INTRODUCTION
I-E96-417A
4 - 1
SECTION 4 - REPAIR/REPLACEMENT PROCEDURES
INTRODUCTION
Repair procedures are limited to termination unit replacement.
If the NTCU01 Serial Interface Termination Unit fails, remove it
and replace it with another one.
TERMINATION UNIT REPLACEMENT
If you determine that the serial interface termination unit
(TCU) is faulty, replace it with a new one.
Do not
try to repair
the module; replacing components may affect the module per-
formance and certification.
Follow Steps 1 through 8 to replace the TCU termination unit.
NOTE: Power to the computer, modem or diagnostic terminal
should be OFF before removing the RS-232-C cable.
1. Disconnect the RS-232-C cable from the termination unit.
2. Disconnect the termination unit cable from the P1 socket
on the termination unit.
3. Remove and save the chassis ground screw (with star
washer) and the two mounting screws that secure the termina-
tion unit to the field termination panel.
4. Remove the faulty termination unit.
5. Insert the tabs of the replacement termination unit into the
same slots of the termination panel standoff as shown in Fig-
ure
and slide the circuit board into position.
6. Secure the termination unit circuit board to the field termi-
nation panel with the two mounting screws and chassis
ground screw (with star washer) saved from Step 3.
7. Connect the termination unit cable and the RS-232-C cable
to the TCU circuit board.
8. Turn on power to the computer, modem or diagnostic
terminal.
