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Post by prime on May 27, 2022 19:45:28 GMT
Hi guys i built a full wave rectifier and reinstalled the power supply, powered up with dim watt tester, no short. I used the selector and selected A7 , write in wheel spun and stopped at A7, hammer fired as per normal and pushed pin, read out spun and basket and arm stopped at A7, after that nothing, turntable started spinning but no more movement. I tried another selection no change. I disconnected power and manually turned gripper motor to place record on turntable, arm moved and dropped, i turned power back on and turntable spins but when i moved the arm to reject , i hear a click but no movement. At the moment i have the amp removed, does the amp have to be connected to make this work? I never seen the unit work so im still not sure if it had issues before the burnt rectifier. When the gripper arm was over the record i checked the cam and number 1 switch was in the groove as per specs. Any ideas.
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Post by jukenorman on May 27, 2022 21:02:45 GMT
Pete,
What exactly were to trying to achieve by winding the gripper motor manually? I despair - I sent you the manual, why didn't you refer to it? You had got to Read-Out Sequence 5, why didn't you look at the schematic to see what might be the problem? The manual gives you narrative and the accompanying diagram shows the circuits that are "hot" in bold. You need use the "friendly" manual!
Norman.
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Post by Ron Rich on May 27, 2022 21:12:51 GMT
Hey Norman,
You done taketh the words right out of my mouth-- was going to reply "RTFM, RTFM,RTFM"-- but no need to now !
Pete,
The schematic will show if that amp needs to be in the stream of things--- It may--Seeburg non-tube amps use the relay to start the transfer process-- Ron Rich
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Post by prime on May 27, 2022 21:22:00 GMT
I have the manual from Victory Glass also, i was confirming nothing was jammed, The contact 5 was working perfectly before i repaired the rectifier so i was was worried this had something to do with this. I looked at the schematics and for me this is a bit of a challenge, i see contact 5 but im not sure where it is on the unit.
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Post by prime on May 27, 2022 22:07:51 GMT
I get rtfm, i see it alot, i have read sequence 5 ,i know the release armature relaxes and transferring contacts 5, i also know this is what stops the magazine motor. I know all is good until then, i have an issue with the same contact that short circuits the magazine motor also is suppose to now complete the circuit to the gripper motor. Not sure how one part can work, the other not when its the same contact. I do need to learn how to read schematics and will probably take a course once they start again. But i see 5 twice and dont understand how they are the same contact.
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Post by prime on May 28, 2022 0:33:10 GMT
Hi the interlock relay has two sides, one side allows the read out carriage hammer to operate when micro switch 2 is transferred, in that switch area something affects the basket, is it normal for it to lock up and stop the basket randomly ?
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Post by Ron Rich on May 28, 2022 2:56:41 GMT
Hi Pete,
Look at the schematic-- see the two wires to that motor ? Follow them backwards FROM the motor, to their sources-- One will go to "hot 25VDC" The other to "ground". I do not have access to any RockOla manuals, but I think they "switched (on) grounds". So the ground will go to the motor, when it is supposed to run, in one direction, the other wire upon the need to run in the other direction. Being a DC motor-- the ground, and hot side, are changed (switched), thru the relays under the mech board, to make it run in two directions.
HTH Ron Rich
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Post by jukenorman on May 28, 2022 8:19:50 GMT
Hi Pete,
Keeping it very simple - have you ever seen that gripper motor operate electrically? Might the motor require attention?
Norman.
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Post by prime on May 28, 2022 10:07:47 GMT
Before i replaced the rectifier, i was able to use the pins on the read out side to select records, with the pin manually engaged the read out wheel and basket spun until the read out hit the lever, then the gripper motor started and put the record on the turntable that was already spinning, i could then use the tone arm to reject the record and the gripper motor reversed and returned the record, it was a slow process because i was only getting 16 volts instead of 25. As you know before i replaced the rectifier the write in would not work, now the write in works perfectly when numbers selected, read out and basket spins to the engaged pin, turntable spins then nothing, gripper motor does not power up, turntable still has power.
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Post by prime on May 28, 2022 10:15:48 GMT
Photo of rectifier, the rectifier has been secured since, so no chance of shorting out, 3 amp fuse was added between transformer.  |
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Post by Ron Rich on May 28, 2022 11:10:34 GMT
Hi Pete,
Comparing the two photo's it appears to me that 1. you are missing an AC wire (cloth covered red/black) to your diodes--
And 2. that you have "shorted out" the right most diode with a bit of black wire soldered on both ends of it ? Ron Rich
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Post by prime on May 28, 2022 15:30:28 GMT
The cloth colored black and white is now the lower red one, it is connected to the red because there is a 3amp fuse in line to protect the transformer. The two black wires are the ones that were connected together on the original rectifier, if i read the attached schematics correctly they are meant to be connected to the - side of the two diodes, the only thing i wonder does the rectifier need to be grounded separately to the frame as the original one was pete ps the black wire you see at the right most diode is running under it, the bare wire you see is from the red wire it is wrapped about three times  |
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Post by prime on May 28, 2022 15:41:56 GMT
Hi Ron by the schematics, how would i know where switch 5 was?  |
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Post by jukenorman on May 28, 2022 16:16:30 GMT
Hi Pete,
Switch 5 is on the interlock release relay as it says on the diagram. If you are making selection A7 and the magazine motor is stopping at selection A7, then that switch is not the issue because the magazine motor is being dynamically braked through that contact. The same contact then forms part of the gripper motor circuit. So that leaves #2 micro switch or the contact of the reverse relay as suspects. #2 micro switch has to be OK because if you look back at the previous sequence (RO sequence 4), #2 micro switch is in circuit for the operation of the magazine motor.
So that leaves you with the reverse relay contact, broken wire / circuit break or defective gripper motor as your problem. Can you follow the logic of what of what I've posted when you study the schematics?
Norman.
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Post by Ron Rich on May 28, 2022 16:24:14 GMT
Hi Pete, You need to L@ k for it-- RockOla shows "switches" as a line connected by one or two other lines, having arrows on them -- they designate relay housed switches with a "k" + the number, others are designated by the word "MICRO"-- Yes-- the pos. of the rectifier was "grounded"-- I think--look at the schematic--it should tell you. Ron Rich |
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