User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 46
Issue 1 06/01
2.12 CCONT Serial interface Troubleshooting
If there are problems in CCONT’s serial control interface, self tests fail and
there is ”Contact service” shown on the display. Wintesla shows this fail as
”CCONT Interface”.
NOTE: Low level means 0V, high level means approximately 2.8V.
Check GENSCLK line at J318
Square wave, Freq. 2.17 MHz ?
(see note below?)
Check CCONTCSX line at J317
Activity?
Signal active low
Check GENSDIO line at R308
Activity?
Signal active high
NO
D300 or PWB
OK?
YES
Check all three lines simultaneously, see fig. below
faulty
Figure 34.
(Note: Measurement should show 2.17MHz square wave. This interface is con-
nected to CMT display also, so there is other activity too. The 3.1MHz clock is
targeted for CMT display, do not worry about that. The clock signal is low when
inactive.)
1. Measure all the three lines simultaneously (Figure 35).
Set the trigger to CCONTCSX line falling edge.
You should see the two cases, Figure 35 and Figure 36 .
(Channel 1–GENSClk,
Channel 2–CCONTCSX,
Channel 3–GENSDIO). High level is about 2.8V
Figure 35.