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Corrective Maintenance
Maintenance
6Ć78
TableĂ6Ć4:ăChecks Required After FRU Replacement (Cont.)
FRU Replaced Checks Required
A19 Strobe/TDR Buffer
Board
PowerĆOn Diagnostics
Extended Diagnostics
Sweep Rate Accuracy
Internal Clock
A20/A21 Head InterconĆ
nect (Power Only) Boards
Functional check of a powerĆonly device such
as an SDĆ42, SDĆ46, or SDĆ51 Sampling Head
A22/A23 Head InterconĆ
nect Boards
PowerĆOn Diagnostics
Vertical Accuracy
System Vertical RMS Noise
A26 M/F Acquisition
Interconnect Board
PowerĆOn Diagnostics
Extended Diagnostics
Vertical Reference Voltage
A27 Acquisition Analog
Board
PowerĆOn Diagnostics
Extended Diagnostics
Vertical Accuracy
System Vertical RMS Noise
A28 Acquisition MPU
Board
PowerĆOn Diagnostics
Extended Diagnostics
Firmware ICs PowerĆOn Diagnostics
Extended Diagnostics
Cathode Ray Tube (CRT) Display
Power Supply Module PowerĆOn Diagnostics
Extended Diagnostics
Power Supply
Vertical Reference Voltage
Vertical Accuracy
System Vertical RMS Noise
Sweep Rate Accuracy