Arcam DiVA A85 Service Manual
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Arcam DiVA A85 Service Manual

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Service Manual
DiVA A85, P85 & P85/3
Amplifi ers
A85
Issue 2.0
ARCAM
ARCAM

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Summary of Contents for Arcam DiVA A85

  • Page 1 Service Manual Issue 2.0 DiVA A85, P85 & P85/3 Amplifi ers ARCAM ARCAM...
  • Page 2 Contents List Contents list Circuit description Service guide Circuit diagrams Component overlays Circuit board parts list General assembly parts list...
  • Page 3 The digital pots Z108D and Z108A control the bass and treble Pre-amplifier circuit description respectively. This is done by moving the wiper connected to the frequency-sensitive impedance between the non-inverting and inverting terminals of Z112A, effectively changing the ratio of The A85 preamplifier is a high-performance, DC coupled design feedback boost and feed-forward attenuation of the circuit at the with microprocessor control of input select, two independent tape...
  • Page 4 Star point SP100 is the ground ‘mecca’ for the entire amplifier Amplifier & PSU Circuit Description (comprising all three PCBs within the unit). All of the separately named grounds are joined explicitly at this point. Different named grounds are used to ensure that no two ‘different’ grounds share L882PB is the printed circuit board that provides the power supply copper, which could compromise the noise, distortion or crosstalk and output stage amplifiers for the A85 integrated and power...
  • Page 5 SK201B is a 13VDC signal trigger output which is active whenever the amplifier is powered up. R218 and DZ207 / C223 The input to the amplifier is limited to ±5.4V via back-to-back provide a reference voltage which is buffered by TR200. TR201 zener diodes DZ302 and DZ303.
  • Page 6 both halves of the following stage receive an equal AC signal C313 locally couples the ‘high frequency’ and loudspeaker ground component at high frequency. returns together at the output to overcome the effects of track inductance back to the star point. C309 couples the ‘high TR310 and TR307 are the ‘pre-driver’...
  • Page 7 SK103 connects to the micro controller and display PCB. The 14 pin connector is numbered as follows: Name Type Description +5V_D 5 volt digital supply (for micro) 0V_D Digital ground +49V Main power supply for VFD (via fusible resistor) STANDBY Mains relay control signal (HIGH = ON) SPKR1 ON...
  • Page 8 Current Fuse Ratings (20/02/02) Fuse Position Fuse Rating Main Supply fuses - A85, P85, P85/3 2 x 4AT 20mm (Arcam part number C12406) PSU fuse F202 - A85, P85, P85/3 750mA surface mount (Arcam part number C3751) Preamp fuses F300, F301 – A85...

  • Page 9: Fault Diagnostics

    Fault Diagnostics Fault Action No power Check fuses Check power supply rails Unit functions ok but no audio Check preamp fuses Check RL100A (volume control mute relay) Check +5V supply rail Check mute signal line Volume control locks up Check software version is 2.0 or higher DC offset Check equipment connected to amp for DC on the audio leads Check alterations as per ECO 01_1101 have been fitted...
  • Page 10 L882C3 0V_SIG L882C3_3.2.SCH L SIG VIPROT_L 0V_TRIG 0V_HF_R INPUT VIPROT 0V_SIG DCPROT_L 0V_SIG DCPROT TP121 0V_LS_L LS L 0V_D 0V_LS_R 0V_LS OUTPUT 0V_HF_L L882C2 0V_HF +49V 0V_D L882C2_3.2.SCH 0V_HF_L 0V_LS_L VPOS -49V 0V_PSU +5V_D VNEG 0V_D +5V(D) SP100 +49V 0V_PSU 0V_PSU VPOS STAR_8...
  • Page 11 NEUTRAL SK204 TP203 HS200 TO220HS08REG TX200 9VRMS IC201 +5V_D MOLEXPWR8 F202 7805 TP204 RLY200A Vout +5V(D) TP205 D200 D202 T750mA SM DPDT5V 1N4003F 1N4003F SK203 LIVE SW200B VR200 IEC3 NO RIVETS C207 VOL SEL SLIDE VDR 115V C225 C226 EMC Shield F200 TP202 100N CD...

