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See the original scan at the bottom of this page |
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Commodore Symptomatic Chart Diagnosing Faulty IC Components On |
6502 | 6522 | 325302 | 901229 | LB311 | 592 | 9602 | 325572 |
| Error LEB blinks on power up | x | x | ||||||
| Searching with no red LED | x | x | ||||||
| Drive fails to read | x | x | x | x | ||||
| Fails to fomat | x | x | ||||||
| Stepper motor does not step | x | x | ||||||
| Will not save when drive heats up | x | x | ||||||
| Lights stay on, motor runs continuously | x | x | ||||||
| No LEDs on power up | Check power supply voltage, Check CR3, VR2, VR1, CR1 | |||||||
| Drive motor runs continuously with no green LED | Check 5Volt on power supply | |||||||
| Flashing light on and off | Check UC1, UD2 | |||||||
| Message of ‘FILE NOT FOUND’ is displayed | Check alignment, defective disk | |||||||
| Drive speed will not stabilize | Clean drive head w/ Alcohol, check alignment | |||||||
| Display reads ERROR 21-29 (Disk Errors) | Checl PCB speed (LAG570 – for Newt. Drive) | |||||||
| Write protect on ERROR #25 | Check WPS, UA1, Write Protect Switch, alignment | |||||||
| Track 18 Display 21 read ERROR | Check alignment, UC2, UE6, check R/W head | |||||||
| Will not load certain programs | Check alignment, track 0 stop | |||||||
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