Manual 4 Panasonic VP 7635A ? - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd September 2016, 01:28 AM   #1
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
Default Manual 4 Panasonic VP 7635A ?

Hi Y'all,

Anyone have a manual, schematic, service information for the
Panasonic VP-7635A. It's a FM Multiplex Generator.

In need of assistance and the one place that had one
donated everything to the Web Time Machine thing
never to be seen from again.

Cheers,

Sync
__________________
-- Sync
  Reply With Quote
Old 3rd September 2016, 09:22 AM   #2
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
vp-7637a_outline.html
This is all I can find on it.
__________________
Support for Fender, Marshall and all Valve Equipment including Audio Innovations, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 5th September 2016, 12:53 AM   #3
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
Quote:
Originally Posted by JonSnell Electronic View Post
vp-7637a_outline.html
This is all I can find on it.
@JonSnell, Thanks for looking. I found that, too. I contacted him
and aksed if he had a manual, schematic etc to no avail.

I also found something written in french for the VP7635a.
But not what I was looking for.

Another DIYer was kind enough to send me a manual for a VP8174a
unit in hopes it might assist me. The actual units are so dissimilar that
I can't use it to trouble shoot or work from on my VP7635a with my
limited background. There are some good GPIB code examples though.

It is what it is.

Cheers,

Sync
__________________
-- Sync
  Reply With Quote
Old 5th September 2016, 07:04 AM   #4
diyAudio Member
 
Join Date: Jan 2007
Location: BC, Canada
What's wrong with yours?
  Reply With Quote
Old 6th September 2016, 09:26 PM   #5
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
3 of the 4 Latching Switches are broken, won't latch.
I think they are called Shadow Switches?

The guy I got it from, didn't notice the Outer Rings were removed
when cleaning the unit.

Then I'm pretty sure the same cleaning guy also turned the
calibration pots when he removed the stickers from them.

When I opened it up to inspect, it looks fine inside, and showed
no signs burned parts or over heating etc. So I put it back together
to try and figure out why only the 19kHz tone worked and none
of the other tones, etc.

Only to discover that when I pressed and held in (a certain amount)
I would see the tone on my scope. Then I reexamined the switches
and discovered 3 didn't have the ring that would hold the latch mechanism.

These switches control the External and Internal Tones,
which left or right channel is internal or external, during
dual tone mode, or/and which single tone is internal or external.


EXT - Good
L - R

Dual Tone - Bad
INT L
EXT R

SINGLE TONE
EXT - Bad
INT - Bad

I'll attach a pic.

If I had three other switches or the applicable latch hold mechanism
then I could see what else would need to be accomplished to get this
instrument running correctly.

Cheers,

Sync
Attached Images
File Type: jpg VP7635 InputSignal.jpg (82.2 KB, 30 views)
__________________
-- Sync
  Reply With Quote
Old 6th September 2016, 10:33 PM   #6
diyAudio Member
 
Join Date: Jan 2007
Location: BC, Canada
I had the same issue before, it's not the TC9135 analog switch but a faulty 74xx244 tri-state buffer that ultimately drives the control lines for the TC9135. U35 and U36 are likely bad.

The latching of the push button switches is done electronically.

Last edited by hitachi_nut; 6th September 2016 at 10:45 PM.
  Reply With Quote
Old 6th September 2016, 11:53 PM   #7
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
Quote:
Originally Posted by hitachi_nut View Post
I had the same issue before, it's not the TC9135 analog switch but a faulty 74xx244 tri-state buffer that ultimately drives the control lines for the TC9135. U35 and U36 are likely bad.
@ hitachi, are we discussing the same model, the Panasonic/National VP-7635a?

These are four latching switches of which three of them no longer have
the part that keeps them latched. I presume that is the rim around them.

Only the first on the left will physically latch when pushed in.
The other three, want to latch but they are missing outside piece
or rim which should hold it in the latched position.

Now, I cannot answer about their electronic function other than
it is possible in that latch position it also functions as a relay?
And whatever voltage that should be there to hold the switch
in the latched position breaks, because there is noting physically
to retain it.

