Service Manual P7 Issue 1.
Contents List Section Issue Technical specifications ! ! Technical specification Rear panel silk screen - Amplifier board L924 ! ! ! ! Circuit description Component overlay Parts list Circuit diagrams 1.0 1.1 1.1 Controller board L925 ! ! ! ! Circuit description Component overlay Parts list Circuit diagrams 1.0 1.2 1.2 Transformer specifications ! ! ! ! L911TX L912TX L920TX L921TX 1.0 1.0 1.0 1.
Technical Specifications Contents ! Technical specifications ! Rear panel silk screen
Technical Specifications All measurements are with 230V/50Hz mains power Continuous output power All channels driven, 20Hz – 20Khz, 8 ohm All channels driven, 20Hz – 20kHz, 4 ohm One or two channels driven at 1kHz, 8 ohm One or two channels driven at 1kHz, 4 ohm One or two channels driven at 1kHz, 3.
6 R SURR 7 RS BACK 5 RIGHT POWER INLET ~ 3 LEFT CAUTION – SHOCK HAZARD, DO NOT OPEN. ACHTUNG – VOR OEFFNEN DES GERAETES NETZSTECKER ZIEHEN. ATTENTION – RISQUE DE CHOC, NE PAS ENLEVER. PRECAUCION – PELIGRO DESCARGA, NO ABRIR.
Amplifier Board L924 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams
P7 Amplifier Module Circuit Description Refer to L924 circuit diagrams Introduction L924 is the power amplifier module for the P7 multichannel amplifier. There are 7 identical modules in the P7. The circuit design is based on the A85 / A32 output stage topology. The main features of the amplifier module are as follows: • • • • • • • • • • • • • Preset ‘THX’ gain (29dB closed loop gain).
Transistors TR200, TR201 and TR202 form a PNP Wilson current mirror. Likewise TR205, TR207 and TR206 form an NPN Wilson current mirror. The outputs of these two current mirrors are connected together via the bias network around TR212. The two current mirrors combine to provide a very high-gain current to voltage (transresistance) gain stage, which provides all the voltage gain of the amplifier (roughly 80dB at low frequency). IC200B forms the DC integrating servo.
L924 Amplifier Module Parts List Issue 1.
L924 Amplifier Module Parts List Issue 1.1 Designator Part Description R211 R212 R213 R214 R216 R217 R218 R219 R220 R221 R222 R223 R224 R225 R226 R227 R228 R229 R230 R231 R232 R233 R234 R235 R236 R237 R238 R239 R240 R241 R242 R245 R246 R247 R248 R249 R250 R254 R255 R257 R300 R301 R302 R303 R304 R305 R306 R307 R310 R311 R314 R315 R316 R320 R321 R332 R333 R334 R335 R336 R337 R338 Resistor 1206 Surface Mount 0.25W 1% 27K Resistor 1206 Surface Mount 0.25W 1% 27K Resistor 1206 Surface Mount 0.
L924 Amplifier Module Parts List Issue 1.1 Designator Part Description R339 R340 R341 R342 R343 RLY101 RV200 SK103 SK104 SK105 SK300 SK301 TH300 TR200 TR201 TR202 TR203 TR204 TR205 TR206 TR207 TR208 TR209 TR210 TR211 TR212 TR213 TR214 TR215 TR216 TR300 TR301 TR302 TR305 TR309 TR310 TR311 TR312 TR313 Z100 Z101 Z102 Z103 Z104 Z105 Z106 Z107 Z108 Z109 Z110 Resistor 1206 Surface Mount 0.25W 1% 330R Resistor 1206 Surface Mount 0.25W 1% 10K Resistor 1206 Surface Mount 0.
To microprocessor PCB NB: Signals THERMPROT, VIPROT, DCPROT and FAULT are open collector outputs, active low, referenced to 0V_DIG with no pull up resistors Inputs SK103 PHONO2G EMC TP100 INPUT PL100 1 2 +24V_DIG TP103 0V_DIG TP104 TP105 C103 100N SM TP106 TP107 TP108 TP109 D101 BAS16W SM RLY101B RLY G2R-1E-24DC 16A SPDT Electrical ground star point BASE1 BASE2 L924C3 L924C3_1.1.
