Compaq D-1H Circuit Boards Location, Schematic Diagrams And Printed Wiring Boards, A H S U1 D U2

5-2. CIRCUIT BOARDS LOCATION

A

H

S

U1

D

U2

5-3. 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.

•f : nonflammable resistor.

•F : fusible resistor.

•Δ : 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 [ 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 ], make the necessary adjustments by using RV501 ([) as indicated. (See page 10Z)

Note: The components identified by shading and mark Á are critical for safety. Replace only

with part number specified.

Note: Les composants identifies per un trame et une marque Á sont critiques pour la securite. Ne les remplacer que par une piece portant le numero specifie.

•When replacing parts shown in the table below, be sure to perform the safety related adjustment.

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

•All voltages are in volts.

•Readings are taken with a 10 ΜΩ 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.