Troubleshooting Guide
3
Keysight 8990B Service Guide
65
Instrument Self-Test
Table 3-2
Instrument self-test troubleshooting
Self-test
Purpose
Debug tip
Possible faults
Test point voltages
Ensures that all the supply
voltages are present
Replace the PSU
– Main board (high
probability)
– PSU (low probability)
Fan
Verifies that the fan
is working
Unplug and plug back the fan
assembly and the main board
– Fan assembly (high
probability)
– Main board (low probability)
Battery
Ensures that the lithium
manganese battery on the
main board is working
Replace the battery
– Lithium manganese battery
(high probability)
– Main board (low probability)
PLL
Ensures the connectivity
between the scope acquisition
board, DAP, filter board, and
DAP board
Unplug and plug back the
cable connection between the
acquisition board and DAP
filter board
– DAP filter board (high
probability)
– Test acquisition board
1 GHz or DAP board (low
probability)
Channel 1 measurement path
test
Ensures that the measurement
path of channel 1 is working
Replace the DAP board
– DAP assembly (high
probability)
– Main board or channel 1
sensor adapter board (low
probability)
Channel 1 memory interface
test
Ensures that the memory
interface of channel 1
is working
Replace the DAP board
– DAP assembly (high
probability)
– Main board (low probability)
Channel 4 measurement path
test
Ensures that the measurement
path of channel 4 is working
Replace the DAP board
– DAP assembly (high
probability)
– Main board or channel 4
sensor adapter board (low
probability)
Содержание 8990B
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