Arcam A75, A65, P75 Plus User Manual

Service Manual

ARCAM

A65/75

Issue 1.0

DiVA A65, A75 & P75 Plus
Amplifi ers

ARCAM

Contents List

!

Contents list

!

Circuit description

!

Service guide

!

Circuit diagrams

!

Component overlays

!

Circuit board parts list

!

General assembly parts list

A65/75/75P Plus Circuit Description

PSU

In order get the output devices to tu rn fully on and achieve the
greatest efficiency, an auxiliary rail is formed from a charge pump
driven by the main AC outputs from the transformer. C304,305 &
D301,302 charge on alternate cycles. In th e other cycle the charge
on C304,305 is pu mped into C310,311 respectively. Thi s creates a
voltage much greater than the standard rails, but wi th low regulation
and high ripple. This is then regulated to 38V via emitter followers
Q300,302,303,305 from a zener stabilized voltage (D304,305)

The Pre-amp ±15V supply comes from linear regulators Z300,301.
The transformer is a dual voltage unit, the required voltage being

selected b y which fuse holder is fitted with the appropriat e fuse. If an
alternative to 115V or 230V is requ ired then a different transformer
is fitted. Th e secondary is centre tapped for the main rails, but a
separate winding is added for the uC supply.

The star ground p oint SP300 is not a component on the PCB and is
on the schematic only for layout purposes.

Pre-amp

The direct signal path (line in, tone controls defeated) consists of a
single op-amp gain stage, buffering the j-fet input multiplexers and
Tape Monitor and AV switches . The selected input is AC coupled to
the op-amp, the output is DC to the Pre-out, via a j- f et "pre-mute"
switch. This switch is controlled by the uC in such a way that when
ever the output relay changes state signal is removed from the power
amplifier (A65/75).

The MM phono stage (by passable A75 only, SW100) is opamp
based. The circuit is AC coupled to give RIAA/IEC low frequency
response. The c artridge is loaded by R100,101,C119,120. The 1kHz
gain is 56dB, and RIAA eq set by
R110,112,111,113,C127,129,128,130.

Each line input has static protection a ffor ded by the ba ck to back
diodes (e.g. D101,103), and RF filtering is set by R118,C134 etc.
The selected input is buffered for Tap e output by Z104 set as a
follower. The output resistor is inside the feedback loop so to keep
the output impedance low and short protection is catered for.
C121,122 maintain stabilit y i nto capacitive loads.

From the tape monitor switch (Z105) onwards the signal is AC
coupled (C151,152). From there the signal is fed to the tone controls.
These consist of two stages: Balance and buffer (Z160), and
Bass/Treble Z161. The output of this stage is again AC coupled.
Switch SW162 selects whether the tone adjusted signal or a direct
signal reaches the gain section. In the A75 Z164 can be used to
bypass the volu me control when AV input is selected. This fixes th e
gain to allow an external AV processor to control the volume setting.

The gain stage (Z163) has a gain of 2.2, and the same low impedance
output arrangement as the Tape output. The signal from this stage to
the Pre- amp outputs and the Power amp input is controlled by a
pre-mute (Z171). This removes thumps and clicks, and in the case of
the Power amp r elay changing state, removes signal so ar cing will
not take place.

Power Amplifier

The new topology is a high gain voltage feedback design, with a
bipolar output stage. Its signal path is designed to be fully
symmetrical, despite not having a symmetrical circuit (symmetrical
rail to rail). This is achieved with a new dual differential input gain
block, where the input differential sees a symmetrical active load
(Q600,601,700,701) before driving the second voltage amplification
stage (VAS) differential (Q603,604,703,704). This could be
described as two Wilson mirrors with their bases clamped together.
The second differential also has an active load of a more traditional
mirror (Q610,611,710,711), and this gives a push pull signal to the
input of the output stage, improving on the traditional single ended
current source of the often called "blameless" topology.

The input pair (Q60 6,607,618,619, 706,707,718,719 ) are in a
Darlington confi guration to lower input current offset which in turn
will lower DC offset at the output, as the impeda nces seen on the
input nodes are necessarily high for the wide bandwidth required.

The output stage is a simple bipola r darlington (Q614,615,714,715).
However, the devices used are Darlingt on devices with integral
diodes. This means the bias temperature compensation i s part of the
output device enabling smaller number of devices, no extra devices
on the heatsink (vital for this mechanical layout) and more consistent
temperature compensation of bias. Also the resi st ors are also
integral, saving a large amount of PCB real estate and hand insertion
cost, while also able to be used as bias set test points and protection
sensing.

Due to the dec reased efficiency of this type of output stage over the
previous bootstrapped Mosfet output, a separate set of rails is
required for the VAS stage in order to satu rate the output transistors.
The operation of this is outlined in the Power supply section.
However, these rails are individually regulated for each channel to
decrease power supply crosstalk.

The protecti on of the output stage is taken care of by a proprietary IC
(Z101). This takes care of the switch on delay (R150,C149), DC
offset (R102,103,C147), Thermal trip (TH100), and safe operating
area.

The safe op erating area is monitored by a network which
compensates for the voltage across the output devices , current
through them, and duration of power (R627,606,625,605,C617 &
symmetrical associated components) and this is sent to the protection
IC via (Q605,612,613,616,617,712,713,716,717).

The output of the protection IC is sent to the micro controller (uC) to
signal the output relay (RLY1) status. Also, for output muti ng
purposes, the uC can switch the relay via Q100.

Input Selection

The uC cont r o ls the operation of the unit. IR commands are received
from RX900 on a break-off PCB found on the front panel and fed via
LK900/LK903 3-way ribbon. On power on/off the current state of
the pre-amp switching stored in an EEPR O M Z906. The inp ut
switching is 5V logic level and is direct from the uC to the DPDT
analogue switches in the case of Tape Monito r ( Z105), AV
(Z164,A75 on ly), Pre-mute (Z171) and Mute Q100. The source
selector is achieved by 8 way analogue multiplexors (Z102,103) and
the control signals are decoded from the uC from MUX1,2,3 by
Z907 which also drives the appropriate front panel LED. The input
selection is set by the remote control or the rotary encoder on the
front panel display PCB. Tape monitor and AV mode(A75 only) is
set by SW900.

