Diagrams; Block Diagram; Schematic Diagrams And Printed Wiring Boards; Diagrams 4-1. Block Diagram - Compaq P900 Service Manual

SECTION 4

DIAGRAMS

4-1. BLOCK DIAGRAM

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861 Block Diagram.p65 1
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09/03/1999, 11:58 AM
4-2. CIRCUIT BOARDS LOCATION
N
H

4-3. SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS

Note:
• All capacitors are in µF unless otherwise noted. pF: µµF 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.
• : nonflammable resistor.
• : fusible resistor.
• : internal component.
• : panel designation and adjustment for repair.
• All variable and adjustable resistors have characteristic curve
B, unless otherwise noted.
• : earth-ground
• : earth-chassis.
• The components identified by in this basic schematic
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
necessary adjustments by using RV901 ( ) as indicated.
(See page 7)
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.
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P900
A
D
• When replacing parts shown in the table below, be sure to
perform the safety related adjustment.
Part Replaced ( )
HV ADJ
RV901
Part Replaced ( )
HV Regulator
D board T901, IC901, R924, R925,
Circuit
RV901
HV Protector
D board T901, R917, R918, R923, R920,
Circuit
R919, R1004, C920, D911,
D912
D board R933, R932, R921, R1006,
Beam Current
Protector D915, D917, IC901, T901
Circuit
• All voltages are in volts.
, make the
• Readings are taken with a 10 M W digital multimeter
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal production
tolerances.
• * : Cannot be measured.
• Circled numbers are waveform references.
• : B +bus.
• : B - bus.
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