Maintenance
6–26
WFM 601A, WFM 601E, & WFM 601M Service Manual
The waveform monitor is protected with an F-type cartridge fuse. Figure 6–22
shows the fuse location on the Power Supply (A1) circuit board. Replace the fuse
with the correct type and value. The correct type and value is silk screened on the
circuit board, adjacent to the fuse holder. Using a higher rated or slower acting
fuse can damage a circuit.
Line Fuse
F1
Figure 6–22: Location of the line fuse on Power Supply board
The Power Supply is a switching power supply and requires a specific trouble-
shooting procedure to avoid personal danger or instrument damage.
WARNING.
Dangerous voltage levels exist in the Power Supply even after the line
cord is removed from the main AC supply. Read the instructions in this section
before beginning to troubleshoot this Power Supply.
The Power Supply presents special troubleshooting problems. The Trouble-
shooting procedure that follows will help you isolate a problem to a specific
circuit. Analyze the circuit using the schematics to find the defective compo-
nent(s), or try part substitution in the suspect circuit.
Line Fuse Replacement
Power Supply
Troubleshooting
Summary of Contents for WFM 601A
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