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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Well, it’s kind of been a
frustrating day for me. I went over there on my lunch hour intending to
tear into the machine with tou ttems given below, as well as a few more that
Chris Hill gave me over the phone.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I had requested their staff to turn on the
compressor and machine so they’d be ready and warmed up when I got
there. However, the one guy told me that the circuit breaker had thrown
itself several times. I didn’t think much of it, as this happens
periodically.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>So I prep the tape (it had been baking for
three days), and went to take the other tape off. Hit the Thread button,
and NOTHING. The headwheel wasn’t turning at all! All the
fuses on the HW PA cards were good and none of the “Fuse open”
lights were on. I put the card on an extender, and found the +80 v rails
were ok. The triangular signal was there, but none of the others
were. I then went to the “Control B” card and found that the “HW
Run” output was running and responding. So the problem is between
the Control B board and the HW PA’s. I made a quick call to Chris
Hill, who confirmed that I was on the right track. I then called my
friend who has also worked on these, and he said to look at the rest of the
power rails. Well, the -12V is at 10.4V on the card, but at -12.0 at the
supply. I cranked it up to 11.4V on the card, but it’s at 12.8V.
And that’s as high as I dare go with it. My friend suggested that I
reseat the molex connectors, as he has found them to be particularly
troublesome. I did so, and found some iffy ones; but alas, no improvement.
In the midst of all this, the circuit breaker blew several times. By this
time, I am out of lunch hour; so I had to leave. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I may have time tomorrow to go back, if
not, then Thursday.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Any advice?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If nothing else, thanks for listening to
me rant a moment. Nothing I hate more than, having to fix something
before you can fix something…. And I had all these great ideas—and
can’t even try them! :-/<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoAutoSig><st1:PersonName w:st="on"><font size=3 color=gray
face="Brush Script MT"><span style='font-size:12.0pt;font-family:"Brush Script MT";
color:gray'>Fred Kovach</span></font></st1:PersonName><font color=gray
face="Brush Script MT"><span style='font-family:"Brush Script MT";color:gray'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Broadcast Technician<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p><font size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:blue'>417-848-8381<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> QuadList
[mailto:quadlist-bounces@quadvideotapegroup.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>chill315@aol.com<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, November 11, 2013
5:59 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Quad
List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [QuadList] TR-600
Control Track/Capstan Servo Issues</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Interesting problem. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> Did you demagnetize the control track head after checking
continuity? <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Is there edge damage on the problem tape?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> Fugi tape uses a stiffer base layer and is renown
for being easy to damage. If there is a little scalloping on the lower
edge, that would be an issue. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>What does the control track playback waveform and level look like?
I see that you tell us the level changes a couple of minutes into the
program. But does the control track show the saturation bump?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Comments. Using capstan speed override shows that all other parts
of the machine are working. The unlock every few seconds is normal since
there is no control of the capstan. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>This may be a tape for an AVR-1. The machine that can play anything.<br>
<br>
Chris Hill<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
On Nov 10, 2013, at 9:38 PM, "<st1:PersonName w:st="on">Fred Kovach</st1:PersonName>"
<<a href="mailto:fkovach@sbcglobal.net">fkovach@sbcglobal.net</a>> wrote:<o:p></o:p></span></font></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite>
<div><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><u1:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName">
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'><!--[if gte mso 9]><xml>
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</xml><![endif]-->Note:</span></font></b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> I sent this originally on October
31, and it apparently never posted (I wondered why I never received any
replies!!!) </span></font><font size=2 face=Wingdings><span
style='font-size:10.0pt;font-family:Wingdings'>J</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have since added a couple of notes of what Ibve
done. Any advice that you can give me would be greatly appreciated.<u1:p></u1:p></span></font><o:p></o:p></p>
<div style='border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 1.0pt 0in'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am working on a RCA TR-600A thatbs having a tracking
issue. This has been an ongoing problem for about three months; and my
usual source of information is at a loss. Hebs been very helpful and gone
out of the way to help me; but I think it is time for me to check with you guys
on this.<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It is not locking up to control track on what was our most
reliable playback tape (<st1:place u4:st="on"><st1:city u4:st="on"><st1:City
w:st="on"><st1:place w:st="on">FUJI</st1:city></st1:place></st1:place></st1:City>
tape stock). After some amount of troubleshooting on the C18 CT Amp card,
I found two bad chips: U1 and U7 that was basically switching between the pb
and rec CTL heads. So the machine was in PB mode, but half the card
