User manual

Testing the
Assembly
You can use the tests and checks in Table 4-2 to isolate the problem. See
Figures 3-1 through 3-4 in Chapter 3 for locations of mechanical parts. See
the component locator (drawing L-E1460-66502) included with this manual
for locations of electrical components.
Table 4-2. Agilent E1460A Tests/Checks
Test/Check Reference Designator Check:
Heat Damage - - - - - - - - - - Discolored PC boards
Damaged insulation
Evidence of arcing
Switch Settings SP1
SP2
LADDR setting
IRQ Level setting
Multiplexer PCA F1, F2
P1, J1
K1, K2, ..., K7
K10, K11, ..., K73
Fuse continuity
Connector contacts
Relay contact resistance
Checking for Heat Damage
Inspect the assembly for signs of abnormal internally generated heat such as
discolored printed circuit boards or components, damaged insulation, or
evidence of arcing.
Checking Switches/Jumpers
Verify that the logical address switch is set correctly (factory set at 112).
Verify that the interrupt priority jumpers are set correctly (factory set at
level 1).
Checking the Multiplexer PCA
Use the component locators in this manual to check the following:
• Verify that fuses F1 and F2 are good.
• Check the closed-channel resistance of all channel relays using the
procedure in Chapter 2. Replace any bad relays. Use Table 4-3 to
isolate the relay that corresponds to each failing channel.
• Check connectors P1 and J1 for damage.
Note
If the preceding steps fail to isolate the problem, use the schematics in this
manual to perform component-level troubleshooting.
Agilent E1460A Service Manual Service 51