Volume Control

The volume control is a motorized manual type, where the signals
are routed through the 8-way ribbon LK189. The motor drive comes
from Z905, which is a logic level controllable motor driver. It has its
own unregulated PSU (D907,C920),an d the speed of the volume
knob is dictated by the REF pin. The circuit (Q900,R905,901,C901)
allows the speed to vary from just ab ove stall to full as the volume
control button is depressed on the remote.

SIM Module

The connector PL161 (P75 only) allows the fitting of the ARCAM
SIM module. In order to allow this to operate LK172 & LK173 must
be removed. This will allow 12V trigger signals to operate the P75.

Headphones

The Speaker outputs (SK600,700) are connected to the headphone
socket (SK162) via an 8-way ribbon LK170,171. The output is
attenuated by a resistor network R161,162,236,237. The Relay drive
is fed through the headphone socket's switch (HPSW1,2) so that
when headphones are inserted the speakers are disconnected. Switch
SW163 allows the separate switching of the second speaker
terminals on SK600,700.

A65, A75 & P75 Service Guide

Fault diagnostics

Fault Action

No power Check mains fuse

Stuck in protection Check power supply rails

Intermittent audio on one channel Check for dry joints around o/p

Fails to respond to commands Check supply to remote circuit

Volume control rubs on front panel Pull knob out from fascia
Audio crackles on o/p Check for component break down

Power supply test points

Position Voltage

LK125 +37 volts DC
LK126 -37 volts DC
LK271 or black speaker terminal 0 volts
LK303 +15 volts DC
LK301 - 15 volts DC
Q300 emitter +38 volts DC
Q304 emitter +38 volts DC
Q302 emitter -38 volts DC
Q305 emitter -38 volts DC
D910 emitter +5 volts DC remote supply

IQ settings

Model IQ setting Comments - (22/01/02)

A65 37mV
A75 37mV
P75 37mV
A85 12mV Set for 8.5mV cold, reset for 12mV when warm
P85 12mV Set for 8.5mV cold, reset for 12mV when warm
A65 plus 12 to 15mV
A75 plus 12 to 15mV
P75 plus 12 to 15mV

!

To isolate a fault between pre and power stage remove C602 (left channel) or C702 (right
channel).

!

Always check and re-solder o/p device SAP15N and SAP15P pin connections.

!

Replace Z900 IC if software version is below version 3 ( note version 82 is also ok ).

!

Make sure R127 is not touching LK130.

!

When replacing the top cover with a new top it may be necessary to re-drill the fixing holes.

Check transformer connections
Check power supply rails

Check protection circuit voltages
Check for dry joints on o/p devices

devices

Check IC Z900
Check remote flex foil cable
Check for dry joints on selector pcb

using hot air gun & freezer spray
Check transformer connections

Hints & tips

PHONO & INPUTS
L942C3_1.0.SCH

ACSENSE
PROT_OP_L

PROT_OP_R
PROTECTION MUTE

TAPECONTROL

MUX2

MUX3

PROT SENSE

SELOPL

SELOPR

HPSW2

TAPOL
TAPOR

MUX1

HPSW1

REMOTE CONTROL
L942C7_1.0.SCH

MUTE

MUX1
MUX2
MUX3

PROT SENSE

TONE CONTROL
L942C4_1.0.SCH

AVCONTROL

PREMUTE

TAPECONTROL

SELOPL
SELOPR
HPSW2

HPSW1

PREMUTE

ACLT1

PROT_OP_R

PROT_OP_L

PWRLEFT

PWRRIGHT

TAPOL

TAPOR
SP2_SEND_L
SP2_RETN_L

OP_L

OP_R
SP2_SEND_R
SP2_RETN_R

AVCONTROL

LEFT CHANNEL
L942C5_1.0.SCH

SP2_SEND_L
SP2_RETN_L

PWRLEFT

RIGHT CHANNEL
L942C6_1.0.SCH

PWRRIGHT

SP2_SEND_R
SP2_RETN_R

PROTECTION

OP_L

A1
A1

OP_R

A1
A1

POWER SUPPLY
L942C2_1.0.SCH

ACLT1

ACSENSE

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C1_1.0.PRJ

Notes:

TOP SHEET FOR A65 L942AY

Contact Engineer:

01_E020

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.0

DATE

INITIALS

11-Dec-2001

Printed:

1 7Sheet of

DRAWING NO.

