Macintosh PowerBook 100
The PowerBook 100 replaced the Macintosh Portable as a more practical laptop design. This model is considered to be a sub-notebook from the compact design and lack of internal removable media.
The PowerBook 100 is powered by a 16MHz Motorola 68000 processor.
Opening your PowerBook 100 ========================== WARNING: The PowerBook 100 is extremely fragile internally, and must be treated with extreme care to avoid an expensive repair bill. If you're not sure what you're doing, don't do it! If you break it, it's your responsibility! You MUST back up the RAM disk as this will be lost. You are strongly recommended to back up the hard disk as well. Memory and disk drives are very fragile and must not be removed from their anti-static packaging until you are grounded via an anti-static mat and wristband. DO NOT attempt to reinsert batteries until the machine is fully assembled and screwed together. You will need: - Static mat with wristband and earth connection - Clean tea-towel - Jeweller's flat bladed screwdriver, smallest available - 45 degree point Philips screwdriver - Small flat bladed screwdriver Notes on removing flat cables from sockets ------------------------------------------ The socket is in two parts which are pushed together to lock the cable in place. To remove the cable, use your fingernails to pull on the two lugs at either side of the socket (in the direction of the cable, not upwards) with equal force until it clicks out about 1-2mm. The cable may now be removed with an even pull. When inserting, make sure the end of the cable goes all the way into the socket and support it so that it does not buckle. PowerBook Disassembly --------------------- Disconnect your PB100 from all peripherals, power supply etc. Put your PB on a static mat. Wire the mat to mains earth. Put on the mat's wristband to earth yourself. Close and latch the PB. Remove the lithium batteries and put aside. Remove the lead acid battery (use thumbnail in gap) and put aside. Turn PB upside down. Gently prise out the three round feet with the jeweller's screwdriver without damaging them. Put aside. Unscrew the three long Philips screws which were under the feet. Put aside. Turn PB over. Release latch and gently and slowly lift up the display. When it is clear of the body, lay it down screen up behind the machine being extremely careful not to stress the wires. If the display unit is to be disassembled, see below for details. Lay the tea towel over the display. Disengage the palm rest from the front of the case and the keyboard. Remove the palm rest and put it aside. Flip the keyboard over and lay it upside down on the tea towel. Be very careful not to stress the flat cables. Installing a New Memory Module ------------------------------ If there is a memory module already installed, it must be removed first. To remove the old module, it must be levered out very carefully using a wooden or plastic spatula placed between the memory module and the motherboard. Do not use a screwdriver. Remove the new memory module from its anti-static bag and seal the old module (if any) inside it for safe keeping. Check the pins on the motherboard connector to ensure they are straight. Line the new module up with the connector (at the left hand end of the keyboard area). Press down firmly on the connector site until it is fully seated. Upgrading the Disk Drive ------------------------ The brackets and screws for the Apple 20MB and 40MB hard drives are NOT the same. Make sure you have the right brackets and screws before proceeding. Apple part numbers are as follows: Apple P/N Description UK Price --------- ----------- -------- 948-0149 Apple PowerBook 100 HD20 Mounting Brackets #1.43 948-0157 Apple PowerBook 100 HD40 Mounting Brackets #1.47 076-0557 Apple PowerBook 100 Universal Screw Kit #0.49 Gently lift up the metal shield to reveal the flat cable connector. Unlock and remove the flat cable (see above). The hard drive has two spring steel brackets attached to it which hold it in place. Use a small flatbladed screwdriver to bend the right hand ends of the brackets towards the drive, while lifting the right hand end of the drive up slightly with your fingertips. The result should be that the brackets disengage from under the protrusions in the lower case moulding. When both brackets are disengaged, lift the right hand end of the drive up and out; the left hand ends of the brackets should slide out from their sockets and the whole drive should lift out. Very gently prise the SCSI connector away from the drive by inserting a small flatbladed screwdriver between the black plastic connector on the cable and the black plastic block on the drive. Do not attempt to pull it off using the cable, which will probably be damaged. Remove the new drive from its anti-static and anti-vibration packaging and pack the old drive in it for safe keeping. Fit the new brackets and screws to the new drive. Be very careful to use the proper screws. Installing the new drive is fairly obvious once you have removed the old one. Be