AT&T Merlin 820 Service And Maintenance Manual page 32

Basic Trouble Tests
Make sure the voice terminal power supply is properly connected to the
Step 3.
103A Modular Jack (it can also be connected to a terminal extension cord)
and that power is being supplied from the ac outlet for the voice terminal
power supply. Use a lamp, radio, or similar device to check the ac outlet
(see Figure 9).
34–BUTTON DELUXE
VOICE TERMINAL
Figure 9—Voice Terminal Power Supply Connections
Step 4. Disconnect the power supply from the ac outlet.
Disconnect the Z400F Adapter from the 103A Modular Jack.
Step 5.
Page 28
MODULAR
TERMINAL
CORD (D8W)
CORD
(D6AP)
AC
OUTLET
POWER SUPPLY
(KS–22911, L11)
MODULAR
JACK (103A)
ADAPTER
(Z400F)
TO CONTROL
UNIT
EXTENSION CORD
(D8AF)