tips for battery replacement for the asr11 mssr

D.Waugh AJW-1471

Airport Radar Systems 9/16/16

Tips for Battery Replacement for the ASR-11 MSSR (808136/005/xxx)

Replacement of the coin type battery located on the Plot Extractor card is a required 5 year preventative

maintenance item. The battery is a lithium coin cell model BR2330, NSN 6135-01-508-3784. The battery

replacement should be performed one channel at a time. Do NOT replace both channels’ battery at the same

time. Use ESD precautions ( ESD wrist bands etc.) when working with the circuit boards. Make sure that the site

TMC files are current and available on the CMS system.

Recommended steps:

1) Coordinate with ATC for downtime.

2) Place the target channel into Maintenance Mode and then power off the unit.

3) Loosen the 4 captive screws on the Plot Extractor card set and remove the ribbon cable.

4) Remove the Plot Extractor card set using the tabs at the board edge. Place the cards on an ESD work

surface.

5) Remove the 5 screws on the back of the card as shown in Figure 1.

Figure 1

6) Turn the cards over and fully loosen the 2 captive screws shown in Figure 2.

D.Waugh AJW-1471


Figure 2. Top Screw Locations

7) Separate the 2 boards by gently using even pressure on both sides of the connector. Be careful not to lose

the 2 spacers that may drop out during separation. See Figures 3 and 4.

Caution: Improper separation of this connection can cause damage and render the PEC inoperable.

Figure 3. Host and daughter card connector

D.Waugh AJW-1471


Figure 4. Card spacers

8) With the Plot Extractor and daughter card separated, locate the coin battery on the Plot Extractor card

and replace with the new one.

9) Align the connector of the host and daughter card shown in Figure 5. Wait to fully press the connector

together until the spacers have been inserted between the cards.

Figure 5. Daughter card and host board connector

Note: When reassembling the host and daughter card, ensure that the connectors are accurately

aligned otherwise the connectors may be damaged.

D.Waugh AJW-1471


10) Insert the spacers into the top and bottom edges of the cards. One of spacers is shown In Figure 6. Then

fully press the connector together as shown in Figure 5.

Figure 6. PEC Spacers

11) Fully tighten the 2 captive screws shown in Figure 7.

Figure 7. Top PEC Screw Locations

12) Insert and tighten the 5 screws on the back of the PEC as shown in Figure 1.

D.Waugh AJW-1471


13) Reinsert the card, tighten the 4 screws and reattach the previously removed cable. Note that it can take

considerable pressure to fully seat the card assembly.

14) Power ON the channel.

15) Observe the LEDs on the front of the Plot Extractor. The “R” light should turn ON. The “B” light should

turn on briefly, turn off and then turn on again for an extended period. While the “B” light is on, this

indicates that the board is performing Built-in Self Test (BIST). Normally this takes less than 5 minutes.

During this period, the channel will not communicate with the CMS. On occasion the boards will go into

an extended BIST ( more than 20 minutes ). If after 20 minutes, the “B” light has not turned off, power

cycle the channel and again wait for BIST to complete.

16) After the battery has been replaced, the Plot Extractor card has lost its node ID and is now running with a

default node ID of 3. The normal dual channel CMS screen will show the channel “greyed out”.

17) When the channel is running under Node ID 3, the “SINGLE” icon in the upper left corner of the CMS

screen will illuminate. The “SINGLE” icon will be yellow if the channel is establishing communication with

the CMS and orange if communication is established and the channel in maintenance. See Figure 8.

Figure 8 Channel with node ID 3

18) Click on the “SINGLE” icon to go to single channel mode. When in single channel mode, log on as a

maintainer. Note the channel icon will always indicate channel A.

19) Click on the computer icon labeled Remote Link. Select Set Remote Node ID. See Figure 9.

D.Waugh AJW-1471


Figure 9 Select Remote Node ID

20) A window should open to allow setting of the node ID. Enter 1 for channel A or 9 for channel B. Click OK.

See Figure 10.

Figure 10 Setting node ID

D.Waugh AJW-1471


21) After setting the node ID, the single channel icon will “grey out” and the channel should now show in the

normal dual channel screen. Click on the dual channel icon at the upper left of the CMS screen to return

to the normal dual channel CMS screen.

22) On the dual channel screen, log on as a Maintainer.

23) The site TMC files need to be downloaded in order to setup the correct configuration. Enter Transparent

Mode with the input set to FILE. A file dialog box will open to select the file to download. Select the

necessary file and click OK. The files must be downloaded in the following order: xxxx_COM, xxxx_CHA

(or xxxx_CHB if restoring channel B) and then the reflector file xxxx_REF. Note that some older sites may

have the “common” file named as xxxx_DEF. You will have to exit Transparent Mode and reenter for

each TMC file to download. It is normal to see various test points setting and clearing faults while

reloading the configuration.

24) After downloading the required TMC files, power cycle the channel.

tips for battery replacement for the asr11 mssr

Documents