Arcam AV8 A85 PHONO STAGE

12345678

87654321

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:

DATE

Filename ECO No. DESCRIPTION OF CHANGE

G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870c1_2.0.PRJ

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

Cambridge CB5 9PB

A85 PHONO STAGE - TOP LEVEL

Circuit Diagram

L870C1

JBR23-Apr-2001

INITIALS

Date Printed 1 3Sheet of

Notes:

EMC

SK1

PHONO2HG

0V_SIG

LEFT IN LEFT OUT

LEFT CHANNEL

L870C2_2.0.SCH

RIGHT IN RIGHT OUT

RIGHT CHANNEL

L870C3_2.0.SCH

SK2

AMPCT8

+15V

-15V

0V_HF0V_SIG

Q_1

Q_2

Q_3

Q_4

Q_5

Q_6

Q_7 Q_8

PCB

PCB1

L870PB_2

Update Box

EL1

UPDATE_BOX

100N CD

00_1051 JAG 22/3/01 PRODUCTION ISSUE 1

01_1070 JAG 17/4/01 updated pcb and scm 2

Contents

Main Contents List Section Issue Manual Updates Service Manual changes issue 1.0 to 2.0 Summary Issue 1.0 to 2.0 Page OUT 1 N1501 OUTPUTS DVD-A/SACD IN SERIAL No. LABEL WARNING: THIS APPLIANCE MUST BE EARTHED MC AV8 PREAMP PROCESSOR MODEEFFECTTHX Page Technical Specifications Page AV8 Engineering Mode AV8 Programmer AV8 Loader (Preset Backup) Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page AV8 Phono Board Circuit Description Refer to circuit diagram L870 sheet 1 PSU Interface Amplification Page Page L870 Phono Board Parts List Issue 2.0 A85 PHONO STAGE - TOP LEVEL EMC PCB L870C1 A85 PHONO STAGE - LEFT CHANNEL L870C2 + 4N7 PP 0V_SIG0V_SIG A85 PHONO STAGE - RIGHT CHANNEL L870C3 + 0V_SIG0V_SIG 9 Page AV8 Digital Board Introduction Refer to circuit diagram L896 sheet 1 Connections ADC Refer to circuit diagram L896 Sheet 2 DAC Refer to circuit diagram L896 Sheets 3,4,5,6 DSP Refer to circuit diagram L896 Sheet 7 SPDIF Refer to circuit diagram L896 Sheet 8 Microprocessor Refer to circuit diagram L896 Sheet 9 Power Supply Refer to circuit diagram L896 Sheet 10 Re-clocking Refer to circuit diagram L896 Sheet 11 Page Page Page Page Page Page Page Page Page Page Page Page AV8 DIGITAL BOARD TOP LEVEL AV8 DIGITAL BOARD AV8 Analogue to Digital Converter AV8 DAC Centre and Sub AV8 DAC Left and Right AV8 DAC Left and Right Surround Back AV8 DAC Left and Right Surround AV8 Dolby Digital and THX DSP AV8 SPDIF Receiver NF AV8 Micro Controller AV8 Digital Board Power Supply P36VF1 0VF1 P36VSET P5VF2 OVF2 P5VF2SET AV8 Reclocking Page AV8 Power Supply Board External Synchronisatio n Input External PSU Kill Signal Under-voltage lockout Output Over-voltage Protection Overcurrent Protection Mains Present Signal Inrush current protection PSU Over-temperature Protection Figure 1 Figure 1 DGND Gate Drive Primay Current 54 Page Page Page Page Page 40W Universal Power Supply + CONTROL PCB + MAIN PCB + Page AV8 Display Board Refer to circuit diagram L898 sheet 1 Introduction Power Supply LEDs Page Page L898 Display Board Parts List Issue 1.2 AV8 DISPLAY AND KEYBOARD G R L898CT AD + Page AV8 Audio Board BLOCK DIAGRAM Input swit ching Refer to circuit diagram L921 sheet 1 Input gain range Refer to circuit diagram L921 sheet 3 Volume control and headphones Refer to circuit diagram L921 sheet 5,6 Zone2 and record loop outputs Refer to circuit diagram L921 sheet 4 Control lines from the micro Refer to circuit diagram L921 sheet 7 Power supply Refer to circuit diagram L921 sheet 8 General Overlay / Interconnections Refer to circuit diagram L921 sheet 9 Page Page Page Page Page Page Page Page L921 Audio Board Parts List Issue 1.2 Page Page Page L921CT - AV8 audio board interconnections TAPE OUT 02_E028 (Page 6) MJT 29/01/02 Production release 1.1 L921CT - AV8 audio board gain range section L921C3 AD/SUBCON L921CT - AV8 audio board input matrix buffer amps TAPE OUTPUT VCR OUTPUT L921C4 AD/subcon L921CT - AV8 audio Main, Zone 2 and Phones outputs L921C5 TO PHONES JACK MJT 29/01/02 Production release 1.1 100mW 20-30 ohms L921CT - AV8 audio Surround, Centre/Sub, & Ex outputs L921C6 SURROUND 02_E028 1.1Production release29/01/02MJT L921CT - AV8 audio board control logic circuit IP MUX IP MUX MAIN DCA ZONE 2 DCA SURROUND DCA CENTRE/SUB DCA EX DCA L921C7 GAIN RANGE INT/EXT MUTES L921CT - AV8 audio volume controls source select SURROUND RIGHT EXT PROCESSOR ENABLE LINE EX RIGHT L921C2 L921CT - AV8 audio board power supply regulators L921C8 AD/subcon + MJT 29/01/02 Production release 1.102_E028 + L921CT - AV8 Audio board input switching section L921C1 AUX DVD SAT AV VCR TAPE CD TUNER Page AV8 Video Board Introduction Video PCB Icons + Mechanical Refer to circuit diagram L922 sheet 1 Video Board Top Refer to circuit diagram L922 sheet 2 Video Board Refer to circuit diagram L922 sheet 3 RC5 I/O Triggers and RS232 Refer to circuit diagram L922 sheet 5 YUV/RGB Video Mux and OSD insert Refer to circuit diagram L922 sheet 6 SPDIF MUX a nd RXTX Refer to circuit diagram L922 sheet 7 SVIDEO a nd CVBS OSD insert Refer to circuit diagram L922 sheet 8 S-Video Multiplexer Refer to circuit diagram L922 sheet 9 Zone 2 OSD Refer to circuit diagram L922 sheet 10 Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page AV8 Video PCB Icons + Mech parts PCB L922 AV8 Video Circuit AV8 Video Board TOP L922 AV8 Video Circuit AV8 CVBS mux E870MC AV8 On Screen Display 1 2 74HC123D MONOSTABLE AV8 Svideo CVBS OSD Insert AV8 Zone2 OSD + AV8 Power Supply + AV8 RGB YUV Video Mux E869MC AV8 SVideo Mux AV8 SPDIF RXTX T B AV8 RC5 Trigger TOP - B BOTTOM - A Page AV8 Phase Locked Loop Board Introduction Refer To Block Diagram Specification Description Refer to circuit diagram L948 sheet 1 Range Page Page Page Page AV8 Phase Locked Loop PHASE COMP VCO Page Page Page Page AV8 Phono Card Upgrade Gen eral Assembly Parts List ARCAM