[TechAssist] Re: Sony SLV686 VCR Play problems
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 25 May 2005 13:19:32 -0700 (PDT)
In checking the signals to and from the micro for the capstan, it started
playing back normal and I could stop and start the play mode which I couldn't
do before. I ran it in play for about 5 min. Which I couldn't do before. So I
am not sure what exactly is going on. I have another Sony that uses the same
MD49 board that works, and am comparing voltages and signals. The main board is
different, so am limited there. This is spooky.
Paul
J Silverman <greentron@xxxxxxx> wrote:
The capstan drive voltage is much lower in play/rec than in other modes, so
if the rotor is rubbing it might stall out just in play/rec. If you take the
belt off and turn the flywheel by hand you might feel the rubbing. But the
proof is to remove the motor and look at the air gap between rotor and
stator. Also if you pull the rotor you can see the abrasion marks on the
coils from the rubbing. I recall that when that was a big problem sometimes
the rubbing did not happen until the vcr had been running for 30 minutes or
so. We used to use a center punch to put a dimple in the bearing cap to
increase the air gap.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: "Paul"
To:
Sent: Tuesday, May 24, 2005 1:51 PM
Subject: [TechAssist] Re: Sony SLV686 VCR Play problems
> The problem does not exist in FFor Rew. It seems like a bearing problem
would be evident in all modes that the capstan is running in. The capstan
runs during load and unload as well. Play mode is the mode that it doesn't
run in.
> Paul
> Christopher Barnak wrote:
> It could be the Capstan motor binding up.
>
>
> It may just need the capstan motor bearing sleeve X26253761, It gets
> warped.
> (Most likely)
>
> Or a bad capstan motor :
>
> FOUND CAPSTAN MOTOR ROTOR RUBBING AGAINST PLATE REPLACE CAPSTAN MOTOR
> (PN: 8-835-394-11)
>
> Just guessing. But it the capstan motor does not run intermittently,
> it's a good guess. I've seen it many times.
>
>
> Christopher Barnak, CET
> Norfolk Public Schools
> Electronics Maintenace
> 966 Bellmore Ave.
> Norfolk, Va. 23504
>
> Phone 757 628 3385
> Fax 757 628 3392
> cbarnak@xxxxxxxxxxxxx
>
>
> >>> dntwntv@xxxxxxxxxxxxx 5/23/2005 8:14:31 PM >>>
> This unit will not go into play mode most of the time. It will load
> then shut down most of the time. It will FF/Rew normally most of time.
> It will Rec, then after Rew, it will play sometimes.
> It will eject most of the time. The capstan does not run when it shuts
> down. Ocassionally the capstan will start but does not continue. The PG
> & FG pulses out of the drum are normal and the drum runs when tape is
> inserted. I have replaced the cam gear and the idler gear to the motor
> because of damaged teeth. I have cleaned the mode switch twice. The
> switch is NLA. I have checked the timing upper and lower several times.
> Doesn't seem to be a capstan problem. What am I overlooking? One other
> thing, the automatic tracking words flash rapidly whether it plays or
> not.
> Paul
>
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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