Commodore AMIGA Technical Manual page 5

AM IGA 1000 ASSEMBLY LEVEL REPAIR
Required Equipment:
Kickstart Disk
Workbench Disk
Workbench Dealer Demo Disk
Blank Disk or Disk for Testing
Monitor
RAM Expansion Cartridge 1050
Mouse or Keyboard
Known Good Drive
Known Good PCB
Oscilloscope
OPTIONAL: Service Diagnostic Aide
1.2 PRELIM IN ARY NOTES
, If a SOFTWARE PROBLEM is suspected, verify that the software package operates
^CORRECTLY ON A " Known Good" system before beginning test on the
'• "Suspected Bad" system.
1.2.1 When the system is POWERED-DOWN, it should be left OFF for at least 5 seconds before
it is powered up again.
IF THIS IS NOT DONE, THE AC POWER SWITCH MAY FAIL.
Whenever possible, RESET the system by depressing the "CNTRL" key and both " A " keys,
simultaneously.
1 .2 .2 It may be necessary to insert a diskette MORE THAN ONCE before it is seated correctly
in the drive. Continued difficulty in correctly seating the disk indicates a defective or incom­
patible disk or a drive mechanical problem.
1 .2 .3 NEVER remove a disk when the DISK ACCESS LED is ON. Damage to the disk may
result. If the system LOCKS-UP, RESET it by depressing the "CNTRL" key and both " A "
keys, simultaneously.
1 .2 .4 If a PCB is replaced, ALL case and shield screws must be re-installed.
IF SCREWS ARE MISSING, EXCESSIVE RF NOISE MAY RESULT.
1 .2 .5 The GROUND STRAP on the drive assembly must be connected when the disk is being
accessed.
IF THE GROUND STRAP IS NOT CONNECTED, READ/WRITE ERRORS MAY OCCUR.
1 .2 .6 If the system LOCKS-UP when the keyboard is disconnected and connected, it may
indicate a defective keyboard.
1 .2 .7 System functions that are displayed as GHOST functions are NOT OPERATIONAL at
this time. An attempt to use those functions may appear to be a malfunction of the system.
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