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Audioaccess PX-600 Service Manual Addendum

Multi-room pream/controller
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AUDIOACCESS
PX-600
MULTI-ROOM PREAM/CONTROLLER
PRELIMINARY SERVICE MANUAL
Harman Consumer Group
250 Crossways Park Dr.
Woodbury, New York 11797

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  • Page 1 AUDIOACCESS PX-600 MULTI-ROOM PREAM/CONTROLLER PRELIMINARY SERVICE MANUAL Harman Consumer Group 250 Crossways Park Dr. Woodbury, New York 11797...
  • Page 2 The PX-600 can also be operated from its own optional handheld IR remote control from any zone. Of course, the main zone can always be operated from the PX-600's front panel. Learning to operate the system is simplicity itself.
  • Page 3 Specifications PX-600 Multi-Room Controller Audio Section Inputs: • Five stereo source inputs, 1 mono page input, each with loopthru capability • Input impedance: 10k ohms • Maximum input voltage: 3.5 Vrms Outputs: • Six stereo preamp outputs with independent volume, bass and treble •...
  • Page 4 Specifications Preamp Outputs Zone Outputs Frequency Response 10-84kHz, +0, -1 10-95kHz, +0, -1 S/N (ref: 1kHz, 1 Vrms, Filter > 99 dBV > dBV at 22kHz, Volume at unity gain THD+Noise (@ 1kHz, Filter <0.008% (500mV <0.004% (1Vinput at 80kHz, Volume set at input signal) signal) unity gain...
  • Page 11 Field Repair Field Repair...
  • Page 12 LOCK UPS or SLOW OPERATION LOCK UPS or SLOW OPERATION Incorrect Wiring IR Interference Keypad Termination Switch...

  • Page 13: Keypad Installation

    KEYPAD INSTALLATION KEYPAD INSTALLATION Make Tight Connections Insure Power, Ground, and Data wires are in Correct Order Provide Strain Relief On KPT Keep On hand Extra KPT Blocks Do Not “Insert” Insulation Into Connector Install Keypad with Termination Switch in “UP” Position (off)
  • Page 14 KEYPAD REPAIRS KEYPAD REPAIRS Replace RS 485 Driver Replace Keypad Processor Board...
  • Page 16 Replacing Processor Board Replacing Processor Board...
  • Page 17 Audioaccess MCI Audioaccess MCI MCI Multi-room Computer Interface RS-232 to RS-485 Translator...

  • Page 18: Field Repairs

    600 Field Repairs 600 Field Repairs Unit Contains 3 Sections – Audio Preamplifiers – CPU – Power Supply Field Repairs May be Performed to Power Supply and CPU...
  • Page 19 • Audio Signal • • Power • Audio Signal • • Power Path Supply Path Supply...
  • Page 20 Audio Signal Power Audio Signal Power Path Supply Path Supply...

  • Page 21: Control Section

    Power Supply Control Section Control Section Power Supply Main Power Fuse Main Power Fuse Keypad Fuse Keypad Fuse...

  • Page 22: Internal Fuse

    Internal Fuse Internal Fuse...
  • Page 23 POWER SUPPLY FIXES POWER SUPPLY FIXES NO POWER – Replace Mains Fuse - 5 X 20 mm 2A Slow Blow – Replace Internal Fuse - F1301 - 5 X 20 mm 500 ma Slow Blow...
  • Page 24 Main Power Issues Main Power Issues Check Power Load on Convenience Outlet – Do not power amps directly with PX-600 – Do not Exceed 200 Watts on PX-600 outlet AC Line condition +- 10% rated Voltage Use Un-switched Outlets for ALL...
  • Page 25 Unit Hard Power Up Unit Hard Power Up AUDIOACCESS PX-600 VERSION 2.04 -ANY- KEY-TO-EXIT- • “ALL OFF ” LED on PX 600 Cycling On and Off...
  • Page 26 Replacing RS 485 Driver Replacing RS 485 Driver RS485...
  • Page 27 TVS Bus Protectors TVS Bus Protectors 485 Driver 485 Driver...

