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Slide #59
SC Board Isolation Procedure (TC-P42S1)
When the SC board is suspected to be the cause of a 6 or 7 blinks condition, it
can be isolated for confirmation.
To isolate the Scan Drive Section (SC, SU, and SD board), remove connectors
SC2 (Vsus) and SC20 (P+15V, P+5V, and scan pulses) from the SC board and
connector SS33 from the sustain board.
When this is done, the display is completely black (No picture)