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Tascam DM-24 Service Manual
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Tascam DM-24 Service Manual

Digital mixing console
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See also: Feature Manual , Owner's Manual
CONTENTS
4. DOWNLOADING & BACKING-UP THE SRAM DATA 21
BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-CUR-
RENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.
Effective : July, 2002
SERVICE MANUAL
D D M M - - 2 2 4 4
Digital Mixing Console
2
7
20
23
29
38
57
65
90
INSTRUCTIONS FOR SERVICE PERSONNEL
S-0065

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Summary of Contents for Tascam DM-24

  • Page 1 SERVICE MANUAL D D M M - - 2 2 4 4 Digital Mixing Console CONTENTS 1. SPECIFICATIONS 2. SELF DIAGNOSTIC FUNCTION 3. HOW TO CHECK THE MAIN PCB VERSION 4. DOWNLOADING & BACKING-UP THE SRAM DATA 21 5. UPDATING THE PROGRAM 6.

  • Page 2: Specifications

    TASCAM DM-24 1. SPECIFICATIONS <Analog audio I/O> All specifications are given with the factory referencelevel of –16dBFS. MIC inputs (channels 1 through 16) Balanced XLR-type female connectors (1=ground, 2=hot, 3=cold) Adjustable input level: –56dBu (TRIM max) to –2dBu (TRIM min)) Input impedance: 2.2kΩ...
  • Page 3 TASCAM DM-24 MONITOR OUTPUTS (CR (BAL)) Balanced 1/4” jacks Nominal output level: +4dBu (CR VR max.) Maximum output level: +20dBu (CR VR max.) Output impedance: 100Ω MONITOR OUTPUTS (STUDIO) RCA pin jacks Nominal output level –10dBV Maximum output level: +6dBV Output impedance: 100Ω...
  • Page 4 TASCAM DM-24 MIDI IN, OUT, THRU/MTC OUT 3 x 5-pin DIN connectors—conform to MIDI specifica- tions TIME CODE IN RCA pin jack Conforms to SMPTE specifications DTRS REMOTE OUT 15-pin D-sub male (metric lock screws) Conforms to DTRS SYNC standard EXT SW 1/4”...

  • Page 5: System Performance

    TASCAM DM-24 <System performance> THD (nominal level) 20Hz – 20kHz LINE IN to INSERT SEND: < 0.1% 1kHz LINE IN to STEREO OUTPUT: < 0.013% Frequency response (nominal level) MIC/LINE IN to INSERT SEND: 20Hz – 25kHz +0.5dB/– 1.5dB LINE IN to STEREO OUTPUT: 20Hz –...
  • Page 6 TASCAM DM-24 Dimensional Drawings 582 mm (22.9 in) TASCAM...