+55V R219 220R MF R210 27K SM D200 BAS16W SM R214 47R SM R211 27K SM R216 47R SM C208 100N X7R 1812 500V PNP current mirror TR200 FMMT597 TR201 FMMT597 + C203 100U EL DZ200 15V 350MW SM TR202 TR PNP 2SA1740 C205 R221 0V_HF 3K3 SM C212 Pre driver 100P/250V TR209 TR NPN 2SC4548 IC200B TL072CD TR208 FMMT497 R240 6 7 R207 100R SM R245 22R SM 1M0 SM 5 TP203 TP200 IC200A TL072CD 1 1K0 SM TP202 2 R228 22K SM DZ203 4V7 350MW SM R229 22R MF C210 470P PPW TP201 R230 22R MF TR211 SAP15
+55V IC300C OPTO-PC3Q66-QUAD-SM FAULT IC300B OPTO-PC3Q66-QUAD-SM VIPROT IC300A D308 22V 350MW SM DC BASE1 R321 22K SM R320 22K SM D300 BAS16W SM OPTO-PC3Q66-QUAD-SM C300 100N SM 0V_DIG Instant SOA limiting D301 15V 350MW SM + C301 100U EL 0V_DIG 0V_DIG R342 120K SM R305 10K SM TR311 FMMT497 R307 39K SM TR300 FMMT497 R306 10K SM R338 D303 BAS16W SM TR309 FMMT497 R302 0V_HF 100R SM R300 100R SM R303 22K SM TR301 FMMT597 100R SM R340 10K SM + C318 100U EL R343 100K SM R337 1K S
Controller Board L925 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams
P7 Controller Circuit Description power relays ensures that relay RLY101 never switches high voltages and its contacts remain clean. The Amp controller PCB Panel consists of 6 PCBs. ! ! ! ! ! Controller PCB Display PCB Connector PCB Mains Switch PCB 2x Wire Clamp PCBs Overview The controller PCB contains the microprocessor and most of the circuitry for controlling the P7 amplifier. The display PCB provides the LEDs and resistors for the simple 7 LED display for the front panel of the unit.
that the PWM_OUT signal duty cycle can move the output of the amplifier over the required range. C104, C113 provide suppression for EMC and C112 provides amplifier loop compensation. The supply to the fan is fused by F101 this fuse limits current in the event of the fan stalling. If the fuse blows the watchdog timer cct immediately switches off the power relays to ensure failsafe condition.
it can be indicated on the front panel display) each module also provides an address line. A fault occurring on a particular module will cause both the fault line to be low and also the address line. In this way the amplifiers can be monitored by the controller through a total of 10 lines. that is averaged to 2.5V by the filter R114, C110. The voltage is then fed to the window comparator formed around IC104.
L925 Controller Board Parts List Issue 1.
L925 Controller Board Parts List Issue 1.
L925 Controller Board Parts List Issue 1.2 Designator Part Description R135 R136 R137 R200 R201 R202 R300 R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R313 RC100 REG100 RELAY100 RELAY101 SK100 SK101 SK102 SK103 SK104 SK105 SK106 SK107 SK108 SK109 SK110 SK111 SK112 SK113 SK114 SK200 SK201 SK300 SK301 SK302 SW300 TH100 TR100 TR101 TR102 TR103 TR104 TR105 TR106 TR107 TR108 TR109 TR110 TR111 TR112 TR113 TR114 TR115 TR116 X100 Resistor Metal Film 0.25W 1% 4K7 Resistor Metal Film 0.
Control PCB L925CT1_1.2.SCH Interface PCB L925CT2_1.2.SCH DRAWING TITLE Main Switch and LED Display L925CT3_1.2.sch P7 Amp Controller 23425 A & R Cambridge Ltd. Pembroke Avenue Waterbeach Cambridge CB5 9PB Filename: L925CT0_1.2.Sch Notes: KAL 20/03/02 02_E054 KAL 7/03/02 CHANGED C121 VALUE. REMOVED SOFT START PROTECTION 1.1 02_E041 KAL 7/02/02 PRODUCTION ISSUE PCB CHANGES ONLY 1.0 INITIALS DATE Printed: 18-Apr-2002 ECO No.
FIX100 FIXING HOLE 3.2 FIX102 FIXING HOLE 3.5 FIX103 FIXING HOLE 3.5 FIX101 FIXING HOLE 3.2 FIX104 FIXING HOLE 3.5 FIX105 FIXING HOLE 3.
+22VD_SW2 ARELAY1* RELAY1 TP200 ASIG_PRES* AFLT_TEMP* AFLT_VI* AFLT_DC* FIX202 FIX200 FIX203 FIX204 FIX205 FIX206 FIX207 FIX201 FIXING HOLE 3.5 FIXING HOLE 3.2FIXING HOLE 3.5FIXING HOLE 3.5 FIXING HOLE 3.5 FIXING HOLE 3.5 FIXING HOLE 3.5 FIXING HOLE 3.2 PL200 1 2 3 4 5 6 7 8 9 10 AFAULT1 CON 10W 0.1 HDR CHASSIS GND2 +22VD_SW2 ARELAY2* RELAY2 TP201 PL201 1 2 3 4 5 6 7 8 9 10 ASIG_PRES* AFLT_TEMP* AFLT_VI* AFLT_DC* AFAULT2 CON 10W 0.
