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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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This is the same machine that had been running fine after replacing the
belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#2
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clean the video drum and heads again.... and again.
-- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Wayne Tiffany" wrote in message ... This is the same machine that had been running fine after replacing the belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#3
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Thanks - I'll give it another go. What's the chance I had a head fail?
WT "sofie" wrote in message ... clean the video drum and heads again.... and again. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Wayne Tiffany" wrote in message ... This is the same machine that had been running fine after replacing the belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#4
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Try pause. If you have a good picture in pause then its something to do
with the captain servo locking or tracking pulse. |
#5
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Try putting in pause. If you have a good pix then it is a capstan servo
lock or control tracking pulse problem. |
#6
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Try putting unit in pause. if picture is good then you either have
capstand servo lock or control track problems Doug Wayne Tiffany wrote: This is the same machine that had been running fine after replacing the belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#7
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Thanks for the suggestion - I'll try it tonight.
WT "Doug" wrote in message oups.com... Try putting unit in pause. if picture is good then you either have capstand servo lock or control track problems Doug Wayne Tiffany wrote: This is the same machine that had been running fine after replacing the belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#8
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I checked the pause mode last night and I do not get the double image. I
get a snowy patch, but the image is only a single image. WT "Doug" wrote in message oups.com... Try putting unit in pause. if picture is good then you either have capstand servo lock or control track problems Doug Wayne Tiffany wrote: This is the same machine that had been running fine after replacing the belts & mode switch. Now it started recording poorly - what I get is a duplicate offset image. Kind of looks like vertical foldover, except it's actually offset, not upside down. 1. I have tried all 3 speeds - no difference. 2. Playing a tape recorded on another machine seems to be fine. 3. If I go into the fast scan mode, it looks normal, it's just in play mode that I see the problem. 4. Adjusting the tracking will affect the image, but not fix it. 5. I have given it a good cleaning, but it didn't appear to change anything. Any thoughts? WT |
#9
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I don't have a good image of the pix your describing.
Since it plays back recordings from other units or prerecords I would think the heads are ok. Things to check Make sure the tape guides are going into the V stops. back tension on tape. Maybe a record switch voltage is low only effecting record. Other thoughts are the pg and fg pulses from the cylinder motor.But I'm still thinking about why the difference. Maybe its something to do with the head switching pulse as during record the the vcr creates the switch pulse and during playback it reads it off the tape. What things have you checked ? Do you have a schematic? Can you e-mail me a picture? Doug |
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