Troubleshooting
TDS5000B Series Se r vi c e Manual
6-- 65
PC Interface LEDs
When the oscil l osc ope is powered on, the PAI Loading and the Load Error LEDs
(CR700 and CR710) will turn on momentarily, and then turn off. The hard disk
activity can be monitored by observing the status of CR520.
Trou b l esh o o t i n g Using Reset Circuits
The PC Inter f a c e board uses a combination of removable jumpers and test points
to manipulate circuit reset for troubleshooting.
There are two PCI busses on the PC Interface board; the PC motherboard
primary PCI bus, and the L2 PCI bus. A hardware fault on any of these busses
can prevent Windows from starting properly.
PC Interface Board
PCI Bus
Transparent Bridge
PC Motherboard
GPIB
I/O Processor
PAI
Bus 2
69000 Video
PA BusJ1020
Figure 6--30: The PCI busse s (SN B030000 and above)
69000 Video Adapter
J200
PC Interface Board
PCI Bus
Transparent Bridge
PC Motherboard
GPIB
I/O Processor
PAI
PA BusJ1020
Bus 2
Figure 6--31: The PCI busse s (SN B029999 and below)
By grounding test points TP1102 or TP1103 (see Figur e 6--32) you can selective-
ly remove com pone nt s from the PC motherboard primary PCI bus. This is useful
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