5-2 Verification Procedures and Maintenance
297-2041-900 Standard 02.01 October 1991
Polarity Check
The M5212 ACD set is polarity sensitive. If problems occur when the set is
put into service, take the following actions:
Procedure 5-1xxx
Polarity check
Step
Action
1
Go off hook, either by lifting the handset or pressing a DN key. If the
set does not respond (no dial tone) after 20 seconds, check the
polarity of the tip and ring leads (tip +, ring -). Return to hook.
2
Reverse the leads. Go off hook again. If tip and ring lead reversal
does not solve the problem, restore tip and ring to their original polarity
and change the set.
This test must be performed on the set whenever there is an AC power
failure, and the set reverts to POTS mode. There is an internal loop power
bridging CKT which may make the set appear to function even with
reversed polarity.
Station Ringer Test
The Station Ringer Test (SRT) tests the hardware of the M5212 ACD set,
and can be performed by either the installer or the repair technician at the
site without involving CO personnel.
Test Set-up
To prepare the set for the Station Ringer Test, perform the following
preparatory step.
Procedure 5-2xxx
Station ringer test setup
Step
Action
1
With the handset on hook and all LCD indicators off, press the
secondary directory number key and dial the 3- to 14-digit access
code.
The access code consists of a one to seven digit number which is assigned
by the telephone company according to local preferences, followed by the
last two to seven digits of the prime DN assigned to the telephone to be
tested. In North America, the access code usually consists of the number 57,
followed by the last five digits of the prime DN. If the required digits are
dialed incorrectly, a REORDER tone will sound. It will then be necessary to
press the RELEASE key and start again. If all digits are correct, all the
LCD indicators, except the one associated with key 12 (MUTE), will light
up and the dialed digits will be cleared from the display.
