Battery Replacement

Before you begin, remove the logic board. Awarning If handled or discarded improperly, the lithium battery in the computer could explode. Review battery handling and disposal instructions in Bulletins Safety. Caution Review the ESD precautions in Bulletins Safety. Insert a small flat-blade screwdriver into the top of the battery holder cover and gently push down and out with the screwdriver to release the tab. Repeat on the other end and remove the cover from the battery holder. Grasp the...

Degauss Coil

Degaussing Coil

Disconnect the microphone cable Awarning This product contains high voltage and a high-vacuum picture tube. To prevent injury, review Coil CRT safety and discharge instructions in Bulletins Safety. Never use a grounding wriststrap until after discharging the CRT. 1 Remove the degauss coil cable from the tie-wrap at the side of the CRT yoke. 2 Lift the degauss coil with attached brackets over the neck of the CRT. Replacement Note When replacing the degauss coil, be sure to reattach the ground...

Chassis

Mac Color Classic Chassis

Warning This product contains high voltage and a high-vacuum picture tube. To prevent injury, review CRT safety and discharge instructions in Bulletins Safety. Never use a grounding wriststrap until after discharging the CRT. 1 Open the two release tabs on one side of the chassis and raise that side of the chassis. 2 To keep the side of the chassis raised, insert a small flat-blade screwdriver between the chassis and the bezel. 3 Using a small flat-blade screwdriver, pry open the two release...

White Balance

The Gray Bars test pattern is displayed. Contrast is set to maximum. Brightness is set to midrange. 2 Using a hex-head plastic adjustment tool, alternately adjust the red, green, and blue background controls until there is no predominant color in the four darkest bars. Note The darkest bar must remain completely black throughout the rest of the procedure. If you notice a predominant color in the darkest bar, readjust the appropriate background control. 3 If necessary, adjust the blue and green...

Rear Housing

No preliminary steps are required before you begin this procedure. Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious personal injury or equipment damage, review CRT safety and discharge instructions in Bulletins Safety. 1 Using a long-handled Torx screwdriver, remove the four case screws. If necessary, remove the two security screws from the I O door. 2 Using a case spreader pull-apart tool , separate the housing from the chassis. Carefully lift the...

Math Coprocessor

Before you begin, remove the logic board. Caution To prevent ESD damage to components, wear a grounding wriststrap and use a grounded workbench pad. Review the ESD precautions in Bulletins Safety. Adding a Motorola 68882 math coprocessor to the logic board in the Color Classic increases overall system performance. 1 Position the math coprocessor over socket U9 with the beveled edge of the chip toward the large contact connector J13 at the front of the board. 2 Align the pins in the socket and...

Analog Board

Emac Analogic Board Diagram

Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious personal injury or equipment damage, review CRT safety and discharge instructions in Bulletins Safety. Never use a grounding wriststrap until after discharging the CRT. 1 Unhook the video board ground wire from the CRT grounding strap. Replacement Caution When replacing the analog board, be sure to securely reconnect the ground wire to the CRT grounding strap. Switching on system power without...