Mastech MY-64 Manual Download

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Changing the Fuse in the MY64 Multimeter

15 September 2005, by Bob Lineberry, Page 3

Carefully lift the battery and connector out of the battery compartment. Notice the routing of the
battery cable through the case slot. Remove the battery.

Lift the circuit board straight up, using both hands. Continue working on a soft surface.

There is a plastic bushing, which may fall out. Save it.

Summary of Contents for MY-64

Page 1: ...strate a user Here are some instructions with pictures to help you be successful WARNING Static discharge can destroy your meter The ECE department will not be responsible for meter abuse If you have any doubts about your ability to perform this procedure consult with a Teaching Assistant in the Computer Engineering Labs After removing the test leads separate the meter from the yellow bumper using...

Page 2: ...ptember 2005 by Bob Lineberry Page 2 Lift up on the bottom end of the case with 2 screws The top of the case snaps on and off Guide the case back straight up from the meter being careful not to bend any internal parts The circuit board is revealed ...

Page 3: ...fully lift the battery and connector out of the battery compartment Notice the routing of the battery cable through the case slot Remove the battery Lift the circuit board straight up using both hands Continue working on a soft surface There is a plastic bushing which may fall out Save it ...

Page 4: ... Turn the circuit board over on the soft surface Find the 200 mA fuse Note the thick wire with the crimps in it This is the precision current shunt which should be protected Use a meter probe to gently pry one side of the fuse out of its holder Lift out the old fuse with your fingers If you look through the new fuse into a light source you may be able to see the tiny wire Locate the new fuse on th...

Page 5: ...ly guide the board back into the case Be careful not to force the board or bend any components When the board is in place the level of the board will match the level of the battery holder You may also turn the meter over to check for jack and switch alignment Make sure the plastic bushing is back in place ...

Page 6: ...y Page 6 Install the 9 volt battery aligning pins to sockets Using a meter probe guide the battery wires into the case slot Note the relative location of the black insulation on the battery wires Using both hands gently guide the back case over the circuit board Do not force ...

Page 7: ...rt again The screws are going into plastic You do not want to cut new threads Instead you want to feel the screw threads following the old threads Start tightening each of the 3 screws in a 1 2 3 1 2 3 sequence to make sure all screws are seating correctly and the required force is small If a screw seems tight reverse directions to avoid cutting new threads and start over Make sure the jacks and s...

Page 8: ...ver tighten metal screws into a plastic case or you may permanently damage your meter Maneuver the meter into the bottom of the yellow bumper Snap the meter top into the yellow bumper Perform a simple ohms test to make sure your meter is operating Congratulations Hopefully you have learned not to probe a voltage with a current meter ...

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Mastech MY-64, Manual

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