Sinclair QL Service Manual

As Issue 5R40 R41 4K7 5%, 1/4W
R42 R43 4K7 5%, 1/4W
R44 R45 4K7 5%, 1/4W
R100 R101 2K2 5%, 1/4W
DIODES
D12 D13 1N4148
As Issue 5D14 D15 1N4148
D22 D23 1N4148 (2)
INTEGRATED CIRCUITS
IC29 IC30 2G007-Issue 3
As Issue 5
ULA Ferranti
IC31 IC32 78M05 +5V Regulator
MISCELLANEOUS
HBC1 HBC2 A10021 As Issue 5 2-off each 7-way flex. connector/cable
TABLE 5.5 FINAL BOARD ASSEMBLY
Circuit Ref ISSUE 5 ISSUE 6 Notes Rating/% Tol Manufacturer/Type
CAPACITORS
C1 32 pF
As Issue 5
5% Ceramic
C2 22 pF 5% Ceramic/TB
C4 4.7 pF 25V, -10%+50% Electrolytic/Axial
C19 47 nF 50V
C20 47 nF 50V
C21 22 µF 16V Electrolytic/Radial
C22 22 pF 16V Electrolytic/Radial
C23 22 pF 16V, -10%+50% Electrolytic/Axial
C24 22 pF 16V, -10%+50% Electrolytic/Axial
C25 22 µF 16V, -10%+50% Electrolytic/Axial
C26 0.01 pF 20% Ceramic/TB
C27 0.1 pF 50V, -20%+80%
C28 0.1 µF 50V, -20%+80%
C29 220 pF 10%
C30 220 pF 10%
C31 16 pF 22 pF 5% Ceramic
C32 0.01 µF
As Issue 5
20% Ceramic/TB
C33 0.1 µF 50V, -20%+80%
C34 47 pF 5% Ceramic/TB
C35 100 µF -10%, +80% Electrolytic/Axial
C36 47 nF 50V
C37 470 pF 25V, -10%+50% Electrolytic/Axial
C38 4.7 µF 16V Electrolytic/Radial
C39 470 µF 25V Electrolytic/Radial
C40 4.7 pF 16V Electrolytic/Radial
C41 0.33 pF 50V Electrolytic/Radial
C42 47 pF 10V Electrolytic/Radial
C43 0.1 µF 50V, -20%+80%
C44 0.1 µF 50V, -20%+80%
C45 1 nF 2% Ceramic
C46 0.1 µF 50V, -20%+80%
C47 22 µF 16V Electrolytic/Radial
C48 0.01 µF 20% Ceramic/TB
C53 NOT USED 22 pF 5% Ceramic
DC1-29 0.1 pF 0.1 µF 50V, -20%+80%
RESISTORS
R1-R6 3K3 5%, 1/4W
R7 330R 5%, 1/4W

Sinclair QL Specifications

General

Processor	Motorola 68008
Clock Speed	7.5 MHz
RAM	128 KB (expandable to 640 KB)
ROM	48 KB
Operating System	Sinclair QDOS
Release Year	1984
Storage	Microdrive tape loop
Graphics	256x256 pixels, 8 colors
Ports	RS-232, ROM cartridge
Sound	Beeper (internal speaker)