L942C1

ISSUE

C600
100U EL 100V

0V_HF

+38V_L

+

R601
100R MF

R602
100R MF

R615
47R MF

0V_HF

C613
100N PE 100V

C614
100N PE 100V

0V_HF

+37V

+

C603
100U 50V YXF LOW Z

D601
ZENER 400MW 27V

PWRLEFT

C623
100N PE 100V

C602

+

22U SILMIC 2

R600
1K0 MF

C603
100P PPW

0V_SIG

R612
100K MF

0V_HF

R632
12K MF

Q600
BC556B

Q619
BC546B

+

C601
100U EL 100V

Q606
BC546B

R613
47R MF

Q607
BC546B

R617
680R MF

Q608
BC546B

Q601
BC556B

R614
47R MF

0V_HF

Q618
BC546B

R633
12K MF

C605
100U SILMIC 2

0V_SIG

R618
10K MF

R619
10K MF

Q609
BC546B

D600
4V7 400MW

C604

100P PPW

C610
100N PE 100V

R616
2K7 MF

+

R611
100K MF

+

C624

100U 25V ZA EL

Q611

2SC2240GR

+

C616
10U EL

Q604
2SA970GR

R620
10K MF

R603
100R MF

R634
470K MF

C625
10U EL

C607 100P PPW

Q602
BC556B

Q603

2SA970GR

+

C611
100N PE 100V

Q610
2SC2240GR

R604
100R MF

C612
100N PE 100V

RV600
220R PSET

0V_HF

C608
100P PPW

-38V_L

Q614
SAP15N

Q615
SAP15P

C626
100U 50V YXF LOW Z

Bias-L +

SET BIAS TO 12mV

Bias-L -

C615

+

100N PE 100V

0V_HF

-37V

D603
1N4003F

D604
1N4003F

R627
430R MF

R628
430R MF

R606
100R MF

R607
100R MF

R625
6K8 MF

R605
100R MF

C617

+

10U EL

+

C618
10U EL

R608
100R MF

R626
6K8 MF

D602
ZENER 400MW 27V

Q613
BC546B

R621
680R MF

R622
10K MF

D605
1N4148

Q612
2SC2240GR

0V_LS_L

Q616
2SA970GR

R624
10K MF

R609
100R MF

C609
22N CD

A1

R630
4R7 W2 CF

C619
100N PE 100V

Q605
BC556B

R623
10K MF

D606
1N4148

Q617
ZTX653

R610
100R MF

R629
47K MF

PROTECTION

L600

2U2H LAC SMALL

R631
2R2 CF

A1

SP2_RETN_L

470P CD

OP_L

RLY1A

RLY G5Z-2A-E

SPLE600

PD6

C620

0V_LS_L

0V_LS_L

C622

1N0 CD

SPLD600

C621
470P CD

SPLS600

Bot+

SK600B
SPKSKT_G

Bot-

SK600C

CHASS

SPKSKT_G

SP2_SEND_L

Top+

SK600A
SPKSKT_G

Top-

CL600

E856MC
HS600

E81801-75

CL601

E856MC
HS601

E81801-75

SP600

Q2-PAD-SAP

HS602

E81801-75

21mm x 32mm

SELF ADHESIVE

Q2 PAD
E852MC

HS603

E81801-75

SP601

21mm x 32mm

SELF ADHESIVE

Q2 PAD
E852MC

Q2-PAD-SAP

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C5_1.0.SCH

Notes:

Left Channel Power Amplifier

Contact Engineer:

01_E020

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.0

DATE

INITIALS

11-Dec-2001

Printed:

5 7Sheet of

DRAWING NO.

L942C5

ISSUE

REPLACE WITH IDENTICAL PART

ACLT1

R900
1R0 FU

MOTE900

C900
10N CD

0V_DIG

D906
1N4003F

R903
100R MF

R902

+

C914

100R MF

220U EL

0V_DIG

RX900
PIC-26043TM2

3

2

O/P

+5V

O/P

GND1Case

Case

GND +5V

REMOTE SENSOR SNAP OFF BOARD

IR RX

SUPPORT PAD

SP1
IR RX SUPPORT PAD

R901
12K MF

R904
10R MF

D908
ZENER 5V1 400MW

LK900

1
2
3

L856CA

+5v

R905
33K MF

+

C901

100U EL

0V_DIG

+5v

+

C915
100U EL

3WAY CABLE HOLDER

D907

1N4003F

LK903

+5V

Q900
BC556B

1
2
3

P900

REMO900

0V_DIG

C912
10N CD

3

5

4

6

9

0V_DIG

+5V

C916
100N CD

0V_DIG

PROT SENSE

CC1

MC1

REF

MC2

CC2

Z900

1
2
3
4
5
6
7
8
9

10
11
12
13
14

PB5
PB4
PA3
PA2
PA1
PA0
PB3
PB2
PB1
PB0
VSS
(TMR)/INT
PC0
PC1

+5V

Z905

8

BA6109

VCC17VCC2

VOLUME DRIVEMOTOR DRIVER

28

PB6

27

PB7

26

PA4

25

PA5

24

PA6

23

PA7

22

OSC2

21

OSC1

20

VDD

19

RES

HT48R30 28-DIP-B-0

18

PC5

17

PC4

16

PC3

15

PC2

R913
10K MF

5

6WP7

SCL

SDA

4

VSS

3

0V_DIG

+

C920
1M0 25V

0V_DIG 0V_DIG

2

MD1

1

GND

0V_DIG

10

MD2

8

VDD

A01A12A2

Z906
24C01

C917
100N CD

C913
10N CD

D910
1N4148

R912

100K MF

+5v

MOTSUP900

+5v

+ C921

10U EL

0V_DIG

R914
4K7 MF

C918
100N CD

VOLM901

VOLMOT900
1Y271

1 2

VOLM900

X900

0V_DIG

CST4.00

0V_DIG

D911

1N4148

SK900
FFC10V

10

Disp H

Disp G

Disp I

SW900A
2PCO_NON_LAT

123

456

SW900B
2PCO_NON_LAT

MUTE

PREMUTE

Disp D

Disp F

Disp E

TAPECONTROL

AVCONTROL

MUX1

MUX2

MUX3

Disp C

Disp B
Disp A

123456789

0V_DIG

0V_DIG

13
14
15
12

1
5
2
4

6
11
10

9

7

Z907A
74HC4051

X0
X1
X2
X3
X4
X5
X6
X7

INH
A
B
C

VEE

3

X

R915
220R MF

+5v

0V_DIG

+5v

C919
100N CD

16

Z907B

VDD

GND

74HC4051

8

WARNING SAFETY CRITICAL COMPONENT

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C7_1.0.SCH

Notes:

uC, Volume Drive & Remote Control

Contact Engineer:

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.001_E020

INITIALS
Printed:

DATE

11-Dec-2001

7 7Sheet of

DRAWING NO.

