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Service Mode Entry Procedure Per Model.
From an idle state, press and hold
the "SIGNAL" and "LOCK"
buttons for 3 seconds to enter
service mode. Upon entering the
service mode, the control will be
in test selection mode and display
GFDN110
the first test number (t01).
GFDN120
Rotating the knob either clockwise
GFDN130
or counter clockwise increment or
GFDS140
decrement to the next or previous
GFDS150
test.
GFDS155
GFV40ES
Once the test number is selected,
pressing start will begin the
selected test. Pressing power will
terminate that test and bring the
control back to test selection
mode. Pressing power again will
exit service mode.
From an idle state, the following
sequence must be pressed:
"VOLUME">"DELAY">
"VOLUME">"DELAY". If they are
not pressed in this order of any
other button is pressed. The
sequence must be started over
from the beginning. Upon entering
the service mode, a BEEP will be
heard and the control will be in
GFD43
test selection mode and display
GFD45
the first test number (t01).
Rotating the knob either clockwise
GFDN160
GFDS170
or counter clockwise increment or
GFDS175
decrement to the next or previous
test.
YFD45
Once the test number is selected,
pressing start will begin the
selected test. Pressing power will
terminate that test and bring the
control back to test selection
mode. Pressing power again will
exit service mode.
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