Corrective Maintenance
Maintenance
6Ć78
TableĂ6Ć4:ăChecksRequired After FRU Replacement (Cont.)
FRU Replaced Checks Required
A19 Strobe/TDR Buffer
Board
PowerĆOnDiagnostics
ExtendedDiagnostics
Sweep Rate Accuracy
InternalClock
A20/A21 Head InterconĆ
nect (PowerOnly) Boards
Functionalcheck of a powerĆonly device such
as an SDĆ42, SDĆ46, or SDĆ51 Sampling Head
A22/A23 Head InterconĆ
nect Boards
PowerĆOnDiagnostics
VerticalAccuracy
System VerticalRMS Noise
A26 M/F Acquisition
InterconnectBoard
PowerĆOnDiagnostics
ExtendedDiagnostics
VerticalReference Voltage
A27 Acquisition Analog
Board
PowerĆOnDiagnostics
ExtendedDiagnostics
VerticalAccuracy
System VerticalRMS Noise
A28 Acquisition MPU
Board
PowerĆOnDiagnostics
ExtendedDiagnostics
Firmware ICs PowerĆOnDiagnostics
ExtendedDiagnostics
Cathode Ray Tube(CRT) Display
PowerSupply Module PowerĆOnDiagnostics
ExtendedDiagnostics
PowerSupply
VerticalReference Voltage
VerticalAccuracy
System VerticalRMS Noise
Sweep Rate Accuracy