L942C7

ISSUE

PHONO4G

TUNER

VCR

PHONO4G

TAPE IN

SK100A

EMC

PHONO4G

PHINR

SK100B

CD

SK103A

PHONO4G

SK103B

AV/DVD

SK102A

PHONO4G

SK102B

PHONO4G

F

N

+15v

D101

1N4148

1

PHINL

0V_SIG

+15v

D100

1N4148

CDL

4

TOP

BOT

EMC

EMC

+15v

F

6

N

5

1

F

N

F

N

1

F

N

F

N

1N4148

0V_SIG

CDR

+15v

1N4148

TUNL

+15v

1N4148

0V_SIG

TUNR

+15v

1N4148

VCRL

+15v

D110

1N4148

0V_SIG 0V_SIG

VCRR

+15v

1N4148

DVDL

+15v

1N4148

0V_SIG 0V_SIG

DVDR

+15v

1N4148

TAPL

+15v

1N4148

0V_SIG 0V_SIG

TAPR

+15v

1N4148

LK101
10MM LINK

1 2

D103

1N4148

LK102

1 2

10MM LINK
D102

1N4148

-15v

R118
1K0 MF

D104

1N4148
R119

1K0 MF

D105

1N4148

R121
1K0 MF

D108

1N4148
R122
1K0 MF

D109

1N4148

R123
1K0 MF

1N4148
R124
1K0 MF

D111

1N4148

R125
1K0 MF

D120

1N4148
R126

1K0 MF

D121

1N4148

R127

D122

1N4148
R128

1K0 MF

D123

1N4148

-15v

D106

D107

D112

D113

D114

D115

D124

D125

1K0 MF
D126

D127

-15v

-15v

-15v

-15v

-15v

-15v

-15v

-15v

-15v

-15v

0V_SIG

0V_SIG

0V_SIG

0V_SIG

0V_SIG

0V_SIG

0V_SIG

0V_SIG

0V_SIG

R130
100K MF

VCROR

R131
100K MF

TUNOL

R133
100K MF

TUNOR

R134
100K MF

CDOL

R135
100K MF

CDOR

R136
100K MF

DVDOL

R137
100K MF

DVDOR

R142
100K MF

TAPEOL

R143
100K MF

TAPEOR

R144
100K MF

C120

VCROL

C119

100P PP

R101

100P PP

C134
470P PPW

C135
470P PPW

C137
470P PPW

C138
470P PPW

C139
470P PPW

C140
470P PPW

C141
470P PPW

C142
470P PPW

C143
470P PPW

C144
470P PPW

R100

47K MF

+

C123
47P CD

47K MF

+

0V_SIG

C124
47P CD

R108
470R MF

C125
22U EL

0V_SIG

R109

470R MF

C126

22U EL

5
6

4N7 PP

3
2

R111

680K MF

C128

Z100A
NE5532

R110

680K MF

C127

4N7 PP

Z100B

NE5532

7

1

R113
56K MF

C130

1N3 PP

R112
56K MF

C129

1N3 PP

MUX1
MUX2
MUX3

AUXOL
VCROL
TUNOL
CDOL
DVDOL

AUXOR
VCROR
TUNOR
CDOR
DVDOR

MUX1
MUX2
MUX3

C131

+

22U EL

1 2

C132

+

22U EL

1 2

0V_SIG

0V_SIG

R114
8K2 MF

LK103
10MM LINK

R115
8K2 MF

LK104
10MM LINK

0V_SIG

0V_SIG

+15V

+

0V_SIG

AUXOL

C136
470P PPW

0V_SIG

0V_SIG

0V_SIG

0V_SIG

R139
100K MF

R138
100K MF

C145
10U EL

+

C146
10U EL

C133
470P PPW

+15v

C107

100N CD

C108

100N CD

-15v

+15v

C109
100N CD

C114
100N CD

-15v

C115
100N CD

C116
100N CD

3
2

5
6

+15v

Z104C

TL072

-15v

Z104A

TL072

Z104B

TL072

84

ACSENSE

PROT_OP_L

SK101A

TAPE OUT

EMC

PHONO4G

+15v

D117

D119

1N4148

D116

1N4148

+15v

-15v

1N4148

D118

1N4148

C110
100N CD

C118
100N CD

R154

1

47R MF

C122
100P PP

+15v

R155

7

47R MF

C121
100P PP

0V_SIG0V_SIG0V_SIG

TAPOL

1

F

N

0V_SIG

TAPOR

TAPOR

-15v

-15v

-15v

0V_SIG

TAPEOL

TAPECONTROL

Z105

1

SEL1

2

D1

3

S1

4

V­GND5VL

6

S4

7

D4

8

SEL4

DG413DJ

TAPECONTROL

TAPEOR

TAPOL

SEL2

SEL3

D2
S2
V+

S3
D3

16
15
14
13

+5v

12
11
10
9

TAPECONTROL
MUX1
MUX2
MUX3

+15v

TAPECONTROL

MUX1
MUX2
MUX3

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

R102
47K MF

R103
47K MF

C147
100U NP

Therm

TH100
PTH90DEG

C151

+

100U SILMIC 2

C152

+

100U SILMIC 2

Filename:
Notes:

R140
100K MF

0V_SIG

R141
100K MF

0V_SIG

L942C3_1.0.SCH

Phono Stage & Input Selection

Contact Engineer:

C101
100N CD

84

Z100C
NE5532

C102
100N CD

R116
18K MF

R120
1K0 MF

12
11
10

+5v

16
15

14

-15v

12
11
10

+5v

16
15

14

-15v

+15V

C112
100N CD

C113
100N CD

-15V

R117
1K0 MF

0V_SIG

Z102

4

X0

5

X1

6

X2

7

X3
X4
X5
X6

9

X7

2

EN

1

A0
A1
A2

GND

3

V-

DG408DJ
Z103

4

X0

5

X1

6

X2

7

X3
X4
X5
X6

9

X7

2

EN

1

A0
A1
A2

GND

3

V-

DG408DJ

R132
100K MF

-15V

0V_SIG

AUXOR

V+

V+

D

D

R129
100K MF

+15v

13
8

+15v

13
8

R156
1K5 MF

SELOPL

SELOPR

LED100

G

R

LED RED/GRN 3MM

PROTECTION

D128
1N4003F

R148
470R FU

AC Det

R104
47K MF

0V_HF 0V_HF

R105
47K MF

R157
100K MF

Contact Tel: [phone]Travis Pierce

LK100
L856CA

LK100A

1
2
3

3WAY CABLE HOLDER

0V_HF

R149
100K MF

C148

+

1U0 EL

2

IN1

3

IN2

C153
10N CD

1

5

R106
47K MF

PWR

V-

C117
470P CD

RC

1
2
3

C149
100U EL

8

RC

0V

4

R150
100K MF

0V_HF

9

V+

FB

7

D134

5V6 400MW

+

O

C150

+

1U0 EL
R152

0V_HF

0V_HF

TGP 12/12/01 PRODUCTION RELEASE 1.001_E020

INITIALS
Printed:

33K MF

11-Dec-2001

R151

18K MF

-37V

ECO No. DESCRIPTION OF CHANGE

D131
5V6 400MW

+37V

R145
10K MF

Z101
TA7317P

6

DATE

0V_HF

D130

1N4003F

R107
47K MF

R146
2K7 1W CF

C154
100N PE 100V

R153
1K0 1W CF

HPSW1

D132

1N4148

3 7Sheet of

+37V

R147
2K7 1W CF

D129

1N4003F

RLY1C
RLY G5Z-2A-E

HPSW2

MUTEPROT_OP_R

Prot

Q100
2SC2240GR

PROT SENSE

DRAWING NO.

