435 Princess deluxe issues

[Ron Rich]

Pete,
Once again--
HOW, are you "checking" contact continuity ??
Ron Rich

[prime]

What i did was set meter to DC ,put red leg on left side of coil, black to ground, got -30 vdc, tried the other side -30vdc, then went back to first leg with power on and meter connected showing -30vdc i closed the switch with a pencil , coil operated and voltage went to zero. I believe the coil is good and the switch is good, some other switch or unit is causing the issue. when i use selection and the write in stops to push pin, the switch closes as it should but the coil no longer works. pete

[jukenorman]

Hi Ron,

I'm now starting to have some doubts! Let's leave it at that and next time I have one of these Rock-Olas, I'll look into it further. On another thought, maybe the wiper block on the write-in arm has somehow been dislodged a bit?

Edit - Actually I have come to the conclusion that Ron is correct - the write in arm is operated totally independently and the adjustment only affects the position of the wiper contacts relative to the track and rivets on the selection drum.  I don't know what I was thinking or not thinking more like!

Norman.

[prime]

I feel whatever is causing the electrical issue is also affecting the write in, sometimes it stops exactly above the number pressed but because its vibrating it moves backwards, If the hammer had full power i believe it may work . So my focus now is why am i only having issues when selecting and using the write in. Like i said all works great when working around it. pete

[prime]

I had an idea that i thought may be sound, i thought if there was a ground wire broken it may make the write in try and get ground from the ground leg of the switch that does the subtract and ADR this would affect everything in the chain. Unfortunately i ran from the ground connection on the wheel to chassis, no change, i also tried from ground wobble switch to chassis and last from the switch to chassis. no luck

[jukenorman]

Hi Pete,
I'm losing track of where you are but looking back, you have said that you are operating the K2-2 switch with a pencil and it operates the ADR relay but that doesn't happen when the accumulator reset solenoid operates K2-2 - is that correct? That to me indicates an issue with the K2-2 switch?

Norman.

[prime]

Yes if i power up and push a selection to start write in, when the arm stops at selection both switches close, the credit wheel moves one space and the ADR does nothing, if i power up and do not select i can push the switch with a pencil and the ADR moves. When i power up with selection i can push the ADR and selection releases. Im wondering could there be an issue with the hammer solenoid, I was thinking of disabling the A side, select a A7 and when the wheel stops see if the wobble and the read out solenoid are vibrating. Does this make sense to you?

[Ron Rich]

Pete,
You are cofuzzing me, again-- K-2 indicates a relay--What switch" are you speaking of--a contact blade on that relay ? If so have you closed that contact by hand ( BTW--a pencil is not a safe thing to use around live power--the "lead" conducts !--use a chopstick !), while checking it's continuity with either a good ANALOG meter, or a home built checker, a described in our FAQ's section ? Ron Rich

[prime]

The switch (K2) is the one that gives ground to the AVR I dont think there is alot of power there, i did use just the eraser. I did check it with my analog meter to see if there was a good contact without power first. I will keep in mind to check with chopstick.

[jukenorman]

Hi Pete,
It's imperative that you get the K2-2 switch to function the ADR relay - this is crucial to the write-in operation, among other things it's what ends the "fat pulse" and is no doubt the main contributor of your buzzing noise.

Instead of operating the K2-2 switch manually, operate the the accumulator reset coil (K2) armature manually. Try and replicate its electrical operation ie don't hold it made longer than necessary, just flick it enough to remove a credit. My thinking here is that the K2-2 switch is either not making or making so fleetingly that the ADR relay is not energising. The ADR relay has a 50 milli seconds delay to energise. Let us know what you find.

You must resolve this issue, as I've said - it's crucial to the write-in operation!

Norman.

[prime]

I have already operated the ADR by just touching the top, immediately the buttons release, unfortunately it stops everything, I thought the cycle would then continue but it doesn't, i made sure before i touched it that the pin was down, my thinking was once the buttons released, the read out would start ,no luck, it does stop the buzzing at the write in, read out and wobble switch. When i dont use the selector and just move the contacts at the K2-2 switch the ADR immediately moves, when i use the selector to start a record i see the K2-2 blades move and stay closed, but nothing happens to ADR.

[Ron Rich]

Pete,
We are going round and round in the same circle here-- DID you or did you NOT "check" K-2's contacts for continuity --and if so, HOW ??
Ron Rich

[prime]

I stated earlier i used an analog meter. I fluctuate to zero, i also used my fluke multimeter on continuity setting, i get a strong beep and the number drops to about 1. After reading what Norman wrote i thing whatever is supposed to make the K2-2 switch pulse may be the issue, when i start the write in and it stops at the pin the K2-2 switch engages but does not release until i either touch the ADR or turn off the unit.

[Ron Rich]

Pete,
Sorry, somehow I missed that post ? What does "fluctuate" mean in this case-- I still suspect that K-2 is your problem-- As written in the sticky "continuity", can NOT be accurately checked with most digital meters -- including my Fluke, and my HP meters --please re-read that sticky. Also, if the ADR has any NC contacts--check them ! Ron Rich

[Ron Rich]

Hi Norman,
What generates the "fat pulse" on this model-- I thought it was half of a duel cap located within the pricing unit ?
Ron Rich