Arcam A85 service manual Title P85 Switch Board

Page 47

TITLE P85 SWITCH BOARD

DWG. No.

L910PB

ISSUE 1.0

ECO No 00_1099

DATE 29/09/00

 

 

 

 

 

DRAWN BY

CL

RUN-OUT SHEET

SHEET 1 of 2

 

 

 

 

 

part

Qty Iss

Description

Designators

******** PCB Finish items:

 

 

 

 

 

 

******** (For drawing office use only. Will be

 

 

 

 

******** kitted from mechanical run-out sheet.)

 

 

 

 

5B483028

1

 

IC CMOS MICRO HT48R30 28-DIP-B-0

Z1

 

 

 

******** PCB Build items:

 

 

 

 

 

 

1H118

1

 

RES MF W4

1%

180R

R15

 

 

 

1H133

1

 

RES MF W4

1%

330R

R14

 

 

 

1H147

3

 

RES MF W4

1%

470R

R19

R20

R21

1H156

2

 

RES MF W4

1%

560R

R12

R13

 

1H310

13

 

RES MF W4

1%

10K

R1

R2

R3 R4 R5 R6

 

 

 

 

 

 

R7

R8

R9 R10 R11

 

 

 

 

 

 

R17

R18

 

1H410

1

 

RES MF W4

1%

100K

R16

 

 

 

2A410

9

 

CERD 100N

63V -20% +80% RA

C1

C2

C3 C4 C9 C10

 

 

 

 

 

 

C11

C12

C13

2N610

1

 

ELST 10U 50V

 

C5

 

 

 

2N710

4

 

ELST 100U

25V

 

C6

C7

C8 C14

3A4148

2

 

SSDIODE 1N4148 75V

D1

D2

 

 

3D006

1

 

LED RED/GREEN 3MM L-93WEGW

LED3

 

 

3D007

2

 

LED GREEN 3.1MM SLR-37MG3F

LED1 LED2

4A546

3

 

TRANS LF SS N BC546B

Q5

Q6

Q7

4A556

4

 

TRANS LF SS P BC556B

Q1

Q2

Q3 Q4

5J7432

1

 

HCMOS 74HC32

 

Z2

 

 

 

7W005

1

 

CER RESON 4.00MHz

X1

 

 

 

8K7014A

2

 

FFC 14W 2.54MM HOR PTH

SK1 SK2

 

8S028N

1

 

IC SOCKET

28

NARROW

Z1

 

 

 

A1503

2

A TACT SWITCH SKHVPE

SW1 SW2

 

A1506

1

 

TACT SWITCH BOURNS SDTX-644

SW3

 

 

 

L910PB_1

1

X PRINTED CIRCUIT BOARD

PCB

 

 

 

******** Prototype or pre-production parts used:

 

 

 

 

A1503

2

A TACT SWITCH SKHVPE

SW1 SW2

 

******** Obsolete, absent, redundant, or incorrect issue in PDM:

L910PB_1

1

X PRINTED CIRCUIT BOARD

PCB

 

 

 

***************************************************************************

********************* Additions Since L910RS Issue C **********************

***************************************************************************

Part

Qty Iss

Description

Designators

A1503

2

A

TACT SWITCH SKHVPE

SW1 SW2

L910PB_1

1

X

PRINTED CIRCUIT BOARD

PCB

***************************************************************************

********************* Deletions Since L910RS Issue C **********************

Image 47
Contents A85 Contents List Pre-amplifier circuit description Amplifier & PSU Circuit Description L882 Circuit Sheet PSU Ground naming convention is as follows A85, P85, P85/3 Service Guide Fault Diagnostics A85 amplifier and PSU top sheet Circuit Diagram A85 amplifier power supply and microcontroller interface A85 amplifier power output stage left A85 amplifier power output stage right DVD Display PCB USE Exclude NF When Using Runout Sheet Program Integrated amplifier preamp main signal path Integrated amplifier preamp power supply A85 Display PCB Circuit Diagram A85 Phono Stage TOP Level A85 Phono Stage Left Channel A85 Phono Stage Right Channel AP85 third channel top level 23425 P85 microcontroller and switch Page Page Page Page Page Page Page Arcam 220NF Class X2 CAP 275VRMS IC Vreg POS Wima FKP2 Ppro Obsolete, absent, redundant, or incorrect issue in PDM Part Qty Iss Description Designators Phono SKT 4-WAY EMC Gold SK2 SK3 SK4 SK5 WAF MN12818A VFD Itron DISP1 Title A85 Phono PCB Title RES SM Phono SKT 2-WAY EMC Gold Title P85 Switch Board Tact Switch 2-PIN LOW Prof SW1 SW2 A85 General Assembly Parts List Silver Black Description Where Used QTY P85 General Assembly A85P Transformer P85/3 General Assembly Clamp E912MC to E804HK ST=L
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Manual 14 pages 30.61 Kb

A85 specifications

The Arcam P85 and A85 amplifiers are a testament to Arcam's commitment to high-quality audio performance. These components are well-known in the audiophile community for their unique blend of state-of-the-art technology and superior sound quality, catering to discerning listeners who value fidelity and craftsmanship.

The Arcam A85 is a high-performance integrated amplifier that features a robust design and advanced circuitry. It offers a powerful 85 watts per channel output, which is more than sufficient to drive a wide range of speakers with clarity and precision. The A85 incorporates a dual mono design with separate power supplies for the left and right channels, ensuring low crosstalk and high channel separation. This design choice also enhances the amplifier’s dynamic response, allowing it to handle complex musical passages with ease.

One of the standout features of the A85 is its use of high-quality components, including low-noise transistors and capacitors that are specifically chosen to minimize distortion. The amplifier exhibits an impressive signal-to-noise ratio, contributing to a clean audio signal that preserves the nuances of the music.

On the other hand, the Arcam P85 is a powerful, dedicated power amplifier that pairs perfectly with the A85. It utilizes a Class G amplification technology, which provides significant power efficiency. This means that the P85 can deliver peak power output without generating excessive heat, making it an ideal choice for long listening sessions.

The P85 offers 85 watts per channel into 8 ohms but can also deliver 140 watts into 4 ohms, allowing it to drive even the most demanding loudspeakers with authority. Its balanced XLR inputs, alongside standard RCA inputs, ensure compatibility with various audio sources, while the sturdy construction ensures durability and performance.

Both the A85 and P85 feature a simple yet elegant design, characterized by a sleek chassis that minimizes resonances and maximizes aesthetic appeal. They also come equipped with a variety of connection options, including multiple line-level inputs and outputs, making integration into an existing audio system straightforward.

In summary, the Arcam P85 and A85 amplifiers represent a harmonious fusion of innovative technology, impeccable sound quality, and user-friendly design. Their powerful performance, combined with high efficiency and low distortion, makes them a prized possession for any audiophile seeking to enhance their listening experience. Whether used in a stereo setup or as part of a more extensive home theater system, the A85 and P85 deliver exceptional audio performance that stands the test of time.