YBA DESIGN P1000 Manual de usuario

P1000 AMP (stereo and mono) SERVICE MANUAL

Rev 1.0

For more information on BA products, please visit www.yba.fr

For support on BA products service or spare parts, please contact [email protected]

CONTENTS

1. Schematic of the amplifier PCB

p.3

2. Layout of the amplifier PCB

p.4

3. Assembly of the amplifier PCB

p.6

4. AMP1000 Stereo assembly

p.8

5. AMP1000 Mono assembly

p.9

6. Bias setting

p.10

7. Known issues

p.11

I. Schematic of the amplifier PCB

II. Layout of the amplifier PCB

Part list :

Capacitor 150pF (x3)

R SETA 0.56W (x16)

R SETA 10W (x2)

Trimmer 1k (x1)

R BA 110 (x7)

R BA 500 (x1)

R BA 1k2 (x5)

R BA 1k8 (x1)

R BA 2k2 (x2)

R BA 3k3 (x3)

R BA 4k7 (x2)

R BA 10k (x4)

R BA 47k (x2)

Transistor 2N5551 (x2)

Transistor 2N5401 (x2)

Transistor 2N5416 (x1)

Transistor 2N3440 (x1)

Transistor MJE15030 (x3)

Transistor MJE15031 (x2)

Transistor MJ15024 (x8)

Transistor MJ15025 (x8)

Capacitor 10µF 100V (x3)

Capacitor 0.1µF (x1)

Capacitor 0.33µF (x7)

Capacitor 100µF 100V (x5)

Capacitor 470µF 63V (x2)

Notes :

- Output transistors should be matched in gain before replacement. Good matching

makes bias and offset setting easier.

- When one or more output transistor is broken, it is recommended to change the

whole set of power devices.

- Components are soldered on top side of the PCB

- T9 (MJE15030) must be soldered once PCB is installed on its metal socket

- Power transistors must be soldered after PCB is installed on its metal socket

III. Assembly of the amplifier PCB

1. place moons (blue isolation sockets) on the brass plate

2. add some thermal grease as shown in the previous image

3. join both aluminium and brass plates

4. insert transistor isolation plates on each sides

5. fix the amplifier PCB on the upper side using the 4 screw holes

6. insert and isolate power transistors and fix them using M3*16 screws

7. solder B and E pins of power transistors

Details of connections :

- connect 2 red wires from V+ pad to the positive side of the supply board

- connect 2 blue wires from V- pad to the negative side of the supply board

- connect 2 white wires from IN_GND pad to the GND side of the supply board

(middle point of the transformer)

- connect 4 red wires from Speaker output pads to the output inductance

(preceding speaker terminal)

- connect inputs IN+ and IN_GND pads to their respective input connectors

using wires as short as possible (not exceeding 15 cm)

IV. AMP1000 Stereo assembly

V. AMP1000 Mono assembly

VI. Bias setting

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