Fluke 2680A Service Manual page 172

268XA
Service Manual
Error
Code
1 Bad boot software
image in FLASH
ROM.
2 Bad main
software image in
FLASH ROM.
3 RAM test failure.
6-26
Table 6-9. Relating Selftest Errors to Device Problems
Error Code Suspect
Description Assembly
Sys/Ctrl
PCA
Sys/Ctrl
PCA
Sys/Ctrl
PCA
Error Code
Discussion
Background The System Power/Controller Board
FLASH memory device, U20, is divided into sections.
One of these sections is the memory for the boot
software, which is used for device initialization. After the
device is initialized, the main code takes over and runs
the device.
Failure For this error to occur, the boot software is
either missing or is corrupted and must be reloaded.
Correction Reloading the boot software is a factory
procedure only. The only recourse is to order a new U20
device programmed at the factory if the software is
corrupted. Also see "Troubleshooting the Device."
Background The System Power/Controller FLASH
memory device is divided into sections. One of these
sections is the main software that runs the device.
Failure For this error to occur, the main software is
either missing or is corrupted and must be reloaded.
This failure is detected by a boot monitor condition,
which means the boot software completed but the main
software did not take over device operation.
Correction Reloading the main software is discussed in
"Updating Embedded Device Firmware" later in this
chapter. Also, see "Troubleshooting the Digital Kernel."
Background The System Power/Controller uses static
RAM devices U18-22. The boot software uses a portion
of RAM1 as a memory device.
Failure For this error to occur, the RAM devices did not
function correctly during the boot process. Either the
RAM devices failed, or the address decoding for the
RAM devices failed. Most of the address decoding is
located internal to the SYS/CTRL microprocessor, while
the RAM enable signal, CS1*, is generated by U6
microprocessor.
Correction Check the enable signal at the RAM
devices, including the RAMWE*, read/write signals. If
the inputs are correct, the devices themselves are
suspect. If the inputs are incorrect, work backwards
towards the signal source and locate the device that is
not performing. Also, see "Troubleshooting the Digital
Kernel." Check the SYS/CTRL U20 to make sure the
proper CS1* memory select enable and RAMWE*
strobes are produced.