Thermo Scientific GENESYS 20 Service Manual page 28

Troubleshooting
"RAM Failure"
"ROM Failure"
"Sample too bright"
"Sample too dark"
4 - 10
3. The mono motor is defective. Do
not replace mono motor. Replace
instrument.
1. The RAM is internal to the
microprocessor. Therefore, either
replace the 80C251 chip or the
entire main board. Please note the
second line of the display and
return the chip to the factory.
1. Improper EPROM (U3) installed.
Replace EPROM.
2. Hardware failure. Replace main
board.
1. Check if sample compartment door
is open or ajar.
2. Hardware failure. Check main
board, detector board, and
monochromator position (green
light at 550nm).
(See Update Information section
of manual)
1. Check if sample path is blocked.
2. Hardware failure. Check main
board, detector board, and
monochromator position (green
light at 550nm).