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#1
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Rock-Ola 454 write-in problems
Hello!
I recently bought a rock-ola 454 (I already have one 454, this is a second, in way better cosmetic condition)... I've been tinkering with it, and wanted some advice on a couple issues. First, when I got the machine, it wouldn't write in. It would just scan and scan and scan. If you flipped a pin, the read-out carriage would rotate, find it, and start playing the record, and the amp works fine on it, but it wouldn't write-in. As a matter of fact, even with the pin tripped the write-in would keep scanning, even while the record started playing (which I guess is normal). So, I mess around with it a little bit, which is pretty easy to do, since I have again another 454 in the house! I eventually tried switching the two red 1300 series relays (write-in relay, and stop relay) from my working machine, to my project machine, and partially fixed the problem. It's working sporadically now... some times when you select, it immediately launches the write-in carriage, and it will select and engage the pin, triggering the read-out, etc. everything works great. Sometimes, however, when you select, it 'hangs' on the third number. Basically the write-in carriage doesn't start turning, and the selector stays engaged. It's sporadic, though. I'm thinking that this is possibly something in the selector assembly? I haven't cleaned it yet. I lightly cleaned the wiper boards on the pin bank in the bottom, but havne't touched the selector assembly. Am I on the right track here? Is there something else I should be looking at? Any help would be greatly appreciated... and if anyone has two 1300 series red relays they'd like to sell, I'd be interested in that, as well. Thanks, Ron |
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#2
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I generally have found that the write in slip rings AND the write in
carriage wiper fingers need a good cleaning. You have to remove those units to do the job properly. Sometimes I've had to take the plug-in red and white relays apart to clean/file the contacts. |
#3
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First, when I got the machine, it wouldn't write in. It would just scan
and scan and scan. If you flipped a pin, the read-out carriage would rotate, find it, and start playing the record, and the amp works fine on it, but it wouldn't write-in. As a matter of fact, even with the pin tripped the write-in would keep scanning, even while the record started playing (which I guess is normal). No, this is not normal. When the record is playing, the write-in should be idle. Sometimes, however, when you select, it 'hangs' on the third number. Basically the write-in carriage doesn't start turning, and the selector stays engaged. It's sporadic, though. I've had the same problem on my 454 before. Clean the write-in fingers and contacts thoroughly. That seem to be the main cause for the problem (for mine at least, anyways). Rubbing alcohol can clean it pretty good. Bill |
#4
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It's OK for write -in to run when a record is playing, that's how you
make the next selection. AS mentioned give the slip ring assembly a good cleaning. If your fingers are nimble, you do not have to remove anything. First clean with alcohol. Then take a synthetic scrub pad or a piece of light emory paper and clean the rings and rivet heads. Flip the emory paper over so the rough side is to the left. Run the wiper arm over the paper, you can move this arm by hand. Clean with alcohol again. Give a light spray of WD-40 onto the assembly and spin the arms around a couple of times, this cuts the friction. Next look at the large Molex plug that comes off the pin bank. Spray that with WD-40 or contact cleaner.. Don't forget the little piggyback one.. AS for third digit hanging up. If keyboard reset button will release it, prblemis with latch/lockbar switches under keybank. If not, problem is in red relays or ADR relay in credit unit or there maybe too much friction for the motor to turn the arm.. I have good used relays, but unless they are really pitted, they can be cleaned up. Charlie |
#5
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Hi Charlie;
Yes, I assumed it was alright for the write-in to run with the record playing, if you're selecting more songs, thanks for confirming that. The reset button does reset it, on the third one. In my opinion, what's happening is, when you depress a button, it may not send the signal that the button was depressed, but the switch on the end of the selector is opened, turning on the 'first digit' light and moving you on to the second button press... so when you press the third button, it holds in, because the switch has been opened three times, but it hasn't sent three signals and thus can't tell the write in arm where to go! Some of the buttons must not be making good contact. I'm still looking for my manual on how to take the selector assembly apart, I'll let everybody know what happens. I'll try cleaning the relays, too... thanks guys! Ron "CHARLIE MAIER" wrote in message oups.com... It's OK for write -in to run when a record is playing, that's how you make the next selection. AS mentioned give the slip ring assembly a good cleaning. If your fingers are nimble, you do not have to remove anything. First clean with alcohol. Then take a synthetic scrub pad or a piece of light emory paper and clean the rings and rivet heads. Flip the emory paper over so the rough side is to the left. Run the wiper arm over the paper, you can move this arm by hand. Clean with alcohol again. Give a light spray of WD-40 onto the assembly and spin the arms around a couple of times, this cuts the friction. Next look at the large Molex plug that comes off the pin bank. Spray that with WD-40 or contact cleaner.. Don't forget the little piggyback one.. AS for third digit hanging up. If keyboard reset button will release it, prblemis with latch/lockbar switches under keybank. If not, problem is in red relays or ADR relay in credit unit or there maybe too much friction for the motor to turn the arm.. I have good used relays, but unless they are really pitted, they can be cleaned up. Charlie |
#6
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You are off theory about the signals. First and second digits turn on
SCRs. Third digit is direct wire to pin bank, Again the way it works is when the third digit latches it closes the locbar/latch switces. This causes the write in relay to energize. This starts the motor. If the reset at the keyboard releases the latched down button, then the write in relay has not energized. Your problem is with dirty or mispadjusted lockbar/latch switches or in the wiring harness. Not in the keyboard slide switches. Get out a burnishing tool and clean and gap them. Charlie |
#7
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Yes, I assumed it was alright for the write-in to run with the record
playing, if you're selecting more songs, thanks for confirming that. My misunderstanding. I thought you were saying that it is constantly running even if a record is not being selected. That's a whoopsies! Bill |
#8
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Thanks for explaining that more, Charlie... that's what I get for trying to
guess how they work! I looked around and found my manual, and looked through it so it would make more sense. I'll try those switches and let everyone know what happens. Ron "CHARLIE MAIER" wrote in message oups.com... You are off theory about the signals. First and second digits turn on SCRs. Third digit is direct wire to pin bank, Again the way it works is when the third digit latches it closes the locbar/latch switces. This causes the write in relay to energize. This starts the motor. If the reset at the keyboard releases the latched down button, then the write in relay has not energized. Your problem is with dirty or mispadjusted lockbar/latch switches or in the wiring harness. Not in the keyboard slide switches. Get out a burnishing tool and clean and gap them. Charlie |
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