Performance Verification; Table 3-3 Performance Verification Troubleshooting - Keysight 8990B Service Manual

3 Troubleshooting Guide
Table 3-2 Instrument self-test troubleshooting (continued)
Sel f-test
Channel 4 memory interface
test
Video channels

Performance Verification

Table 3-3 Performance verification troubleshooting
Type of failure
Zero set failure
System accuracy failure
Rise/fall time failure
Time base frequency accuracy failure
Impedance failure
Offset accuracy failure
DC gain failure
Analog bandwidth check failure
Time scale accuracy failure
66
Purpose
Ensures that the memory
interface of channel 4 is
working
Ensures the functionality of
the video channels
Debug tip
Replace the DAP board
Unplug and plug back the sensor flex RF
connections
– Check that the BNC cable used is not
damaged
– Check that the BNC cable is connected
to the Trig Out and not to Trig In
Debug tip
Replace the DAP board
–
Possible faul ts
– Main board
– DAP assembly (high probability)
– Main board (low probability)
– Main board (high probability)
– Sensor flex (low probability)
– DAP assembly (low probability)
Main board
– Scope acquisition board
– Scope acquisition board
– Scope acquisition board
– Scope acquisition board
– Scope acquisition board
Possible faul ts
– DAP assembly (high
probability)
– Main board (low probability)
Scope acquisition board
Keysight 8990B Service Guide