Commodore 1581 - Verify Command

1581 ALIGNMENT/REPAIR TEST
VERSION 1.5.1
ALIGNMENT/REPAIR TEST OPTION SIX - SIDE SELECT LOGIC
The Side Select Logic Test checks for proper operation of the Drive Side
Select Logic by turning each Head, (Upper and Lower), on individually.
SIDE SELECT LOGIC OPTION MENU
* Press (0) - Select Side [0] (Lower)
* Press (1) - Select Side [1] (Upper)
* Press RETURN - Return to Menu
Displays Alignment/Repair Main Menu
Use a Scope or Meter to verify the Measured Signal with the
Expected Signal from the Side Select Control Logic Chart.
+ a nw a a nn wn nn nn wn wn wn wn nn wn wn wn wn wn wn wn wn wn wn a a a a a rrr rrr +
| 1581 SIDE SELECT LOGIC CHART |
fonnennn-== $n — +------------- +------- $a nen en +
| SIDE | CHECK IC | EXPECTED | SCOPE | INCORRECT SIGNAL |
SELECTED PINS SIGNAL MODE PROBABLE FAILURE
$----------- +----—---------- +—------------- $------- $-------- +
| 0 | U5 - 2 | LOW | DC | U5 - Ull |
0 Ull - 4 LOW Dc Ull - BAD DRIVE
+----------- +-------------- $e +------- $-------------—-—------~---- +
1 U5 - 2 HIGH DC U5 - U1l
1 Ull - 4 | HIGH | Dc | Ull - BAD DRIVE |
+------~----- $2222 $------------- +------- $-——---------~----------~- +
ALIGNMENT REPAIR/TEST OPTION SEVEN - LOAD DIAGNOSTIC MENU
* Insert Version 1.5 Diagnostic Diskette
* Press (8) -— Load from Device Number [8]
* Press (9) - Load from Device Number [9]
*
Press RETURN - Return To Menu
Displays Alignment/Repair Main Menu
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