Philips pm2521 - 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