User Manual

AS4000 Operations and Maintenance

Section

605-0000-431

. Issue 1.6. Date3/2/99

DLP-022

Page 51 of 60 © Copyright Airspan Communications Corporation 1999

CHANGING THE TYPE 2 PSU

The Type 2 PSU (ACPSU) consists of an AC PSU Unit with standby batteries and

generates power fail alarms that are passed to the CT.

Tools and equipment needed

ITEM DESCRIPTION SIZE

01 Snake Eye Screwdriver

02 Screwdriver Pozidrive No 1 x 75mm

03 Screwdriver Pozidrive No 2 x 199mm

04 Screwdriver Pozidrive No 3 x 150mm

05 Screwdriver Flat Blade 3mm x 100mm

06 Digital Multimeter Fluke 77 or similar

07 Test Telephone

STEP PROCEDURE

1. Unplug the PSU from the AC supply.

2. Unscrew and remove the PSU front cover using a Snake-eye screwdriver.

3. Disconnect the drop cable and the NTU wiring.

4. Remove the faulty PSU by unscrewing the No 8 x 50mm screws that secure the unit to the

wall.

5. Secure the new PSU squarely in position using the No 8 x 50mm screws (Part No 174-

0815-002) and cup washers (Part No 192-0080-230) previously securing the faulty power

unit.

6. Reconnect the drop cable and NTU wiring to the blocks TB1 and TB2. For connector

detail see DLP-024 (Replacing the drop cable)

7. Plug the AC supply cord into the IEC connector on the PSU and secure with retaining

clip.

8. Connect the batteries to the PSU. Care should be taken when handling lead acid batteries

to avoid dropping or short circuiting them. Disposal should be in line with local codes.

Batteries may explode if put into a fire. Install the batteries in the PSU first, then connect

them taking care to observe correct polarity. Connect the blue lead first to connect them

together, then connect the red lead to the +ve terminal and the black lead to the -ve

terminal.