  • Page 28: Audio Signal Path

    600 Internal Sections 600 Internal Sections Microprocessor Audio Signal Power Audio Signal Power Path Supply Path Supply...
  • Page 29 UNIT CYCLES ON AND OFF UNIT CYCLES ON AND OFF REPLACE RS-485 Driver Replace Microprocessor...
  • Page 30 Microprocessor SRAM EPROM...
  • Page 31 485 or SRAM Problems 485 or SRAM Problems AUDIOACCESS PX-600 SOURCE EQUIPMENT VERSION 2.04 NOW LOADING………. -ANY- KEY-TO-EXIT-...
  • Page 32 Control Problem Descriptions Control Problem Descriptions Keypads Initialize but appear “dead” Intermittent Control or “Lock UP” No IR Output...
  • Page 33 Control Repairs Control Repairs Disconnect Keypad Bus and Check Unit From Front Panel Check Keypad Fuse Data Reset Replace RS 485 Replace SRAM Replace EPROM Replace Microprocessor...
  • Page 37 PX-600 SCHEMATICS CONTENTS MAIN BOARD REV B0 MAIN BOARD REV B1 MAIN BOARD REV C0 MAIN BOARD REV C1 MAIN BOARD REV D0 MAIN BOARD REV D1 MAIN BOARD REV D2 FRONT PANEL REV C0 PROGRAMMER REV B0...
  • Page 243 PX-600 Field Repair Guide Version xxxx Rev Level xxx...

  • Page 244: Initial System Power -U P

    PX-600 F IELD EPAIR HART NITIAL YSTEM OWER PX-600FRK Power Up Flow Page 1 of 1...
  • Page 245 PX-600 F IELD EPAIR HART KPS B PERATIONS PX-600FRK KPS Bus Flow Page 1 of 1...
  • Page 246 PX-600 FIELD REPAIR TROUBLE SHOOTING OCTOBER 8, 2003 # XXXXXX] PX-600 REPAIR PARTS LOCATIONS Power Fuse RS485 Driver F1301 U1106 Microprocessor U801 SRAM U804 EPROM U803 Front of PX-600 PX-600 Field Repair Trouble Shooting.doc Page 4...
  • Page 247 Audioaccess warranty. 6. Volume Control Assembly – This volume control pot on the PX-600 and MRX controls the volume of Zone 6 in these systems. A broken volume assembly will cause the system to “lock up” when zone 6 is “turned on”...
  • Page 248 MRX-NT - The ALL output of the MRX-NT is factory set for using high power blaster emitters. Functionally, the IR output is identical to that of the PX-600. To modify this to a standard low power emitter port you must modify the emitter being used.

  • Page 249: Learning Ir. Codes

    The IR bursts on Parasound remotes are short quick bursts. If the button on the Parasound remote is held too long the px-600 programmer will lock up. To avoid this from happening the button on the remote must be pressed and released quickly and then the volume up button press to fill up the IR.
  • Page 250 Voltage Change for PX-600 Directions to change from 120VAC to 230VAC version. Locate the terminations for the power transformer to main PCB. Looking from the back of the unit they are directly above of the AC power connection and main switch.
  • Page 251 CAUTION - Be sure to ground yourself before performing this procedure!! This is a static sensitive device. To change the EPROM in a PX-600 - Make sure to follow the ESD Warning on the page 1, provided. Take off the top cover and look for U803 on the main circuit board.
  • Page 252 BQ 4011. 4. With the FRONT of the PX-600 towards you, Carefully place the new SRAM into the socket with the dimple on top of the IC in the upper right hand corner and give a slight push down to ensure the SRAM is properly seated in the socket.
  • Page 253 HEET ECHNICAL ERVICES DECEMBER 8, 1999 Page 2 of 2 SRAM L OCATION The SRAM can be found at location U304. Please see diagram below showing location on the PCB. SRAM EPROM Front of PX-600 PX-600 SRAM Replacement.doc Page 2...

  • Page 254: Component Layout

    PX-600 COMPONENT LAYOUT MICROPROCESSOR 485 DRIVER U801 U1106 FUSE F1301 SRAM U804 EPROM U803...

  • Page 255: Rear Panel Layout

    PX-600 F IELD EPAIR ANEL AYOUT AC MAINS FUSE KPS / 485 BUS CONNECTOR KPS / BUS FUSE PX-600FRK Rear Layout Page 1 of 1...

