Keysight Technologies E4981A, Service Manual

Page: 66 / 152

64 Chapter 4
Troubleshooting
Function Specific Troubleshooting
To Check the Scanner Interface Function
Perform this test only when troubleshooting the Interface Board. This test verifies the
scanner interface function.
Equipment
Procedure
Step 1. Disconnect the power cable from the E4981A and allow 1 minute for the internal
capacitors to discharge.
NOTE
Dangerous energy/voltage exists when the E4981A is in operation, and for a time after it is
powered down. Allow 1 minutes for the internal capacitors to discharge.
Step 2. Remove the PSU Deck according to the procedure for describing in “PSU Deck Assembly
Removale” on page 95 .
NOTE
The interface board contains electronic components that can be damaged by static
electricity through electrostatic discharge (ESD). To prevent ESD damage, maintain
frequent contact with any bare sheet metal surface on the chassis. A grounding wrist strap
(or similar device) is useful for this purpose. Handle the board carefully at all times. Avoid
touching electronic components or circuit paths.
NOTE
Before performing Step 3 , note the switch settings on the Interface Board in order to return
them to the same settings at the end of this function test.
Step 3. Set S2 and S3 on the Interface Board to the same settings as when the board is shipped
from the factory referring to
Figure 4-11 , Table 4-9 , and . Table 4-10
Table 4-8 Equipment List of the Scanner Interface Function Test
Scanner Simulator Keysight p/n 04278-65301
DC Power Supply Keysight E3610A
1 k
Ω
Standard Keysight 42030A (42037A)
Table 4-9 Setting Bit Switch (S2)
Bit Default
1-8 Off
Table 4-10 Setting Bit Switch (S3)
Bit Default
1 Off
2 Off