Al Assembly Removal; R E M O V I N G The - Agilent Technologies 4284A Service Manual

3-8-2. Al ASSEMBLY REMOVAL

1. Loosen the two screws which secure the left hand side top shield plate. D o n ' t
completely remove them.
There are two top shield plates. To gain access to the A l assembly, remove the
top shield plate which has the WARNING message printed on it.
CAPACITORS ON THE Al BOARD REMAIN CHARGED WITH HAZARDOUS VOLT-
AGES FOR A PERIOD OF TIME AFTER THE INSTRUMENT IS TURNED OFF, OR
AFTER THE POWER CABLE I S DISCONNECTED. A L L O W AT LEAST ONE
MINUTE FOR THE CAPACITORS TO DISCHARGE AFTER THE INSTRUMENT IS
TURNED OFF OR THE POWER CABLE IS DISCONNECTED.
2. Slide the top shield plate towards the front and lift it off.
3. Lift the black and the brown board extractors a t the top corners o f the A l
assembly.
4. Disconnect the cable that connects between the Al board assembly and the rear
panel.
3-8-3. REMOVING THE A2, A3, A4, A5, A6, A7, A20, A30, A31, A40, OR A50 ASSEMBLIES
1. Loosen the five screws that secure the right hand side plate. D o n ' t remove the
screws completely.
There are two top shield plates. I n order to access the A2, A3, A4, A5, A6, A7,
A20, A30, A31, A40, or A50 assemblies, remove the top shield plate on which the
WARNING message label is NOT printed.
2. Slide the top shield plate towards the front and lift it off.
3. Lift the extractors at top corners of the board assembly that you want to remove.
NOTE
WARNING
NOTE
3-17
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