Wanted: Panasonic Service Manuals VP-7635A and VP-7637A - Page 1
Forum section: electronics / testgear

author: Astralix
author_rank: Regular Contributor
timestamp: October 21, 2022, 09:12:42 am
content: Hi!Does anyone have the service manuals for the Panasonic Stereo Modulator units VP-7635A and VPP-76377A?There are service manuals for other Panasonic units on the different manual platforms, but only for the more sophisticated units like the audio analyzers and RF generators.Is there anyone in possession of service manuals for these two units and willing to scan them or sell and ship them to me, that I can scan them?Background story:I have used the older VP-7635A Panasonic Stereo Modulator for quite a while, even knowing that it is a little bit unstable here and there. So while you can set the MPS signal output level, it only works stable when connected to my Marconi 2022C. Any SM300 or SMIQ just gives errors about signal levels on the external modulation input being too high or too low.While searching for the service manuals on the older -35A model, I came accross an ebay find of an newer -37A and bought it including the original manual. I hooked it up against my R&S FMA and checked it, disassembled it and found it to be in pristine condition! However, a few values seem to be a little bit out of spec. But the user manual just refers to two potentiometers that are accessible through the front panel. But inside the unit there are another 50 pots to be trimmed...As the unit had been in regular calibration till about 2017. It also carries a MOD Sticker, that looks like a re-capping service and the exchange of some op-amps.So I only trimmed the master oszillator to get the 19kHz and 57kHz pilot tones as close as possible. But the test tones are still a bit off. So I guess there is another stage responsible for the AF.I contacted Panasonic Germany, but they just forwarded me to their repair and service center. But these guy just repair consumer equipment and the even don't use Panasonic test equipment at all. So they quit.Thanks for any additional help!Astralix

author: balvenie
author_rank: Newbie
timestamp: January 08, 2024, 11:16:34 am
content: BonjourJe vois que vous avez le manuel d'utilisation du VP7637APourriez vous m'en faire une copie ou un pdf, tous frais à ma charge bien entendu.CordialementJean Pierre

author: Astralix
author_rank: Regular Contributor
timestamp: December 30, 2024, 02:29:14 pm
content: Sorry Jean Pierre,I am still searching the User Manual and if possible also the Service Manual.Still no luck.

author: salvagedcircuitry
author_rank: Regular Contributor
timestamp: December 30, 2024, 09:12:02 pm
content: I don't know how old this instrument is, but panasonic has a public listing of all of their service manuals. They don't document it anywhere but I believe it's their online servicenet that their certified technicians use. You basically take this link and modify it to the item you desire.The formatting is:www .e-service.css.panasonic.co.jp/Panasonic_ServiceManual(Global%202011)/ALL/officialname/SVC/ordernumber/doc/ordernumber.pdfExample 1:Panasonic Washing machine NA-F65B2Official Name: NA-F65B2Order#PHAT100404C3https://www.e-service.css.panasonic.co.jp/Panasonic_ServiceManual(Global%202011)/ALL/NA-F65B2/SVC/PHAT100404C3/doc/phat100404c3.pdfI have not yet deciphered the order number format, but it's roughly:ProductCategory+numbers+additional charactersPHAT: consumer appliances100404: Date code?C3: revision or version#?Example 2:Panasonic GF1 camera:Official Name: DMC-GF1CPPOrder#: DSC0909058CEDSC = their internal product category for cameras/videoWorking service manual:https://www.e-service.css.panasonic.co.jp/Panasonic_ServiceManual(Global%202011)/ALL/DMC-GF1CPP/SVC/DSC0909058CE/I hope this helps you dig a bit more. I do not know if this system covers older National equipment.I think it's absurd that we have to go to these extents to find service manuals. In the USA, many states have passed right-to-repair legislation, but so far I have not seen any public documentation on real service information, such as calibration procedures on camera sensors and the software needed to do so.