Issue 15, 1985 : Disk Drive 4 

Model: 1541 

RE: COMMON FAILURE SYPTOM: DRIVE RUNS CONTINUOSLY. 

TROUBLESHOOOTING GUIDE: 

1) Check system RESET - 6502, Pin 40 
2) Check system RINS 
3) Check 7417 driver - UD2 
4) Check R/W - Must be LOW (Not above 4.0V) 
5) Check for cold solder joint at J7 (Newtronics only) 
6) Check MTR signal - UC2, 6522 
7) Check _MTR signal - UC1, PLA 


NUMEROUS CALLS HAVE COME IN TO THE TECH HOT LINE CONCERNING THIS FAILURE INDICATION. 

PLEASE REFER TO THIS CHECK LIST BEFORE CALLING FOR HELP.