L942C3

ISSUE

LK1
LINK10NP

LK2
LINK10NP

LK3
LINK10NP

LK4
LINK10NP

LK5
LINK10NP

LK201
LINK10NP
LK212
LINK15NP
LK220
LINK20NP
LK267
LINK17.5NP

LK268
LINK17.5NP

LK269
LINK15NP

LK6
LINK10NP

LK7
LINK10NP

LK8
LINK10NP

LK9
LINK10NP

LK10
LINK10NP

LK202
LINK10NP

LK213
LINK15NP

LK11
LINK10NP

LK12
LINK10NP

LK13
LINK10NP

LK14
LINK10NP

LK15
LINK10NP

LK203
LINK10NP

LK221
LINK20NP
LK270
LINK17.5NP

LK271
LINK15NP

LK272
LINK17.5NP

LK16
LINK10NP

LK17
LINK10NP

LK18
LINK10NP

LK19
LINK10NP

LK20
LINK10NP

LK204
LINK10NP
LK214
LINK15NP

LK21
LINK10NP

LK22
LINK10NP

LK23
LINK10NP

LK24
LINK10NP

LK25
LINK10NP

LK205
LINK10NP

LK215

LINK15NP
LK222
LINK20NP

LK26
LINK10NP

LK27
LINK10NP

LK28
LK08NP

LK29
LINK10NP

LK30
LINK10NP

LK206
LINK10NP

MAINS_N300

MAINS_E300

MAINS_L300

LK31
LINK10NP

LK32
LINK10NP

LK33
LINK10NP

LK34
LINK10NP

LK35
LINK10NP

LK207
LINK10NP
LK216
LINK15NP
LK223
LINK20NP

C300
3N3 MAINS

LK36
LINK10NP

LK37
LINK10NP

LK38
LINK10NP

LK39
LINK10NP

LK40
LINK10NP

LK208
LINK10NP

MAINS INPUT

SK300
IEC3

N E L

E

N

A1007

PD300

TOOLING

0V_HF

LK41
LINK10NP

LK42
LINK10NP

LK43
LINK10NP

LK44
LINK10NP

LK45
LINK10NP

LK209

LINK10NP
LK217
LINK15NP

LK224

LINK20NP

PD301
TOOLING

L

C301
3N3 MAINS

MAINS SWITCH

SW300B

SW300A

A1007

CS1

220N X2 CLASS

Chassis Earth Point,
Use correct screw and washer.

R300
100R MF

LK46

LK51

LINK10NP

LINK10NP

LK47

LK52

LINK10NP

LINK10NP

LK48

LK53

LINK10NP

LINK10NP

LK49

LK54

LINK10NP

LINK10NP

LK50

LK55

LINK10NP

LINK10NP

LK210

LK211

LINK10NP

LINK10NP
LK218
LINK15NP

LK225

LINK20NP

PD302
TOOLING

PD304
TOOLING

C302
3N3 MAINS

LK56
LINK10NP

LK57
LINK10NP

LK58
LINK10NP

LK59
LINK10NP

LK60
LINK10NP

LK277

LINK10NP
LK219
LINK15NP

C303

1N0 CD

0V_DIG

FS300
AS1A25

PD305
TOOLING

R311

D304

D305

0V_SIG

10R FU

R312
10R FU

+ C312

220U EL 50V

+ C313

220U EL 50V

C317
100N CD

C318
100N CD

Q300
BC546B

0V_HF0V_PSU

Q302
BC556B

+

C106
1U0 EL

+

C105
1U0 EL

+38V_R

+38V_R

C319
100N CD

C320

-37V_R -37V_L

100N CD

-38V_R

Z300
7805

I

Vin

Vout

GND

G

D306
10V 400MW

D307
10V 400MW

G

GND

I

Vin

Vout

Z301
7905

Q304
BC546B

+38V_L

Q305
BC556B

O

O

+37V_L

-38V_L

+15V

+

C315
100U EL

+

C316
100U EL

-15V

+300

-300

SELECT VOLTAGE
BY FITTING FS201
OR FS202

T300

FS301

AS2A5_115V

GREEN300

FIT ONLY ONE FUSE

T301

BLUE300
SK302

1

CAGECLAMP1

3

Orange

2

Dark Grey

1

Blue

SK301

CAGECLAMP3

Green

230V

115V

SCREEN

TX300
L836TX

EL

EARTH LEAD

8M101

EARTH LEAD

9Vac

SK303

Grey
Grey

CAGECLAMP2

BLUE301

SK304

Orange

Blue

Orange

CAGECLAMP3A

ACSENSE

C304

+

47U EL 100V

ACLT1

AC

1
2

0V_DIG

1

BR300

+

3

~

OR300

1
2
3

OR301

2

~

-

BRGBU8D

4

C305
47U EL 100V

+

C308
10M EL 50V

C309

10M EL 50V

+

+

+37V

-37V

C306
100N PE 100V

0V_SIG

0V_DIG

C307
100N PE 100V

0V_HF

D301
1N4003F

D302
1N4003F

0V_PSU

D300

1N4003F

D303

1N4003F

PSUP300

0V_LS_L

SP300
STAR_10

NSUP300

0V_HF

C310

+

100U EL 100V

ZENER 500MW 39V

C311

+

100U EL 100V

ZENER 500MW 39V

0V_LS_R

R301
4K7 MF

R302
4K7 MF

DO NOT USE THE FOLLOWING NUMBERS AS LINKS - THE DESIGNATORS ARE ALREADY USED ON OTHER PARTS OF THIS CCT!

