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They may just be lost information from the last probe attached. | They may just be lost information from the last probe attached. | ||
These failures should be cleared by recycling the power on the mainframe after replacing the NVRAM. | These failures should be cleared by recycling the power on the mainframe after replacing the NVRAM. | ||
Other than these failures, the plugin will operate normally once the diagnostic error codes are cleared by exiting the diagnostic screen. | |||
If the oscilloscope shows no failures after Enhanced Calibration, operation is fully calibrated except for transient response in the 11A52. | Other than these failures, the plugin will operate normally | ||
To avoid these recurring and annoying problems, the NVRAM must be replaced and the plug in serial number must be written into the NVRAM. | once the diagnostic error codes are cleared by exiting the diagnostic screen. | ||
The NVRAM is identified as a Dallas Semiconductor 1220Y and is the tallest, thickest chip on the board. It has 24 pins. | If the oscilloscope shows no failures after Enhanced Calibration, | ||
This NVRAM can be replaced with Dallas 1220AD-200, which is currently still in production and will have a battery that should last 25 years. | operation is fully calibrated except for transient response in the 11A52. | ||
To avoid these recurring and annoying problems, | |||
the NVRAM must be replaced and the plug in serial number must be written into the NVRAM. | |||
The NVRAM is identified as a Dallas Semiconductor 1220Y and is the tallest, thickest chip on the board. | |||
It has 24 pins. | |||
This NVRAM can be replaced with Dallas 1220AD-200, | |||
which is currently still in production and will have a battery that should last 25 years. | |||
Unsolder and remove the Dallas NVRAM. | Unsolder and remove the Dallas NVRAM. | ||
I recommend that the replacement NVRAM be socketed with a Mill-Max 110-41-624-41-001000 socket, available from Mouser Electronics and other suppliers | I recommend that the replacement NVRAM be socketed with a Mill-Max 110-41-624-41-001000 socket, | ||
The procedure to replace the NVRAM and install a serial number is the same for the 11A16, 11A32, 11A33, 11A34, 11A71, and 11A72 plugins, | available from Mouser Electronics and other suppliers. | ||
The procedure to replace the NVRAM and install a serial number is the same for the | |||
11A16, 11A32, 11A33, 11A34, 11A71, and 11A72 plugins, | |||
except for 12 additional constants required by the 11A52. | except for 12 additional constants required by the 11A52. | ||
Note: The 12 calibration constants for 11A52 high frequency transient response cannot be set using an 11300 series mainframe. | |||
'''Note''': The 12 calibration constants for 11A52 high frequency transient response cannot be set using an 11300 series mainframe. | |||
This is apparently due to a failure of the plugin design group and the 11300 series design group to communicate | This is apparently due to a failure of the plugin design group and the 11300 series design group to communicate | ||
in spite of the fact that the two groups were contiguous and had the same manager. | in spite of the fact that the two groups were contiguous and had the same manager. |