Newsgroup: sci.electronics.repair

Jerry, many thanks for taking the trouble to reply.  You are the 
newsgroup's wise man!

You are right, the machine is difficult to service.  I placed a gear 
assembly at the wrong tooth position, and it took me four hours to 
understand how to assemble it in the right position (there was no 
apparent timing mark, and it fell off by mistake).  The gear in question 
had teeth around 3/4 of its periphery.  Apparently the trick is to 
engage the gear in a "toothless" position and then rotate the gear that 
drives it.  At some point the driving gear "catches" the partially 
toothless gear and engages it at exactly the correct position.

Back to the original subject.  I may be getting closer to the problem's 
cause: I decoded the error message on the display as: "05 Abnormal 
reverse cam motor rotation", and I noticed that a large gear-driven 
plastic plate is in a different position (by one tooth) when the problem 
manifests itsself, than when the tape is originally put into the VCR.  I 
assume that the plate should be in the same position when the tape is 
first inserted, and after stop is pressed.  I will experiment engaging 
this plate at different gear teeth, assuming it was somehow missaligned 
(e.g. by someone forcing the tape into the VCR).


Cheers,

Diomidis

Jerry G. wrote:
> A warn idler assembly and or a bearing or bushing that is failing or jamming
> can cause this type of effect. This is the only thing I can think of from
> guessing at a probably cause. The best thing would be to have someone who
> has a lot of VCR service experience to look at it for you. There machines
> can be a challenge to service.

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