  • Page 7: Self Diagnostic Function

    JOG/DATA dial. When you press the ENTER key, the unit switches into the selected test mode. In addition, upon launch of DIAG, the DM-24 checks the volt- age of the battery for SRAM and displays a pop-up warning message if the voltage lies in the range of error (below 2.5 V or...
  • Page 8 TASCAM DM-24 LED TEST This test checks if each of the LEDs illuminates. 1. When the DM-24 switches into the LED TEST mode, a pop- up message, as shown below, appears and all the LEDs should illuminate. They illuminate at the same time if the meter bridge (MU- 24) is connected.
  • Page 9 SW TEST This test checks if each of the switches toggles on/off properly. When you run this test, the DM-24 is automatically set to CH-16 for LAYER STATUS. 1. When the DM-24 switches into the SW TEST mode, the fol- lowing screen will appear.
  • Page 10 TASCAM DM-24 FADER/SOLO VR READ TEST This test checks if the reading provided by each fader is correct. The DM-24 is automatically set to CH-16 for LAYER STA- TUS. 1. When the DM-24 swiches into the FADER/SOLO VR READ TEST mode, the screen should look like this.
  • Page 11 The on-screen image of the fader knob you touch goes black. 3. If the fader you touched is recognized by the DM-24, go on to the next fader. The on-screen image of the fader having been checked goes out.
  • Page 12 This test checks if the fader motors work properly either one by one or all at a time. 1. When the DM-24 switches into the FADER MOTOR TEST mode, the following pop-up message will appear and the Multiple Fader Moter TEST will start.
  • Page 13 This test checks if each POD recognizes the rotational direction when rotated. 1. When the DM-24 switches into the POD & DIAL TEST mode, the following screen appears. 2. A POD to be rotated is indicated by a bliking frame. Rotate that POD.
  • Page 14 TASCAM DM-24 LCD TEST This test checks each of the LCD screens for irregularity. 1. When the DM-24 switches into the LCD TEST mode, the screen sequences through All Turned Off (about 1 second) Turned On (about 1 second) DIAG menu (about 1 second).
  • Page 15 TASCAM DM-24 4. When the test was successful, the next pop-up message appears. This pop-up message automatically goes out and brings you back to the COMMUNICATION TEST screen with a check mark placed in the corresponding check box. 5. When a time-out occurs, the next pop-up message will appear.
  • Page 16 GPI TEST This test check if the GPI pulse signal is sent out correctly. 1. When the DM-24 switches into the GPI TEST mode, the follow- ing pop-up message will appear. 2. Upon pressing ENTER, the GPI pulse signal is sent out and the next pop-up message will appear.
  • Page 17 When you do this, it is absolutely necessary to run the SRAM INIT procedure before shipment. (Refer to the next item.) 1. When the DM-24 switches into the SRAM INIT for Factory TEST, the next pop-up message will appear. 2. Press ENTER and the SRAM is initialized to values for use on a production line.
  • Page 18 This proceudre dumps the content of the SRAM in the SMF (Standard Midi File) format. (Refer to page 21.) 1. When the DM-24 switches into the SRAM DUMP mode, the following message will appear. 2. Upon pressing ENTER, the dump process starts.
  • Page 19 AND NEVER RUN THIS PROCEDURE EXCEPT IN THE CASE WHERE THE FLASH ROM IS REPLACED. 1. When the DM-24 switches into the FLASH INROMATION CLEAR mode, the following pop-up message will appear. 2. Press ENTER and the area of the SRAM where the number...

  • Page 20: How To Check The Main Pcb Version

    TASCAM DM-24 3. HOW TO CHECK THE MAIN PCB VERSION 1. Switch on power to the DM-24. 2. Press SHIFT + REPEAT + RHSL as many times as neces- sary to get to the following screen. "XX" in "Main PCB version XX" in the forth line is the MAIN PCB version number.

  • Page 21: Downloading & Backing-Up The Sram Data

    1. Connect MIDI IN on the sequencer to MIDI OUT on the DA-24 via a MIDI cable. 2. Place the MIDI sequencer in the record mode. 3. Place the DM-24 in the Self Diagnostics mode. 4. Run "SRAM DUMP [MIDI]" in the DIAG menu. (Refer to «...
  • Page 22 MIDI file containing the SRAM data. 4. When playing the SRAM data, the next pop-up message will appear. 5. Upon completion of the load, the next pop-up message will appear. When it does, turn the DM-24 off then back on to complete the procedure.

  • Page 23: Updating The Program

    If necessary, follow the instruc- tions for a specific version. [Procedure for Program Update] 1. Connect MIDI IN on the DM-24 to MIDI OUT on the MIDI Data Filer. 2. Get to the BULK sub-screen under the MIDI/MC screen, move the cursor to the [READY] button, then press ENTER.
  • Page 24 TASCAM DM-24 4. The screen changes to show the following pop-up stating: "Software Data Download Ready...". 5. Upon appearance of the above pop-up, play the MIDI Data Filer having a .mid file you need to dump before any other one.
  • Page 25 Nothing is written on the ROM until you press ENTER in step 7, so if you made a mistake in selecting a .mid file before you reach step 7, you can abort the procedure and redo from the beginning after turning the DM-24 off then back on.
  • Page 26 ROM WRITER to run the Program Update. b) Install the ROMs removed in step a) and switch on power to the DM-24. Powered up, it shows the screen you were at in step 4. c) For the flash.mid file, repeat steps 5-8 corrrectly.
  • Page 27 TASCAM DM-24 [Procedures for Checking the Version Number and Initializing the SRAM] Upon completion of the Program Update, check the Version Number and initialize the SRAM, as follows. 1. Get to the PREFERENCES sub-screen under the OPTION screen, move the curosr to the [Version Info.] button, and press ENTER.
  • Page 28 TASCAM DM-24 4. Move the cursor to the SRAM INIT option and press ENTER to run SRAM INIT. 5. Move the cursor to the EXIT option and press ENTER to leave the DIAGNOSTICS screen.

