8845A/8846A
Calibration Manual
2-8
6. Remove the wedges from the front and rear input modules by rotating the top toward
the chassis middle and pulling up. See Figure 4-1.
7. Remove both sets of screws holding the front panel to the chassis (8-32 pan head and
6-32 flat head undercut). See Figure 4-1.
8. Gently remove the front panel by pulling it forward and set it aside.
9. Remove the plastic handle caps from the chassis sides by rotating the front slightly
inward and pulling forward.
Main Chassis Disassembly
To disassemble the Meter’s main chassis:
1. Carefully remove the transformer connectors from the main board.
2. Carefully remove the screws that hold the transformer and its bracket to the chassis
while holding the transformer so that it cannot drop on the circuits.
3. Carefully lift the transformer out of the chassis and place the transformer behind the
instrument with the power module leads still attached.
4. Remove the jackscrews for the RS-232 and IEEE488 connectors to the chassis.
5. Remove the screws holding the main circuit board to the chassis (three 6-32 pan-head
screws).
6. Remove the main circuit board.
Front Panel Disassembly
To disassemble the Meter’s front panel:
1. Remove the one 6-32 pan head and two 6-32 flat head undercut screws holding the
display shield to the rest of the front panel assembly and remove the shield.
2. Remove the thread-forming screw holding the front panel shield to the front panel
and remove the shield.
3. Remove the three thread-forming screws from the keypad assembly and remove
display module.
Assembly Procedures
To assemble the three parts of the Meter, follow the disassembly instructions in reverse
order.
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