OCT/SLO SERVICE MANUAL Version V.4
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Troubleshooting:
Q; The system only shows every other longitudinal (B-scan) image.
A: Check the cable connection from the encoder to the PC. Especially the internal PS2
cable and also the internal 15-pin D-type connector to the MCB.
Q: The system performs correctly, but will not switch to B-scans.
A: Check for a broken connection on the 15-pin D-type connection cable attached to the
MCB.
Q: Vertical Bands Appearing in OCT image.
A: Electronic root, caused by either, variation of symmetry of DC power supply to the
low noise +/-15V supply, or miss-adjustment of the SYM (symmetry) potentiometer on
the current OCT electronics box. This may happen when the voltage is switched from
120V to 100V on the isolation transformer. An earlier optical cause reported should now
be solved.
Another possible solution is to replace the X-scanner cable between the scanner driver
and scanner head. If neither of these solutions work, please inform OTI.
Q: Internal LCD noisy.
A: Bad solder contact, swap with correctly functioning unit.
Q: Main screen showing negative temperature.
A: After checking the cables are correctly connected between the PC and the chinrest
and that power is on. This could be breaking of the cable for temperature sensor, replace
with new one, correctly cable tied. This is the internal PS2 connector between the
chinrest base and optical head.
Q: ‘Criss-cross’ Noise in the SLO channel.
A: Primary cause is power supply noise. Check that power supply conforms to noise
requirements and if it does not replace.
