Bose Personalized Amplification System Troubleshooting Manual Download | Manualshive

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6

Note:

Refer to PS1 Power Stand schematic sheets in the service manual, reference number

264018-SM, for the following information. The information inside the brackets [ ] is the
component’s grid location on the schematic sheet.

The PS1 Power Stand combines the traditional functions of a mixer, digital controller (system
EQ and limiter), power amplifier and mechanical speaker stand. Figure 1 on page 3 shows the
signal flow through the power stand.

The power stand consists of five parts: a switching power supply, 3 channels of amplification on
a common PCB, and input panel PCB, DSP PCB, and MCU PCB. The power supply connects to
the MCU PCB via a the 8 pin connector CN409 [microprocessor PCB sheet 2, A1], four chan-
nels of analog inputs on the panel are connected to the DSP PCB via a 6 pin connector CN104
[DSP PCB sheet 1, B1], analog output signals on the DSP panel are connected to input panel
via a 3 pin connector CN115 [input panel PCB sheet 2, D1]. SPDIF IN on the input panel is
connected to the DSP PCB via a 2 pin connector CN112 [DSP PCB sheet 2, B4], SPDIF OUT
on the DSP PCB is connected to input panel via a 2 pin connector CN113 [DSP PCB sheet 2,
C8].

For Channel 1 or 2 the signal is input either through the balanced XLR connector or through the
¼” unbalanced connector. The ¼” connector has a very high impedance (900k ohms) to allow
direct connection of passive guitars or bass guitars. The signal is then amplified by the adjust-
able pre-amplifier. After the pre-amplifier, the signal can be accessed at the balanced XLR line
level output.

Next the signal is routed through a digitally controlled analog volume control. Then, the signal is
routed through the insert loop connector. If there is no plug in the insert jack, the signal will be
routed through. Otherwise the signal will be routed to the “ring” of the connector and is expected
to return from the “tip”. The signal is then digitized in the A/D converters and processed in
software. Software provides the following functions.

•

Channel 1&2: measuring level for LED

•

Channel 1&2: noise gate

•

Channel 1&2: preset EQ

•

Channel 1&2: channel volume

•

Sum channels 1 to 4

•

Master Volume Control

•

System EQ and crossover (for L1 and B1)

•

Limiter & soft clipper (for L1 and B1 amplifiers)

Signal Processing

Signal processing is mainly implemented by the DSP and includes the following functions:

•

Noisegate & limiter

•

Tone control & volume control

•

Parameter equalize & System equalizer

•

Clip calculate

The signal flow chart is as follows (refer to figure 1):

THEORY OF OPERATION

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Summary of Contents for Personalized Amplification System

Page 1: ...ntrol 5 Figure 5 DSP Functional Block Diagram 7 Figure 6 DC Power Supply Block Diagram 7 Table 1 Adjustable Controls Gain range and nominal settings 12 Table 2 Nominal and Peak Signal Levels 13 Table 3 LED Trigger Levels 14 Figure 7 Nominal Bass Configuration 2 Bass Modules 14 Figure 8 Light Bass configuration 15 Figure 9 External power stand total of 4 bass modules 15 Figure 10 Heavy Bass total o...

Page 2: ...IED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMI NATED BEFORE RETURNING THE UNIT TO THE CUSTOMER B Insulation Resistance Test Cold Check 1 Unplug the power supply and connect a jumper wire between the two prongs of the plug 2 Turn on the power switch of the unit 3 Measure the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on the unit ...

Page 3: ...3 THEORY OF OPERATION Figure 1 PS1 signal flow Diagram ...

Page 4: ...Remote control The ability to receive analog signal input and SPDIF digital signal input The ability to output analog signal and SPDIF digital signal Channel volume control Master volume control Mixer Tone control 100 sets of parameter equalizer System equalizer for compensating speaker characteristic Noisegate Limiter Clip indicator DSP software update and 100 sets of preset coefficients update P...

Page 5: ...nput signal headroom is 2 1Vrms max A user could operate the system from the input panel and the remote refer to figures 3 and 4 Figure 3 Powerstand Input and Output Connections Figure 4 R1 Remote Control THEORY OF OPERATION Channel 1 2 Unbal Unbal Channel 3 4 Power amp patch bass remote and AC power connections TRS Bal Unbal Commercial Audio P r oduct 917D R1 remote control 0 0 12 12 CH2 HIGH MID...

