Circuit Boards Location; Schematic Diagrams And Printed Wiring Boards - Compaq D-1H Service Manual

5-2. CIRCUIT BOARDS LOCATION

S

5-3. SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS

Note:
• All capacitors are in
50 WV or less are not indicated except for electrolytic.
• Indication of resistance, which does not have one for rating
electrical power, is as follows.
Pitch: 5 mm
Rating electrical power 1/4 W (CHIP: 1/10 W)
• All resistors are in ohms.
f
• : nonflammable resistor.
F
• : fusible resistor.
• : internal component.
p
• : panel designation and adjustment for repair.
• All variable and adjustable resistors have characteristic curve B,
unless otherwise noted.
e
• :
earth-ground.
E
• :
earth-chassis.
•
The components identified by
diagram have been carefully factory-selected for each set
in order to satisfy regulations regarding X-ray radiation.
Should replacement be required, replace only with the
value originally used.
• When replacing components identified by ], make the necessary
adjustments by using RV501 ([) as indicated. (See page 10Z)
Note: The components identified by shading and
¡
mark are critical for safety. Replace only
with part number specified.
Note: Les composants identifies per un trame et une
¡
marque sont critiques pour la securite. Ne les
remplacer que par une piece portant le numero specifie.
A
H
D
U2
F unless otherwise noted. pF:
[
in this basic schematic
D1
U1
F
•
When replacing parts shown in the table below,
be sure to perform the safety related adjustment.
•
All voltages are in volts.
•
Readings are taken with a 10
•
Readings are taken with a color-bar signal input.
•
Voltage variations may be noted due to normal
production tolerances.
•
•
Circled numbers are waveform references.
•
•
D - BOARD
Part Replaced ([)
RV501
Part Replaced (])
RV501, T501, R545, R546, R548,
R550, R547, R549, R552, D517,
IC605, IC901, C540, C542, C544,
C541, C535, IC501, C558, R567,
R564, C555, C553, C554, C561
* : Cannot be measured.
: B +bus.
: B - bus.
digital multimeter