LK100, LK101, LK102, LK103, LK104, LK168, LK170, LK171, LK172, LK173, LK174, LK175, LK176, LK177

LK126

LK61
LINK10NP

LK62
LINK10NP

LK63
LINK10NP

LK64
LINK10NP

LK65
LINK10NP

LK278
LINK10NP
LK230
LINK15NP
LK226
LINK20NP

PD303
TOOLING

LK66
LINK10NP

LK67
LINK10NP

LK68
LINK10NP

LK69
LINK10NP

LK70
LINK10NP

LK279
LINK10NP

LK231
LINK15NP

PD311
TARGET1

LK71

LK76

LK81

LK86

LINK10NP

LINK10NP

LINK10NP

LINK10NP

LK72

LK77

LK82

LK87

LINK10NP

LINK10NP

LINK10NP

LINK15NP

LK73

LK78

LK83

LK88

LINK10NP

LINK10NP

LINK10NP

LINK10NP

LK74

LK79

LK84

LK89

LINK10NP

LINK10NP

LINK10NP

LINK10NP

LK75

LK80

LK85

LK90

LINK10NP

LINK10NP

LINK10NP

LINK10NP

LK280

LK281

LK252

LK253

LINK10NP

LINK10NP

LINK10NP

LINK10NP
LK232
LINK15NP

LK227
LINK20NP

PD312
TARGET1 Y301

LK228
LINK20NP

PD306
TOOLING

LK233
LINK15NP

PD307
TOOLING

LK91
LINK10NP

LK92
LINK10NP

LK93
LINK10NP

LK94
LINK10NP

LK95
LINK10NP

LK255
LINK10NP
LK234
LINK15NP
LK229
LINK20NP

PD308
TOOLING

LK96
LINK10NP

LK97
LINK10NP

LK98
LINK10NP

LK99
LINK10NP

LK300
LINK10NP

LK235
LINK15NP

PD309
TOOLING

LK105
LINK10NP

LK301
LINK10NP

LK246
LINK20NP

LK106
LINK10NP

LK107
LINK10NP

LK108
LINK10NP

LK109
LINK10NP

LK110
LINK10NP

LK236
LINK15NP

PD310
TOOLING

LK111
LINK10NP

LK112
LINK10NP

LK113
LINK10NP

LK114
LINK10NP

LK115
LINK10NP

LK303
LINK10NP

LK247
LINK20NP

Y300

TX WIRE CLIP

LK116
LINK10NP

LK117
LINK10NP

LK118
LINK10NP

LK119
LINK10NP

LK120
LINK10NP

LK304

LINK10NP
LK237
LINK15NP

TX WIRE CLIP

LK121
LINK10NP

LK122
LINK10NP

LK123
LINK10NP

LK124
LINK10NP

LK125
LINK20NP

LK238
LINK15NP
LK248
LINK20NP

LINK17.5NP

LK127
LINK10NP

LK128
LINK10NP

LK129
LINK10NP

LK130
LINK10NP

EL300
Spare Fuse Clip

FUSE CLIP

LK131
LINK10NP

LK132
LINK10NP

LK133
LINK10NP

LK134
LINK10NP

LK135
LINK10NP

LK249
LINK20NP

LK136
LINK10NP

LK137
LINK10NP

LK138
LINK10NP

LK139
LINK10NP

LK140
LINK10NP

LK240
LINK15NP

LK141
LINK10NP

LK142
LINK10NP

LK143
LINK10NP

LK145
LINK10NP

LK241

LINK15NP
LK250
LINK20NP

LK148
LINK10NP

LK149
LINK10NP

LK150
LINK10NP

LK151
LINK10NP

LK152
LINK10NP

LK153
LINK10NP

LK154
LINK10NP

LK155
LINK10NP

LK242
LINK15NP
LK251
LINK20NP

LK156
LINK10NP

LK157
LINK10NP

LK158
LINK10NP

LK159
LINK10NP

LK160
LINK10NP

LK243
LINK15NP

LK161
LINK10NP

LK162
LINK10NP

LK163
LINK10NP

LK164
LINK10NP

LK165
LINK10NP

LK254
LINK20NP

LK166
LINK10NP

LK167
LINK10NP

LK244
LINK15NP

LK178
LINK10NP

LK179
LINK10NP

LK180
LINK10NP

LK245
LINK15NP

LK181
LINK10NP

LK182
LINK10NP

LK183
LINK10NP

LK185
LINK10NP

LK256
LINK15NP

LK186
LINK10NP

LK187
LINK10NP

LK188
LINK10NP

LK189
LINK10NP

LK190
LINK10NP

LK257
LINK15NP

LK191
LINK10NP

LK192
LINK10NP

LK193
LINK10NP

LK194
LINK10NP

LK195
LINK10NP

LK196
LINK10NP

LK197
LINK10NP

LK198
LINK10NP

LK199
LINK10NP

LK258
LINK10NP

LK265
LINK15NP

PCB1

L940PB_A

PCB

DD300

PCB MATERIAL

CEM1, 2 OZ Cu

CEM1_20Z

PS300

Photo Strip

PHOTO_STRIP

DD302

A1 Horizontal

Paper Marker

DD_A1H

WARNING SAFETY CRITICAL COMPONENT
REPLACE WITH IDENTICAL PART

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C2_1.0.SCH

Notes:

POWER SUPPLY

Contact Engineer:

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.001_E020

INITIALS
Printed:

DATE

11-Dec-2001

2 7Sheet of

DRAWING NO.

