REMOVE/REPLACE MOTHER BOARD

REMOVE/REPLACE INPUT/OUTPUT BOARD

REMOVE/REPLACE CIRCUIT BOARDS Al THRU A8

TM-11-7025-234-23 Modem Unit MD-1149/MYQ-4A Manual
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TM 11-7025-234-23

4-17. REMOVE/REPLACE MOTHER BOARD

INITIAL SETUP

Materials/Spare Parts

Common Tools

q Antistatic plastic bags

q Tool kit

Paper

q Pen or pencil

Remove

1. Access modem (para 4-11).

2. Remove circuit boards, Al thru A8

(para 4-18, Remove step 2).

3* Remove power supply assembly (para

4-12, Remove steps 2-7).

4. Remove input/output board (A9) (para

4-16, Remove steps 2-4).

5. Remove rate/mode display board (para

4-15, Remove steps 3-5).

Lift mother board

6. Remove screws.

from chassis.

7. Note jumper settings.

Replace

1. Using your notes, set jumpers.

2. Set mother board in chassis and

replace screws.

3. Replace rate/mode display board

(para 4-15, Replace steps 1-3).

4. Replace input/output board,(para

4-16, Replace steps 1-3).

5. Replace power supply assembly (para

4-12, Replace steps 1-5).

6. Replace circuit boards in their

respective positions (para 4-18).

4-18

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