Philips PM2521 Service Manual page 7

06
5.
PARTS
LIST
89
5.1.
Top
cover assembly 89
5.2.
Bottom
cover
assembly
89
5.3.
Front assembly 89
5.4.
Switch assembly 89
5.5. Printed
circuit
board
90
5.5.1.
Miscellaneous 90
5.5.2.
Resistors 91
5.5.3. Capacitors
94
5.5.4.
Semi-conductors 96
5.5.5. Integrated
circuits
98
6.
CIRCUIT
DIAGRAMS
AND
P.C.B.
LAY-OUT
99
7.
MODIFICATIONS TO THE
PM2521
115
7.1.
Modifications to
circuit
diagrams and
p.c.b.
lay-outs
115
7.2.
Modifications to
components
120
7.3.
Modifications
to the adjusting procedure
120
8.
COMPONENT DATA
121
8.1.
Semi-conductors
121
8.2.
LOCMOS
circuits
(HEF)
122
8.3.
OQ
circuits 127
8.4.
Display
interface
circuits
133
8.5. Operational amplifiers 137
8.6.
Low
power
Schottky
circuits
(LS) 139
8.7.
Memory
and
microprocessor
143
8.8.
Resistors 146