Agilent Technologies 2712A, 2948 manual HP 8904A Opts

Model 8904A Service

HOW TO RESTORE THE SERIAL NUMBER

IN A REPLACEMENTA2 DIGITAL ASSEMBLY

Description

If the A2 Digital Assembly has been replaced by a new or exchange assem,,;, the instrument’s serial number suffix will need to be entered into non-volatile memory (RAM). The suffix is the last five digits of the serial number. For example, the suffix of serial number 1234A56789 is 56789.

The serial suffix can be entered from the front-panel keyboard by the following procedure. Note, however, that the procedure will only work for an assembly coming from a Hewlett-Packard sales office or service center. If the instrument has lost the contents of its non-volatile memory (for example, if the backup battery fails), the serial number cannot be entered; the A2 Digital Assembly must first be replaced, then the serial number can be entered.

The procedure is written with simple steps followed by detailed notes. Normally, it is only necessary to follow the simple steps and ignore the notes. Refer to the notes when a step doesn’t work quite right.

NOTE

If the instrument htls Option 001, 003, and/or 005, these options can be restored after restoring the serial number. Refer to the procedure following this one.

Procedure

1.Switch LINE to OFF and then back to ON. After the instrument powers up, the display should read

I * HP 8904A Main Selection Level * I

f l Channel Confia.

NOTE

After about 3 minutes if no key has been pressed, the backlighting on the display will go off. This is normal. When another key is pressed the backlighting will go back on.

2.Press SHIFT PRESET. The display will look something like the following, then after about 3 seconds it will time out. (The example shows an instrument with Option 002 installed.) Check that the serial suffix is 00000.

HP 8904A Opts 02

Firmware Revision 18387A Serial No 00000

rev.15DEC89 Troubleshooting (Serial Numbers) 8-43