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Loewe Concertos Acoustimass 61247 Service Manual

Bassmodul
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General Description
Adjustment Procedures
Block / Schematic Diagrams
Exploded Views / Parts List
Concertos
Acoustimass ®
Bassmodul
Art.-Nr. 61247
SOUND BY
BOSE ®
230-90374.921

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Summary of Contents for Loewe Concertos Acoustimass 61247

  • Page 1 General Description Adjustment Procedures Block / Schematic Diagrams Exploded Views / Parts List Concertos Acoustimass ® Bassmodul Art.-Nr. 61247 230-90374.921 SOUND BY BOSE ®...

  • Page 2: Table Of Contents

    Contents Page Safety Information......................3 Electrostatic Discharge Sensitive (ESDS) Device Handling..........4 Loewe Serie II Acoustimass Bassmodul General..........................5 Design Features........................6 Product Specifications......................8 User Interface........................9 Graphs and Curves......................18 Electrical Specifications....................28 Environmental and Reliability Specification..............31 Quality..........................32 Packaging.........................32 Safety and Regulatory......................32 Variants..........................32 Analog/Digital Source Switching Flowchart..............33 Glossary...........................34...

  • Page 36: Scope

    SCOPE This document describes the functional test specifications for the Loewe (Beethoven) dig- ital signal processing PCB. It is identical to the AM25/30P Series II PCB assembly test specification 197296 except for firmware revision noted in Section 3.8, 3.9, and 3.10.
  • Page 37 There are several major blocks in the signal flow block diagram: Microcontroller The microcontroller manages the serial data interface the outside world and the DSP signal processing system, mutes and un-mutes the power amplifiers, stores and retrieves EEPROM data, and mon- itors temperature and other indicators of bassbox health.

  • Page 38: General Test Setup

    I/O Connectors 13-pin DIN 18-pin ribbon cable GENERAL TEST SETUP Power Requirements Signal Pinout Voltage Max. Cur- Name rent +17 V J8_3 +11 V -- +19V 250 mA +12 V J8_1 +12V ± 10% 50 mA -12 V J8_5 -12V ± 10% 50 mA ground J8_2, J8_4...
  • Page 39 Note that the ubiquitous PC COM port generates RS-232 with ± 12V logic levels, and can- not be connected directly to the board (although no damage will occur). An RS232-to-TTL level converter such as BB Electronics Model 232TTL is recommended, along with a suit- able test cable.
  • Page 40 3.) The serial data output uses 4800 baud RS-232 timing (8 bits, no parity), but with 5V logic levels (0 = 0V, 1 = 5V), not RS-232 logic levels (typically 0 = +12V, 1 = –12V). 4.) The SPDIF input expects a 500mVpp digital bitstream at approximately 3MHz. It is recommended that 75W coax cable be used all the way from the signal source to J5.

  • Page 41: System Performance Specifications

    2.5.4 Leave the “protect” input (J8 Pin 6) floating. 2.5.5 Leave the “clip” input (J8 Pin 14) floating. 2.5.6 Wait at least 2 seconds after a successful boot for transients on the audio outputs to settle before making DC or AC measurements. Notes on Serial Data I/O 2.6.1 ASCII commands issued from the tester to the PCB via the serial data input will be shown in this document as follows:...
  • Page 42 Clear EEPROM Issue the command: ef ff Within 2 seconds, expect the response: > Reset uC and initialize EEPROM Issue the command: Within 500msec, expect the response: >--I6++ >#0001%01 Each text string in the response from the PCB is explained below: 3.6.1 ** Indicates that the microcontroller has just come out of reset.

