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6. MAINTENANCE & TROUBLESHOOTING
6-7
Interference rejector
is not working (inter-
ference rejection
level not displayed)
1) SPU Board 1) Replace SPU Board.
Echo stretch is not
working (Neither
ES1, ES2 or ES3 is
displayed)
1) SPU Board 1) Replace SPU Board.
Range rings are not
displayed
1) Adjust their brilliance on the
Brill/Color menu.
2) SPU Board
1) Replace associated circuit board if unsuc-
cessful.
2) Replace SPU Board.
Advanced-level troubleshooting
Problem
Probable cause or
check points
Remedy