Apple LC520 Specifiche Scaricare il pdf (Pagina 36)

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Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 18

Miscellaneous

(Continued)

“Sad Macintosh” icon 1 Replace bad disk with known-good disk.

2 Disconnect internal and external IDE or SCSI devices. If the

flashing “?” appears, re-attach devices one at a time.

Troubleshoot software issue on device that produces problem.

3 Replace RAM SIMMs on logic board.

4 Replace logic board. Retain customer’s SIMMs.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 175 176

Macintosh LC 520/550/575 1
Service Source 2
Macintosh LC 520, 550, 575 2
Product Information 4
Compatibility Notes 5
Disk Storage 10
I/O Interfaces 11
Communications 12
Slot (LC 575) 12
I/O Devices 13
Sound and Video 14
Electrical 15
Environmental 17
Troubleshooting 18
Symptom Charts 20
Floppy Drive 26
Hard Drive 29
CD-ROM Drive 30
Peripheral 31
Miscellaneous 34
Take Apart 37
Rear Housing 38
Take Apart Fan - 5 42
Push out the two latches and 42
Analog Board 43
Take Apart Analog Board - 8 45
2 Disconnect the internal 45
Retainer 46
I/O Door 49
Take Apart Logic Board - 15 52
Pull out the logic board 52
Drive Bezel 53
Take Apart Floppy Drive - 20 57
Push down the latch and pull 57
Macintosh LC 520 58
Auto-inject Floppy 58
Auto-inject 59
Drive Carrier 59
CD Connector 64
CD Audio Adapter 64
Adapter 64
Take Apart Hard Drive - 31 68
1 Push down the latch and 68
Chassis Harness 71
Assembly 71
±Warning: Never use a 72
Background 73
922-0557 75
922-0117 Screw 76
EMI Shields 77
Speaker Assembly 78
Speaker Wires 79
Front Panel Control Board 81
Logic Board Connector 87
±Warning: This product 92
Take Apart CRT - 56 93
2 Lift off the CRT 93
Replacement Note: Be sure 93
Internal 94
Microphone 94
Front Bezel 96
Upgrades 98
Macintosh 99
Processor Upgrade 99
Installation Procedure 105
Overview 105
Remove the 68LC040 107
Processor from the 107
Logic Board 107
Removal Tool 108
Logic Board Socket 108
Processor 108
Install the 68LC040 110
Processor on the 110
Upgrade Board 110
Processor 111
Prepare the Upgrade 114
Installation 114
Antistatic Foam 115
Bottom Side 115
EMI Clips 115
Hook-and-Loop 117
Fastener 117
Logic Board and 122
Additional Procedures 123
Negative 125
Positive 125
Battery 131
Replacement, LC 131
Connector 132
Geometry 134
Vertical Center 136
Horizontal Center 137
Vertical Size 138
Horizontal Size 139
WARNING: 141
High Voltage Areas 141
Gray Bars 144
Contrast Up Button 144
Convergence 155
Crosshatch I 156
Geometric 158
Distortion 158
Horizontal Bow 160
Pin Phase 160
Vertical Angle 160
Yoke Clamp 163
Plastic Yoke Collar 163
Light Meter Setup 169
Model L-248 173
Model 246 174
Exploded View 175

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Apple LC520 Specifiche Pagina 36

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