jcox@x102a.harris-atd.com (Jamie Cox) (08/26/90)
This seems like an easy question for comp.dcom.telecom:
I have an old desk top dial phone which works but does not ring. I
would like it to ring. It is a model 500. The wires from the ringer
solenoid have been disconnected. Where should they go? I have the
original connections written down and tried that, but it still didn't
ring.
The ringer solenoid has four wires, red, white, red/white and black
(or maybe it used to be green, it's hard to tell:-)). I have measured
the resistance among these and its like this:
Red R/W Blk White
| | | |
\/\/\/\/\/\/ \/\/\/\/\/\/
~ 3k ohms ~ 1k ohms
There was no connection between the two sides of the above diagram.
Question number 1: Is the ringer solenoid broken?
Question number 2: Please post or email information about likely
wiring diagrams. The network is labeled with letters: GN, B, R, RR,
F, K, G, L1, L2, A. Apparently some phones use numbers instead, and I
already have a diagram for such a phone which doesn't help much.
I have seen several different connection patterns in similar phones
and have tried them on this phone, but still no ring. Wow, there are
a lot of (apparently valid) ways to hook up a ringer. The phone in
question is known to have rung when in service about seven years ago.
It was on a different exchange, and I remember it had a distinctive
ring back when called, and perhaps an unusual audible ring from the
instrument. It may have been on a party line at one time.
Thank you.
Jamie Cox jcox@mlb.ess.harris.com | Phone: (407)-727-6397 (work)
Harris Government Aerospace Systems,| (407)-723-7935 (home)
MS 19/4827, P.O. Box 94000, |
Melbourne, Florida USA | "Barton F. Bruce" <BRUCE@ccavax.camb.com> (08/31/90)
In article <11346@accuvax.nwu.edu>, jcox@x102a.harris-atd.com (Jamie Cox) writes: > I have an old desk top dial phone which works but does not ring. I > The ringer solenoid has four wires, red, white, red/white and black > > Red R/W Blk White > | | | | > \/\/\/\/\/\/ \/\/\/\/\/\/ > ~ 3k ohms ~ 1k ohms The BLACK and RED go to tip and ring (the green + red line cord wires) probably on (L2) and (L1). Polarity only matters if you get tappity-tapping from an extension rotary dialing or going on/off hook. There are also mechanical adjustments to eliminate tapping. The SLATE (white) and RED/SLATE go to (A) and (K) that are the 2 ends of a 1/2 mfd cap to block talk battery from the ringer coils. There is a lot of history behind those two different size windings, but the simple description is that they provided a second party id by connecting one of them between ground and the electrical midpoint of the transmission network (B) when a second party phone went off hook. The CO could determine which subscriber went off hook - the one with or the one without the connection to ground.