THE 1541 FIXER

BY BILL DUN

Note: this information is presented without warantee or gaurantee to it's reliability or effectiveness. Nor does it imply that these methods will work or are the only ones possible.

Reprinted from the Commodore Club of Rockford Newsletter - March 1993

QUICK CHART

Code	Check These	Code	Check These
A	6502	E	LM311
B	6522	F	582
C	32530201	G	9602
D	90122905	H	32557202

CHECK THESE								SYMPTOM
6502	6522	32530201	90122905	LM311	582	9602	32557202
A		C	D					ERROR LED STATUS ON ALL THE TIME
	B							DRIVE MOTOR RUNS ALL THE TIME AND LED STAYS ON
A			D					DRIVE MOTOR RUNS ALL THE TIME AND LED STAYS OFF
	B							AFTER WARM UP, MOTOR RUNS ALL THE TIME
			D	E				DOES NOT LOAD WHEN HOT OR LED FLASHES 3 TIMES
			D					SEARCHES WITH LED FLASHING CONTINUOUSLY
		C						SEARCHING WITH NO RED LED
					F	G	H	DRIVE FAILS TO READ
	B						H	FAILS TO FORMAT DISK
A	B							STEPPER MOTOR DOES NOT STEP FORWARD
A								WILL NOT SAVE WHEN DRIVE HEATS UP
			D					LIGHTS STAY ON, MOTOR RUNS CONTINUOUSLY

OTHER SYMPTOMS

NO LED'S ON POWER UP

FUSE & POWER SWITCH
+5/12 VOLT LINES
POWER CORD

FLASHES ON POWER UP

ALL RAM & ROM'S

DRIVE MOTOR RUNS WITH NO RED OR GREEN LED'S

VR2 POWER TRANSFORMER

LOADS PROGRAMS WITH RED LED FLASHING

DRIVE SPEED
STEPPER MOTOR

LOADING INTERMITTENT

ALL ROM'S
DRIVE ALIGNMENT

MESSAGE OF "FILE NOT FOUND"

CLEAN DRIVE
HEAD-0 STOP
ADJ.-ALIGNMENT

DRIVE SPEED IS NOT STABLE

DC MOTOR

LOCKS-UP WHEN LOADING

901229-05

FAILS THE PERFORMANCE TEST & DISPLAYS ERROR 21

CHECK TEST DISK
DRIVE MOTOR

FAILS THE PERFORMANCE TEST & DISPLAYS ERROR 27

STOP ADJUSTMENT

PASSES PERFORMANCE TEST TO TRACK 18 DISPLAYS ERROR 21

READ/WRITE HEAD

PASSES PERFORMANCE TEST BUT WILL NOT LOAD PROGRAMS

STEPPER MOTOR

FLASHING LIGHT ON & OFF DURING LOADING

ALIGNMENT

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