Page 6: ... 2 C8 For Channel 1 or 2 the signal is input either through the balanced XLR connector or through the unbalanced connector The connector has a very high impedance 900k ohms to allow direct connection of passive guitars or bass guitars The signal is then amplified by the adjust able pre amplifier After the pre amplifier the signal can be accessed at the balanced XLR line level output Next the signa...

Page 7: ... 24V 27V and 27V Refer to the block diagram below Figure 6 DC Power Supply Block Diagram THEORY OF OPERATION DSP Processing Block Diag Ch1 2 Preset Remote Ch1 In Ch2 In Ch 3 In Ch 4 In Hi Out Bass Out Sys EQ X Over Hi L R S DATA Out Limiter User EQ Preset EQ NoiseGate User EQ Preset EQ NoiseGate to SPDIF Master Vol Range 80 to 22dB 10 12 00 Sys EQ X Over Lo Limiter Knee 1 5dBV ...

Page 8: ...lose time of switch circuit to regulate the transformer primary1 accord ingly the voltage of transformer1 secondary will keep stable Of course in this way the effect of stabilization for 3 3V is best and that for other voltage is worse The regulation of the power supply for AMP is like this we get the 27V as feedback signal and send it to switch control auxiliary circuit2 When system works if 27V ...

Page 9: ... CheckSum to the DSP The communication adopts software simulation UART with two I O pin as RX and TX Communication rate is 4800bps add start bit and stop so every sending byte has 10 bits Data is send according to frame format every data check sum DSP will transfer a frame every 100ms and every sending will take about 30ms Control channel volume IC Because the design requires that the channel sign...

Page 10: ... U386 U385 U387 U431 and U435 include the following functions U386 Two channels of 24 bit ADC one for Ch1 analog input and one for Ch2 analog input The ADC will input signal levels in levels in excess of 2Vrms Master mode U385 Two channels of 24 bit ADC one for Ch1 analog input and one for Ch2 analog input The ADC will input signal levels in levels in excess of 2Vrms Slave mode U387 Two channels o...

Page 11: ...h 18 are used An external data bus 32 bits of which 8 are used Bus control signals Finally the signals are brought out through a D A stereo converter The left channel contains the signal for the L1 the right channel the signal for the bass module The L1 signal is routed to power amps 1 and 2 the B1 signal to power amp 3 The B1 signal is also available as a balanced signal at the Bass Line Out TRS ...

Page 12: ...y in software through the digital limiter and still offers good signal to noise properties 1 2 2 Gains and Signal Levels First we need to define some reference levels for all the adjustable controls in the system For the nominal signal levels we assume certain settings in those controls and define the gain of each adjustable section Table 1 Adjustable Controls Gain range and nominal settings Next ...

Page 13: ...ed This nominal the output level of a Shure SM58 microphone that is exposed to 104 dBSPL Mic Trim 12 00 21 dBV balanced 3 dBV Balanced Mic Trim min 8 dBV balanced 10dBV balanced This nominal the output level of an AKG C4000 microphone that is exposed to 120 dBSPL Ch1 Ch2 Line out XLR 6 dBV balanced 24 dBV balanced Dig Vol Control input 0 dBV 18dBV Dig Vol Control output 10 dBV 18dBV The nominal ga...

Page 14: ...utput for e g bass players or a kick drum To this end we have provided the Bass Send output on the power stand that can be connected to the All Amps In input of a second power stand That second power stand does NOT have any line arrays con nected but can drive between 1 and 6 additional bass modules Figures 7 10 show typical configurations Figure 7 Nominal Bass Configuration 2 Bass Modules THEORY ...

Page 15: ...configuration Figure 9 External power stand total of 4 bass modules THEORY OF OPERATION Light Bass Bass Send All Amps In External Power Stand With 2 Bass Modules Bass Send All Amps In External Power Stand With 2 Bass Modules ...

