Forum Replies Created
-
AuthorPosts
-
ScruffieMember
Whoops! Glad you got that sorted anyway.
I know it’s called Stereo but as you say there is just a wet and dry output, if you want mono… just only plug in to the wet output, no need to re-wire anything.
The direct output is simply connected directly to the input, that resistor is only there to prevent pop from the footswitch.
You can buy an 18V Boss tipped supply and just use a converter cable like this https://www.gak.co.uk/en/diago-ps04-blue-adaptor/57726?gclid=COi6ptSG3c0CFckV0wodD0MAyA
Don’t drill the enclosure out to change the DC jack!
ScruffieMemberCertainly worth going to a tech with, it’s probably something fairly simple to fix like a dead chip (most assume the worst and that it’s the delay chips that are dead as they are the most expensive part but this is not usually the case) or bad solder joint. Catastrophic failure where you’d consider replacing it is usually reserved for water damage or incorrect power supplies.
If you buy a cheap multimeter you can test the voltages quite easily and I might be able to tell you what’s wrong just from that.
ScruffieMemberSent
ScruffieMemberYa put your multimeter to the 20V DC setting, black to ground (so the enclosure) and red to the pins of all the ICs to test the voltages.
Great, glad you managed to get that sorted.
I think I follow you regards blend and bypass levels, so are you saying when you have only wet signal (so in chorus mode you’re getting vibrato) the volume is dropped compared to bypass? If so that may simply be a case of the gain trimmers being out of alignment.
Do you have a scope or an audio probe for setting them?
ScruffieMemberEHX used to switch up silk screen finishes occasionally, I used to have the same model with purple and silver
ScruffieMemberThere’s plenty of them about, Memory Man EH-7810 is usually just called the Memory Man Echo Chorus or sometimes the Economy Memory Man, the D suffix on the PCB is just a revision to the PCB/Circuit.
Is that a UK plug? How much are you looking for it?
ScruffieMemberCould be any number of things, going to need a bit more information first.
Do you get a bypass signal? When the pedal is on, if you turn the blend pot to the full dry signal do you get your guitar signal and does the level pot have any effect on it?
Also do you have a multimeter and any debugging/soldering experience? If not you’ll probably have to either learn or send it to a tech.
ScruffieMemberI can certainly service it and live in the UK, have done several of them, I can give you a few references if needed.
ScruffieMemberBy the looks of it (and assuming the PCB pin outs match up to the schematic) either the 324 is dead or the 100uF cap coming off pin 8 has gone bad and become a short.
So give the cap a test for continuity and then i’d swap out the 324 if that’s not the case. You could also check for continuity between the 324 pins and the PCB, the traces on the old EHX boards do have a habit of breaking.
ScruffieMemberAre you able to take voltages of the unit? Can only guess without which isn’t a good way to get it going again.
June 26, 2016 at 5:09 pm in reply to: When was the Poly Chorus Stereo Reissue released, and what is it worth? #121668ScruffieMemberI can only speculate, the schematic reference drawing is dated ’97 (so that would be the earliest it would have hit the scene) the copyright is dated ’98 and the actual drawing is dated ’02… split the difference and say they hit the market about ’99/2000?
The wooden box period was from about the late 90s to about 2004/5 so your unit could be from anywhere in that sort of time frame.
Even if it was from ’97 I wouldn’t personally classify it as ‘vintage’ but people certainly do, although I feel that muddies the water of the polychorus ‘legacy’ if you will.
Value wise, well that’s up to the market, personally as the XO seems to be exactly the same i’d say it’s worth the same as a used one of those but people do like the old big boxes… i’d hazard a guess at £200.
Sorry I can’t be more specific, maybe someone else will know more.
ScruffieMemberPost voltages of all the ICs please.
ScruffieMemberStart by posting the voltages of all the ICs and FETs please.
June 16, 2016 at 10:28 am in reply to: Need help with Bad Stone power wire location on pc board #121624ScruffieMemberAhh, no, the wall wart is grounded through the chassis on these old EHX effects.
June 13, 2016 at 6:43 pm in reply to: Need help with Bad Stone power wire location on pc board #121621ScruffieMemberThe power wire should be that black one to the top right of your picture that’s hanging off.
See this image;
-
AuthorPosts
