Fluke 9000A-8080 Instruction Manual page 46

8080
A pod is considered inoperative when the performance of self test, or any other
troubleshooter operation, produces a troubleshooter message of POD
TIMEOUT -ATTEMPT/NG RESET. This troubleshooter message results from
a lack of response by the pod to troubleshooter commands. Since it is the
function of the Processor Section to respond to troubleshooter commands, lack
of response indicates failure of the Processor Section.
Prepare to troubleshoot the inoperative pod as follows:
1. Disassemble the pod by removing the PCB assemblies from the case,
and the shield from the PCB assemblies. Refer to Disassembly. It is not
necessary to separate the PCB assemblies at this point.
2. Remove the microprocessor from its socket.
3. Connect the pod under test to +5, -5, and+ 12 volt power supplies.
Apply power to the connector normally coupled to the troubleshooter:
use pins 2 and 15 for +5 volts, pin 14for+12 volts,pin 21 for-5 volts, and
pin 25 for ground. If available, use a second troubleshooter and shielded
cable to provide power to the pod.
4. Connect a 9000 Series Troubleshooter to a second pod. Apply power
to the troubleshooter, then connect the second pod ribbon cable to the
microprocessor socket of the pod under test.
CAUTION
Do not apply or remove any power with ribbon cable connected
between second pod and inoperative pod.
NOTE
All references to data and addresses in the following
troubleshooting guide are in hexadecimal notation.
With reference to the Theory of Operation contained in Section 4 and the
schematic diagram contained in Section 7, troubleshoot an inoperative pod
using the following steps as a guide:
5-12
I. Reset the pod by momentarily shorting pins 22 and 23 of the shielded
cable connector located on the upper PCB assembly.
2. Perform a BUS TEST.
3. Perform a RAM SHORT and RAM LONG TEST. The RAM
addresses are listed in Table 5-3.
4. Perform a ROM TEST. The ROM addresses are listed in Table 5-3.