Technical data

18 Agilent 35670A Supplement
4 Service Guide
Replace Step 7: Check signals required for power up.
• Using a logic probe, check the following signals.
• Using a logic probe, check that A17 P10 pin B20 (SCL) and
A17 P10 pin C11 (SDA) toggle TTL states at least twice just
after power up.
• If the signals are correct, go to page 4- 15, “To troubleshoot
power- up failures.”
Signal Name Test Location TTL State Probable Faulty Assembly
PVALID TP202-1 High A98 Power Supply
RSTn P11-32 High A17 CPU
ASn P17-27 Toggling A17 CPU
+5V A17 TP212 High A98 Power Supply
+3.3V A17 TP 216 High A17
C20MHz A17 TP1 Toggling A17
PASn TP205 Toggling A17
DSACK1n TP207 Toggling A17
DSACK0n TP206 Toggling A17
PRW TP210 Toggling A17
PDSn TP209 Toggling A17