Diagnostic Testing and Troubleshooting (2620A/2625A)

5

IEEE-488 Interface PCA (A5) Troubleshooting

The following command may be used to program the serial number into the EEPROM:

SERIAL XXXXXXX (xxxxxxx denotes the 7-digit number. Leading zeros

The serial number of the instrument can be accessed by using the "SERIAL?" command. The response will be "0" (if the serial number has not yet been set) or the 7-digit serial number.

5-25. IEEE-488 Interface PCA (A5) Troubleshooting

Refer to Section 7 for a discussion of troubleshooting the IEEE-488 Assembly.

5-26. Memory PCA (A6) Troubleshooting

5-27. Power-Up Problems

The following discussion identifies probable fault areas if the installation of a Memory PCA causes power-up failure for the instrument. The problem is probably a short on A6J1; the Microprocessor on the Main PCA is prevented from accessing ROM and RAM correctly. Make the following checks:

∙First check for a GND-to-VCC short on the Memory PCA.

∙There may also be a short between an interface signal and VCC, GND,or another interface signal. Check signals D0 .. D7, A0 .. A2, RD*,WR*, MEM*, and RESET*.

∙The short may be due to a CMOS input that has been damaged due tostatic discharge; the short is then detectable only when the circuitis powered up. Use an oscilloscope to check activity on each of theinterface signals. Verify that signals are able to transitionnormally between 0 and 5.1V dc (VCC).

5-28. Failure to Detect Memory PCA

If the PRINT destination cannot be set to "StorE", Hydra was unable to determine that the Memory PCA was installed at power-up. The PRINT destination selection procedure is described in Section 3 of the User Manual.

If the Memory PCA is not detected by instrument software, there may be a problem with the IRQ2* or OPS* signal. The Memory PCA connects these two signals when it is installed. A fault with A1R2 or the Microprocessor (A1U4) could also result in failure to detect the Memory PCA.

5-29. Failure to Store Data

Configure the instrument to fast reading rate, 3V dc range on channel 1, and scan interval of 0:00:00. Setup storage of all scan data to the Memory PCA: press SHIFT PRINT, select "StorE", press ENTER, select "ALL", and press ENTER. Then, if the "PRN" annunciator is not on, enable data storage by pressing PRINT ("PRN" annunciator comes on.)Finally, enable scanning press SCAN.

5-29

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Fluke 2625A, 2635A IEEE-488 Interface PCA A5 Troubleshooting, Memory PCA A6 Troubleshooting, Power-Up Problems
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2635A, 2625A specifications

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