Agilent Technologies 35670A Service Manual page 202

Troubleshooting the Analyzer
To troubleshoot IIC bus failures
Step 2. Check the serial clock (SCL).
G
• Attach a logic probe to A7 P7 pin 2 (SCL).
• Set the power switch to on (
• Press SW2 (reset switch) while monitoring A7 P7 pin 2 (SCL), the power-on
LEDs, and the display.
The TTL logic level should toggle when 00 is displayed and toggle continuously
when
Booting System
displayed after
Booting System
after power up.
Front Panel failure information:
keyboard IIC chip fails:
IIC: No Device Acknowledge
key stuck: 32
A power-on test has failed. Refer
servicing to qualified personnel.
Press Start key to attempt to continue
power-up.
4-26
).
l
is displayed. The following failure message should be
and the display grid should appear about 2 minutes
Agilent 35670A