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Troubleshooting
Power On Self Test
Display Does Not Operate
Display Cable
Disconnected
Backlight Does Not
Illuminate
4–14
Press the large oval button in the lower-left corner to power on the platform.
The power status indicator illuminates immediately. Allow several seconds for
the self test to complete.
NOTE.
The Batteries indicator briefly illuminates red if the batteries are too low to
power on the analyzer. Connect the external power supply or charge the batteries.
If the platform does not begin to boot at power up (no power up sound), try
removing the CMOS battery backup from the Processor board (BT520). Wait
approximately 15 seconds and reinsert the battery into its socket; then press the
power switch again. If the platform still does not boot, replace the Processor board.
If the display does not operate try the following procedures.
Do the following:
1. Verify that both ends of the LCD display cable are properly oriented and
fully seated in their connectors.
2. Remove and reinstall the backlight cable connectors.
If these steps do not resolve the problem, replace the display.
Verify the following backlight-related voltages.
WARNING.
To avoid electrical shock or burn, do not touch the backlight
connectors on the backlight inverter board.
Table 4-2: Backlight-related voltages
Board
location
Pin
Backlight
2, 3
Inverter board
CPU board
1, 2
6
3, 4
Measured
Location
voltage
CN2
510 Vrms
JR 1
+12 VDC
JR 1
0 V to +2.4 VDC
J660
3.3 VDC
H600 & SA2600 Service Manual
Frequency
54 kHz
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