The other push switches that you describe are those the non-latching
switches that illuminate when pressed?

For this model the latching of the push button switches is
also done electronically?

I don't know as I don't have a schematic.

Please understand I'm not arguing, I just want to ensure that when I
start pulling and replacing parts that the problem doesn't remain.

On other models that I've seen of this meter they ALL have the
rim around the switch on these first four latching switches.

Attached is a pic of the VP-7633, which also shows the different
switch types. The four on the left are the latch switches. Besides
these four and the power switch, all the other push switches are the
standard Panasonic/Matsushita/National electronic type. The ones
with the lamps in the center.

The follow on model to my VP-7635a is the VP-7637 which doesn't
have the latching switches any longer. I just have to be sure on this.

Cheers,

Sync
Attached Images
File Type: jpg VP-7633 Front Panel.jpg (87.8 KB, 28 views)
__________________
-- Sync

Last edited by SyncTronX; 7th September 2016 at 12:13 AM.
  Reply With Quote
Old 7th September 2016, 04:14 AM   #8
diyAudio Member
 
Join Date: Jan 2007
Location: BC, Canada
Duhh. I was thinking of the soft switches that are electronically latched that get stuck electronically. Sorry.

OK now to the mechanical latches, when you have the rightmost ("INT") of the group of four pushbutton switches pushed in, does the output drive the selected internal frequency (30Hz to 15kHz)?

Here's my unit's 4 pushbuttons with "INT" engaged. I don't see any outer ring mine.
Attached Images
File Type: jpg VP-7635A_pushbutton.jpg (953.4 KB, 27 views)
  Reply With Quote
Old 7th September 2016, 04:42 AM   #9
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
Quote:
Originally Posted by hitachi_nut View Post
Duhh. I was thinking of the soft switches that are electronically latched that get stuck electronically. Sorry.

OK now to the mechanical latches, when you have the rightmost ("INT") of the group of four pushbutton switches pushed in, does the output drive the selected internal frequency (30Hz to 15kHz)?

Here's my unit's 4 pushbuttons with "INT" engaged. I don't see any outer ring mine.
@hatachi, No worries, that is why I asked, to be sure.

Now the function or lack thereof, It is supposed to, yes. But, that push button doesn't engage and stay in. I have to hold it with my finger manually on the engagement point, then I can press the soft switch and then I can see the Tone on the output.

Now, I'm not sure if the output drives the selected internal frequency.
I assumed there was and internal oscillator in the unit. If that is what
you mean by the output drive then yes.

I think I can only view the opposite side side of the pushbutton switches,
the latching is on the other side. I'd have to disassemble the unit more
to see. I want to say they have the bronze latches and the latches you
show are the newer plastic style.

Cheers,

Sync
__________________
-- Sync

Last edited by SyncTronX; 7th September 2016 at 04:51 AM.
  Reply With Quote
Old 7th September 2016, 05:54 AM   #10
diyAudio Member
 
SyncTronX's Avatar
 
Join Date: Oct 2008
Location: Cubs Win! 108 Years - anguish no more.
Blog Entries: 6
Got some other pics of the latches. They are same as yours I believe.
With the white plastic. I think the latch is on the board side.
I didn't remove mine, didn't know if two or four screws plus
desoldering a few leads. It looks tight to get in there.

Cheers,

Sync
__________________
-- Sync
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Panasonic VP-7723A HELP Babylon_audio Equipment & Tools 17 13th February 2017 03:20 PM
Download manuals PANASONIC VP-7722 ghg Equipment & Tools 4 31st July 2016 02:14 AM
WTB: Owner's manual for Panasonic VP-8175A FM/AM Signal Generator Cognition Swap Meet 0 1st April 2015 10:06 PM
FS: [VIENNA] Audio Analyzer Panasonic VP-7722A ghg Swap Meet 5 12th January 2015 01:23 PM
Help with GPIB with Panasonic VP-77xx series paba Equipment & Tools 7 2nd November 2013 04:35 AM


New To Site? Need Help?

All times are GMT. The time now is 08:59 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki