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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.

VCR won't record or playback color



 
 
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  #1  
Old July 6th 06, 05:40 AM posted to sci.electronics.repair
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Posts: 10
Default VCR won't record or playback color

A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks

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  #2  
Old July 6th 06, 02:15 PM posted to sci.electronics.repair
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Posts: 24
Default VCR won't record or playback color


"VCR Gymnast" wrote in message
oups.com...
A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks


My guess would be the 600kHz3.58MHz conversion circuits. Do u have a
schemo for this unit and what kind of test signals are u capable of
injecting?


  #3  
Old July 7th 06, 04:41 AM posted to sci.electronics.repair
b
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Posts: 764
Default VCR won't record or playback color


VCR Gymnast ha escrito:

A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks


Today I fixed a sony vhs with this symptom. e-e pic ok, tapes no
colour, as you describe. had to resolder a bit in the y/c section and
replaced several 1uF caps and the 4.43 xtal for good measure.
-B.

  #4  
Old July 7th 06, 04:54 AM posted to sci.electronics.repair
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Posts: 704
Default VCR won't record or playback color

"VCR Gymnast" wrote in news:1152157251.328327.300970
@a14g2000cwb.googlegroups.com:

A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks


Have you tried cleaning the heads? We had one that went to black and
white and cleaning the heads made it come back to color part way.

Puckdropper
--
Wise is the man who attempts to answer his question before asking it.

To email me directly, send a message to puckdropper (at) fastmail.fm
  #5  
Old July 7th 06, 01:03 PM posted to sci.electronics.repair
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Posts: 280
Default VCR won't record or playback color

VCR Gymnast wrote:
A portable Beta VCR from 1985 works perfectly except there is no
color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good
VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC
that contains an internal B&W/color switch?

Thanks


Make sure there isn't a color / bw switch somewhere, like on the back panel.
Seen it on U-Matics, anyway...

Mark Z.


  #6  
Old July 8th 06, 05:34 PM posted to sci.electronics.repair
external usenet poster
 
Posts: 10
Default VCR won't record or playback color


Puckdropper wrote:
"VCR Gymnast" wrote in news:1152157251.328327.300970
@a14g2000cwb.googlegroups.com:

A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks


Have you tried cleaning the heads? We had one that went to black and
white and cleaning the heads made it come back to color part way.


I cleaned the heads both manually and with a Scotch cassette cleaner,
but no improvement. Video remains B&W.


Puckdropper
--
Wise is the man who attempts to answer his question before asking it.

To email me directly, send a message to puckdropper (at) fastmail.fm


  #7  
Old July 8th 06, 05:37 PM posted to sci.electronics.repair
external usenet poster
 
Posts: 10
Default VCR won't record or playback color


Mark D. Zacharias wrote:
VCR Gymnast wrote:
A portable Beta VCR from 1985 works perfectly except there is no
color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good
VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC
that contains an internal B&W/color switch?

Thanks


Make sure there isn't a color / bw switch somewhere, like on the back panel.
Seen it on U-Matics, anyway...


There is no external BW/Color switch. This switch is present inside an
IC somewhere in the chroma circuit, which is a separate module in this
very small modular VCR. Even though this VCR is a Beta from 1985, it is
the smallest VCR ever made.


Mark Z.


 




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