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Chapter 6  Disassembly and Repair
Mechanical Disassembly
4
6
External Timebase Circuit Board Disassembly
The External Timebase is an option to the basic instrument (Option 001). 
Remove the hex nuts and washers holding the rear panel 10 MHz In and 
10 MHz Out BNC connectors. Pull the External Timebase PC board (A3 
assembly) from the back panel as shown below. Then unplug the captive 
ribbon cable from the keyed connector on the main PC board (J601 on the 
A1 assembly). Remove the A3 assembly from the chassis. 
A3