sure to fully insert the flat cable with the motherboard connector held fully open, then fully lock the motherboard connector by pressing on both ends simultaneously until the two halves are at the same height. Do not put any pressure on the flat cable itself. Disassembling the Display Unit ------------------------------ Normally you should never need to do this. Apple say any little black bits in the LCD are normal, and there isn't a separate filter - the LCD is all one sealed unit. If you have noisy pots (display brightness flickers etc.) gently prise off the knobs with a flat bladed screwdriver and spray them with switch cleaner. However, if you must... Carefully unplug the display from the main unit. Be sure to only apply force to the connector body, not to the thin wires coming out of it (which will break if you do). Put the main unit somewhere safe. Unscrew the four large silver bolts which pass through the silver hinge plates and put aside. Pull off the grey plastic hinge covers, but be careful not to get grease on your fingers - if you do, clean it off before smearing it all over everything. Using a flat bladed screwdriver, very gently disengage the grey tabs holding the tunnel to the lower hinge moulding. This will pop out. Prise off the contrast and brightness knobs with a flat blades screwdriver, and prise out the two little rubber screw caps from the front bezel (one is very near the knobs). Unscrew the black screws thus exposed with the right size screwdriver - be careful not to damage the heads. Looking at the lower edge of the display unit, you will see two little tabs preventing the top bezel from sliding down with respect to the rest of the unit. Insert a small screwdriver to disengage these tabs while applying gentle downwards pressure to the bezel. After a bit of fiddling the bezel will slide downwards and disengage. The display may be removed by undoing the four black screws, lifting up VERY GENTLY - there are short flat cables underneath - disengaging the latches (see above) and removing the cables. Unplug the fluorescent lamp at the inverter PCB. Reassembly ---------- If the display unit has been disassembled, reassemble this first. Be very careful not to damage the tabs on the tunnel and not to get grease everywhere from the hinges. Carefully engage the palm rest. If the drive has been changed, make sure the palm rest goes into place properly; if the drive has not been installed correctly it will flex the plastic upwards in the drive area; this must be put right before the unit can be reassembled. Very carefully engage the keyboard without stressing the flat cables. Hook the two tabs at the front under the palm rest. Remove the tea towel, then carefully engage the display with the lower half. When this is done, close and latch the display half. Turn the unit over and reinsert the screws. Reinsert the three feet and make sure they are secure. Reinsert the lead acid battery followed by the three lithium batteries, which should be carefully polished beforehand on the tea towel to remove any contamination from your fingers. Make very sure you put the lithium batteries in the right way round - if you insert them upside down you will destroy your PowerBook. Testing ------- Power the machine up and see if it boots. If you have replaced the drive you may need to install a system on it using the floppies provided with your PowerBook. Be sure to power off before connecting the floppy drive. Check "About this Macintosh..." on the File menu and see if the Total Memory corresponds with what you have installed. Opening your PowerBook 100 External Floppy Drive ================================================ Parts required: Very small jeweller's flat bladed screwdriver Disconnect your drive from your PowerBook. Plug yourself into an earthed static mat via a wrist band. Open the front flap and remove it by flexing it very carefully until one of the two grey plastic pips disengages from its black plastic socket. Put the flap aside. Using the jeweller's screwdriver, insert it into the rectangular slot next to one of the black plastic sockets and pry the socket out. It should come out very easily with no damage to the socket or the case. Do the same on the other side. These sockets lock the two halves of the case together and prevent them from sliding apart. The top half of the case will now slide about 1cm and lift off. If you wish to remove the metal shield from the top of the drive, use the jeweller's screwdriver to free each of the metal lugs. Be careful not to distort it or to damage the drive underneath. The flat cable may be disconnected - see above. (c) 1992 Tim Steele, all rights reserved. These instructions may only be reproduced with this copyright notice, and may not be sold or form part of material which is sold. They may be distributed free of charge by electronic or other means. Under no circumstances is the author responsible for any errors in these instructions or any damage which may result from following them.
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