vcr repair emerson ev868

[nucleus]

does anyone here have a schematic of a typical optical reader circuit
on a vcr?

problem is: emerson ev868 vcr powers up and responds to all buttons,
will load and eject tape but will not respond to remote control. vcr
does
send rf to tv.

remote does send IR, as determined with digital camera.

is it necessary to have an oscope to troubleshoot this problem?

optical eye on circuit board has been cleaned.

 

[b]

On May 28, 12:49 am, nucleus <rose122...@yahoo.com> wrote:

does anyone here have a schematic of a typical optical reader circuit
on a vcr?

problem is: emerson ev868 vcr powers up and responds to all buttons,
will load and eject tape but will not respond to remote control. vcr
does
send rf to tv.

remote does send IR, as determined with digital camera.

is it necessary to have an oscope to troubleshoot this problem?

optical eye on circuit board has been cleaned.

There might have been a drift in the frequency of the resonator in the
handset - just because you get IR does not prove it's innocence!
.. Also could be a duff cap or bad IR diode in the vcr. get a cheap
universal remote control and try that on the vcr.
-B

 

[N_Cook]

nucleus <rose122550@yahoo.com> wrote in message
news:3710dd2c-9558-4bd4-9c55-d414cc3c120c@q32g2000yqn.googlegroups.com...

does anyone here have a schematic of a typical optical reader circuit
on a vcr?

problem is: emerson ev868 vcr powers up and responds to all buttons,
will load and eject tape but will not respond to remote control. vcr
does
send rf to tv.

remote does send IR, as determined with digital camera.

is it necessary to have an oscope to troubleshoot this problem?

optical eye on circuit board has been cleaned.

Check f of ceramic resonator agrees with its marking in r/c, or replace it.
If it has been dropped and cracked, r/c can still operate but outside
capture range of Rx

 

[Franc Zabkar]

On Fri, 27 May 2011 15:49:34 -0700 (PDT), nucleus
<rose122550@yahoo.com> put finger to keyboard and composed:

does anyone here have a schematic of a typical optical reader circuit
on a vcr?

The typical IR sensor is a 3-pin device, often in a metal can. The
pins are usually +5V, ground, and output.

- Franc Zabkar
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