H/Z-100 Repair and Modification

General Notes:

  • Click on the images to magnify the view for detail.
  • Note the configuration and positioning of ALL cables for reassembly, particularly the marked edge of each ribbon cable.
  • Disassembly assumes you are facing the computer's rear as shown in the diagrams.
  • Reassembly is the reverse of the disassembly procedures.

 

Z120Ins
Z-120 All-In-One Computer Disassembly:

  • The cover is removed by moving the cover's two metal slides about 1/4" to the rear and lifting the cover off the base.
  • Remove 5 long screws holding the middle base to the bottom base unit.
    • Two hex-head machine screws on each side (4 total).
    • An additional hex-head sheet metal screw on the left side  toward the front
  • Note the configuration of the ribbon cables and power cables, particularly the marked edge of the ribbon cables for reassembly.
  • Remove the ribbon cables from the rear of the floppy drive(s).  The marked edge is to the left side of the computer.
  • Remove the power cables from the floppy drive(s).

 

Z110Ins2

 

Z-120 All-In-One Computer Disassembly, continued:

  • If a hard drive is installed:
    • Remove the 3-wire power supply cable from the Data Separator Card mounted on top of the hard drive.
    • Remove the ribbon cables from the rear of the hard drive. The marked edge is to the right side of the computer.
    • Remove the power cables from the hard drive.
  • Remove the power cable from the video driver circuit board mounted vertically on the right side of the computer.
  • Lift the entire Drive/Video Subassembly clear of the computer base and set aside.
  • Once the CRT/Drive Assembly is removed, the Z-120 and Z-110 are very similar; the most obvious difference remaining is the shape of the power supply case. The power supply itself is very similar between the two models, except for two additional wires for the CRT.
  • Skip the Z-110 Low-Profile Computer Disassembly procedures.

 

Z110Ins

Z-110 Low-Profile Computer Disassembly:

  • The cover is removed by moving the cover's two metal slides about 1/4" to the rear and lifting the cover off the base.
  • Remove the screws holding the black drive subassembly to the bottom base unit:
    • Two pan-head sheet metal screws on each side (4 total).
    • A hex-head pin machine screw in the center hole on each side (2).
  • Remove the screws holding the plastic base unit cover to the computer base.
    • A pan-head sheet metal screw on each side at the front (2).
    • A hex-head pin machine screw on each side at the rear (2).
  • Note the configuration of the ribbon cables and power cables, particularly the marked edge of the ribbon cables for reassembly.
  • Lifting the Drive Subassembly slightly, remove the ribbon cables from the rear of the floppy drive(s). The marked edge is to the left side of the computer.
  • Remove the power cables from the floppy drive(s).

 

Z110Ins2

 

Z-110 Low-Profile Computer Disassembly, continued:

  • If a hard drive is installed:
    • Remove the 3-wire power supply cable from the Data Separator Card mounted on top of the hard drive.
    • Lifting the Drive Subassembly slightly, remove the ribbon cables from the rear of the hard drive. The marked edge is to the right side of the computer, toward the power supply.
    • Remove the power cables from the hard drive.
  • Lift the entire Drive Subassembly clear of the computer base and set aside.

 

Z100Base

 

Disassembly of Base

The base of both computers is essentially identical. The card cage at the rear holds the floppy and hard drive controller cards, additional memory Z-205 boards, serial port Z-204 boards, or other boards that use a standard S-100 buss system. All five slots are identical, so any board can go in any convenient slot.

  • To remove boards from the card cage, rotate the pair of white pry bars located on the top of most S-100 boards toward the outside of the cage, prying the board from its socket.
  • To gain access to the motherboard, remove three screws holding the video board and lift up the video board as shown.
  • To remove the video board, remove the two 40-pin ribbon cables from the motherboard and any cables attached to the video board's left edge.

 

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