TECHNICAL SERVICE BULLETIN 95-011a

DATE: NOVEMBER 11, 1995

SUBJECT: SOUND PCB LED DIAGNOSTIC ERROR CODES

TO: ALL DISTRIBUTORS

GAME: PINBALL MAGICÔ

REASON FOR BULLETIN: TROUBLESHOOTING TOOL FOR SOUND 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 FIND THE SEQUENCE TO FOLLOW FOR TROUBLESHOOTING A SOUND BOARD:

1. UPON POWER UP AND DURING SOUND BOARD RESET LED 1 WILL BE ON.

2. LED 1 WILL TURN OFF JUST BEFORE THE CPU BEGINS THE STARTUP SOUND BOARD SYSTEM CHECK.

3. IF THE CPU FINDS AN ERROR ON THE SOUND BOARD, LED 1 WILL BLINK (ONE SECOND PER BLINK) IN A PATTERN TO INDICATE WHAT PROBLEM HAS BEEN FOUND. THERE WILL ALSO BE A ‘BONG’ TONE EMITTED FROM THE SPEAKERS EACH TIME LED 1 BLINKS. REFER TO THE ‘BLINKS/BONG’ ERROR CODE CHART TO IDENTIFY THE ERROR FOUND.

DIAGNOSTIC TEST TONES

THIS TEST IS TO HELP FURTHER TROUBLESHOOT SOUND BOARD PROBLEMS:

1. TURN POWER OFF.

2. REMOVE ROM U28 ON THE SOUND BOARD.

3. TURN POWER BACK ON (IGNORE 2 BLINKS OF LED 1, U28 ERROR ).

NOTE: LED 1 WILL REMAIN CONSTANTLY ON (DIM) DURING THE TEST TONES.

NOW A DIAGNOSTIC TEST TONE OF 1KHZ IS REPEATEDLY MADE BY BOTH U22 AND U23 MPEG CHIPS AT A FIXED VOLUME LEVEL OF 8. BOTH TONES SHOULD BE MADE AT THE SAME TIME (THERE SHOULD NOT BE ANY PHASE DIFFERENCES), AND FROM THE SPEAKERS IT SHOULD SOUND LIKE THERE IS ONLY ONE TONE.

SOUND BOARD DIAGNOSTIC LED AND BONG ERROR CODES:

	LED./BONG ERROR CODES
Blinks	DESCRIPTION	POSSIBLE PROBLEMS
1	U27 RAM SECTION	IMPROPER VCC (4.75-5.25 VOLTS) BAD
		SIGNALS TO CHIP, OR BAD RAM.
2	U28 ROM SECTION	BENT PIN, WRONG EPROM, BAD SIGNALS
		TO CHIP, OR BAD RAM.
3	U29 ROM SECTION	BENT PIN, WRONG EPROM, BAD SIGNALS
		TO CHIP, OR BAD RAM.
4	U30 ROM SECTION	BENT PIN, WRONG EPROM, BAD SIGNALS
		TO CHIP, OR BAD RAM.
5	U31 ROM SECTION	BENT PIN, WRONG EPROM, BAD SIGNALS
		TO CHIP, OR BAD RAM.
6	U10 X9241 CHIP SECTION	MISSING SDA/SCL SIGNALS TO CHIP
7	U22 MPEG CHIP SECTION	BAD CLOCK, RESET AND OTHER SIGNALS
		TO OR FROM CHIP.
8	U23 MPEG CHIP SECTION	BAD CLOCK, RESET AND OTHER SIGNALS
		TO OR FROM CHIP.
9	BOF1 SIGNAL NOT HIGH	U22 MPEG CHIP, FLIP-FLOP, OR NCBOF1
		LINE TO FLIP-FLOP
10	BOF2 SIGNAL NOT HIGH	U23 MPEG CHIP, FLIP-FLOP, OR NCBOF2
		LINE TO FLIP-FLOP
11	SDA SIGNAL IS STUCK	SDA SIGNAL TO U10 IS STUCK
		HIGH OR LOW
12	SCL SIGNAL IS STUCK	SCL SIGNAL TO U10 IS STUCK
		HIGH OR LOW