Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

vcr repair emerson ev868

6 views
Skip to first unread message

nucleus

unread,
May 27, 2011, 6:49:34 PM5/27/11
to
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

unread,
May 27, 2011, 7:46:34 PM5/27/11
to

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

unread,
May 28, 2011, 3:52:37 AM5/28/11
to
nucleus <rose1...@yahoo.com> wrote in message
news:3710dd2c-9558-4bd4...@q32g2000yqn.googlegroups.com...


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

unread,
May 28, 2011, 5:24:27 PM5/28/11
to
On Fri, 27 May 2011 15:49:34 -0700 (PDT), nucleus
<rose1...@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
--
Please remove one 'i' from my address when replying by email.

0 new messages