  • Page 12: A85 Amplifier - Power Output Stage Left

    VPOS R319 100R SM R315 R316 R300 100R SM 100R SM PRE DRIVER 10K SM PNP CURRENT MIRROR TR310 TR300 TR301 FMMT497 FMMT597 FMMT597 R301 10K SM C300 R321 TR302 DZ300 TR309 22R SM FMMT597 100U EL 15V 350MW SM FMMT497 TR321 FMMT597...
  • Page 13 VPOS R419 100R SM R415 R416 R400 100R SM 100R SM PRE DRIVER 10K SM PNP CURRENT MIRROR TR410 TR400 TR401 FMMT497 FMMT597 FMMT597 R401 10K SM C400 R421 TR402 DZ400 TR409 22R SM FMMT597 100U EL 15V 350MW SM FMMT497 TR421 FMMT597...
  • Page 14 DISP1 DISP SSV-07MS09 Q_26 R110K SM Q_27 R2 10K SM (was POWER) SKIP> <SKIP PAUSE PLAY STOP OPEN FWD>> D1 BAS16W SM D2 BAS16W SM <<RWD D3 BAS16W SM R3 10K SM Q_28 D4 BAS16W SM (was MENU) VKK switching CCT VKK_D 100N SM VKK_CK...
  • Page 15 Main signal path Power supply L937C2_1.1.SCH L937C3_1.1.SCH USE EXCLUDE NF WHEN USING RUNOUT SHEET PROGRAM DRAWING TITLE Integrated amplifier preamp PCB1 Circuit Diagram 23425 Notes: 01_E014 28/11/01 Fuses uprated to 2A A & R Cambridge Ltd. L937PB_1 Pembroke Avenue 01_1142 14/8/01 First production release Denny Industrial Centre...
  • Page 16 D100 D105 +15V BAV99W DUAL SM -15V BAV99W DUAL SM +15V +15V D103 -15V Z100 BAV99W DUAL SM Z109A AUX L R110 TL072 SM SK2A +15V CD L 2K2 SM CDL1 R100 SK4B Z111A CD INPUT CD L TUNER L 0V_SIG R108 TAPEO1...
  • Page 17 D302 D304 BAS16W SM BAS16W SM Z301 Q305 +15V LM317T 2SA1964 Vout +15V3 SK300 Q306 BC846B D305 MOLEXPWR4 R303 D300 D301 BAS16W SM Q300 470R SM + C300 J112 +3.75V C304 1000u 35V 100N SM F300 R300 R302 + C306 330R SM D310+ 1K2 SM...
  • Page 18 A85 DISPLAY PCB L865C2_2.0 L865C2_2.0.SCH Update Box (Small) MICRO UPDATE_SML FD_1 FD_2 FIDUCIAL FIDUCIAL FIX7 FIX2 FIX10 FIX4 FIX5 FIX6 FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE FIXING HOLE CHASSIS 1 (BY SK3) 1N0 SM 0V_D 1N0 SM 1N0 SM 1N0 SM 1N0 SM...
  • Page 19 BC847B BC847B 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 10K SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM 1K5 SM...
  • Page 20 LEFT CHANNEL L870C2_2.0.SCH +15V LEFT IN LEFT OUT PHONO2HG 0V_SIG RIGHT CHANNEL 100N CD L870C3_2.0.SCH RIGHT IN RIGHT OUT 0V_SIG AMPCT8 -15V 0V_SIG 0V_HF DRAWING TITLE PCB1 A85 PHONO STAGE - TOP LEVEL Update Box Circuit Diagram 23425 UPDATE_BOX L870PB_2 Notes: 01_1070 17/4/01...
  • Page 21 +15V Q_102 C102 C104 100U SILMIC 100N PE C119 0V_HF 0V_SIG R100 R101 R102 330R MF 100R MF 100R MF 100P PP C101 TR100 TR102 BC556B TR103 1N0 PP BC556B BC556B C110 TR101 BC556B + C100 4N7 PP 22U EL C120 1N0 PP R109...
  • Page 22 +15V Q_202 C202 C204 100U SILMIC 100N PE C219 0V_HF 0V_SIG R200 R201 R202 330R MF 100R MF 100R MF 100P PP C201 TR200 TR202 BC556B TR203 1N0 PP BC556B BC556B C210 TR201 BC556B + C200 4N7 PP 22U EL C220 1N0 PP R209...
  • Page 23 +5V_D TP102 SK100 TP103 SPKR1 ON 0V_D TP104 SPKR2 ON TP105 THERMPROT TP106 VIPROT1 TP107 DCPROT1 TP108 +5V_D +5V_D R107 0V_SIG TH100 PTH90DEG FFC 14W 2.54MM VER 0V_D 2R2 SM IC100G C100 + C102 C101 SP100 0V_D IC100E PIN 1 TO THE LEFT AS YOU LOOK FROM THE FRONT TP116 74HC14D 100N SM...
