Arcam service manual A85 amplifier and PSU top sheet Circuit Diagram

Page 10

1

2

3

4

5

6

7

8

D

LSIG 0V_SIG 0V_LS_L 0V_HF_L +49V -49V

RSIG 0V_SIG 0V_LS_R 0V_HF_R +49V -49V

SW100A 2PCO

L882C3

L882C3_3.2.SCH

INPUTVIPROT

0V_SIGDCPROT

0V_LSOUTPUT

0V_HF

VPOS

VNEG

L882C4

L882C4_3.2.SCH

INPUTVIPROT

0V_SIGDCPROT

0V_LSOUTPUT

0V_HF

VPOS

VNEG

VIPROT_L

DCPROT_L

LS L

VIPROT_R

DCPROT_R

LS R

0V_D

0V_PSU

STANDBY

VIPROT_L

VIPROT_R

0V_TRIG

DCPROT_L

DCPROT_R

LS L

L882C2

L882C2_3.2.SCH

0V_D+5V(D)

0V_PSUVPOS

PWRONVNEG VIPROT_L THPROT_uC VIPROT_R VIPROT_uC

0V_TRIG AC_PRES DCPROT_L DCPROT_uC

DCPROT_R RC5 IN TRG IN

+5V_D

+49V

-49V

THERMPROT

VIPROT

AC PRESENT

DCPROT

REMOTE

TRIGGER

 

 

3

 

 

 

 

0V_SIG

 

 

 

 

 

 

 

 

 

0V_TRIG

 

5

 

 

 

 

6

0V_HF_R

 

TP121

0V_D

1

 

 

 

2

0V_LS_R

 

 

 

 

 

0V_HF_L

 

8

 

 

 

 

7

0V_LS_L

 

 

SP100

 

 

 

 

0V_PSU

 

 

 

 

 

 

 

STAR_8

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

+49V

D

C

1

2

3

TP101

L SIG

 

 

 

 

 

 

 

PL100

 

R SIG

 

 

2 1

SK104B

TP102

 

SK102

1

SK104A

 

 

 

SK106

1

2

0V_LS_L3

4

LS R

AMPCT4

D100 1N4003F

RLY100C RLY G5Z-2A-E

 

 

RLY101C

 

D101

 

 

RLY G5Z-2A-E

 

 

 

 

 

1N4003F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

FROM PREAMP

1

F

TP100

F

2

 

 

 

 

 

3

N EMC

 

N

4

C100 0V_SIG

AMPCT4

 

 

 

1N0 SM

 

 

 

 

PHONO4G

PL101

PHONO4G

 

 

0V_SIG

 

 

0V_SIG

2 1

 

 

4

 

 

 

SK107

TR100

 

TP118

 

R103

BD179

L

5

 

1

 

 

 

 

 

 

 

 

330R 1W CF

2

 

SK105

 

 

 

 

2

 

 

3

 

LHC

 

TP119

R104

 

3

 

4

 

RHC

 

 

 

 

1

TP120

 

330R 1W CF

 

 

HPSKT

 

AMPCT4

 

 

 

 

6

 

R105

R106

 

 

 

 

 

R

7

 

100R 1W CF 100R 1W CF

 

 

 

 

 

 

 

 

TR101

BD179

R107

220R SM

 

 

R101

SPKR1 ON

 

 

 

 

 

 

 

 

 

 

 

100R SM

 

 

 

R102

SPKR2 ON

 

 

 

 

 

 

 

 

 

 

 

100R SM

 

R108

220R SM

B

A

SW100B

4

5

6

 

 

 

2PCO

 

 

 

 

 

 

INTEGRATED / PRE-POWER

MODE SELECT SWITCH

+5V_D

SK103

R100

+49V

 

 

 

1

10R MF

 

 

2

 

 

 

 

 

3

 

 

 

4

 

STANDBY

TP103

5

 

SPKR1 ON

TP104

6

 

SPKR2 ON

TP105

7

 

THERMPROT

TP106

8

 

VIPROT

TP107

9

 

DCPROT

TP108

10

 

AC PRESENT

TP109

11

 

TRIGGER

TP110

12

 

REMOTE

TP117

13

 

0V_D

 

14

 

 

 

FFC 14W 2.54MM VER

 

 

8K7014

 

 

 

LS L

RLY100A

SK100A

RLY101A

SK100B

Top+

Bot+

 

 

 

 

 

TP111

 

TP113

 

TP115

 

RLY G5Z-2A-E

RLY G5Z-2A-E

0V_LS_L

 

 

 

 

 

 

Top-

 

Bot-

 

 

CAMCON_G

 

CAMCON_G

LS R

RLY100B

SK101A

RLY101B

SK101B

Top+

Bot+

 

 

TP112

TP114

TP116

 

 

 

RLY G5Z-2A-E

 

RLY G5Z-2A-E

 

0V_LS_R

 

 

 

 

 

 

Top-

 

Bot-

 

 

CAMCON_G

 

CAMCON_G

DRAWING TITLE

A85 amplifier and PSU - top sheet

Circuit Diagram

0V_D

PCB

PCB

L882PB_3

EL

EARTH LEAD 8M101

EARTH LEAD

01_1101

JR

6/4/01

POWER SUPPLY FUSES AND DC OFFSET

3.2

00_1134

MGM

17/11/00

NO CHANGE TO THIS SHEET

2.4

 

 

 

 

 

00_1138

JR

27/11/00

NO CHANGE TO THIS SHEET

2.3

00_1129

JR

1/11/00

NO CHANGE TO THIS SHEET

2.2

B

A

1

2

3

 

 

 

23425

Notes:

A & R Cambridge Ltd.

 

Pembroke Avenue

 

Denny Industrial Centre

 

Waterbeach

Filename

Cambridge CB5 9PB

L882C1_3.2.PRJ

 

 

4

 

5

 

 

 

 

00_1115

JR

16/10/00

NO CHANGE TO THIS SHEET

 

2.1

 

 

 

 

 

 

 

 

00_1086

JR

19/9/00

NO CHANGE TO THIS SHEET

 

2.0

 

 

 

 

 

 

 

 

ECO No.

INITIALS

DATE

 

DESCRIPTION OF CHANGE

ISSUE

 

Date Printed

 

 

 

Drawn by:

Sheet 1 of 4

DRAWING NO.

L882C1

 

 

6-Jun-2001

 

J Reckless

6

 

 

 

 

7

 

 

 

8

 

 

 

 

 

 

 

 

 

 

Image 10
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.