Page 16: ...ing how many bass modules are connected to the second external power stand and currently there is no user interface that would allow the user to specify that in any way There fore we have chosen to implement a constant drop of 6 dB whenever something is connected to the bass send output This will work perfectly for the first 3 cases in Table 5 but lead to exces sive bass in the last 2 cases The am...

Page 17: ...e A simple way to switch between the different modes is to create a dummy cable that brings out pins 2 and 2 to a banana plug The modes can be switched by applying different numbers of 10k ohm resistors or a short between the leads of the banana plug Pins 1 and 1 of the dummy cable can still be routed to a Speakon connector to attach B1 bass modules THEORY OF OPERATION Number of Bass Modules Imped...

Page 18: ...d to power the cooling fans sheet 2 D3 which are in turn driven in proportion to the output signal level 24V is also used to provide phantom power for the micro phone inputs 5 and 3 3V outputs are used primarily to power the DSP A D D A converters microcontrollers remote control communications etc The 15V outputs power the numerous OpAmps and other analog circuitry 1 5 Audio Signal Path 1 5 1 Gene...

Page 19: ...look up table to access a subset of these steps This optimizes the feel of the control over the range of 0 to 40dB The range is restricted to prevent the user from inadvertently turning the signal path completely off 1 5 5 Channel Insert J105 and J106 input panel PCB sheet 1 B5 are stereo jacks configured with the output Send connected to the Ring terminal and the input Return connected to the tip...

Page 20: ...er to be driven separately this would gener ally only be used in special applications where a single slave PS1 is used to add bass from two different master PS1 s 1 5 10 Power Amplifiers Note Refer to the Digital Amplifier PCB schematic sheets for the following information Each of the PS1 s 3 amplifier channels is implemented with a 2 chip Class D solution from Philips The three identical channels...

Page 21: ...ital Converters Digital Both A D converters U385 U386 and the D A U387 are hardware configured U386 is config ured as a master and U385 as a slave The DSP can reset the A D through FLAG3 and the D A through FLAG2 The data is received by the DSP on SPORT1 serial port 1 channel A U385 and channel B U386 The DSP transmits the audio data again on SPORT1 serial port 1 channel A to the D A U387 and chan...

Page 22: ...d though FLAG10 1 8 Microcontroller 1 8 1 Overview The microcontroller is clocked by X341 D3 12 MHz and provides interfaces between nearly all peripherals Table 6 Peripheral pins on the microcontroller 1 8 2 Interface to Remote Relay of DSP information to the Remote The DSP in the power stand needs to transfer the clip state channel volume data cause the table for channel volume in the DSP system ...

Page 23: ... In this chapter we describe how most of the functions are implemented 1 9 1 Gain Staging Gain staging is the process of properly adjusting the gain of the system The goal is to set the gains as high as possible to optimized signal noise without overdriving or clipping any elec tronic components In contrast to home audio products musical instrument and microphones have a large variation of output ...

Page 24: ...h is a 1 kHz band pass filter telephone sound In addition to the spectral EQ there is also a noise gate available 1 9 6 Bass Line Out Detection The microcontroller polls the normalling switch on the Bass Line Out connector in regular inter vals and transfers its state to the DSP If the DSP detects a change in the state it will mute the entire power stand latch in new system EQ coefficients through...

Page 25: ... muting circuitry comprised of Q810 Q811 DZ805 R895 and C959 digital amplifier PCB sheet 3 D2 is responsible to mute any noise coming out from the output of U387 CS4392 Digital to Analog converter The principle is to detect the voltage VDDA falling below 22 volts This will cut off the DZ805 Zener diode and Q810 NPN transistor This in turn will turn on Q811 NPN transistor and pull the voltage of U8...

Page 26: ...dedicated passive unit that houses two 5 1 4 drivers The input is via two 4 pole Neutrik Speakon connectors on the rear panel Both of these inputs are paralleled allowing you to jumper multiple bass modules together There are no crossover or protection ciricuit components located on the input panel All EQ and protection is performed in the PS1 power stand Pins 1 and 1 of the input connector are us...

Page 27: ...hat the Line In 20dB gain and the Phantom Power push buttons are not pushed in 1 3 Using a balanced XLR male input cable apply a 1 kHz 30dBV signal to the channel 1 input 1 4 Reference a dB meter to the input level Measure the gain output at the Amp 1 OUT jack It should be 48 5 dB 3dB 1 5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 1 1 to 1 4 for the channel...

