Z70830 ISSUE 1 Motherboard
Component names from the Z70830 Schematic.
A wire link is made between IC14 Pin 1 and IC20 Pin 13 on the solder side of the board.
R38 and C51 are soldered on the copper side of the board.
- R38 (1.5kΩ) is soldered between IC20 Pin 11 and the via directly behind IC19.
- C51 (22nF) is soldered between the via directly behind IC19 and the GND side of C12 (rear lead)
D36, D37, and D38 are soldered on the copper side of the board.
- D36 and D37 are soldered in antiparallel between the Base of TR4 (middle pin) and the negative side of C41 (forward lead)
- D38 is soldered between the negative side of C41 (forward pin) and the GND side of C37 (forward pin)
C52 is soldered on the copper side of the board.
- C52 is soldered between IC5 Pin 16 and IC5 Pin 18.
Z70833 ISSUE 1 Motherboard
Modifications made to some ISSUE 1 boards.
Component names from the Z70833 ISSUE 1 Schematic
Resistor R45 is deleted
A wire link is made between the right hand pad of R45 and Pin 4 of IC15 on the component side of the board.
A wire link is made between Pins 3 and 6 of IC15 on the component side of the board.
A 330pF capacitor is soldered between Pins 5 and 7 of IC15 on the component side of the board.
Z70833 ISSUE 2 Motherboard
Component names from the Z70833 ISSUE 2 Schematic
C53 absent on some boards.
A 100pF capacitor is soldered between 5 volts and D6 on some motherboards. Sometimes soldered between Pins 10 and 11 of IC2 on the IC legs. Sometimes soldered between Pin 10 of IC2 and Pin 20 of IC14 on the solder side of the board.