HYDRA

Service Manual

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

SERIAL XXXXXXX (xxxxxxx denotes the 7-digit number. Leading zeros must be entered. Note: once entered, the number cannot be changed.)

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.

5A-25. Memory Card I/F PCA (A6) Troubleshooting.

5A-26. Power-Up Problems

The following discussion identifies probable fault areas if the installation of a Memory Card I/F PCA causes power-up failure for the instrument. The problem is probably a short on A6P2; the Microprocessor on the Main Assembly is prevented from accessing Flash Memory and NVRAM correctly. Make the following checks:

∙First check for a GND-to-VCC short on the Memory Card I/F PCA.

∙There may also be a short between an interface signal and VCC, GND, or another interface signal. Check signals D8 .. D15, A1 .. A4, XRDU*, XWRU*, MCARD*, XSCLK, DTACK*, MCINT*, and RESET*.

∙The short may be due to a CMOS input that has been damaged due to static discharge; the short is then detectable only when the circuit is powered up. Use an oscilloscope to check activity on each of the interface signals. Verify that signals are able to transition normally between 0 and 5.0V dc (VCC).

5A-27. Failure to Detect Memory Card I/F PCA

Proper detection of the Memory Card Interface depends on the FPGA (A6U1) being properly configured at power-up. Proper FPGA configuration is indicated by a low to high transition on A6U1-80 shortly after power-up. Normally A6U1-80 should be high before RESET* (A6U1-78) goes high. If the Memory Card Interface is not installed properly, an "ERROR d" is displayed by the Microprocessor during power-up. The Microprocessor checks for the presence of the Memory Card Interface by attempting to read one of the registers in the Memory Card Controller (A6U1). If A6U1-58 fails to drive the DTACK* signal low during the read access, the Microprocessor will abort the memory cycle and report the Memory Card Interface as being not installed.

Verify the RESET*, XMCARD*, XRDU*, XSCLK, and DTACK* signals on the Memory Card Interface. RESET* (A6U1-78) must be high. Using a storage oscilloscope, verify that DTACK* (A6U1-58) goes low while XMCARD* (A6U1-49) is low for the first read memory cycle to the Memory Card Controller (A6U1) during instrument power-up. It may be necessary to cycle the power on the instrument several times to verify this operation.

5A-30

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Fluke 2635A, 2625A service manual 5A-25. Memory Card I/F PCA A6 Troubleshooting, 5A-26. Power-Up Problems
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2635A, 2625A specifications

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