Troubleshooting
Solutions to c
ommon problems
For the common instrument problems listed below, perform the indicated
troubleshooting procedure(s).
Table 4-1: Troubleshooting common problems
Symptom Troublesho
oting procedures
No lights on the instrument
Check the AC
power connection
Swap in a re
placement Power Supply module
Check the C
ombiner board voltages (See page 4-16.)
Power Sup
plies are running but the rest of the instrument is not
running
Check the
Power Supply module LEDs (See page 4-5.)
Check the
16-pin and 26-pin ribbon cables to the front panel
(See page 4-15.)
Check the 14-pin power cable between the C ombiner board
and the Main board (See page 4-15.)
Check the Combiner board voltages (See page 4-16.)
Keyboard is i lluminated but is not responding
Check that the Main board 3.3 V supply is OK (See
page 4-
18.)
Verify
that the Main board PLD is programmed (See
page 4-18.)
Displ
ay is running but the keyboards are not running
Check the 26-pin ribbon cable to the Front Panel board
(See page 4-15.)
Check that the Main board 3.3 V supply is OK (See
page
4-18.)
Veri
fy that the Main board PLD is programmed (See
page 4-18.)
Keyboard is running but the LCD display is not running Check the 16-pin ribbon cable to the LCD display (See
page 4-15.)
Check the Processor board (See page 4-19.)
No channels are switching between Primary and Backup s ources
Verify that the AC power LEDs are green (See page 4-5.)
Only some channels are switching between Primary and Backup
so
urces
Check the 60-pin cables to the channel modules (See
pa
ge 4-15.)
C
heck the power-on self test (See page 4-4.)
Fault LEDs are green with no signal attached
C
heck the 60-pin cables to the channel modules (verify that
all cables go to the correct connector on the Main board)
(See page 4-15.)
Check the power-on self test (See page 4-4.)
Check the diagnostics for miss-connected modules (See
page 4-16.)
4–2 ECO8000 Series Service Manual
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