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Apple M8347LL/A User Guide - Page 183

USB Printer Problems, Symptom/Cure Tables: System Problems After Startup - 51

UPC - 718908355039

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Troubleshooting Symptom/Cure Tables: System Problems After Startup - 51 USB Printer Problems This troubleshooting table deals with an iMac that cannot print to an attached, knowngood USB printer. Possible Cause Possible Fix Printer is not compatible with the iMac USB bus. Verify with the manufacturer of the printer that it is iMac compatible. Chooser is set incorrectly. Open the Chooser and verify that you have the correct printer and printer driver selected. Bad printer driver or hardware problem. Use Apple System Profiler to see if it recognizes that a USB printer is connected. Yes: Reinstall the printer driver. No: The printer or its cable is malfunctioning. Replace the cable or printer. Bad external USB port. If the printer is connected to a third-party hub, switch it to one of the iMac ports in the I/O panel. Does the printer work now? Yes: You have a bad third-party hub. Replace the device that contains the problem USB port or refer to the third-party documentation for troubleshooting procedures. No: Go to next step. Bad USB port on the iMac. If the printer is already connected to a USB port on the iMac, switch it to the other USB port. Does the printer work now? Yes: Replace the logic board. No: Go to next step. System software is corrupted. Perform a clean install of the system software using the Mac OS CD that shipped with the iMac. (You must use the system software CD that came with the iMac in order to get the correct version of Mac OS 8.1 with the appropriate iMac enablers.) Bad cable. Replace the printer interface cable. Bad logic board. Replace the logic board.

Section	Page
iMac (Early 2001)	1
Take Apart	2
Take Apart	2
iMac (Early 2001)	2
Marketing Reference: Winter 2000-2001	2
Version 2, 400 MHz Logic Board (June 2001)	3
Thermal Pad Replacement	4
Tools	6
Procedures	7
Bottom Housing With Flip Foot	7
Bottom Housing Replacement Note	12
EMI Cover	13
SDRAM DIMM	17
AirPort Card	20
CD/HD Carrier	25
CD-ROM / DVD- ROM/CD-RW	29
CD-ROM, DVD-ROM,CD- RW Module Replacement	34
CD/DVD/CD-RW Adapter Board	37
Hard Drive	39
Hard Drive Replacement	43
Logic Board	44
Thermal Pad Information	50
Thermal Pad Installation	51
Down Converter Board	53
Modem	59
Modem Replacement	63
I/O Panel	64
Front Outer Bezel	68
Top Rear Housing	73
Divider Panel	79
Power/Analog/Video Board	81
Identifying Power/Analog/ Video Boards	95
Switch Instructions	96
LG CRT	97
CPT CRT	98
Side Panels	99
Antenna	105
Speakers	113
Headphone Board	115
Power/LED Board	117
CRT	119
Replacing the CRT	121
CRT Notice, July 2005	121
Switch Settings for the LG CRT	124
Identifying the LG CRT	125
Identifying the CPT CRT	126
Microphone	127
Replacing the Microphone	130
Troubleshooting	132
Introduction	133
What’s New and Different:	133
Searching the Knowledge Base	134
Troubleshooting Procedures	135
Block Diagram	136
Power Flow	137
Testing for Power	138
At the AC Outlet	138
At the Logic Board	139
Testing the Power/Analog Board Fuse	142
The PMU Chip	143
Resetting the PMU on the Logic Board	144
Power-On Self Test	145
Logic Board Battery	146
Ejecting a CD or DVD Disc, Part 1	147
Ejecting a CD or DVD Disc, Part 2	148
HFS Plus Formatted Drives	149
Testing the Modem	150
Symptom/Cure Tables: Startup Problems Before the Finder Appears	152
Note: If you are instructed to replace a module and this does not fix the problem, be sure to rei...	152
No Power	153
No Video or Unstable Raster	155
Gray Screen	157
Error Beep(s)	158
Incompatible RAM is installed.	158
Bad RAM.	158
Flashing Question Mark	159
System Hangs During Boot	160
Symptom/Cure Tables: System Problems After Startup	162
Note: If you are instructed to replace a module and this does not fix the problem, be sure to rei...	162
System Hangs	163
Distorted Video	164
Thin White Line	165
Tinting Video	166
Garbage Video	167
Intermittent Shut Down or Sleep	168
Memory Error Dialog	169
Can’t Wake From Sleep	170
Network Problems	171
CD_ROM or DVD-ROM Vibration	172
CD-ROM or DVD-ROM Won’t Eject	173
CD-ROM or DVD-ROM Not Showing on Desktop	175
Hard Drive Problems	176
Sound Out Problems	177
Sound In Problems	178
Noise From Computer After Shutdown	179
USB Problems	180
USB device experiencing a partial lack of power.	180
Bad USB device.	181
Bad logic board.	181
Cursor Problems	182
USB Printer Problems	183
Networked Printer Problems	184
Modem Not Recognized	185
Modem Dialing Problems	186
Modem Not Connecting	188
Modem Dropping Connection	190
Modem Performance Issues	191
System Freeze Occurs When Sleeping iMac Connected to Internet	191
Adjustments	193
Important: Adjustment Information	194
Light Meter Setup	196
Model R77	197
Jumper Adjustment Tool	200
Installing the Jumper	201
Focus Adjustment	204
Screen Voltage	207
Cutoff Adjustment	214
White Balance	224
Geometry Adjustments	231
S Correction Adjustment	237
Upgrades	242
Memory	243
AirPort Card	248
Connect an External Monitor	254
Exploded View	257
iMac (Early 2001) Exploded View	258
iMac (Early 2001) Cable Locator	259
iMac (Early 2001) Screw Matrix	260
iMac (Early 2001) Colored Service Parts	261