A8 Hp-Ib Board Removal; A3 Front-Panel Board Removal; A1 Main Board Removal - HP 6033A series Service Manual

When installing the A4 power mesh board, lower it into its connectors and press in place.

A8 HP-IB Board Removal

Remove the A8 board as follows:
a. Remove the two screws (Pozidriv, M3x.5) which attach the A8 HP-IB board to the rear panel. Remove the single screw
(Pozidriv, M4x.7) that secures the HP-IB board to the side frame near the front corner.
b. After removing the inside cover, unplug the W5 and W6 ribbon cables at the top edge of the A8 board, the W2 3-wire
cable from connector A8J10 and the W1 ribbon cable from connector A8J9.
c. Remove the A8 board lifting it straight up.
Install the A8 board by reversing the above steps. Lower the rear side of the board into the unit first and fit the bottom tabs
into their mating slots.

A3 Front-Panel Board Removal

Remove the A3 front-panel board by first removing the entire front panel assembly. You do not need to remove the top
cover. Follow this procedure:
a. Remove the top plastic insert by prying up with a flat-blade screwdriver.
b. Remove the four front-panel assembly mounting screws on the top and bottom at the corners.
c. Gently pull the front-panel assembly away from the unit as far as permitted by the connecting cables.
d. Remove the ground-wire screw (Pozidriv, M4x.7) holding the green-yellow ground wire.
e. Note the locations of the four power-wire connections to the power switch and then unplug the quick-connect plugs.
f. Unplug the W3 3-wire cable from connector A1J3 to the A1 main board, and unplug the W1 ribbon cable from
connector A8J1 on the A8 HP-IB board.
g. Remove the A3 board from the front-panel assembly by removing the five mounting screws (Pozidriv, M4x.7).
Install the A3 Board by reversing the above steps. Connect the power switch wires in the exact locations from which they
were removed.

A1 Main Board Removal

Removing the A1 main board requires removing the rear-panel, all boards except the A3 front-panel board, and 17 A1
board mounting screws, two standoffs, and and interface bracket. Component-access cutouts in the bottom inside cover
allow unsoldering most A1-board components for repair without removing the A1 board.
Proceed as follows:
a. Remove the A2, A4, and A8 boards according to the above instructions.
b. Detach the rear panel by removing the four mounting screws (Pozidriv, M4x.7)-two on each side. Gently pull the rear
panel away from the unit as far as permitted by the four wires connected to the A1 board.
c. Remove the A8 bracket by removing three screws (Pozidriv, M4x.7) - two on bracket, one on side of the unit.
d. Unplug the W2 3-wire ribbon cable from connector A1J2, and unplug the W3 3-wire cable from connector A1J3.
e. Remove the A1 board by removing the 17 mounting screws (Pozidriv, M4x.7).
f. Note locations and then unplug the two ac power wires and the two fan wires to the A1 board.
Install the A1 board by reversing the above steps. Plug the two ac-power wires onto the two spade terminals in the left-rear
corner of the A1 board. Use the table below to choose the correct terminal for each wire.
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