Tektronix, Inc. DMM4040, Technical Reference

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General Maintenance
If the Meter Does Not Turn On
2
If the Meter Does Not Turn On
Use the following steps to help solve problems encountered when turning on the Meter.
1.
Verify the Meter’s power switch is in the “On” position.
2. Make sure that the power cord is firmly plugged into the power module on the rear of
the Meter.
3. Make sure the power source the Meter is plugged into is energized.
4. Ensure the Meter’s power line voltage is set to the proper value for your country. See
the “Fuse Replacement” section earlier in this chapter for instructions on changing
the Meter’s voltage setting.
5. Verify that the power-line fuse is good.
If these steps don’t solve the problem, then contact Tektronix for more help. See the
“Contacting Tektronix” section in the front of this manual for contact information.
Display Tests
To test the pixels on the front panel display, use the following steps.
1.
Press

.
2. Press the SYSTEM softkey.
3. Press the DISPLAY softkey.
All pixels of the display should be illuminated.
Disassembly Procedures
 Warning
To avoid electric shock, disconnect the Meter from power
before removing the cover.
Only qualified service personnel should attempt servicing this
Meter.
To disassemble the Meter, a #2 Phillips screwdriver and small crescent wrench are
required. There are three sets of disassembly instructions: general, main chassis, and front
panel.
General Disassembly
To disassemble the Meter:
1.
Turn off the power by turning off the mains power at the rear of the Meter and
removing the power cord. The front panel power key only puts the Meter in a power-
save mode and does not remove mains power from the Meter.
2. Remove all cables from the Meter.
3. Remove the Meter bumpers by pulling from a corner and stretching the bumpers off
the Meter.
4. Remove the bail by rotating the handle upright to a 90 ° angle from the top of the
Meter and pull bail out from the sides of the Meter.
5. Remove the top cover by removing the four screws on the bottom of the chassis, and
slide the cover towards the back of the Meter.
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