To change the clock, follow the steps below for your particular Iwatsu Telecommunications system.

ZT-D

From the operator only when idle:

1. Go off-hook and press [FEAT] + [SPKR] + [3]
2. Enter the time [HH MM] using the 24 hour military clock
3. Go on-hook

ZT-S

From the Master KT only, when idle:

1. Go off-hook and press [FEAT] + [#] + [2]
2. Enter the time [HH MM] using the 24 hour military clock
3. Go on-hook

ADIX

From the Operator DSS when idle:

1. Press [ICM] + [FEAT] + [6] + [4]
2. Enter the time [HH MM] using the 24 hour military clock
3. Press [SPKR]

From the Attendant Console when idle:

1. Press [ETC] + [ETC] + [ETC] + [F1]
2. Enter the time [HH MM] using the 24 hour military clock
3. Press [RLS]

IDS-128

From Console:

1. Press [PROG] then [3] then [SET]
2. Enter the time as HH + [SP] + MM + [SP] + [*AM] or [*PM]
3. Press [SET] then [PROG]

EX-816/824/1648 - Versions 1 and 2

From the Station 20 when idle:

1. Go off-hook and press [FEAT] + [5]
2. Enter the time [HH MM] using the 24 hour military clock
3. Go on-hook

EX-816/824/1648 - Version 3 
EX-1232/2464 - Versions 1 and 2

From the Station 20 when idle:

1. Go off-hook and press [FEAT] + [8] + [1]
2. Enter the time [HH MM] using the 24 hour military clock
3. Go on-hook

TXX-616 and EX-616

From the Station 20 when idle and on-hook:

1. Press [0] + [3 digit password] + [program number 00]
2. Enter the time [HH MM] using the 24 hour military clock
3. Press [FWD] + [FLASH] + [FLASH]