Toshiba DVR670 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 01-16-2013, 03:46 AM - Thread Starter
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I have 4 Toshiba DVR670. The third one I bought less than a year ago stopped playing tapes and ejected them and shut itself off. I tried rebooting. Did not help. I tried recording and it actually worked for about 4 minutes then ejected and turned itself off. Now it won't record either. When i called Toshiba they immediately told me that I should return the unit to them. it was a problem with the optical eye. Unfortunately the only shipper near me is USPS and they want $60 to ship it back to Toshiba. Since Toshiba does not have any DVR670 in stock and will not be getting any more I don't want a coupon for $303 to buy anything on Toshiba for 30 days. That's the only option they have given me. So i won't spend my $60.
Does anyone have a fix for the optical eye?
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post #2 of 4 Old 01-29-2013, 08:55 PM
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'Optical Eye' (?Lazer pickup?) is used ONLY for the DVR.

What's really at fault is the VCR's reel pulse is weak or missing.
Caused by:
1) Dirty prism ( Remove one screw, with dampened q-tip, dust off infrared emitter LED - Reel sensor - and especially the prism or light waveguide. Or,
2) Infrared LED itself is weak and needs to be replaced. Observe polarity. Or,
3) 5 volt B Plus to the infrared LED is defective.

Or I could be treeing up the wrong bark. smile.gif
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post #3 of 4 Old 01-30-2013, 04:53 AM - Thread Starter
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Sounds very impressive....how do I find these things?
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post #4 of 4 Old 09-26-2016, 11:59 PM
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A few years later...but I figure someone might find this thread while searching for help as I did.

Jts1957's advice was right on for my dvr670 unit. Mine had a similar problem. It would intermittently shut off during tape play and then eject the tape when I powered it back on.

Using the clue of reel sensor, did some reading, disassembled my unit, and it is now working properly. Info I found on the web suggests that the reel sensor would be under the take-up reel, but it is not on the dvr670.

On the dvr670 the gear teeth of the take-up reel drives a thicker (taller), smaller diameter gear which is towards the middle of the drive. That gear drives a third gear which has two cutouts in its body. This third gear is overhung by limb from a clear plastic optical prism. The prism is held in place by one screw and is easy to find. It's near the rear center of the cassette space and has a vertical post in addition to the limb overhanging the sensor gear.

After removing the screw and prism, the LED will be found under the prism. With the prism removed the sensor gear can be lifted off its spindle. Under the gear is a hole with the sensor down there. The hole is too narrow for a q-tip.

So the LED can be reached with a q-tip for cleaning. I had to use a small paint brush to clean the sensor. But I think the real problem was some accumulated schmutz on the under side of the limb of the prism. It wasnt obvious, but close examination showed that the clarity of the limb was compromised by a thin layer of something.

In all cases, q-tip or paint brush, I cleaned with 91% isopropyl alcohol.

The problem has not recurred yet.

So thanks to jts1957 and I hope these extra details help someone.
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