Page 28: ...e Line In 20dB gain and the Phantom Power push buttons are not pushed in 4 3 Using an unbalanced 1 4 phono jack input cable apply a 1 kHz 10dBV signal to the channel 1 input 4 4 Reference a dB meter to the input level Measure the gain output at the Amp 1 OUT jack It should be 28 5 dB 4dB 4 5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 4 1 to 4 4 for the chan...

Page 29: ...nce a dB meter to the input level Measure the gain output at the Bass Amp 3 OUT jack It should be 40 1dB 3dB 7 5 Repeat steps 7 1 to 7 4 for the channel 4 Line input TEST PROCEDURES 8 Channel 3 and 4 Line Input Frequency Reponse and Distortion Tests 8 1 Place a 1 4 mono shorting plug into the Amp 1 IN and Amp 2 IN jacks on the right hand side of the input output panel This will disable the channel...

Page 30: ...nal to the transducer assembly 2 4 Listen carefully for any extraneous noises such as rubbing scraping or ticking TEST PROCEDURES Note To distinguish between normal sus pension noise and rubs or ticks displace the cone slightly with your fingers If the noise stays the same it is normal suspension noise and the driver is good Suspension noise will not be heard with program mate rial 3 Transducer Ph...

Page 31: ...fingers If the noise stays the same it is normal suspension noise and the driver is good Suspension noise will not be heard with program mate rial 3 Transducer Phase Test 3 1 Momentarily apply a DC voltage of 10V positive applied to the positive terminal of the test cable and GND connected to the GND terminal The bass module test cable is described in the appendix of this trouble shooting guide 3 ...

Page 32: ...e S PDIF cable to the Audio Outputs Digital jack on the back of the CD player Connect the other end of the S PDIF cable to the DATA IN jack on the PS1 Power Stand s input panel This jack is located in the middle of the panel It s an RCA jack with a white center Connect the PS1 Power Stand s AC line cord to AC mains Turn on the PS1 Wait for the power LED to light steady green Turn on the CD player ...

Page 33: ...sed with the Bass Amp3 OUT jack The load on this jack automatically sensed in order to properly tailor the EQ and output level for the connection of one or two bass modules It does this by sensing the resistive value across terminals 2 and 2 The bass modules have a 10k ohm resistor across these terminals When only one bass module is connected the PS1 sees the 10k resistance and sets the EQ and out...

Page 34: ...nel 1 and 2 insert jacks on the PS1 Power Stand When you plug it into the channel 1 or channel 2 insert jack you will be able to separate the sections of the electronics Refer to the PS1 Power Stand block diagram on page 3 The RETURN dual banana jack will give you the output of the circuitry up to the output of the 2 channel digital volume control The SEND dual banana jack will allow you to input ...

Page 35: ...ector Molex part number 39 01 2041 4 Molex crimp on pins for above connector Molex part number 39 00 0041 M 1 dual banana jack 12 feet of 16 or 18AWG twisted pair wire Cut the 12 foot length of twisted pair wire in half Strip all of the wires back about 1 4 inch Crimp the molex pins onto the wires The positive side of the twisted pair wires will go into pins 2 and 4 of the Molex connector The nega...

Page 36: ...ions A17 A7 Row Address Inputs To provide memory addresses Row addresses define a page for a Write cycle A6 A0 Column Address Inputs Column Addresses are toggled to load page data DQ7 DQ0 Data Input output To output data during Read cycles and receive input data during Write cycles Data is internally latched during a Write cycle The outputs are in tri state when OE or CE is high CE Chip Enable To ...

Page 37: ... B2 B1 B0 OE VCC PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 1 DIR Direction 2 3 4 5 6 7 8 9 A0 to A7 Data inputs outputs 10 GND Ground 0 V 18 17 16 15 14 13 12 11 B0 to B7 Data inputs outputs 19 OE Output enable input active LOW 20 VCC Positive supply voltage 74LV245 Octal Bus Transciever PIN DESCRIPTION PIN NUMBER SYMBOL NAME AND FUNCTION 1 4 9 12 1A 4A Data inputs 2 5 10 13 1B 4B Data inputs 3 6...

