Apple PowerBook 520 Specifications download pdf (Page 177)

Additional Procedures AC Adapter Voltage Test - 5

AC Adapter Voltage Test

To test the AC adapter voltage:

• Use narrow test probes for the leads on your voltmeter.

• Make all measurements with the negative or common

lead touching the outer shield of the connector (ground).

• Use the following table to identify the connector pin

number, signal name, and DC voltage present.

Connector Pin Signal DC Voltage

1 VBATT 16.4–16.6V

2 VMAIN 16.4–16.6V

3 GND 0V

4 GND Sense 0V

1 2 ... 172 173 174 175 176 177 178 179 180

PowerBook 500 Series 1
General 3
Information 3
Repair Strategy 4
USA Ordering 5
Canadian Ordering 6
Warranty/AppleCare/ARIS 7
Rear Panel 8
PowerBook Cable Matrix 11
Battery Information 14
Battery Handling 15
Speciﬁcations 17
Introduction 18
Processor 19
Disk Storage 21
I/O Interfaces 22
I/O Devices 24
Sound and Video 25
PB 540c Video 26
Electrical 27
Physical 28
Environmental 29
Troubleshooting 31
Symptom Charts 33
Floppy Drive 42
Peripheral 46
Internal Modem 53
Miscellaneous 59
Flowchart 61
(continued) 62
Take Apart 63
Battery/PCMCIA 64
Battery Contact Cover 66
Keyboard 68
Clutch Covers 76
Display Access 79
Display Assembly 81
Board Cable 82
Interconnect-to-Logic 82
Center Base Cover 84
Screw Carrier 86
Floppy Drive Cable 89
Right Bracket 93
Daughterboard 95
EMI Shield 95
RAM Expansion Connector 99
Daughterboard Connector 99
Top Case 100
Small Screw 101
Trackpad Cable 103
Trackpad Cable Connector 103
Interconnect-to 107
Logic-Bd. Cable 107
Interconnect 108
CPU Stiffener 111
Left Side Panel 112
EMI Clip 115
Clutch Peg 115
Sound-In 117
Sound-Out 117
Standoff & Peg 117
Positioning Peg 119
Hard Drive Cable 120
Hard Drive 121
Cable 121
Door Peg 123
Take Apart Bottom Case - 62 125
• CPU stiffener 125
• Motherboard 125
Microphone 126
Assembly 126
Microphone Cable 127
Microphone Assembly 127
1 Using a small flat-blade 129
Backup Battery 130
Cable Connector 130
Backup Battery Cable 130
Cable Guides 130
Trackpad Actuator 134
Display Bezel 136
Speaker Cable 137
Display Cable 141
Inverter Board 143
Inverter Cable 144
Backlight 144
Interconnect-to-Display Cable 150
Connector 150
Display Rear 153
Upgrades 154
RAM Card 155
Expansion Connector 156
RAM Card Guides 156
Modem and DAA 159
Modem Cap 161
Modem Card 161
PCMCIA Module 165
Left Battery Bay 166
PB 540c Upgrade 168
Macintosh 170
PowerBook 170
Processor Card 170
Additional Procedures 172
Battery 173
Verification 173
Backup Battery Verification 175
AC Adapter Voltage Test 177
Power Manager Reset 178
Exploded View 179

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Apple PowerBook 520 Specifications Page 177

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