Sega INITIAL "D" TYPE TWIN. - Manual (Page 36)

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(4)INPUT TEST
Selecting the INPUT TEST on the game test
mode menu screen causes the screen (on
which each switch is tested) to be displayed.
Press each switch. If the display beside each
switch indicates "ON," the switch and wiring
connections are satisfactory.
(5)OUTPUT TEST
Select OUTPUT TEST from the Menu
screen in the Game Test Mode to cause
the screen (on which output unit such as
lamps and wiring connections are tested) to
appear. Ensure that the output unit functions
satisfactorily.
Perform the above inspections also at the time of monthly inspection.
GAME TEST MODE
INPUT TEST
STEERING XXH
ACCEL XXH
BRAKE XXH
GEAR POSITION N
START OFF
CHANGE VIEW OFF
SERVICE OFF
TEST OFF
PRESS TEST AND SERVICE BUTTON
TO EXIT
GAME TEST MODE
OUTPUT TEST
->START BUTTON
CHANGE VIEW BUTTON
PRESS TEST BUTTON TO EXIT