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Apple imac 20 inch mid 2009 User Manual

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Page 171

iMac (20-inch, Early/Mid 2009) Take Apart — Mechanism 171 2010-11-24
Removal
1 
Remove T10 screws: 
(4) 922-8849
2 Peel back EMI mesh 
tape on mechanism.
3 Lift mechanism off 
chassis.  

Page 172

iMac (20-inch, Early/Mid 2009) Take Apart — Chassis 172 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
•  Power Supply
•  Hard Drive
•  Hard Drive Fan
•  Hard Drive Data Cable
•  Optical Drive
•  Optical Drive Fan
•  Mechanism Cover
•  Stand
Tools
• ESD wrist strap
•  Torx T10 screwdriver
Chassis  

Page 173

iMac (20-inch, Early/Mid 2009) Take Apart — Chassis 173 2010-11-24
Removal
1 
Slide AC connector 
out from under the 
pressure wall.  The 
pressure wall does 
not need to be 
removed.
2 Remove T10 screws: 
(3) 922-8250, at top; 
slightly longer, slightly 
larger head 
(6) 922-6850 
(1) 922-7069, ground
Reassembly Note:  
Secure green/yellow 
grounding cable from 
AC inlet to chassis 
with short, stubby 
ground screw.  

Page 174

iMac (20-inch, Early/Mid 2009) Take Apart — Chassis 174 2010-11-24
3 If mechanism is still 
installed, peel back 
EMI mesh tape on 
mechanism attached 
to rear housing. 
 
Note: Mechanism 
can stay attached 
to chassis if you 
removed them to get 
to lower modules.
4 Lift chassis out of rear 
housing.
Reassembly
Reassembly is an exact 
reversal of the steps, with 
two notes:
1 Make sure the DC 
power supply/ SATA/ 
inverter cable is 
properly routed in 
rear housing before 
replacing chassis.  
Position...

Page 175

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 175 2010-11-24
First Steps
Remove:
• Access Door
•  Glass Panel
•  Front Bezel
•  LCD Panel
•  Right Speaker
•  Logic Board
•  Power Supply
•  Hard Drive
•  Hard Drive Fan
•  Hard Drive Data Cable
•  Optical Drive
•  Optical Drive Fan
•  Mechanism Cover
•  Stand
•  Chassis
Tools
• ESD wrist strap
•  Torx T10 screwdriver
Cable, DC,  
Power Supply/SATA/Inverter  

Page 176

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 176 2010-11-24
Removal
1 
Tape microphone 
cable to top of rear 
housing, to keep it 
out of the way
2 Disconnect inverter 
cable.  

Page 177

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 177 2010-11-24
3 Remove clear Kapton 
tape securing DC 
power cable to rear 
housing.
4 Remove T10 screw on 
cable guide in middle 
of rear housing: 
(1) 922-6800  

Page 178

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 178 2010-11-24
5 Before removing 
cable, note how it 
routes between black 
guideposts in rear 
housing.
Reassembly
1 
Install DC power cable 
into rear housing 
as shown above in 
removal step 5.
2 In top left corner of 
rear housing, position 
cable between black 
guideposts and 
secure cable with 
clear Kapton tape.  
Route inverter power 
cable off to the right.  

Page 179

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 179 2010-11-24
3 In the middle of rear 
housing, continue 
laying cable between 
black guideposts and 
secure cable with 
clear Kapton tape.
4 Position plastic cable 
guide (with foam) 
over the cable.
5 Replace T10 screw: 
(1) 922-6800 
Note: Make sure cable 
guide is flush with 
rear housing.  If cable 
guide is not seating 
properly, double 
check that cable is 
situated properly 
between black 
guideposts.  

Page 180

iMac (20-inch, Early/Mid 2009) Take Apart — Cable, DC,  Power Supply/SATA/Inverter 180 2010-11-24
6 Toward bottom of 
rear housing, continue 
laying cable between 
black guideposts and 
secure cable with 
clear Kapton tape.
7 Secure inverter cable 
to rear housing with 
clear Kapton tape.
8 Reconnect cable to 
inverter.
9 Continue with 
reassembly of chassis 
and other removed 
modules.  
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