thought it was in record! I also replaced some capacitors on that card,
After that, it would still not lock up on the FUJI tape, but would lock up to a
VTC tape stock that had a higher level CT track on it. Actually, it wouldnbt
lock at the beginning of the tape where the CT was lower level, but apparently
whoever recorded in, turned up the record current about 2 or 3 minutes in!<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have done the following:<u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked continuity from the CTL
head to the C18 card. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked grounds/shields on the
same path. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked power supply voltages
at the power supply and the card. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Replaced a flaky R307 on the
power supply, which was throwing the +12 VDC supply all over the place
whenever I even thought of touching it! <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Cleaned the power supply
interface molex connectors with contact cleaner. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked grounds on the back
plane. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked wirewrap connections on
the back plane. Especially those that I re-did in Summer 2012 when I
took out the Auto Editor (AE600) on the advice of my friend. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thoroughly cleaned the path and
checked out the problem with two other spare headwheel assbys we have on
hand. However, the HW assby that I had in there has the best
performance. My friend found that it had less than 1 micron wear; so
I put it back in. Also adjusted tip penetration and scalloping. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checked the inputs from our
sync generator. </span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Varying the capstan speed from
the control panel, will bring it pretty close to locking up, but of
course, you have an b occasionalb skip every two or three seconds. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Had my friend check a boatload
of cards in his machine, all of which worked, except the aforementioned
C18 card, which in spite of my best efforts apparently still had issues
(see below). <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Swapped C18 cards with another
known to be good after my friend found that my C18 card didnbt work in his
machine. After the new card, the VTC tape would lock up a little
earlier in the program. So that was progress. J But
still no lock on Old Reliable Fuji tape. Also, Ibve had to abandon
the VTC tape, as it was clogging up the heads a lot; even after baking
it. Donbt want any more trouble than I have already! ;) <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Varied the three pots on the
C19 card (capstan balance, symmetry and level, I think) and one on the C20
card. All on the advice of my friend, to see if they helped.
We got perhaps marginal improvement. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Therebs probably a few other
things that Ibve forgotten. If necessary, Ibll post them as I
remember them. But I did write my work down, so this ought to be
most of them. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I went through the capstan
servo alignment section of the manual (ecept for the record functions,
since this machinebs record doesnbt work), and found it needed some minor
adjustments. However, nothing major. I did find that the Color
Framer card was missing and in itbs place was the Guide PA card!!
However, Ibm told that the Color Framer is only used for editing and is
not necessary for playback. The Guide PA card works just fine in its
proper place. But it didnbt solve the problem. And I should
note that since apparently these two cards have been out of place for some
time, that the machine would have been working fine with them out of
place. If this makes senseb&.</span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am thinking of doing the following the next time Ibm
there, which might be tomorrow (Monday):<u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l2 level1 lfo6'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Digging into the backplane a
little deeper and confirming all the mods I did when I removed the
AE600. Ibve already done this thoroughly once, but my friend thinks
the problem might be there; so Ibll do it again. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l2 level1 lfo6'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checking the levels coming off
the CT heads of the three different headwheel assbys to see if I can find
any kind of pattern for this.</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l2 level1 lfo6'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Checking the circuitry
surrounding the CT Phase adjustment because when it does playback the VTC tape
properly, I have to turn it fully clockwise for it to lock up. <b><span
style='font-weight:bold'>Is there a way to get it so that this control
works closer to the center of the pot?</span></b></span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I appreciate any help you can give me on this. I may
be able to take some pics or video of waveforms if it would help.<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks so much!<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Fred<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><st1:personname u4:st="on"><st1:PersonName w:st="on"><font
size=3 color=gray face="Brush Script MT"><span style='font-size:12.0pt;
font-family:"Brush Script MT";color:gray'>Fred Kovach</span></font></st1:PersonName></st1:personname><o:p></o:p></p>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Broadcast Technician<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>417-848-8381<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><u1:p> </u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><u1:p> </u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><u1:p> </u1:p><o:p></o:p></span></font></p>
</div>
</blockquote>
</u1:smarttagtype></u1:smarttagtype></u1:smarttagtype>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>______________________________________________<br>
Please trim posts to relevant info when replying.<br>
<br>
Change subject to reflect thread direction. Thanks.<br>
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