  • Page 24 VPOS R319 100R SM R315 R316 R300 100R SM 100R SM PRE DRIVER 10K SM PNP CURRENT MIRROR TR310 TR300 TR301 FMMT497 FMMT597 FMMT597 R301 10K SM R321 TR302 C300 DZ300 100U EL TR309 22R SM FMMT597 15V 350MW SM FMMT497 TR321 FMMT597...
  • Page 25 +5V_D BC556B 10K MF 10K MF 10K MF 10K MF +5V_D BC556B 10K MF 10K MF 10K MF STANDBY 10K MF BC556B BC556B SPKR1 ON SPKR2 ON 560R MF 560R MF THERMPROT 1 330R MF 180R MF VIPROT 1 DCPROT 1 SP2 SW DCPROT AC PRESENT...
  • Page 33 PCB Bill of Materials ARCAM Document title: A85 POWER AMPLIFIER AND PSU Document number: L882RS Issue: 3 Revision: 2 ECO number: 01_1101A Date: 06/06/01 Created by: JR Page 1 of 3 (Excluding parts for NF.) Part Qty Iss Description Designators ******** PCB Finish items: ******** (For drawing office use only.
  • Page 34 PCB Bill of Materials ARCAM Document title: A85 POWER AMPLIFIER AND PSU Document number: L882RS Issue: 3 Revision: 2 ECO number: 01_1101A Date: 06/06/01 Created by: JR Page 2 of 3 2A410 CERD 100N 63V 20% RA C224 C225 C226...
  • Page 35 PCB Bill of Materials ARCAM Document title: A85 POWER AMPLIFIER AND PSU Document number: L882RS Issue: 3 Revision: 2 ECO number: 01_1101A Date: 06/06/01 Created by: JR Page 3 of 3 5D7805 IC VREG POS 7805 IC201 5J7414D SURFACE MOUNT HEX SCHMITT TRIGGER...
  • Page 36 PCB Bill of Materials ARCAM Document title: A85 PREAMPLIFIER Document number: L866RS Issue: 3 Revision: 1 ECO number: 01_1101 Date: 06/06/01 Created by: JR Page 1 of 3 (Excluding parts for NF.) Part Qty Iss Description Designators 1A022 RES SM W4 1% 22R 1206...
  • Page 37 PCB Bill of Materials ARCAM Document title: A85 PREAMPLIFIER Document number: L866RS Issue: 3 Revision: 1 ECO number: 01_1101 Date: 06/06/01 Created by: JR Page 2 of 3 2D210 PPRO 1N0 5% 63V RA C314 C315 2D222W WIMA FKP2 2N2 63V CAP...
  • Page 38 PCB Bill of Materials ARCAM Document title: A85 PREAMPLIFIER Document number: L866RS Issue: 3 Revision: 1 ECO number: 01_1101 Date: 06/06/01 Created by: JR Page 3 of 3 ******** Obsolete, absent, redundant, or incorrect issue in PDM: L866PB_3 X PRINTED CIRCUIT BOARD...
  • Page 39 PCB Bill of Materials ARCAM Document title: A85 / A32 Integrated amplifier preamp PCB Document number: L937RS Issue: 1 Revision: 1 ECO number: 01_E014 Date: 28/11/01 Created by: J Reckless Page 1 of 2 Part Qty Iss Description Designators 1A022...
  • Page 40 PCB Bill of Materials ARCAM Document title: A85 / A32 Integrated amplifier preamp PCB Document number: L937RS Issue: 1 Revision: 1 ECO number: 01_E014 Date: 28/11/01 Created by: J Reckless Page 2 of 2 2D210 PPRO 1N0 5% 63V RA...
  • Page 41 ARCAM PCB Bill of Materials Document title: A85 DISPLAY PCB Document number: L865RS Issue:2 Revision: 0 ECO number: 01_E028 Date: 13/02/02 Created by: Page 1 of 2 Part Qty Iss Description Designators 1A000 RES SM W4 2% 0R0 R58 R59 R48...
  • Page 42 ARCAM PCB Bill of Materials Document title: A85 DISPLAY PCB Document number: L865RS Issue:2 Revision: 0 ECO number: 01_E028 Date: 13/02/02 Created by: Page 2 of 2 B1013 MN12818A VFD ITRON DISP1 B2107 REMOTE RX PIC-26043TM2 38KHZ E916PM DISPLAY CRADLE E916PM...
