Removing The A2 Motherboard Assembly; Reassembling The Card Cage And Its Assemblies; Assembly Replacement; A2 Motherboard Removal - HP 8133A Service Manual

Removing the A2 Motherboard assembly

Reassembling the card cage and its assemblies

Assembly replacement

nects t o channel
assembly in 002
003
and options
c nnects to channel 1
assembly in all
instruments
Figure 5-16.
1. The A2 assembly is the motherboard for the card cage assemblies.
All of the card cage assemblies must be removed to access the A2
motherboard.
2. Remove screws 1 to 6, shown in Figure 5-16.
3. The A2 motherboard can then be freed of the through wall
connector, Figure 5-16,
Reassembly is basically the reverse of disassembly, but there are some
details to be careful of.
1. Replace the A5 timing assembly first. Replace it from the left of
the card cage into its original position at the bottom, being careful
not to catch the front and rear semi-rigid cables on anything.
2. Locate the guide pin on the left edge of the A5 timing assembly
into its locator groove on the inside left wall of the card cage.
3. When the assembly is located correctly, slide it forward until the
front right corner of the assembly locates into the board holder
brackets in the front right corner of the card cage.
Make sure that the assembly connector pins locate fully into the A2
4.
motherboard housing when replacing assemblies.
5. Carefully tighten the two SMA connector nuts onto the relay box
studs by hand, then with the type C 7.9mm torque wrench.
overtighten these nuts.
2
_ -
(cut away)

A2 motherboard removal

to the A12 motherboard and lifted out.
Replacing Assemblies 5-13
of
A12
Motherboard
Do not