  • Page 43: Firmware

    Initialize EEPROM checksum Issue the command: ce 0 Within 500 msec, expect the response: > Microcontroller and DSP code revisions The test limits described in this document may depend on which revision of either the mi- crocontroller or DSP code is present. The microcontroller must have successfully booted.
  • Page 44 In this example, the checksum is "17B2E0" (ignore the leading zeroes) 3.9.1 Microcontroller CheckSum uC Firmware Revision Bose Part Number CheckSum (hex) Loewe Part Number 261396 001E0406 350-90370.994 3.10 DSP checksum Perform a DSP checksum test ONLY if the microcontroller firmware revision (as deter- mined in test 3.8) is Version 35 or higher.
  • Page 45 The hex number following the string "DSPke" is the DSP firmware revision number. In this example, the checksum is "25E2C24" (ignore the leading zeroes). DSP Firmware CheckSum DSP Firmware Revision Bose Part Number CheckSum Loewe Part Number 262234-004 025886EB 350-90371.988 3.11 Offset at analog outputs Measure the DC offset at each of the 6 analog outputs (B, L, C, R, LS, RS): 3.11.1...
  • Page 46 Issue the command: dp 20,0,2,0,12 Within 500msec, expect the response: DSPkexxxxxxxx > where "xxxxxxxx" is a text string which encodes the signal strengths measured at he input. Take, for instance, the string: EF2BEE2A Break this last 8-character response into four 2-character hex numbers, e.g., “EF2BEE2A” becomes "EF 2B EE 2A”.
  • Page 47 3.13 Test signal loopback, via ADC -- B,C outputs to L,R inputs Connect the B output (J8 Pin 10) directly to the L input (J5 Pin 9). Connect the C output (J8 Pin 11) directly to the R input (J5_1). Issue the command: tn 5,5,f6,0,0,1,f6,0,0 Within 500msec, expect the response:...
  • Page 48 3.14.3 RS distortion: -45 dB (max.) 3.14.4 RS signal: -4 dB (min.) 0dB (max.) 3.15 Test signal loopback via SPDIF receiver -- LS, RS outputs to SPDIF input Test the SPDIF digital receiver function of the codec. Connect the LS output (J8 Pin 12) and the RS output (J8 Pin 13) to the L,R inputs of the SPDIF signal generator.

  • Page 49: Appendix A - Errors Reported At Boot Time

    APPENDIX A -- ERRORS REPORTED AT BOOT TIME CRC check of frequently written EEPROM parameters failed. Attempt to re-init corrupt EEPROM header failed. Successful initialization of EEPROM. codec communication fault codec voltage reference out of bounds codec clock would not lock SPDIF clock errors detected DSP1 communication time out DSP1 communication parity error...

  • Page 50: Appendix B - Hex Notation

    APPENDIX B -- HEX NOTATION HEX notation, +127 to -128 (only every other value reported for compactness) Note; the MSB is the “sign” bit. If the MSB is a “1”, the number is negative, while if the MSB is a “0”,the number is positive. E.g., “0x80” is MINUS FULL-SCALE, while “0x7F” is POS- ITIVE FULL-SCALE.

  • Page 51: Scope

    (J700 and J701) is NOT backwards compatible with AM-25P. GENERAL TEST SETUP Power Transformer Transformer Loewe P/N 90371.962 shall be used to power the PCB assembly. The secondary of this transformer is equipped with a connector designed to mate with J702 on the ampli- fier pcb.
  • Page 52 Signal Inputs signal name location characteristic notes B in J700 pin 2 bass audio input Do NOT exceed 2KHz (note 1). L in J700 pin 10 left audio input C in J700 pin 9 center audio input R in J700 pin 12 right audio input LS in J700 pin 7...
  • Page 53 J701 pin 7 ls, rs audio return (note 2) J701 pin 6 right surround audio output J701 pin 7 ls, rs audio return (note 2) Notes: 1.) The bass amplifier output is not short-circuit proof. Take care when connecting or dis- connecting a load.

