Apple Disk II Technical Procedures

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Disk ][ Analog Card rev. Jun 84 Page 5.10
SYMPTOM IC LOCATIONHead does not move 2003 D4Disk does not turn 2003 D4Recalibrates repeatedly 3470BlI/O ERROR 347 0 Bl3146 A374LS125 B4" " 2003 D4If you have replaced all of the ICs on the analog card andthe catalog still does not display, perform the COMPARATOROFFSET ADJUSTMENT located in the calibration procedures ofthe Disk ][ Technical Procedures section. If the analog cardstill fails to function properly, place all original ICs intheir sockets and return the card to Apple.Drive Has Trouble WritingIf the analog card correctly displays the catalog of drive 2,perform the following steps:1. Boot the DOS 3.3 System Master diskette in drive l, andthen move it to drive 2.2. Type CATALOG,D2 and press . The catalog will bedisplayed on the video screen. Files displayed with anasterisk (*) preceding the filename are locked and maynot be deleted. Note that filename HELLO is preceded byan asterisk.3. Type UNLOCK HELLO and press .4. Type CATALOG,D2 and press . The catalog will bedisplayed on the video screen. Verify that filenameHELLO is not preceeded by an asterisk. If you encountertrouble when attempting to unlock the file, turn off thepower to the computer and replace the following devices(except those which have been replaced previously), oneat a time, repeating this test after each device untilthe UNLOCK command executes successfully:- IC at B4 (labelled 74LS125)- IC at D4 (labelled 2003)- IC at A3 (labelled 3146)Disk ][ Analog Card rev Jun 84 Page 5.11
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DISK ][ TECHNICAL PROCEDURESTABLE O
Page 5 and 6:
A. REMOVING THE DISK DRIVE COVER1.
Page 7 and 8:
B. REPLACING THE DISK DRIVE CABLERe
Page 9 and 10:
C. REPLACING THE ANALOG CARDRemovin
Page 11 and 12: D. REPLACING THE COLLET HUBRemoving
Page 13 and 14: Disk ][ Technical ProceduresSection
Page 15 and 16: A. COLLET HUB ADJUSTMENTIf the disk
Page 17: B. DRIVE DOOR ADJUSTMENTWhen the di
Page 20 and 21: D. DRIVE SPEED ADJUSTMENT — THE D
Page 22 and 23: disk ][ adjustments rev. 8-31-82 pa
Page 25: Disk Drive Technical ProceduresSect
Page 28 and 29: B. AMPLITUDE TESTThe amplitude test
Page 30 and 31: 13. After the test signal has been
Page 32 and 33: Disk Safety Check5. Set the oscillo
Page 34 and 35: 16. Turn the oscilloscope's trigger
Page 36 and 37: The Test:7. Boot the Calibration (o
Page 38 and 39: E. HEAD RADIAL ADJUSTMENTThe Head R
Page 40 and 41: The Test:13. Change the oscilloscop
Page 42 and 43: ALPS Drive adjustment:23. Adjust th
Page 44 and 45: F. COMPARATOR OFFSET ADJUSTMENT:The
Page 46 and 47: 13. After the test signal has been
Page 49: Disk ][ Technical ProceduresSection
Page 53: Disk ][ Technical ProceduresSection
Page 56 and 57: Disk ][ Analog Board rev. Jun 84 Pa
Page 64 and 65: Disk ][ Analog Card rev. Jun 84 Pag
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Apple Disk II Technical Procedures

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