HP 340 Series Service Manual page 58

Figure 3-2. Power Supply
Switch
Fuse
Figure 3-3. Power Supply Voltage Select Switch and Fuse
Test points on the processor board provide a means to check voltages. At the front edge of the
processor board, four pads are labled for ground, + 12 V dc, -12 V dc, and +5 V dc.
If the fuse blows, the power supply is probably bad and should be replaced.
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Functional Description