Maintenance
TDS 200 Series Digital Oscilloscope Service Manual
6–43
5. Turn the instrument off and disconnect the display module cable at J202 or
J102 on the main board. Carefully pull the cable straight up from the
connector to avoid damage.
6. Turn the instrument on.
7. Probe the pins of J202 or J102, checking for the same signals as in step 3.
8. If any of the signals are missing, the main board module is probably
defective. Replace it.
Follow these steps to troubleshoot a nonfunctional front panel.
Buttons. Use the manufacturing tests to check that each of the front-panel
controls operate properly.
1. To execute the internal diagnostic tests, remove all input signals from the
instrument and enable the service menus as described on page 5–2.
2. Press the UTILITY button and select Service from the menu selection.
Menu Settings Comments
System
Status
Displays the system menus
Do Self Cal Performs a self calibration
Error Log Displays a list of any errors logged
This list is useful when contacting a Tektronix Service Center
for help troubleshooting problems
Service Displays the service menus for adjustment procedures and
diagnostics
3. Select Service Diag. from the menu selection.
Menu Settings Comments
FCAL
INIT
Initiates the factory calibration routine to load new calibration
constants
FCAL
STEP
Steps through the calibration routine steps
FCAL
ABORT
Aborts the factory calibration routine without affecting any
calibration constants
Service
Diag.
Displays the service diagnostics menus
Front-Panel
Troubleshooting
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