Calibration
1502C MTDR Service Manual
6–25
To perform the Adjustment Procedure, the instrument must be removed from the
case and the EMI shields removed. Instructions on both procedures are located in
the Maintenance chapter of this manual.
Visual Inspection
If any repairs are made to the instrument, or if it has been disassembled, we
recommend a visual inspection be made.
1. Check all screws for tightness and that the screw heads are not burred or
rounded.
2. Set the line voltage switch on the rear panel to 110V and check for the proper
fuse (0.3 A).
3. Check if the LCD has been cleaned on the outside and the implosion shield of
the front panel has been cleaned on the inside.
4. Check that the knobs and buttons work properly. The NOISE FILTER,
DIST/DIV, and both V
P
knobs have detents; all others should rotate smoothly.
Check that the knobs are tight (no loose set screws). Check that the set screw
on the POWER switch shaft is tight.
5. Check the cables for proper connection polarity and tightness. Make sure the
cables on the front of the Main Board come down from the plug into the
instrument instead of curving toward the outside. All cables should have the
exposed ends away from the metal chassis.
6. If any components were replaced by soldering, check for solder balls, excess
flux, and wire clippings. Good soldering practices must be followed when
repairing this instrument.
Power Supply Checks and Adjustments
1. Set the front-panel controls:
NOISE FILTER 1 avg (3rd stop CW)
DIST/DIV 1 ft/div (4th stop CW)
V
P
.99
2. Make sure the POWER switch is in the OFF position.
3. Connect the 115 VAC output of the Variac into the AC socket on the rear of
the 1502C.
Remove the Case and EMI
Shields
Power-Up Procedure
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