Locked on 1.E.D. Blues symptom for Battlezone?

Steve32089

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Before I send my Battlezone boards in for repair I was told that my game has the "Locked on 1.E.D. Blues" and I should check the TO-220 Transistors on the main board. I am researching whee those are but in the meantime has anyone dealt with this symptom before? Thanks
 
Probably "Locked on LED (Light Emitting Diode) Blues" referring to the fact that the lighted pushbutton LEDs in the cone switches are illuminated solid (not flashing). BZ is a great game but whoever repairs the boardset for you should also take several "bulletproofing" (making the boardset more reliable) measures including replacing the eight ROM sockets if you are not using a high score save kit (a HSS kit is highly recommended and enhances gameplay as it saves the high scores after power down and runs the code on board and not through the program ROMS on the AVG board - you don't have to replace six of the eight ROM sockets if you use this kit making BZ more reliable), replacing the .156" KK headers on the AUX and AVG pcbs if tarnished, adding heatsinks to the four 2901s, etc. The TO-220 transistors drive the coin lockout and coin counters - not sure what was meant by that advice.

Best,

Bill

Before I send my Battlezone boards in for repair I was told that my game has the "Locked on 1.E.D. Blues" and I should check the TO-220 Transistors on the main board. I am researching whee those are but in the meantime has anyone dealt with this symptom before? Thanks
 
Wow, thanks for the info. I think the credit counter was going non stop at one time. I will make sure whoever I send the board to will do what you said. Let me know if you have someone or yourself? Thanks
 
Never heard of the "LED locked on blues."

BTW, there is only one LED button on BZ (Asteroids has two). It is the "start" button. Normally it:
1) blinks briefly at power on.
2) blinks when there is one or more credit.
3) stays on during game play.
4) stays on during test mode.

Due to (1), I might expect a constantly watchdog-resetting PCB to exhibit a blinking LED, but I haven't had my PCB in the cabinet in that condition to verify.

Regarding TO-220 xistors: as previously suggested, Q4 Q5 & Q6 are for coin counters, and are thus pretty inconsequential. (BTW, the coin lockout coils on BZ are not PCB-driven. They are wired to be always activated if the power supply is on.) There are three other TO-220 package devices on the PCB, but they are not transistors. They are voltage regulators VR1 VR2 & VR3 (for -15, +5 & +15V respectively). I believe these are only used for DAC and output amplification, and shouldn't prevent a PCB from "playing blind."
 
Somebody actually pulled out the schematic instead of relying on memory (or has a better memory than I do) ..... :)

There are several qualified repair folks on KLOV - search the forums for battlezone and / or board repair then check out their feedback.

Last thought - if the coin counters are chattering sometimes that's a bad ROM or dirty ROM sockets - at any rate, the boardset needs some maintenance.

Best,

Bill




Never heard of the "LED locked on blues."

BTW, there is only one LED button on BZ (Asteroids has two). It is the "start" button. Normally it:
1) blinks briefly at power on.
2) blinks when there is one or more credit.
3) stays on during game play.
4) stays on during test mode.

Due to (1), I might expect a constantly watchdog-resetting PCB to exhibit a blinking LED, but I haven't had my PCB in the cabinet in that condition to verify.

Regarding TO-220 xistors: as previously suggested, Q4 Q5 & Q6 are for coin counters, and are thus pretty inconsequential. (BTW, the coin lockout coils on BZ are not PCB-driven. They are wired to be always activated if the power supply is on.) There are three other TO-220 package devices on the PCB, but they are not transistors. They are voltage regulators VR1 VR2 & VR3 (for -15, +5 & +15V respectively). I believe these are only used for DAC and output amplification, and shouldn't prevent a PCB from "playing blind."
 
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