[TechAssist] Re: Panasonic Camcorder PV-A286 (similar PV-A306)-Audio Problems-FIXED
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 23 Nov 2002 16:46:13 -0500
I have had bad bias oscillator coils and transistors but I mention the
capacitor because that was usually the reason for the coil or transistor
failure. sometimes you can see signs of electrolyte leakage but other times
you need to use the ESR meter to tell if the cap is going to be a problem.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: <rogerfixit@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 23, 2002 1:51 PM
Subject: [TechAssist] Re: Panasonic Camcorder PV-A286 (similar
PV-A306)-Audio Problems-FIXED
>
> Swapped A/C head 'cause it was easy to do - no better.
> Started checking components in Bias ckt and was able to compare with an
> L657 that I had - found T4001 - bias oscillator read differently one to
> the other.
> Swapped it and it worked.
> Thanx
> Roger G.
>
> Mr. Fix-It Harrisburg, PA 17110 WebSite-
> http://mrfixit.netfirms.com
> rogerfixit@xxxxxxxx (alternate - rogerfixit@xxxxxxxxxxxxx )
> FAX 801-705-3748 ; Tel: 717-763-7098 (shop) 717-652-1703(home)
>
>
> The only suggestion I can make at this time is that you need to see if
> the
> bias oscillator is running in record. Almost impossible to do from the
> board
> side without the cable sets or at least a Side L connector unit. But if
> you
> take the Cassette Cover Unit off, you may be able to get a scope probe to
> the A/C head. If the bias oscillator is not running the first thing I
> would
> check is C4026, the bias oscillator power filter cap, 22/6.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: <rogerfixit@xxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, November 22, 2002 1:13 AM
> Subject: [TechAssist] Re: Panasonic Camcorder PV-A286 (similar
> PV-A306)-Audio Problems
>
>
> >
> > First 'number' is "F" second is 6. This could make sense since the
> Fiche
> > is dated 06/96. The PV-A306 is dated 01/96.
> > Roger G.
> >
> > Mr. Fix-It Harrisburg, PA 17110 WebSite-
> > http://mrfixit.netfirms.com
> > rogerfixit@xxxxxxxx (alternate - rogerfixit@xxxxxxxxxxxxx )
> > FAX 801-705-3748 ; Tel: 717-763-7098 (shop) 717-652-1703(home)
> >
> > On Thu, 21 Nov 2002 20:58:09 -0500 "J Silverman"
> > <greentron@xxxxxxxxxxxxxxxx> writes:
> > >
> > > Give us the model year (first numerical digit in the serial number)
> > > and I
> > > will see if I have any data on it or other models from the same
> > > year.
> > > Jerry Silverman
> > > Greentron Inc
> > > 4 Newland Ave
> > > Greenville SC 29609
> > > 864 232 3889
> > > Fax 271 2080
> > > mailto:greentron@xxxxxxx
> > > ----- Original Message -----
> > > From: <rogerfixit@xxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, November 21, 2002 2:58 PM
> > > Subject: [TechAssist] Panasonic Camcorder PV-A286 (similar
> > > PV-A306)-Audio
> > > Problems
> > >
> > >
> > > >
> > > > Panasonic Camcorder PV-A286 (similar PV-A306)
> > > > Problem- Does not record audio OR erase old audio. Will playback
> > > > previously recorded Audio. Video in all modes - fine.
> > > > Suspect Flying Erase head but - pulled drum and checked physically
> > > -
> > > > 'looks' OK and do get small Ohm reading across terminals
> > > (2.6ohm)(Video
> > > > heads read 0.8)
> > > > Since the Audio (A/C) head plays back, figuring it is probably OK.
> > > Even
> > > > if the Erase head is bad, shouldn't I get some audio recorded over
> > > the
> > > > old audio ?
> > > > Mike is good- can hear thru monitor in Camera mode.
> > > > I know there are electronic switches to turn on FE head and to
> > > switch
> > > > from PB to REC in audio IC. Also that even if head is OK, pick-up
> > > of head
> > > > ,may be bad.
> > > > Any had experince with this problem?
> > > > Customer in a hurry, of course
> > > > Roger G.
> > > >
> > > > Mr. Fix-It Harrisburg, PA 17110 WebSite-
> > > >
>
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