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Post by paradisecs on May 26, 2018 21:59:07 GMT
I was testing out a newly acquired SHP3 amp. I swapped it out of my personal STD160 that works without flaw. After choosing a record it plays, reaches the end of the song, then gets stuck in a loop loading and unloading the same record. If I put the original AMP back in this doesn't happen so I don't think it is a lubrication issue. What electrical issue would there be in the AMP to cause this? I have to assume that when the phono works fine with my original amp in that it has to be something electrical with the new AMP.
I have read Ron's guide on this. Again, I've ruled out switch adjustments, and clamp arm switch adjustments because it works when the original AMP is put back in. What in the AMP could be shorting out? If it matters, there is an PRVC installed with a remote for volume and reject. But again, it works with the original AMP.
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Post by Ron Rich on May 27, 2018 2:40:33 GMT
Need more info--is the detent relay being held energized after the record plays, or being re-energized ? Try holding down on the detent lever after it falls down--does it get an electrical pulse ? Is the correct relay installed in the SHP ? ( If you read the guide, you would know that the clamp-arm switch was not used in this circuit, on this model !)Ron Rich
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Post by paradisecs on Jun 15, 2018 23:22:42 GMT
So my initial theory went out the window. It no longer mattered what amp was installed. Pulled the mech and washed and de-greased, cleaned all contacts, re-greased and re-oiled. Put the unit back in and it worked fine for about 5 plays. If I push on 2m11 it is hit or miss. Sometimes is is the correct spot and I can feel the contact move and the unit rejects. Sometimes it seems like the switch is already in contact and doesn't move when pushed. If I manually left the reject lever on the back of the mech it will move to the next song and then be stuck in the loop again. Could there be something bound that isn't a lubrication issue? I'll put the mech again this weekend and check adjustments.
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Post by Ron Rich on Jun 16, 2018 4:21:54 GMT
Didja read the above ?? Start over--Read the electrical sequence of operation in the mech guide-- then tell us what's happening ?
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Post by paradisecs on Jun 16, 2018 23:13:26 GMT
Yes, that is next on the list. I wanted to clean it first since I'd never done this one. I think now it was just coincidental that it happened when I changed amps. So step 1...clean and lube. Then follow the guide. The correct relays are installed. I'll check the detent lever once I get home.
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Post by paradisecs on Jun 17, 2018 1:48:26 GMT
I held down on the detent lever as suggested. I'm not sure whether or not it got a pulse, how would I know?
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Post by Ron Rich on Jun 17, 2018 2:35:05 GMT
If you are holing down on it "lightly", you will feel the pulse--did the record play ? Ron Rich
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Post by paradisecs on Jun 17, 2018 4:34:16 GMT
No, I didn't notice a pulse. I'll check for that again.
If I push the blades while a record is playing 2M1 one of two things happen. It either makes contact and trips the trip solenoid in which case I know immediately that it will go in to the loop. Or when I push the blades of 2M1 together nothing happens and the song finishes and moves on to the next selection.
I don't know if any of that matters but I'll check for the pulse and let you know. I've been zapped pretty good working on various things over the year so I may have ignored something minor.
I read one of the sub-notes in the troubleshooting guide where you mentioned picking up a record and immediately returning it to the rack as a dead giveaway to problems in the popularity meter but I'm not quite sure if that relates to this or not.
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Post by Ron Rich on Jun 17, 2018 12:46:50 GMT
Do you know how to properly,clean contact points ? If so, clean and check the #M1 contact adjustment. If not see our FAQ's section above for instructions. Also, which DCC, and which code, is installed in your phono. What relay (12 or 24 VDC)? Ron Rich
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Post by paradisecs on Jun 17, 2018 16:51:51 GMT
DCC3 Code B 12V relay. Visually it seems like the lever that pushes back on the 2m1 contact isn't always moving to the same location, sometimes it pushes further back than others. The difference is so small that I may have just convinced myself this is so. I'll get out my gap blades and check out the adjustments on M1.
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Post by Ron Rich on Jun 17, 2018 17:19:45 GMT
OK--that DCC should work fine--Made a typo above--"#" should read "3" Properly clean the 3M-1's and the Detent relay contacts, as I think your problem is in the trip circuit--don't mess with the 2m1's. Ron Rich
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Post by paradisecs on Jun 17, 2018 22:25:01 GMT
I think I have narrowed down the problem to a mechanical issue. Something seemed odd in the feel of manually tripping the release lever. I pulled the mech out and examined the mechanics of it a little closer. The sequence of operations that I think are supposed to happen are the following:
1) The release lever pushes down on a roller (haven't determined the name of that roller yet)
2) That roller then pushes down and moves the reset lever back to trip 2m11
My mech isn't pushing down on that roller in step one most of the time, it is wedging itself to the right of it causing then entire assembly to move left a fraction. If I put a flat schrewdriver between the reset left and the roller then trip the release lever everything feels normal. Is this and adjustment issue? If so I don't understand which one. It almost feels like a c-clip has come off and the roller is out of position.
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Post by Ron Rich on Jun 17, 2018 22:35:19 GMT
If you are not going to read what is posted, please do not post any more--Your problem is electrical if "pushing" on the 2M1 contacts causes it to trip while playing ! The 2M11 contacts are in a totally different circuit !
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Post by paradisecs on Jun 17, 2018 23:06:37 GMT
Ron, I'm not trying to ignore you and your advise, far from it. I take it whole heatedly then dig deeper which leads to more questions. But doesn't the mechanics of the trip lever affect all of the 2m and 3m contacts as well as the trip solenoid? When the trip lever isn't hitting the center of the roller and instead slides off to the right then the levers pushing back on 2m and 3m are not in the correct spot. It is also keeping the trip solenoid lever from lifting up all the way. I thought this mechanical issue is what is causing the switches to not make contact when they should. If I wedge the roller over then all three switch points, (trip, 2m, and 3m) function correctly. They may still have an electric issue but the mechanics are correct. Here is a picture of the trip lever and the roller in question. When it is like this rather than centered on the roller then non of the electrical contacts are in the correct position because the levers are not fully positioned in the correct spot:  |
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Post by Ron Rich on Jun 18, 2018 4:10:13 GMT
Can't tell which roller that is--looks as if it's left of it's cam-- use your manual to ID it-- or see why it can get so far off and fix it.
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