L942C2

ISSUE

C700
100U EL 100V

0V_HF

+

Q700
BC556B

R701
100R MF

R702
100R MF

Q701
BC556B

R715
47R MF

Q702
BC556B

0V_HF

+38V_R

C713
100N PE 100V

C714
100N PE 100V

0V_HF

+37V

+

C706
100U 50V YXF LOW Z

D701
ZENER 400MW 27V

SPLS700

PWRRIGHT

C723
100N PE 100V

+

C702
22U SILMIC 2

R700
1K0 MF

C703
100P PPW

0V_SIG

R712
100K MF

0V_HF

Q719
BC546B

R732
12K MF

+

C701
100U EL 100V

Q706
BC546B

R713
47R MF

Q708
BC546B

Q707
BC546B

R717
680R MF

R714
47R MF

0V_HF

Q718
BC546B

R733
12K MF

C705
100U SILMIC 2

0V_SIG

R718
10K MF

R719
10K MF

Q709
BC546B

D700
4V7 400MW

C704

100P PPW

C710
100N PE 100V

R716
2K7 MF

+

R711
100K MF

+

C724

100U 25V ZA EL

+

C716
10U EL

Q704
2SA970GR

R720
10K MF

R703
100R MF

Q711
2SC2240GR

R721
470K MF

C725
10U EL

C707 100P PPW

+

Q703
2SA970GR

C711
100N PE 100V

Q710
2SC2240GR

R704
100R MF

C712
100N PE 100V

RV700

220R PSET

0V_HF

C708
100P PPW

-38V_R

Q714
SAP15N

Q715
SAP15P

+

C709
100U 50V YXF LOW Z

Bias-R +

SET BIAS TO 12mV

Bias-R -

C715
100N PE 100V

0V_HF

-37V

D703
1N4003F

D704
1N4003F

R727
430R MF

R728
430R MF

R706
100R MF

R707
100R MF

R725
6K8 MF

R705
100R MF

+

C717
10U EL

+

C718
10U EL

R708
100R MF

R726
6K8 MF

Q713
BC546B

D702
ZENER 400MW 27V

D705
1N4148

Q712
2SC2240GR

0V_LS_R

Q716
2SA970GR

R724
10K MF

R709
100R MF

A1

R730
4R7 W2 CF

C719
100N PE 100V

R723
10K MF

D706
1N4148

Q717
ZTX653

R710
100R MF

L700

2U2H LAC SMALL

R731

2R2 CF

A1

SP2_RETN_R

470P CD

OP_R

RLY1B

RLY G5Z-2A-E

SPLE700

0V_LS_R

PD6

C720

0V_LS_R

C722

1N0 CD

SPLD700

C721
470P CD

Bot+

SK700B
SPKSKT_G

Bot-

SK700C

CHASS

SPKSKT_G

SP2_SEND_R

Top+

SK700A
SPKSKT_G

Top-

SP700

21mm x 32mm

SELF ADHESIVE

Q2 PAD

E852MC

Q2-PAD-SAP

SP701

21mm x 32mm

SELF ADHESIVE

Q2 PAD

E852MC

Q2-PAD-SAP

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C6_1.0.SCH

Notes:

Right Channel Power Amplifier

Contact Engineer:

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.001_E020

INITIALS
Printed:

DATE

11-Dec-2001

6 7Sheet of

DRAWING NO.

L942C6

ISSUE

SELOPL

R200
24K MF

RV167A
10K LIN POT

R210
10K MF

0V_SIG

C197

10P CD

Z160A

2
3

4560D

R212
68K MF

1

C200

+

47U EL 35V

R202
4K7 MF

Tone controls :
8dB cut and boost

BASS

RV166A
10K LIN POT

C204
220N PE

R214
3K3 MF

RV165A
10K LIN POT

TREBLE

Pot arrow shows max boost

R205
4K7 MF

C208
4N7 PP

R204
4K7 MF

C206
220N PE

R216
3K3 MF

0V_SIG

3
2

Z161A

4560D

C210

100P PP

1

LK200
LINK10NP

C202

+

10U EL

0V_SIG

123

R232
100K MF

SW162A
2PCO

SK162
HPSKT

LHC

RHC

SW163A
2PCO

123

PROT_OP_L

4

HPSW1

5

L

HPSW2 SP2_SEND_L

2
3
1

6
7

R

R236
100R W2 CF

330R 1W CF

PROT_OP_R

R237
100R W2 CF

R161
330R 1W CF

R162

456

SW163B
2PCO

LK170

1
2
3
4
5
6
7

L825CA

LK171

1
2
3
4
5
6
7

L825CA

SP2_RETN_L
SP2_RETN_R

SP2_SEND_R

OP_L

OP_R

0V_LS_R

SELOPR

LK168
L809CA

1
2
3
4
5
6
7
8

RV164C
6A360M

+

+ -

VOLUME POT SNAP OFF BOARD

R201
24K MF

RV167B
10K LIN POT

C195
10N CD

R213
10K MF

0V_SIG

10P CD

68K MF
Z160B

6
5

4560D

C196

R211

RV164A
6A360M

RV164B
6A360M

VOLMOTA161
2W CABLE HOLDER

1 2

7

RV164D

9

Case

7

6A360M

C201

+

47U EL 35V

R203
4K7 MF

C205
220N PE

Tone controls :
8dB cut and boost

R215
3K3 MF

BASS

R206

RV166B

4K7 MF

10K LIN POT

C207
220N PE

R207
4K7 MF

C209
4N7 PP

R217

RV165B

10K LIN POT

TREBLE
Pot arrow shows max boost

3K3 MF

0V_SIG

5
6

Z161B

4560D

C211

100P PP

7

LK239

LINK10NP

C203

+

10U EL

0V_SIG

0V_SIG

R233
100K MF

LK169

1
2
3
4
5
6
7
8

L809CA

SW162B
2PCO

456

+15V

LK176

1 2

10MM LINK

Fit on A65 only

C216
100N CD

C217
100N CD

LK177

1 2

10MM LINK

Fit on A65 only

+15v

-15v

0V_SIG

0V_SIG

0V_SIG

R234
100K MF

R235
100K MF

0V_SIG

0V_SIG

Z163A

3
2

OPA2134PA

R240
1K0 MF

Z163B

5
6

OPA2134PA

R160
1K0 MF

1

7

R230
47R MF

C227
100P PPW

R238
1K2 MF

R231
47R MF

C228
100P PPW

R239
1K2 MF

0V_SIG

-15v

PREMUTE161

PREMUTE

Z171

1

SEL1

2

D1

3

S1

4

V­GND5VL

6

S4

7

D4

8

SEL4

DG413DJ

PREMUTE

SEL2

SEL3

16
15

D2

CUT LINK IF CIM FITTED (8P ONLY)

14

S2

+15v

13

V+

+5v

12
11

S3
D3

PREMUTE

0V_SIG

10

CUT LINK IF CIM FITTED (8P ONLY)

9

+15v

-15v

+15v

1 2

+15v

1 2

C223
100N CD

0V_SIG

C224
100N CD

D164
1N4148

LK173

10MM LINK

PWRRIGHT

D166

1N4148

LK172
10MM LINK

PWRLEFT

D165
1N4148

D167

1N4148

-15v

0V_SIG

-15v

0V_SIG

R208
100K MF

R209
100K MF

FIT LINKS FOR 8P

FIT LINK FOR 8P ONLY

SK101B

5

BOT

6

0V_SIG

4

TOP

PHONO4G

FIT LINK FOR 8P ONLY

N

F

PREAMP OUT

84

Z163C

OPA2134PA

Z160C
4560D

84

Z161C
4560D

84

0V_SIG

-15V

C213
100N CD

+

C215
22U EL

+

C214.
22U EL

C220
100N CD

C218
100N CD

C221
100N CD

C219
100N CD

C222
100N CD

USE 'exlude A65' FILTER FOR BOM

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A65 PLUS AMP

Filename:

L942C4_1.0.SCH

Notes:

Pre-amp Out, Tone & Headphone

Contact Engineer:

01_E020

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

TGP 12/12/01 PRODUCTION RELEASE 1.0

DATE

INITIALS

11-Dec-2001

Printed:

4 7Sheet of

DRAWING NO.

