Amiga Troubleshooting Guide

SYMPTOMS U1U6U2U4U3U5U7U8U15U14HY1U40U41U37U38U39DRPSKBEM
13		EM
14		EM
15		U2X1
BLANK SCREEN
BLACK		 *   *                             *           *
BLANK SCREEN
GREEN		     *     *                     *           * 
BLANK SCREEN
WHITE		     *   *   *             *           *    * 
BLANK SCREEN
RED		   *                                            
GRAPHIC
PROBLEMS		     * *                                     * 
SYSTEM LOCKS UP
FREEZES		     * *     *             *                    
NO KEYBOARD RESET
CTRL AMIGA AMIGA		          *                         *          
WAVY SCREEN
NO SYNC		     *                   *                      
WRONG
COLORS		       *             * * *                      
JOYSTICK
PROBLEMS		       *         *                              
MOUSE
PROBLEMS		       * *   *   *                       *     
NO FIRE
BUTTON		             *                                  
NO RIGHT MOUSE
BUTTON		         *                                      
AUDIO
FAULTTS		         *         *                            
DISK DRIVE
FAULTS		 *   *   * * * *                                
KEYBOARD
TROUBLE		     *     * *                                  
SERIAL PORT
TROUBLE		         *     *             * *                
PARALLEL PORT
TROUBLE		             * *                           *   

Remove all external add ons: extra memory, hard drive, external disk drive, printer, modem. This eliminates them as a source of the problem. If the computer works normally when all the add ons have been removed, start adding devices on, one at a time, until the problem comes back. Then determine which is at fault, the device or the computer.

Substitute a known good disk drive and power supply so as to eliminate them as the source of the problem.

U1 - 68000U8 - 8520U38 - 1488EM 14- EMI 1401 5.1 ohm Res
U6 - ROMU15 - 74LS157U39 - 1489EM 15 - 1501 47ohm Res
U2 - FAT AGNESU14 - LF347DR - D RAMSU2 - U2 SOCKET
U4 - DENISEHY1 VIDEO HY1 RDPS - POWER SUPPLY X1 - X1 CRYSTAL
U3 - PAULAU40 - 74HCT 245KB - KEYBOARD 6570
U5 - GARYU41 - 74HCT 245EM 13 - EMI 1301 1ohm Res
U7 - 8520U37 - 74LS32