TECHNICAL SERVICE BULLETIN 95-010a

DATE: NOVEMBER 9, 1995

SUBJECT: CPU, LED DIAGNOSTIC ERROR CODES

TO: ALL DISTRIBUTORS

GAME: PINBALL MAGICÔ

REASON FOR BULLETIN: TROUBLESHOOTING TOOL FOR CPU BOARD

AFFECTS S/N’s: ALL

NORMAL OPERATION:

LED 1 GOES BRIGHT THEN DIMS 4 TIMES PER SECOND

LED 2 ON CONSTANTLY MONITORS +5VDC SUPPLY

FOLLOWING IS THE SEQUENCE TO TROUBLESHOOT A CPU BOARD.

1. AFTER THE CPU STARTS IT WILL FIRST TURN LED 1 OFF. IF LED 1 STAYS ON CONTINUOUSLY, CHECK U8 PIN 48 ON THE MICROPROCESSOR MAKING SURE IT IS NOT RESET. IF OK, CHECK CPU CLOCK CIRCUIT, ADDRESS AND DATA BUSES, INTERRUPT LINES, ETC..

2. THE CPU WILL DO SOME SYSTEM CHECKS, IF THERE IS AN ERROR THE CPU WILL TRY

TO DISPLAY AN ERROR MESSAGE ON THE DISPLAY, THEN IT WILL BLINK THE LED 1 FULL ON TO FULL OFF (1 SECOND PER BLINK). SEE TABLE ON THE FOLLOWING PAGE TO IDENTIFY THE PROBLEM AREA.

3. AFTER ALL CHECKS ARE MADE, THE CPU WILL THEN START ITS MAIN PROGRAM AND

FLASH THE LED 1 [FROM DIM TO ON] 4 TIMES A SECOND. AT THIS TIME THE CPU IS

RUNNING NORMALLY.

	CPU, LED Error codes
Blinks	DISPLAY DESCRIPTION	POSSIBLE PROBLEMS
1	U25 RAM ERROR	(4.75-5.25 volts), Bad
	(dynamic RAM	signals to chip or bad RAM.
2	U14 RAM ERROR	Missing chip, dead internal battery.
	(Non-volatile RAM)	Improper VCC (4.75-5.25 volts)
3	U1H ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Required Code ROM)	to chip.
4	U1L ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Required Code ROM)	to chip.
5	U2L ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Image ROM)	to chip.
6	U2L ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(image ROM)	to chip.
7	U3H ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Future Expansion ROM)	to chip.
8	U3L ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Future Expansion ROM)	to chip.
9	U4H ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Future Expansion ROM)	to chip.
10	U4L ROM ERROR	Bent pin, Wrong EPROM, Bad signals
	(Future Expansion ROM)	to chip.
11	U16 CHIP ERROR	Bad connection, signals, or chip.
	(actel 1020 programmed)
12	U8 MISSING X2 ERROR	Missing clock to pin 103 (x2) of
		CPU chip U16
13	MISSING ZERO X J2	Disconnected signal (zero cross) from power
		board (J3 Zero X) to CPU board (J2 zero X),
		wire pinch between backbox & lower cabinet.
14	BAD LINE SIGNALS	Disconnected/missing signals
		in-between power board J3 Line 5,
		Line V, or Pulse and CPU board J2
		Line 5, Line V, or Pulse.
15	IMPROPER DRIVER BOARD	Improper or disconnected driver
		board. Check ribbon cable.