Service Guide 4
Agilent 35670A Supplement 25
• If no error messages are displayed after Booting System or A17
DS101 (green run LED) is off, go to page 4- 29, “To
troubleshoot fast bus failures.”
✔ Step 3. Check the serial data line (SDA).
• Attach the logic probe to A17 P10 pin C11 (SDA).
• Press S5 while monitoring A17 P10 pin C11 (SDA), the power
on LEDs and the display.
The TTL logic level of the SCL signal should toggle continuously
while Booting System is displayed. The following failure message
should be displayed after Booting System and the display grid
should appear about two minutes 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.
• If the SCL signal does not toggle after S5 is pressed or the
failure message is not displayed, the A17 CPU assembly is
probably faulty.
Figure 10 Power-on LEDs and reset switch
DS 5
4
3
2
6
7
8
9
10
1
A17
CPU
S5
Green
Yellow
MSB
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