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Troubleshooting the Analyzer
To troubleshoot display failures
5 Check the digital output signals to the LCD display.
a Using a logic probe verify that TTL logic pulses are present at the
following locations:
b If any of the signals are incorrect, the A82 LCD Interface
assembly is probably faulty
c Verify the back lights and inverter boards. When the display is in
the test position the back lights are visible from the side of the
display. Use this procedure if one or both are not lit.
a Press Display, more display setup, color setup, brightness, 100%.
The brightness level controls the voltage applied to the back lights.
b Check for
+4.5 Vdc ± 0.2 V at A82 TP2 using a voltmeter.
c If this voltage is incorrect then the A47 assembly is probably
faulty.
d Check for
+1.2 Vdc ± 0.2 V at A82 TP8 using a voltmeter.
Signal Line Probe Location
B0 R31
B1 R19
B2 R24
B3 R23
B4 R16
B5 R22
G0 R32
G1 R20
G2 R27
G3 R26
G4 R17
G5 R25
R0 R33
R1 R21
R2 R30
R3 R29
R4 R18
R5 R28
DENA R36
VSYNC R38
HSYNC R37
CLK R44
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