  • Page 54: System Performance Specifications

    SYSTEM PERFORMANCE SPECIFICATIONS In-circuit test Due to the limitations of functional (input/output) testing and the number of components that do not have direct effect on functional performance (EMI capacitors, RC time con- stants, etc.), it is mandatory that the PCB assembly be in-circuit tested at component level (nonpowered) to confirm all surface mount resistor and capacitor values.
  • Page 55 DC Offset After a successful power-up, confirm that no DC offset exists at each of the six audio out- puts. Ground all 6 audio inputs. Disconnect the loads from the audio outputs. Apply 5V to all 3 mute inputs to un-mute the amplifiers. Measure the voltage at each output: 3.3.1 B out, J702_2 |dc offset| <...
  • Page 56 Measure the gain (relative to the input signal) at each amplifier output in turn, at the follow- ing frequencies: 3.6.1 100Hz gain 11.5dB ± 2dB 3.6.2 15KHz gain 11.5dB ± 2dB L,C,R,LS,RS channel noise (A-weighted RMS) Apply +5V to the mute inputs to un-mute the amplifiers. Disconnect the 8W load from the output of the L,C,R,LS,RS amplifiers.
  • Page 57 3.10 Power-off Disconnect the AC mains voltage. Discharge the ±34V and ±17V supplies to a magnitude of less than 0.5V before removing the pcb from the test fixture. (Keep the discharge current to less than 0.5A.) SIZE FSCM CLASS DWG NO. SHEET REV.

  • Page 58: Packaging Assambly View

    R E F PAC K AG ING AS S E MB LY V IE W...

  • Page 62: Pcb Dsp Sd 251 571 Sheet 1 Of 5

    CLASS DWG NO. 251571 REVISIONS +3.3V BYPASS BYPASS DESCRIPTION DATE C117 C118 PG 6 +3.3V +3.3V REVISED PER ECN26825-SHT 3 R314,R315,C312 N.U. 10/4/99 +3.3V TP179 TP181 +12V +12V J8-1 U101 U102 C155 DSP1-RFS1 R161 DSP2-DT1 -12V -12V J8-5 SDIN1 100pF TP147 R132 TP148...

  • Page 63: Pcb Dsp Sd 251 571 Sheet 2 Of 5

    CLASS DWG NO. 251571 SHIELD R264 +5V-REG C205 C218 33pF TP221 X600 MICROCONTROLLER 8MHz C206 TP232 U202 TP231 33pF R201 TP265 R202 TP200 R211 XOUT VAREF CMOUT 301K C207 C208 M200 C200 RESET 2.2/16V R280 U200 RESET MAX809x TP270 RESET SHIELD P10(INT0) R268...

  • Page 64: Pcb Dsp Sd 251 571 Sheet 3 Of 5

    CLASS DWG NO. 251571 M306 CABLE-CONT M301 MUTE-LR M302 MUTE-C M303 MUTE-LSRS M304 CLIP M305 RS-EQAUD M307 LS-EQAUD M308 B-EQAUD M309 TP308 C-EQAUD M310 +12V L-EQAUD M311 AMP-GND-SENSE M312 J5-7 BAV99L R-EQAUD TP305 TURN-ON M313 PROTECT D301 M314 -12V M360 M315 Q300 +17V-FUSED...

  • Page 65: Pcb Dsp Sd 251 571 Sheet 4 Of 5

    CLASS DWG NO. 251571 DSP1 DATA47 DATA46 DSP1 DATA45 DATA44 DATA43 IRQ2 DSP1-IRQ2 DSP1-TDI DATA42 IRQ1 +3.3V +3.3V TRST TRST DATA41 IRQ0 +3.3V DSP1-TD0 DATA40 +3.3V +3.3V ADDR31-1 R425 EBOOT +3.3V DATA39 ADDR31 ADDR30-1 R425 DATA38 ADDR30 3.9K 3.9K 3.9K 3.9K LBOOT R425...

  • Page 66: Pcb Dsp Sd 251 571 Sheet 5 Of 5

    CLASS DWG NO. 251571 R510 TP510 +3.3V DSP1 DSP1 Q500 L0DAT3 L5ACK 2SC3395 L0DAT2 L5CLK R500 L0DAT1 L5DAT0 48.7K L0DAT0 L5DAT1 U500 L0CLK L5DAT2 SYNC L0ACK L5DAT3 C506 TP504 L1DAT3 L4ACK C501 TP505 0.47uF OUT1 V5.1 .0012 L1DAT2 L4CLK GND7 L1DAT1 L4DAT0 GND1...

