Commodore 1581 - Error Checking

1581 ALIGNMENT/REPAIR TEST
VERSION 1.5.1
1. DisConnect Power Cable and Serial Cables
2. Remove the Three (3) Screws from the Bottom Case and Remove
the Top Case from the unit
3. Remove the Drive FacePlate and Set it Beside the Unit
4. Remove the Four (4) Drive Mounting Screws
5. Remove the Two (2) Shield Screws and Remove the Drive Shield
6. Remove the Drive Assembly and Set it on its Side
7. Set Scope Channel 1 to DC Scale and 2V/DIV
8. Connect Scope Probe 1 to Test Point 3 (TP3)
9. Connect Power Cable and Serial Cable
10. Turn Drive Power ON
11. Insert a Formatted 1581 Diskette
* Press SPACE - Adjust Zero Stop
Go a a a rrr rr nr nnn rres--- +
a a a a a a a a a a a a a a a a nr nr rn rrr rrr +
| DO NOT ADJUST ZERO TRACK UNTIL RADIAL ALIGNMENT IS CORRECT |
$----------~~------- ~~ +--+ +
| 1581 ZERO TRACK ADJUST |
$———~— nn i nn nn nnn nnn ne +
1. Make Sure Current Track Displays 0 - Voltage Level Displays 0.0 VDC
* The Scope Reading Should also = 0.0 VDC
2. Press (+) - Step IN One Track
$------ - - - + + + + + + + + + - = - 5 ee + +
| ZERO TRACK ADJUSTMENT CHART
$--------------- +--------------- +o------------- $o------------- - --- - +
VOLTAGE CURRENT SCOPE ZERO TRACK
LEVEL TRACK READING STATUS
+--------------- +--------------- +-------------- +--------------------------
0.0 VDC 0 0.0 VDC OK
0.0 VDC 1 0.0 vbC OK
2.5 VDC 2 2.5 VDC OK
5.90 vpbc 3 5.0 VDC OK
5.0 VDC 4 5.0 vDC OK
+--------------- +--------------- +-------------- $--------------- - +--+ +
3. If all Scope Readings Compare to the Zero Track Chart
* ZERO TRACK ADJUSTMENT IS OK !! OK !! OK !! OK !!
* Press RETURN - Return To Menu
Displays Alignment Repair Main Menu
4. If any Scope Readings Do Not Compare to the Zero Track Chart
* ZERO TRACK MUST BE ADJUSTED !! ADJUSTED !! ADJUSTED !!
* * Refer to Zero Track Adjustment Procedures -- Page 1-22
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