  • Page 256: Internal Component Layout

    PX-600 F IELD EPAIR NTERNAL OMPONENT AYOUT 485 DRIVER U1106 MICROPROCESSOR U801 FUSE F1301 SRAM U804 EPROM U803 PX-600FRK Internal Layout Page 1 of 1...
  • Page 257 OVERVIEW There are two possibilities for programming the DSS in a PX-600 system, using your choice of source inputs. Each method has its pros and cons, but one of them should work for your particular client’s needs. Follow the examples below to program a DSS to suit the customers needs.
  • Page 258 The advantage to this method is the ability to program as many stations as are available on the Custom Guide. LOW CAP CD, AUX, TAPE, or VIDEO can be used on the PX-600 to control the DSS. We’ve included samples from TAPE or CD under AUX programming..
  • Page 259 SKIP TRACK command. Briefly tap SKIP TRACK on the CD’s remote and immediately press and hold another button on the remote until the PX-600 indicates “Storage Successful” on the display. The PLAY button works well for this unless the player has a combination PLAY/PAUSE button. If this is...
  • Page 260 (CD, Tape, etc.) to start it playing. When using this type of remote to program IR commands into the PX-600, the PLAY command often gets cut off and is not stored properly.
  • Page 261 You may opt to eliminate the STOP command altogether. If you plug the LD player into the PX-600 for AC power, it may power up into a “standby” mode. Before it accepts any other commands, the player needs the IR POWER command. Use the POWER command from either the CD or the VIDEO input - not both.
  • Page 262 Audioaccess warranty. 6. Volume Control Assembly – This volume control pot on the PX-600 and MRX controls the volume of Zone 6 in these systems. A broken volume assembly will cause the system to “ lock up” when zone 6 is “ turned on”...

  • Page 263: Px-600/Kps Parts

    The PX-600 Field Repair Kit contains components that can be changed in the field to repair the PX-600 system. By following the below flow charts a PX-600 can be diagnosed and repaired at the job site. This will eliminate the need to remove the unit and have the customer down while the unit is being repaired.

  • Page 264: Troubleshooting

    Variable audio comes out of the preamp section and Check PX-600 back panel outputs NOT the zone outputs. All zone outputs become HOT when any zone is active. No Audio in one zone Identify Zone Turn all zones off but the problem zone.
  • Page 265 9 in the UP position. If it is coming in through front panel of the system? the front panel – PX-600 use a pigtailed 1/8” mono jack and plug it into the IR input on the back panel. MRX use a piece of Black tape to cover the IR receiver.
  • Page 266 Check for Proper tuner set up. Front Panel “talk back” Is there an extra ordinary amount of Front panels – PX-600 use a pigtailed 1/8” mono jack LED lit or blinking – no light shining on the front panel? and plug it into the IR input on the back panel. MRX intentional input.
  • Page 267 Perform DATA reset to system. IR emitter blows Check to make sure the emitter is If using the ALL output on PX-600 then remove cover plugged into an emitter port and not and set jumper to emitter @ location P120. If using the All or Blaster port.
  • Page 268 Check Data bus connection. Connect with correct polarity while not connecting the system do not respond to RED (or power) wire. any commands other than front panel. Make sure keypads are correctly connected for PX-600 Field Repair Guide Page 8...
  • Page 269 Check data bus voltage at head unit. The RED indicator LED should be lit if there is power at the MCI. Voltage between pins 1 & 4 should read between 8 to 13VDC. PX-600 Field Repair Guide Page 9...
  • Page 270 9 and then end with 0, which will be the 10th preset. 10. Follow the example below FIGURE # 1 FIGURE # 1 SAMPLE PROGRAMMING TABLE FOR scientific Atlanta DMX MRX / PX-600 DISPLAY DMX IR REMOTE BUTTON INPUT IR FOR AUX POWER POWER INPUT IR FOR AUX PLAY...
  • Page 277 ECN2986- 10/1/2001 1 11/ 6/97 688-2500-000 WIR CORDSET 8' IEC USA PACIFIC ELECTICORD- C-3120-008BL 10/ 1/01 760-4600-005-G METAL PX-600 TOP COVER REV G AS PER DWG# 760-4600-005-G ECN2986- 10/1/2001 11/10/97 667-1000-006 CONN TERM SCREW 4POS PLUGABLE PHOENIX# 1754481 DIGIKEY# 272-1002-NDL...
  • Page 278 1 ROLL IS EQUAL TO 36 YDS (1296.00") 18 ROLLS TO A CASE. MIN FROM 3M IS 18RLS 5/ 7/99 610-1204-000 ICS DIG PROG EPROM PX-600 V2.04 10/10/97 610-2712-000 ICS DIG PROG EPROM 27C512-200 UNPRG'D TEXAS INSTRUMENT TMS27C512-20JL OR EQUIV...

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