PL7000S2

George S.

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Cleaning the grounds on the LMV-185A meter.
Both PL259 jacks were slightly loose and packed with crap causing a intermittent ground connection.

I may have a line on some NOS Sendust heads as used on the later Japan version of this deck, the CT-A1.
Will they work without internal modifications?
Don't know. Unable to source a late production CT-A1 with Sendust schematic for comparison.
Perhaps the great number of trimmers in this deck will allow that alignment.
Projects on hold until I source heads.
I'll try Sendust before trying the black ferrite Alps.
 

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George S.

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Well, today my son received a package at the house from NHE Components, Beirut Lebanon, that should have two NOS Pioneer Sendust sandwich heads in it.
I'm on a slow, leisurely, cross country road trip. I'll see what they sent me once I get back home.
Hopefully it's not a pager! :)
Also ordered one of the Chinese M300 gauge clones, the one with the brass screws.
I do have a very good Mitutoyo digital micrometer to check it's thickness for setting head height.
 

Gepetto

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Well, today my son received a package at the house from NHE Components, Beirut Lebanon, that should have two NOS Pioneer Sendust sandwich heads in it.
I'm on a slow, leisurely, cross country road trip. I'll see what they sent me once I get back home.
Hopefully it's not a pager! :)
Also ordered one of the Chinese M300 gauge clones, the one with the brass screws.
I do have a very good Mitutoyo digital micrometer to check it's thickness for setting head height.
Yeah double check those heads George. You never know when they might go off...
 

George S.

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Here's a interesting video of the late CT-A1/Sendust head service with some interesting info on the unit.
Google translate works well for the print.
He also has a video on the early CT--A1/Ferric head, and a link to his site.
Wish I understood Japanese.
There's a link to his site, and his repair business.
Once I get home and can get on a Windows computer rather than the phone, I'll attempt to join his group and hopefully score the schematics.
I did find another site in Europe where they rebuilt a late model with Sendust heads using the PL7000S2 manual.
There were added capacitors across some resistors that weren't shown on the PL schematic.
 

George S.

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No Lee, haven't done so.
I'm thinking they're probably on microfiche and had very limited distribution to Pioneer Service Centers only in Japan.
 

George S.

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Got the NOS Pioneer Sendust heads measured with the DE-5000. Very similar results to each other, that's good.
They are similar but slightly different from the Canon Sendust head measurements Alex made available on his website document (Thanks).
I did measure series inductance rather than parallel inductance because the coil resistance was low.
 

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