  • Page 67: Pcb Amp Sd197 228 Sheet 1 Of 2

    CLASS DWG NO. 197228 REVISIONS DESCRIPTION DATE +34V +34V +34V +34V R773 1.0K R730 TIP146T 1.0K Q715 TIP146T Q705 C753 R733 R725 D711 .0033 CMP_BIAS R740 CMP_BIAS 100K 100K +17V C741 1N5402 U702 C714 U702 C709 119168 R778 R774 Q704 CMP_OUT 0.47 R741...

  • Page 68: Pcb Amp Sd197 228 Sheet 2 Of 2

    CLASS DWG NO. 197228 FTP705 J700 MUTE_LR FTP700 J700 7294_STBY_LR FTP708 R715 D713 J700 274K FTP701 BAV99L C701 TP702 7294_STBY_C J700 1.00K TP707 FTP709 R813 R814 R815 R724 D714 R717 R716 J700 CMP_OUT 274K BAV99L 274K FTP702 C700 J700 RS_EQAUD TP700 7294_MUTE_LR FTP703...

  • Page 81: Spare Part List

    LOEWE. Ersatzteileliste für Artikel : 61247 SPARE PART LIST Concertos Acoustimass Modul Änderungen und Liefermöglichkeiten vorbehalten ! POSNR. KURZTEXT ENTF-DAT. BESTELLNR. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE VERPACKUNGSMATERIAL PACKING MATERIAL KARTON-AUFKLEBER CONCERTOS-PLATIN ADHESIVE LABEL 220-90370972 KARTON-AUFKLEBER CONCERTOS-BASALT ADHESIVE LABEL 220-90371928 VERPACKUNGSKARTON - CONCERTOS...
  • Page 82 POSNR. KURZTEXT 61247 BESTELLNR. ENTF-DAT. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE DSP2 IC ADSP21061L DSP, QFP240 INTEGRATED CIRCUIT 350-90370976 IC L78M05 DPAK INTEGRATED CIRCUIT 349-90371949 U100 ICMOS CS4226-KQ INTEGRATED CIRCUIT 350-90371968 U101 IC 74LCX244 INTEGRATED CIRCUIT 350-90371987 U102 IC 74ACT244 INTEGRATED CIRCUIT 350-90372924 U103 IC TLO74D...
  • Page 83 POSNR. KURZTEXT 61247 BESTELLNR. ENTF-DAT. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE Q700 TRANS TIP146T DARL, P, 80V, 15A TRANSISTOR 346-90371933 Q701 TRANS BPLR TO-92 60V P 0,2A TRANSISTOR 346-90371952 Q702 TRANS BPLR TO-92 60V N 0,2A TRANSISTOR 346-90371971 Q703 TRANS BPLR TO-92 60V N 0,2A TRANSISTOR 346-90371971...
  • Page 84 POSNR. KURZTEXT 61247 BESTELLNR. ENTF-DAT. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE D711 DIODE 1N5402 DIODE 352-90370995 D712 DIODE 1N5402 DIODE 352-90370995 D713 DIODE BAV 99 SOT23 LV030 DIODE 351-18831 D714 DIODE BAV 99 SOT23 LV030 DIODE 351-18831 D715 DIODE BAV 99 SOT23 LV030 DIODE 351-18831...
  • Page 85 POSNR. KURZTEXT 61247 BESTELLNR. ENTF-DAT. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE R141 10K F 0805 LV364-1 LV030 RESISTOR 364-23063 R142 WIDCH 60K4 F 0W1 0805 RESISTOR 364-90374996 R146 10K F 0805 LV364-1 LV030 RESISTOR 364-23063 R147 WIDCH 60K4 F 0W1 0805 RESISTOR 364-90374996 R151 10K F...
  • Page 86 POSNR. KURZTEXT 61247 BESTELLNR. ENTF-DAT. ITEMNMB DESCRIPTION LIST-PART-NMB LAST-DATE R752 WIDCH 49K9 F 0W125 1206 RESISTOR 364-90374957 R753 WIDCH 2K49 F 0W125 1206 RESISTOR 364-90374938 R754 WIDCH 24K9 F 0W1 0805 RESISTOR 364-90375932 R755 WIDCH 2K49 F 0W125 1206 RESISTOR 364-90374938 R756 WIDCH 49K9 F 0W125 1206...

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