1.
Turn the test set hon its right-hand side.
2.
Use a
inch open end wrench to remove the
cables connected between couplers A7,
A9 and bulkhead connectors J2 and J5.
3.
Unplug the transformer connector mating with connector J2 on the Al5 regulator board assembly.
4.
Use a large pozi-driv screwdriver to remove the four screws and washers holding transformer
onto the rear panel.
5.
Use a large pozi-driv screwdriver to remove the one screw holding the transformer angle bracket to
the main deck. Carefully remove the transformer from the test set and put it on the bench close to
the test set. The transformer wires soldered to the FL1 line module are short, so do not pull on the
transformer too much.
6. Strip the heat shrink tubing off of the two fan wires and unsolder them from line module
Use
wire cutters to cut any cable ties holding the fan wires to nearby cables.
7.
Use a small pozi-driv screwdriver to remove the screw and lockwasher securing the green/yellow
fan ground wire to the top of the rear panel frame.
8.
Use a small pozi-driv screwdriver to remove the four screws holding fan to the rear panel and
remove the fan.
1.
2.
3.
4.
9.
Assemble the bulkhead connector, lock washer and nut. Use the
inch nut driver to tighten the
nut to approximately 500 N-cm (45 in.-lb.).
Clean the pin and bead assembly using the procedures described in the Microwave Connector
Care Manual (HP part number 08510-90064) provided with your HP 85108 manual set.
Clean the mating surfaces with liquid freon or alcohol and lint-free swabs.
Check the pin depth of the gold nose connector. The pin depth specification is 0.0000 to
inch.
NOTE:
If the pin depth is not within specification, do not shim. Instead, install another pin and
bead assembly.
Reconnect the cables disconnected in step 1 using a
inch torque wrench rated at 56 N-cm
(5 in.-lb.).
Refer to Figure 5-8 and the following text to replace or repair these 3.5 mm test port connectors.
5-14
Test Set Troubleshooting
HP
Test Sets