SK301 1 2 SW300A MAINS_SW A1007 8K2402 R303 220R MF R304 220R MF R305 220R MF R306 220R MF R307 220R MF R308 220R MF R309 220R MF R310 220R MF R311 220R MF MAINS_SW1 BGRN7 BRED7 BGRN6 BRED6 BGRN5 BRED5 BGRN4 BRED4 BGRN3 BRED3 BGRN2 R302 220R MF R312 220R MF R313 220R MF 1 2 SK302 8K2402 G R GND3 LED303 LED RED/GRN G R GND3 LED302 LED RED/GRN G R GND3 G R G GND3 LED301 LED RED/GRN R G GND3 LED300 LED RED/GRN BRED1 BRED2 BRED3 BRED4 BRED5 BRED6 BRED7 BGRN1 BGRN2 BG
Transformer Specifications Contents ! L911TX Power amp 115/230VAC ! L912TX Aux 115/230VAC ! L920TX Power amp 100VAC ! L921TX Aux 100VAC
1 2 3 Transformer Specification For 115/230V P7 transformer 4 5 6 7 8 Connector Latch SECONDARY 145mm dia max Arcam Part Number L911TX RED Material Safety Specification 1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995 6 5 4 3 2 1 2 1 2 1 OR 2. Mylar Polyester Insulator 130C Rated RED 6 way 2 way Pin outs of Molex connectors As viewed looking down at the end the wires enter the connector 3. Potting Compound PC3502 E135297(M) Mechanical Specification 1.
1 2 4 3 Transformer Specification For 115/230V P7 Auxilliary Transformer Arcam Part Number L912TX PRIMARY SECONDARY TEST CIRCUIT Amthyst Part Number AD3595T VOUT 1 6 WAY CONN PIN 3 D BROWN RED 4 WAY CONN PIN 3 Material Safety Specification D 115V ac 1N4003 6 WAY CONN PIN 1 WHITE 6 WAY CONN PIN 6 BLACK ORANGE 1N4003 1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995 4 WAY CONN PIN 4 500mA load 2.
1 2 3 Transformer Specification For 100V P7 Amplifier 4 5 6 7 8 Connector Latch SECONDARY 145mm dia max Arcam Part Number L920TX RED Material Safety Specification 1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995 6 5 4 3 2 1 2 1 2 1 OR 2. Mylar Polyester Insulator 130C Rated RED 6 way 2 way Pin outs of Molex connectors As viewed looking down at the end the wires enter the connector 3. Potting Compound PC3502 E135297(M) Mechanical Specification 1.
1 2 4 3 Transformer Specification For 100V (JAPAN) P7 Auxilliary Transformer Arcam Part Number L921TX PRIMARY SECONDARY TEST CIRCUIT Material Safety Specification VOUT 1 6 WAY CONN PIN 3 D BROWN RED 4 WAY CONN PIN 3 1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995 D 100V ac 1N4003 6 WAY CONN PIN 1 WHITE 6 WAY CONN PIN 6 BLACK ORANGE 1N4003 2. Mylar Polyester Insulator 130C Rated 4 WAY CONN PIN 4 500mA load 3.
Mechanical Assembly Contents ! General assembly parts list ! Assembly diagrams Front panel TX tray Rear panel Chassis
P7 General Assembly Parts List – issue 4 ITEM 240V 115V 100V SILVER E065AY E844CP E934MC BLACK E065AYB E844CPB E934MCB HA4V06S HA4V06B DESCRIPTION WHERE USED QTY FASCIA ASSEMBLY COVER POWER BUTTON FITS TO FRONT OF CHASSIS FITS ONTO POWER SWITCH SCREW MACHINE M4x6mm PAN TORX STAINLESS-STEEL NICKEL-PLATED SCREW MACHINE M4x6mm PAN TORX STAINLESS-STEEL BLACK 1 1 1 COVER TO CHASSIS 8 E801SL E802SL VOLTAGE LABEL ON REAR PANEL OVER 230V TEXT 1 SL024 SL092 VOLTAGE LABEL ON CARTON LABEL OVER
P7 General Assembly Parts List – issue 4 ITEM 240V 115V 100V SILVER BLACK DESCRIPTION WHERE USED QTY ZINC-PLATE CLEAR HA4D06A SCREW MACHINE M4x6mm PAN POZI STEEL NICKEL-PLATED SCREW MACHINE M5x12mm HEX STEEL ZINCPLATE BLACK FAN BRACKET (3) CHASSIS SAFETY EARTH (1) AND TRANSFORMER EARTH SCREEN WIRE (1) MODULE TO TRAY 5 HA5L30B SCREW MACHINE M5x30mm HEX STEEL ZINCPLATE BLACK AUX TX TO TRAY 1 HA5W10B SCREW MACHINE M5x10mm BUTTON HEXSOCKET STEEL ZINC-PLATE BLACK TRAY TO CHASSIS 8 HA6L60B S
ARCAM All parts can be ordered via spares@arcam.co.