  • Page 43 TITLE A85 PHONO PCB DWG. No. L870RS ISSUE 2.0 ECO No 01_1070 DATE 17-4-01 DRAWN BY JAG RUN-OUT SHEET SHEET 1 of 1 Part Qty Iss Description Designators 1H010 RES MF W4 1% 10R R123 R223 1H022 RES MF W4 1% 22R R118 R119 R120 R121 R218 R219 R220 R221 1H110...
  • Page 44 TITLE A85 PHONO PCB DWG. No. L870RS ISSUE 2.0 ECO No 01_1070 DATE 17-4-01 DRAWN BY JAG RUN-OUT SHEET SHEET 2 of 1 L870PB_2 X PRINTED CIRCUIT BOARD PCB1 *************************************************************************** *********************** Additions Since Last Issue ************************ *************************************************************************** Part Qty Iss Description Designators 2D210...
  • Page 45 PCB Bill of Materials ARCAM Document title: P85 THIRD CHANNEL Document number: L911RS Issue: 1 Revision: 1 ECO number: 01_1101 Date: 06/06/01 Created by: JR Page 1 of 2 Part Qty Iss Description Designators 1A000 RES SM W4 1% 0R0 1206...
  • Page 46 PCB Bill of Materials ARCAM Document title: P85 THIRD CHANNEL Document number: L911RS Issue: 1 Revision: 1 ECO number: 01_1101 Date: 06/06/01 Created by: JR Page 2 of 2 4B179 NPN TRANS MP BD179 TR100 TR101 4CSAP15N TRANS POWER NPN SAP15N...
  • 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 IC CMOS MICRO HT48R30 28-DIP-B-0...
  • Page 48 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 2 of 2 *************************************************************************** Part Qty Iss Description Designators A1504 TACT SWITCH 2-PIN LOW PROF SW1 SW2 L910PB_C PRINTED CIRCUIT BOARD...
  • Page 49 A85 General Assembly Parts List ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED L813RC REMOTE CONTROL L907TX TRANSF A85 100V REPLACE 7A9301 AT TX200 TRANSFORMER FITTED ON PCB L865AY ITEM 240V 115V 100V SILVER BLACK DESCRIPTION WHERE USED C12406 C12406 T4AL FUSE FUSE &...
  • Page 50 A85 General Assembly Parts List ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED HA6K60A TRANSBOLT HF4V09B No. 4 x 9mm SCREW REAR & MODULES HJ4A00A M4 NUT RR PAN ‘E’ EARTH HJ4C00D M4 WAISTED NUT RR PAN ‘E’ EARTH HL4SA WASHER HL4SB...
  • Page 51 P85 General Assembly ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED 5B483028 HOLTEK PLUS L819SW Z1 of L910AY 8K004 JUMPER SOCKET 0.1" M7571-05 8K006 CONNECTOR 14MM SHORTING BAR P2148 C12406 C12406 FUSE T4AT FUSE & SPARE FUSE HOLDER E031AY REAR PANEL ASSEMBLY E804HK HEAT-SINK...
  • Page 52 P85 General Assembly ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED L884TX L884TX L880TX A85P TRANSFORMER L910AY SWITCH PCB L915CA CABLE FFC 0.1" 14WAY A85 DISP - PWR E834CP E833CP COVER PLATE E974AY E990AY FACIA ASSY HA4V06S HA4V06B M4 X 6mm SCREW...
  • Page 53 P85/3 General Assembly ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED 5B483028 PIC CHIP + L819SW 8K004 2 WAY JUMPER SKT 8K006 CONNECTOR 14MM SNORTING BAR P2148 C12406 C12406 FUSE 20MM 4AT FUSE & SPARE FUSE HOLDER E031AY REAR PANEL ASSEMBLY E804HK HEAT-SINK E804MI...
  • Page 54 P85/3 General Assembly ITEM 230V 115V 100V SILVER BLACK DESCRIPTION WHERE USED HA5L20B M5 x 20MM HEX HEAD BOLT BLACK CLAMP E912MC TO E804HK / ST=L E806HK HA6K60A M6 x 60mm BOLT TX FXG HF4V09B No. 4 x 9mm SCREW REAR HJ4A00A M4 NUT...

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