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Section 7
OM6530-C1-00
19 November, 2019
7-2
7.2.
NON VOLATILE MEMORY CHECKSUM
The model 6530 TeraOhm Bridge-Meter contains a bank of memory into which certain operating
data are written and stored. This memory is non-volatile in that data are kept even when power is
removed from the instrument.
The integrity of the data in this memory is checked on power up and on an instrument RESET by
comparing a stored checksum value with a calculated value. The two checksum values should
agree. Occasionally, the stored checksum value may not agree with the newly calculated value
(on RESET or Power Up) due to an operator error in entering new data into the non-volatile
(NV) RAM or when the non-volatile (NV) RAM battery is low.
When this occurs the 6530 will display the message "NON-VOLATILE MEMORY FAILURE,
Press any key to continue". The 6530 will restore factory-set default values and will calculate a
new checksum, then reinitialize all non volatile memory.
7.3.
TROUBLESHOOTING
Symptom
Possible Cause
No display
Instrument not plugged into source of AC power.
Instrument not powered ON.
Power Supply fuse open.
Cable between CPU PCB and Display PCB loose.
Faulty connector on cable between CPU and Display
PCB.
Faulty Display PCB.
Faulty CPU PCB.
Faulty Power Supply PCB.
Display on but no Keyboard response
Keyboard switches locked out by remote controller.
Cable between CPU and Display PCB loose.
Faulty connector on cable between CPU and Display
PCB.
Faulty Display PCB.
Display on but only partial Keyboard
response
Cable between CPU and Display PCB faulty.
Faulty Display PCB.
RS-232C no response
Incorrect baud rate set.
Talk/Listen mode not selected.
RS-232C cable not connected to instrument properly.
Cable from rear panel RS-232C connector to CPU PCB
faulty.
Faulty CPU PCB.
Содержание 6530 Series
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