AT&T Merlin 820 Service And Maintenance Manual page 87

Trouble on an Accessory
Step 9. At the control unit, unplug a modular line cord from the Tel. Co. Lines
jack and plug it into the PFTT (see Figure 43).
Figure 43—Plugging a Modular Line Cord into the PFTT
Step 10. Place a call using the PFTT.
IF
The call is completed normally,
The call cannot be completed,
Page 84
POWER FAILURE
TRANSFER
TELEPHONE CORD
Trouble found. It is the PFTT
modular line cord connected to the
Type III Cartridge. Replace the
modular line cords to their original
positions. Reconnect the control
unit power cord to the ac outlet.
Then read the Maintenance
Exchange Procedures at the end of
this manual.
Trouble found. It is the PFTT.
Replace the modular line cord to
its original position. Reconnect
the control unit power cord to the
ac outlet. Then read the Mainte-
nance Exchange Procedures at the
end of this manual.
MODULAR
NETWORK
LINE
INTERFACE
CORD
POWER FAILURE
TRANSFER
TELEPHONE
THEN