Fluke 41B - Troubleshooting the EEPROM

Troubleshooting
Troubleshooting the Digital Section
5
5-11
5-10. Troubleshooting the EEPROM
The EEPROM (U11) is used for waveform storage and is only installed on the Model
41B. To isolate waveform storage problems, proceed with the following:
1. Verify that R82 and R84 are correct and installed. Also, verify that R83 and R85 are
absent.
2. Verify that CS_EEPROM is changing states correctly when trying to read/write a
waveform to EEPROM. The write timing to EEPROM should have similar timing
with the RD signal replaced with the WR signal. If the CS_EEPROM* pulse is not
generated, verify that all of the correct signals are present on U3 (A15, A14, A5, A4,
RD, WR, XY, PS). If all signals are present and you still do not have a correct
CS_EEPROM* signal, U3 may be defective.
A0-A15, DS*,
PS*, X/Y*
CS_EEPROM
CLOCK
RD
DATA
0 ns 100 ns 200 ns 300 ns
Address Bus, DS, PS, XY
15 Min/Max
285.46 Min/Max
100 Min/Max
250 Min/Max
281.96 Min/Max
263.15 Min/Max
15 Min/Max
6.20 Min/Max
5.05 Min/Max
0
t20i.eps
3. Finally, if there are no solder problems with U11 (all address and data lines are
properly connected), and the timing of the signals to U11 is correct, but the data
written to U11 is not read back properly, U11 may be defective.