VI. ROUTINE MAINTENANCE
A. DIAGNOSTIC TESTS
Prior to activating the built-in test routines, the game must be switched from its normal (play)
mode to the diagnostic mode (see Keyboard Display Unit installation, section IV). This is done with
the game on, by depressing the KEYB D/CLR Button on the Keyboard Display Unit (KDU). As the
game enters the diagnostic mode, all feature lights are turned off, the replay display blanks out and the
tilt light is turned on. The KDU ( Keyboard Display Unit) may now be used to aid service personnel in
the performance of diagnostic routines which either indicate that the game is functioning properly or
help isolate faulty circuits for repair.
B. KEYBOARD OPERATION
To start any diagnostic routine, the specific c,ode for that routine must be entered on the key
board. The codes and the routines they initiate are:
C. TEST PROCEDURE
1. LAMP TEST (1B)
Code
1B
3B
2B
Function
Lamp Test
Cyclic Lamp, Coil
&
Motor Test
Switch Test
After entering the " 1 B" code, repeated depressing of the " B" button
(8
additional times),
sequentially energizes eight groups of lamp circuits. As each group of circuits is energized, the number
designating that group will appear on the KDU readout.
The circuit groups are listed in the order they are energized.
Code
8
7
Lamp Circuits
#25 Magic number
4th card double hit
5th card double hit
6th card double hit
3rd card double-double hit
3rd card double hit
#22 magic number
#3
&
#6 double-double card feature
6th card regular win
6th card double-double hit
(Continued)
15
