User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 36
Issue 1 06/01
2.9.4 CMT display backlight blinking 4 times in a loop
CMT display backlight blinking 4 times in a loop (”Serial Flash fault”):
D354 Serial Flash ID read
Check activity in serial FLASH lines
test fails
SEPClk (J327):6.5MHz clock (2.8V)
SEPO (J329): positive pulses (2.8V)
SEPCSX (J337): long negative pulse (2.8V)
EXT_SYS_RESETX (J301): high (2.8V)
SER_FL_RBY(J346): high (D300 internal pull–up, use passive
probe!) (2.8V)
SEPI (J328): Positive pulses
(D300 internal pull–up) (2.8V)
If no pulses found from J327, J328, J329 or from J337
problem is in D300
If J301 or J346 are low problem is D300
If J328 stays always high change D354
Figure 25.