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Diagnostic Testing and Troubleshooting (2620A/2625A)
IEEE-488 Interface PCA (A5) Troubleshooting
5
5-29
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.