L942C4

ISSUE

PHONO & INPUTS
L940C3_1.0.SCH

ACSENSE
PROT_OP_L

PROT_OP_R
PROTECTION MUTE

TAPECONTROL

MUX2

MUX3

PROT SENSE

SELOPL

SELOPR

HPSW2

TAPOL
TAPOR

MUX1

HPSW1

REMOTE CONTROL
L940C7_1.0.SCH

MUTE

MUX1
MUX2
MUX3

PROT SENSE

TONE CONTROL
L940C4_1.0.SCH

AVCONTROL

PREMUTE

TAPECONTROL

SELOPL
SELOPR
HPSW2

HPSW1

PREMUTE

ACLT1

PROT_OP_R

PROT_OP_L

PWRLEFT

PWRRIGHT

TAPOL

TAPOR
SP2_SEND_L
SP2_RETN_L

OP_L

OP_R
SP2_SEND_R
SP2_RETN_R

AVCONTROL

LEFT CHANNEL
L940C5_1.0.SCH

SP2_SEND_L
SP2_RETN_L

PWRLEFT

RIGHT CHANNEL
L940C6_1.0.SCH

PWRRIGHT

SP2_SEND_R
SP2_RETN_R

PROTECTION

OP_L

A1
A1

OP_R

A1
A1

POWER SUPPLY
L940C2_1.0.SCH

ACLT1

ACSENSE

USE EXCLUDE NF TO CREATE RUN OUT SHEET FOR A75
USE EXCLUDE A65 TO CREATE RUN OUT SHEET FOR A65

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A75 PLUS AMP

Filename:

L940C1_1.0.prj

Notes:

TOP SHEET FOR A75 L940AY

Contact Engineer:

TGP

01_E020 12/12/01 PRODUCTION RELEASE 1.0

ECO No. DESCRIPTION OF CHANGE

INITIALS

11-Dec-2001

Contact Tel: [phone]Travis Pierce

Printed:

DATE

1 7Sheet of

DRAWING NO.

L940C1

ISSUE

C600
100U EL 100V

0V_HF

+

Q600
BC556B

R601
100R MF

R602
100R MF

Q601
BC556B

R615
47R MF

Q602
BC556B

C613
100N PE 100V

0V_HF

+38V_L

C614
100N PE 100V

0V_HF

+37V

+

C606
100U 50V YXF LOW Z

D601
ZENER 400MW 27V

R621
680R MF

C609
22N CD

PWRLEFT

C623
100N PE 100V

C602

+

22U SILMIC 2

R600
1K0 MF

C603

100P PPW

0V_SIG

R612
100K MF

0V_HF

R632
12K MF

Q619
BC546B

+

C601
100U EL 100V

Q606
BC546B

R613
47R MF

Q607
BC546B

47R MF

R617
680R MF

R614

Q608
BC546B

R633
12K MF

100U SILMIC 2

0V_HF

Q618
BC546B

C605

R618
10K MF

R619
10K MF

CL600

E856MC
HS600

E81801-75

C604

100P PPW

R616
2K7 MF

+

0V_SIG

Q609
BC546B

D600
4V7 400MW

CL601

E856MC
HS601

E81801-75

C610
100N PE 100V

R611
100K MF

C624

+

100U 25V ZA EL

2SC2240GR

+

C616
10U EL

Q611

HS602

E81801-75

Q604
2SA970GR

R620
10K MF

R603
100R MF

SP600

21mm x 32mm

SELF ADHESIVE

Q2 PAD

E852MC

Q2-PAD-SAP

HS603

E81801-75

2SA970GR

R634
470K MF

C625
10U EL

C607 100P PPW

SP601

21mm x 32mm

SELF ADHESIVE

Q2-PAD-SAP

Q2 PAD

E852MC

Q603

+

C611
100N PE 100V

Q610
2SC2240GR

R604
100R MF

C612
100N PE 100V

RV600
220R PSET

0V_HF

C608
100P PPW

-38V_L

Q614
SAP15N

Q615
SAP15P

C626
100U 50V YXF LOW Z

+

Bias-L +

SET BIAS TO 12mV

Bias-L -

C615
100N PE 100V

0V_HF

-37V

D603
1N4003F

D604
1N4003F

R627
430R MF

R628
430R MF

R606
100R MF

R607
100R MF

R626
6K8 MF

Q605
BC556B

R625
6K8 MF

R605
100R MF

C617

+

10U EL

+

C618
10U EL

R608
100R MF

Q613
BC546B

D602
ZENER 400MW 27V

R622
10K MF

D605
1N4148

Q612
2SC2240GR

0V_LS_L

Q616
2SA970GR

R624
10K MF

R609
100R MF

A1

R630
4R7 W2 CF

C619
100N PE 100V

R623
10K MF

D606
1N4148

Q617
ZTX653

R610
100R MF

R629
47K MF

PROTECTION

L600

2U2H LAC SMALL

R631
2R2 CF

A1

USE EXCLUDE NF TO CREATE RUN OUT SHEET FOR A75
USE EXCLUDE A65 TO CREATE RUN OUT SHEET FOR A65

DRAWING TITLE

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A75 PLUS AMP

Filename:

L940C5_1.0.SCH

Notes:

Left Channel Power Amplifier

Contact Engineer:

Contact Tel: [phone]Travis Pierce

ECO No. DESCRIPTION OF CHANGE

SPLS600

SP2_RETN_L

C620

470P CD

0V_LS_L

OP_L

RLY1A

RLY G5Z-2A-E

SPLE600

0V_LS_L

C622

PD6

1N0 CD

TGP01_E020 12/12/01 PRODUCTION RELEASE 1.0

DATE

INITIALS

11-Dec-2001

Printed:

SPLD600

C621
470P CD

5 7Sheet of

Bot+

SK600B
SPKSKT_G

Bot-

SK600C

CHASS

SPKSKT_G

SP2_SEND_L

Top+

SK600A
SPKSKT_G

Top-

DRAWING NO.

L940C5

ISSUE