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8-16 TEST SET MODULE
ASSEMBLIES
The following paragraphs provide instructions for removing and re
-
placing the RF/microwave components that comprise the Test Set
Module .
Equipment Required:
q
Connector torque wrench (
5
16
in), ANRITSU Model 01-201, or
equivalent.
q
Open-end wrench, 1 in.
CAUTION
Throughout these procedures, always use the
5
16
in. con
-
nector torque wrench for connecting the Test Set Module
semi-rigid coaxial lines and RF/microwave components.
Use of improper tools may damage the connectors, result
-
ing in degraded instrument performance.
Preliminary:
q Switch373XXA power off. Remove the power cord.
q Remove all covers (paragraph 8-3).
Transfer Switch Use the following procedure to remove/replace the Transfer Switch,
which is common to all 373XXA models.
Procedure:
Step 1. For all models except 37269B: disconnect the semi-rigid co-
axial line W87 from the input connector of the Transfer
Switch. See Figure 8-11.
For Model 37269B: loosen the two screws that fasten the
Transfer Switch mounting plate to the test set tray before
disconnecting the semi-rigid coaxial line (W80). See Fig
-
ure 8-12.
Step 2. Disconnect the Transfer switch.
Step 3.
Carefully flex (do not bend) the rigid-coaxial lines to gain
access to the lower connectors of the Transfer Switch; see
Inset A on Figure 8-11. Remove rigid-coaxial lines from
these connectors.
Step 4. Disconnect the Transfer Switch power cable at connector J5
of the A17 Motherboard PCB. Free the cable by separating
it from the cable harness and by temporarily removing the
A24 VME Terminator PCB.
Step 5. Remove the two screws that fasten the Transfer Switch
mounting plate to the test set tray, and lift the Transfer
Switch assembly from the Test Set Module.
REMOVE AND REPLACE TEST SET MODULE ASSEMBLIES
373XXA MM 8-25