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- FONE2.DOC Hand-phone wiring connections.
- 5/26/87
-
- (When trouble-shooting your handphone, or swapping its components, the
- following information may prove useful. Downloaded from the AIMS RCP/M,
- this file was originally named FONE. I have reformatted it slightly.
- --Roy Lipscomb)
- -------------------------------------------------------------------------
-
- Date: 14 May 85 16:04:49 EDT
- From: *Hobbit* <AWalker@RUTGERS.ARPA>
- Subject: Wiring
- To: Telecom@RUTGERS.ARPA
-
- It's rather difficult to send out schematic diagrams to a network of
- people using regular old ascii terminals, but since wiring inside most
- fones is pretty standard, a description should do the trick. This
- applies to *all* WE phones and ITT phones that use the standard
- dial/ringer/network block/handset configuration. I've rebuilt lots
- of these suckers, and can confidently say that they're all the same.
-
- Everything basically talks to the network block. The network block
- contains the ringer capacitor, the induction coil that handles the
- handset, and very little else save some spare screw terminals. Left
- to itself, the network block can function as a standard line load [it
- looks electrically like a phone] when a line is connected across RR
- and C. These are the inputs to the coil. The ringing capacitor is
- indeed across A and K as someone mentioned. In addition, older blocks
- have a smaller capacitor across F and RR, to decrease sparking across
- rotary dial contacts.
-
- HANDSET:
- Green and White: Earpiece leads. These connect to net R and GN
- respectively.
- Black and Red: Mike leads. Connect to net B and R respectively.
-
- RINGER [TWO-WINDING]:
- Black and Red: To line. Connect to L1 and L2 [or wherever your line
- comes in].
- Grey and Grey/red [these may vary; they are the ''other two'' wires,
- anyway]: Connect to net A and K. The circuit thus
- formed runs from one side of the line to one ringer
- winding, thru the A-K cap, thru the other ringer
- winding, to the other side of the line. This
- configuration has infinite DC resistance, but picks
- up the AC ring voltage.
-
- RINGER [ONE-WINDING, rare]: Connect the single winding [two wired] in series
- with the A-K capacitor somehow, and this whole thing across the line
- as above.
-
- ROTARY DIAL:
- Blue and Green: Interruptor. Connect to net F and RR.
- White [2]: Earpiece suppress. Connect to net B and GN if desired.
-
- TOUCH-TONE DIAL:
- Green: + Line in. Connect to net F.
- Black: + Line out. Connect to net RR.
- Org/Blk: - Line in. Connect to net C.
- Red/Grn: Output common. Connect to net R.
- Blue: Output. Connect to net B.
-
- ------------------------------------------------------------------------------
- *Note: the above 5 connections will give you a "bare-bones" dial
- configuration without features. Features are mike disconnect, earpiece
- suppress, etc., which are done simply by routing leads to these through the
- extra contacts on the dial instead of directly. If you want the features,
- modify the wiring as follows. If your network block doesn't have the S and
- T terminals, you have an old one designed for rotary dials, and you'll have to
- do kludges.
-
- EARPIECE MUTE:
- Move Handset lead at White to net S. Also connect Dial White-Blue to net S.
- Connect Dial White to net GN. This routes the earpiece through the dial
- switching mechanism, which resistifies the circuit on button press.
-
- MIKE DISABLE:
- Move Handset Red to T. Also connect Dial Red to T. This completely disables
- the mike on button press. Make sure Dial Red-Green is connected to R if you
- [more]
-
- do this mod!
- ------------------------------------------------------------------------------
-
- HOOKSWITCH:
- You'll find many variants of this in different units; some configurations
- switch both sides of the line, some only one, some switch out the ringer
- when off-hook [which isn't necessary, really]. The following should work:
- Yellow: Connect to net L2. This is where the line enters.
- Brown: Connect to net C.
- Green: Connect to net L1. This is the other side of the line.
- White: Connect to F. This is switched line power to the dial and the
- rest.
- Red: Connect to R. This, with Black, is shorting earpiece mute.
- Black: Connect to GN.
-
- LINE IN:
- Green and Red connect to L1 and L2. Try one polarity; if the touchtone
- dial doesn't work, then flip them. Rotary dials, of course, don't
- matter.
- [end]
- ke sure Dial Red-Green is connected to R if you
- [more]
-
- do this mod!
- ------------------------------------------------------------------------------
-
- HOOKSWITCH:
- You'll find many variants of this in different units; some configurations
- switch both sides of the line, some only one, some switch out the ringer
- when off-hook [which isn't necessary, really]. The following should work:
- Yellow: Connect to net L2. This is where the line enters.
- Brown: Connect to net C.
- Green: Connect