HYDRA

Service Manual

5-10. Analog Troubleshooting

Warning

To avoid electric shock, disconnect all channelinputs from the instrument before performing anytroubleshooting operations.

Refer to Figure 5-4 and Figure 5-5 for test point locations on the A/D Converter PCA.

First, check for analog-related errors displayed at power up. An ’Error 9’ means that the Main Microprocessor A1U4 is not able to communicate with the A/D Microcontroller A3U9. ’Error A’ and ’Error b’ mean that a failure has occurred in the internal memory of the A/D Microcontroller A3U9. ’Error C’ means that the Analog Measurement Processor A3U8 is not functioning properly.

Check the inguard power supplies on the Main PCA with and without the A/D Converter PCA connected. The inguard supplies must be measured with respect to COM testpoint A1TP30.

Power Supply

Test Location

Acceptable Range

VDD

A1TP31

+5.00 to 5.70V dc

VSS

A1TP32

-5.10 to -5.75V dc

VDDR

A1C6

5.30 to 5.95V dc

Check the inguard supply voltages on the A/D Converter PCA with respect to A3TP9. The following table lists the components nearest the power supply test points.

Power Supply

Test Location

Acceptable Range

VDD

A3C8

5.00 to 5.70V dc

VSS

A3C9

-5.10 to -5.75V dc

VDDR

A3C19

5.30 to 5.95V dc

+VAC

A3CR1

4.7 to 5.7V dc

-VAC

A3C26

-4.8 to -5.7V dc

5-12

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Fluke 2635A, 2625A service manual Analog Troubleshooting, Power Supply Test Location Acceptable Range
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2635A, 2625A specifications

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