Agilent-technologies 83438A Manual do Utilizador descarregar pdf (Página 72)

5-18

Servicing

Troubleshooting

To check the A4 Power Supply Board Assembly

Check the 6.3A fuse in the rear-panel’s line module FL1. Refer to “To check the

line-power fuse” on page 5-19.

Remove the power supply cable from J2 on the A5 Laser Driver Board

Assembly. The end of this cable can be probed to measure all of the dc voltages

supplied in the instrument. The following list shows each wire color, its color

code, and its purpose:

• Red (2) wire: +15V

• White/red (92) wire: +5V

• Violet (7) wire: –15V

• Black (0) wire: ground

• White/black (90) wire: ground

If no voltages are detected, check that the ac line input voltage at the cable that

connects to J1 on the A4 Power Supply Board Assembly. Measure the line

voltage across the white/gray/red wire and the gray wire. If the ac line voltage

is present, replace the A4 Power Supply Board Assembly.

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Agilent-technologies 83438A Manual do Utilizador Página 72