Maintenance
6–44
TDS 200 Series Digital Oscilloscope Service Manual
4. Select Mfg. Tests to start the front panel controls test.
Menu Settings Comments
Mfg.
Tests
Displays a front panel simulation used to check that all front
panel controls are operational
Loop
Diag.
Displays a menu of choices of how to run the diagnostics
used during manufacturing of the instrument
Repair
Clear
Error
Log
Remove all Error Log entries from memory and set the power
cycle count to zero
5. Select Test FP to start the front panel controls test.
Menu Settings Comments
Test
FP
Displays a front panel simulation used to check the operation
of all front panel controls
All buttons must be pressed and all knobs must be turned in
both directions before you can exit this test
Test
Screen
Checks the display screen pixels with different patterns from
each press of the button
Incr.
Contrast
Allows you to check the display contrast operation across
100% of the hardware range
Decr.
Contrast
Allows you to check the display contrast operation across
100% of the hardware range
Stop
Test
Exits the front panel test (Test FP) after all buttons and knobs
have been tested successfully and exits the screen test (Test
Screen)
6. Press each button and rotate each knob to verify the operation of all controls.
If all buttons and knobs have pass the test, pressing the lower menu button
(EXIT) exits the test.
7. If any button fails to operate, inspect and/or clean the switch keypad and the
front panel board contacts. If cleaning does not solve the problem, the switch
keypad, front panel board, or main board may be defective. Use the
procedure below to isolate the problem:
8. Replace the switch keypad and then retest the buttons. If the problem
persists, proceed to step 9.
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