Page 38: ... 48 MULTIPROCESSOR INTERFACE DUAL PORTED SRAM EXTERNAL PORT DATA BUS MUX 32 24 24 PM ADDRESS BUS DM ADDRESS BUS PM DATA BUS DM DATA BUS BUS CONNECT PX DATA REGISTER FILE 16 40 BIT BARREL SHIFTER ALU MULTIPLIER 32 48 40 CORE PROCESSOR DMA CONTROLLER PROGRAM SEQUENCER DAG2 8 4 24 SDRAM INTERFACE I 2 S 2 Rx 2Tx 2 Rx 2Tx I 2 S SPORT 0 DAG1 8 4 32 DATA DATA DATA ADDR ADDR ADDR Functional Block Diagram ...

Page 39: ...er Pin Assignments for SOIC and DIP Top View CD4093BC Quad Nand Gate C E B 2 3 1 5 4 6 nc C A CNY17G 2 Optocoupler CS4392 KZ Digital to Analog Converter DAC A1 A2 A3 6k 6k Sense 8 9 10 14 11 6 4 3 12 5 6k 6k VIN Ð VIN RG 1 VO2 VO1 V VÐ INA163 G 1 6000 RG 3k 3k VO Ref VO2 NC GS2 V Ref VO Sense VO1 NC GS1 VIN VIN V NC SO 14 NC No Internal Connection 14 13 12 11 10 9 8 1 2 3 4 5 6 7 INA163 Low Noise ...

Page 40: ...NVERSION 8 7 GND VEE 16 VCC 13 14 15 12 1 5 2 4 A7 A6 A5 A4 A3 A2 A1 A0 CHANNEL IN OUT TG TRUTH TABLE INPUT STATES ÒONÓ CHANNELS ENABLE S2 S1 S0 L L L L A0 L L L H A1 L L H L A2 L L H H A3 L H L L A4 L H L H A5 L H H L A6 L H H H A7 H X X X None X Don t Care TOP VIEW 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 A4 A6 A A7 A5 E GND VEE VCC A1 A0 A3 S0 S1 S2 A2 CHANNEL IN OUT CHANNEL IN OUT CHANNEL IN OUT...

Page 41: ...le by software Port 1 pin can also by used as alternative function T0 T1CK T1 BUZ RxD TxD D 37 32 T0 T1CK T1 BUZ RxD TxD P2 0 P2 7 I O Bit programmable I O port for Schmitt trigger input or push pull output Pull up resistors are assignable by software Port 2 pins can also be used as external interrupt D 13 20 INT0 INT7 P3 0 P3 7 I O Bit programmable I O port for Schmitt trigger input or push pull ...

Page 42: ...9459F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 VSS L OUT NC L IN L LD1 L LD2 L A GND NC CS1 NC GND CK VDD R OUT NC R IN R LD1 R LD2 R A GND NC CS2 NC STB DATA L ch R ch TC9459F Volume Control IC ...

Page 43: ...DIX TO 92 TO 226 Pin 1 Reference 2 Anode 3 Cathode 1 2 3 TL431CLP TO 92 BLOCK DIAGRAM Note 1 Toggle flip flop used only in 1844 and 1845 UC2842 PWM Controller Pinout Diagram UC2842 PWM Controller Block Diagram ...

Page 44: ...44 APPENDIX CS5361 AD Converter Pinout and Table ...

Page 45: ...45 APPENDIX CS8406 Digital Audio Interface Transmitter ...

Page 46: ...46 APPENDIX CS8416 Digital Audio Interface Receiver ...

Page 47: ...47 APPENDIX TDA8929T Digital Amplifier Controller ...

Page 48: ...48 APPENDIX TDA8927J Digital Power Amplifier ...

Page 49: ... 2004 Bose Corporation Reference Number 264018 TG Rev 00 Troubleshooting Guide Personalized Amplification SystemTM Troubleshooting Guide ...

Page 50: ...SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE Bose Corporation The Mountain Framingham Massachusetts USA 01701 P N 264018 TG Rev 00 10 2004 P http serviceops bose com ...

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