HP 8924C Assembly page 135

Replacing the A16 Host Controller
RESTORING
CALIBRATION DATA
IN NEW A16
ASSEMBLIES
Replacing the "Boot
Code "
Locating Notch
N:\mkt\MANUALS\HP8924C\ALR\repair.fb
Calibration data for the entire Test Set is stored in EEPROM U21 on the
A16 Host Controller. When replacing the A16 Host Controller assembly,
you must remove the Cal Data EEPROM from the old A16 assembly and
insert it into the new assembly to preserve the calibration data for that
instrument.
"Boot Code" is the firmware that initializes the Test Set on power-up. It also looks
at the PCMCIA card port at power-up to see if a firmware revision card has been
inserted. This code is stored in EPROM U65 on the A16 Host Controller.
If a new version of boot code needs to be installed, carefully remove the old
EPROM and insert the new part, being careful to orient the notch on the EPROM
as indicated in the following drawing.
S4 S3 S2 S1
Boot ROM
U65
Front of Test Set
Cal Data EEPROM
U2
Pin 1
Chapter 3, Repair
Replacing the A16 Host Controller
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