Lite för gammalt spel för mig, men här kommer lite saxat från Marvins:
Power-on Tone(s).
When the system 11 games boots, it produces power-on tone(s). Here is the breakdown of the tone(s):
No Sound: sound/speech board is not operating, or a failure is affecting the sound circuitry (broken or disconnected cable, dead amplifier, bad speaker).
One Tone: sound/speech system OK.
Two Tones: sound/speech RAM problem.
Three Tones: U4 problem.
Four Tones: U19 problem.
Five Tones: U20 problem (System 11C).
System 11a, 11b, 11c CPU board LED's.
On system 11a, 11b, and 11c CPU boards, there are three LED's about in the middle of the CPU board. For a working game, here are what these three LED's should be doing when the game is turned on and in attract mode:
Left LED (labeled "+5 vdc"): shows that +5 vdc is present. This LED should always be on.
Middle LED (labeled "diagnostics"): should be continually flashing.
Right LED (labeled "blanking"): shows the blanking circuit is working, and should always be on.
System 11a, 11b, 11c Diagnostic Flashes.
These games do not have a 7 segment display. Instead there is a LED which indicates the memory chip test being preformed. To start the memory chip test, turn the game on or press the bottom CPU diagnostic switch button SW2 on the left side of the CPU board. Quickly count the CPU board LED flashes of the middle (diagnostic) LED, and compare them to the follow chart.
Flash Display Message Explanation
1 U25 RAM Failure U25 RAM could not be used. No other tests are performed; the game is locked here until the problem is fixed.
2 Memory Protect Failure This message means: (A) the coin door may be shut; (B) the Memory Protect switch may be stuck in the ON position; (C) the Memory Protect logic is protecting the audit memory; (D) a U25 RAM failure is occurring. Note this test assumes the coin door is OPEN since this test is initiated ONLY by pressing the CPU diagnostic switch (SW2).
3 U51 PIA Failure 6821 PIA at U51 has failed (score display circuit). *
4 U38 PIA Failure 6821 PIA at U38 has failed (switch matrix, spec sol A&B) *
5 U41 PIA Failure 6821 PIA at U41 has failed (score display data 1J2, spec sol B&C). *
6 U42 PIA Failure 6821 PIA at U42 has failed (sound board). *
7 U54 PIA Failure 6821 PIA at U54 has failed (lamp matrix, spec sol E&F). *
8 U10 PIA Failure 6821 PIA at U10 has failed (Sound outputs, solenoid drives, flipper relay). *
9 IRQ Failure IRQ has malfunctioned. It may be missing or too slow or too fast.
10 U27 ROM Failure The ROM (or EPROM) at U27 did not pass its internal checksum. This could be a ROM failure, or its associated components and connections may be causing this problem. U26 ROM test is skipped.
11 U26 ROM Failure The ROM (or EPROM) at U26 did not pass its internal checksum.
* Alternatively, the PIA's associated connections or components are causing the PIA to appear bad.
Low +5 Volts Causing U10 PIA LED Error.
On a F14 Tomcat and other sys11 games, occasionally a power-on U10 PIA failure error is seen via the diagnostic LEDs, but the game still play fine after a sucessful power-on (the U10 error would happen spuratically). This can often be attributed to an issue with the +5 volts being too low, below 4.9 volts DC (check the +5/12 volt power supply filter cap, as this may be the problem). If this issue is not fixed, it can fry the special solenoid circuit and other circuits.
