1.3 - Connect 1A2 Phone Extensions
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1.4 - Attaching A Ring Generator (If You Have One)
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This switch arrangement is the same for both SW1 (Buzz Call) and SW2 (Bell Call).
Any switch that is "OFF" causes the line/extension combo to not ring.
So if you only want Line #1 to ring all extensions, only turn on switches 1, 3, 5, 7.
1.6 - Testing Your Setup For The First Time
2.0 - Using Your 1A2 Multiline Phone System
3.0 - Phone System Accessories
5.1 - PROBLEM: Can't dial with Touch-Tone.
5.2 - PROBLEM: Can't use Rotary to dial extensions on the intercom line
5.3 - PROBLEM: Line #1 works, but Line #2 does not
5.4 - PROBLEM: Picking up a line lights lamps but gives no dial tone
5.5 - PROBLEM: Lamps don't light when picking up a line
5.7 - PROBLEM: Buzz-ringing not working.
In the v1.5b firmware, the line lamp comes on during pickup whether the line is alive or not.
This is so that pressing RECALL (for phones that have this feature) or use rotary dialing doesn't
flash the line lamp.
But if the line is inactive, the line can't go into Hold because there's no line current.
Normally the A lead (e.g. Pin 27 for Line 1) is connected to ground (Pin 2) when a line is picked up;
switch closures inside the phone connect the A lead to ground in the off-hook state. When you press Hold,
that opens the A lead causing a Hold condition. If the A lead isn't working at all, picking up a line
simulates going directly into Hold, as if someone immediately pressed the Hold button.
NOTE: A problem with pin 2 (common ground for all A leads) can affect ALL lines. So if all lines go into Hold
on pickup, focus on pin 2 (O-W wire).
Check the A lead circuit in the phone; using a test meter in continuity mode, test the amphenol connector
across pin 2 (ground) and pin 27 (A lead for Line 1). It should tone when Line 1 is picked up, and stop tone
when pressing down Hold or on hangup.
If the A lead doesn't close during pickup, that's the problem to solve. Using the BSP for your phone model,
check the wiring of Pin 27 (W-O wire) through the switch contacts of the hook switch, hold button, and line button
to Pin 2 (O-W wire) against the wiring inside the phone.
Possible problems: Amphenol connector contacts corroded, broken wire somewhere in the connector or phone
for any signals involving the A lead (Pin 27 + 2 for Line 1, Pin 30 and 2 for Line 2, etc), switch contacts
for the phone's Hold button, Hook Switch, or Line Buttons not making proper contact, miswiring inside phone,
miswiring of a 66 block between phone and KSU, if any.
If the A lead seems to work when testing the phone's connector, check any wiring between phone and KSU,
such as 66 blocks, 66E3 devices, etc. Focus on pins 2 and 27 (O-W pair) if Line 1 has the problem.