wurlitzer 2810 selector problem

all letter keys when selected for #1 pin gives #3 pin. all numbers 1-5, 6-0 are exactly off by 2. i.e. 1=3 2=4 3=5 4=6 etc. all letter keys function except G. NO adjustments made due to the fact i am somewhat confused on manual . manual covers 2800 series but pin assembly is 2810. not the same adjustments as 2800 . i have pin assembly off mech just to test pin correctness function first before going to next problem. any help would be great....

James,
By any chance, did you just acquire this phono ?
Ron Rich

got it 3 wks ago.

James, are you sure that the plugs from the keyboard are in the right sockets?

Also, make sure that the two driver solenoids are operating and manually pull-in on each plunger to see if it has free travel.

Rob/NYC

all plugs are marked and rechecked.....it was suggested that i change the caps in the pin assembly....then retest, not sure about this...no adjustments have been made as i really am not certain just how the pin assembly works.the 2810 only has coils and 2 solenoids ,no geared parts. unlike the 2800.

after reading the manual it showes the stepper plug socket #4 must have pins 6,7,8 jumpered if no stepper present. i do not have a stepper and do not find any stepper plug socket on electrical selector assembly. rotating plate and rocker arm adjustment (pg 12 step f in service manual edited by David Dryden) in normal rest position check with manual.

i have found the stepper plug finally. as i understand it the RH and LH sol are energized in steps for number pins 1,6 2,7 (LH SOL) ; 4,9 5,0 (RH SOL) at rest (NOT ENERGIZED) 3,8 . all for letter key selections. I do not understand how the travel of each sol (RH<LH) is controlled. Are the caps determing this movement when working with the NUMBER KEYS ? The LETTER KEYS work each LETTER sol correctly.

does the cornell doubler cap 124.149 mfd control the travel of the RH and LH sol ?

James,
I dono--as I don't have a schematic--however, if still the C-D brand cap, it (along with all other "original" caps) SHOULD be changed, as I don't think that brand has been made in 40 + years ?? Ron Rich

cornell doubler caps are still made by cornell doubler co. I contacted them and was able to order the exact caps for replacement. should get them in a week. let you know what happens....

Kool--I (obviously) did not know that--please add that contact info above in the sticky, or PM me with it, and I'll add it !
Ron Rich

my source for CD caps



5726 Marlin Road, Suite 210
Chattanooga, TN 37411
423-894-2219 - Chattanooga
919-830-7409 - Raleigh
EDIT, by Ron Rich
These phone numbers are for local distributors. I spoke to a nice lady in Raleigh (other number was not answered ?), who told me that they would NOT sell outside their authorized area. To find the local distrib. in your area, go to CDE.com (I also realized why I thought they were out of business--they formerly put their full name on their products, but change that many years ago to "CDE").

i have found out how the selector network now works. the LH and RH sol under the junction box have their travel controlled by a RC network and a DIODE stack. voltage drop across the selected diodes PLUS the caps result in a controlled travel to place the correct pin selection inline with the selected LETTER coil. the caps are critical for correct function. This design was dropped later as it was to uncertain after caps age and change values.

James, you are getting "warm" -but have over-theorized here (IMO).

The use of a timing capacitor is to delay the w-i punch based on the maximum travel of either solenoid.

I the 200 design the rocker plate gets engaged by a group solenoid and the whole thing gets dragged to a stop which correctly indexes the correct rocker-hammer at the desired pin. In the 200 the group solenoids have limited degrees of travel and the whole assembly always stops at the same point. Therefore it is simple to mount a switch there to initiate the w-i pulse.

In the solenoid version such a switch was not practical because the involved components would all have different lengths of travel. So an arbitrary timing delay was used which -assumes- a maximum solenoid stroke -plus a little extra to allow for component aging and voltage variation.

An other point to bear in-mind when looking at something like this; the source voltage that charges the timing cap is not regulated so it can not be relied-on for an accurate time-constant. The timing cap charge will vary based on what voltage is coming into the machine.

The cap IS important for the delay, but if you have inaccurate selections that are always at the same points, I'd first look for mechanical binds.

From what I remember of this type of arrangement, after the second button is pressed you'll hear a "clack" & hum for approx ½ second followed by a quick snap (the w-i hammer).

One other point; make sure that the carousel is coupled to the crank-arm shaft.. If the carousel was forced at some point it can snap out of the catch under it which locks it to the shaft. try to turn the crank in both directions. If properly locked it will not turn in reverse as the carousel will be stopped by the backstop pawls.

Rob

thank you for a very clear explanation, i have looked for a long time for this. i guess i over think at times....