1 in 10 times, the reel motor won't spin at all. So I'm suspecting one of the 741s that's not outputting properly, or the driver to the 741s is a weird chip that I've never seen before, it consists of 4 FETs in a DIP package. One FET used per function, and their outputs are summed. If the play MOSFET is screwed, it can do it as well.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 2:39 pm Post subject: |
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Sure, send me the prints.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri Jun 22, 2012 3:10 pm Post subject: Re: Mac will be impressed... |
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| Curt Palme wrote: | I am knee deep into repairing one of these:
http://www.flickriver.com/photos/13416756@N02/3049103317/
The takeup reel slows down and stops about 5 seconds after you press play. FF and REW are solid. I think I know what part has died. I'll post more once the job is done, it's part of a very cool musical restoration project... |
That's a beautiful piece of hardware.
craigr
_________________
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Photo Research PR-650 Spectroradiometer
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Murideo Fresco SIX-A HDMI 2.x Analyzer
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Sencore CR7000 CRT Tube Analyzer / Rejuvenater
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Jun 22, 2012 3:39 pm Post subject: Re: Mac will be impressed... |
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| CIR Engineering wrote: | | Curt Palme wrote: | I am knee deep into repairing one of these:
http://www.flickriver.com/photos/13416756@N02/3049103317/
The takeup reel slows down and stops about 5 seconds after you press play. FF and REW are solid. I think I know what part has died. I'll post more once the job is done, it's part of a very cool musical restoration project... |
That's a beautiful piece of hardware.
craigr |
I wouldn't even know where to start, let alone be willing to operate on it  Curt you have me impressed!!  Definitely more complex than a CRT IMO, at least as far as repairs go
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When I'm asking for a Model number, that doesn't mean I'm asking for a nude photo with your number on it
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 7:46 pm Post subject: |
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Hey Curt. Maybe we should start a thread of the odd stuff we repair. One of my lastest repairs.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri Jun 22, 2012 7:58 pm Post subject: |
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What was wrong withe THE HDQ Mac?
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 8:03 pm Post subject: |
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| CIR Engineering wrote: | What was wrong withe THE HDQ Mac?
craigr |
No red analog output. Digital output was fine. Needed a new chip.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 8:17 pm Post subject: |
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And today's project.....
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sat Jun 23, 2012 4:04 am Post subject: |
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| macgyver655 wrote: | And today's project.....
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I need one of those!
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Tech support for nothing
CRT.
HD done right!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Jun 23, 2012 4:55 am Post subject: |
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What, a broken amp? How many you want? 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jun 23, 2012 1:37 pm Post subject: |
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| Curt Palme wrote: | | What, a broken amp? How many you want? |
LOL..... I'm sure you have piles... It's not the amp factor that puts it in the odd category, it's the brand....
You and I usually know what each other is working on anyways.
Edit: Just realized you may have been responding to Analogs post...
Last edited by macgyver655 on Sat Jun 23, 2012 1:44 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jun 23, 2012 1:41 pm Post subject: |
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| AnalogRocks wrote: |
I need one of those! |
I'll tell you, the build quality is not that bad.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sat Jun 23, 2012 4:51 pm Post subject: |
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| Curt Palme wrote: | | What, a broken amp? How many you want? |
Broken I have. I need a working one and a base shaker
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Tech support for nothing
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HD done right!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 24, 2012 8:55 pm Post subject: |
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Poor Pioneer, all in pieces...... 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jul 25, 2012 3:25 pm Post subject: |
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| macgyver655 wrote: | Poor Pioneer, all in pieces......
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Why mac, that appears to be the Best Buy Special you have there, I only know that from the sticker on the front panel  I had a whole pallet of their junk, only 16 of 81 pieces of equipment didnt work, sold them for $12 in one lot!!!
Looks like you got one of the nicer things best buy discarded (even if it is plastic pioneer stuff )
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When I'm asking for a Model number, that doesn't mean I'm asking for a nude photo with your number on it
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jul 25, 2012 4:00 pm Post subject: |
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Is that where it's from? Most of the sticker has been torn off. It's breathing some life now, had more then 1 problem, still can't decide if it was a return that didn't work from the factory or a failure later. Has odd ball symptoms and odd blown parts.
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