  • Page 29: Error Messages

    TASCAM DM-24 6. ERROR MESSAGES OS ERROR [***-*****XXX-**]...
  • Page 30 TASCAM DM-24 CPU ERROR [00-00000XXX-**]...
  • Page 31 TASCAM DM-24 PANEL ERROR [PP-XXXXXXXX-YY] PANEL ERROR [PP-********-YY] PANEL ERROR [PP-*****XXX-99]...
  • Page 32 TASCAM DM-24 PANEL ERROR [PP-XX******-00]...
  • Page 33 TASCAM DM-24 PANEL ERROR [PP-XX******-00] – –...
  • Page 34 Other Error Messages Meaning: An illegal interruption signal is sent to the Panel CPU. Remedy: Restart the DM-24. If this does not fix the problem, write down all error messages and check with the Tokyo Service. Meaning: The Panel CPU runs wild.
  • Page 35 Meaning: The voltage drops on the +5V line or it has ever dropped. Remedy: Restart the DM-24. If this does not fix the problem, check if the power supply provides the prescribed voltage. If it does, chances are the AC voltage momentarily dropped. It is U3 on the MAIN PCB that controls the +5V line and, when something goes wrong on this line, check pin 8 of U3, R3, R52 and pin 76 of U33 which generate an interruption to pin 76 of the CPU (U33) for signs of bad soldering.
  • Page 36 Remedy: Get to the PREFERENCES sub-screen under the OPTION screen, and check if the Battery Check reads OK. If the message "Can't Save DM-24 System Date" is blinking, replace the battery. Meaning: Aberrant data is detected in the audio signal in the DSP.
  • Page 37 Remedy: Make U31 (Panel) on the MAIN PCB consistent with U6 and U7 (Main) on the MAIN PCB in point of version. If their versions are originally met, restart the DM-24. If many times of restart do not fix the problem, try redoing the program update.

  • Page 38: Block Diagrams

    TASCAM DM-24 7. BLOCK DIAGRAMS...
  • Page 39 TASCAM DM-24...
  • Page 40 TASCAM DM-24 MAIN PCB CPU BLOCK DIAGRAM (part 1)
  • Page 41 TASCAM DM-24 MAIN PCB CPU BLOCK DIAGRAM (part 2) MOTHER PCB CARD1 MPG0 MPG1 MPG2 MPG3 DSP1 (U77) MPG4 IRQ0 MAIN CPU (U11) FLAG0 CARD2 RESET 28.224MHz SRAM(U8) DSP2 (U78) IRQ7 IRQ3 IRQ1 IRQ0 IRQ0 IRQ TIOC2B FLAG0 IRQ TIOC1B...
  • Page 42 TASCAM DM-24 MAIN PCB CLOCK CIRCUIT BLOCK DIAGRAM (MAIN PCB CIRCUIT DIAGRAM page 11) U125 XC9536XL (PLD for CLK) U147 (page 4) WORD IN (P18-16pin) COUNTER COUNTER SLOT-1 LRCK (P22-11pin) U11-104pin (page 1) 1/512 (page 3) SLOT-2 LRCK (P22-12pin) ADAT IN LRCK (U120-8pin) D.IN 1 LRCK (U143-17pin)
  • Page 43 TASCAM DM-24 MAIN PCB IOX BLOCK DIAGRAM MOTHER PCB PAGE 3 IN 1 PAGE 4 IN 2 Contents of the circuit schema IN 3 74HC540 (U58) IN 4 TDIF 1 IN 1 IN 5 PAGE 1 MAIN CPU PAGE DSP5, DSP6 & SDRAMs...
  • Page 44 TASCAM DM-24 MAIN PCB DSP BLOCK DIAGRAM...
  • Page 45 TASCAM DM-24 MAIN PCB DSP Architecture 1/6 (Overview) U71-73 MTR1 MTR2 HOST IOX *3 MTR3 SRAM 32K * 16 U13,14 AK4527 AK4527 SDRAM CS8420 DR1A CS842 DT1A DR1B DT1B AK5383 U96,97 CS8420 256K * 2 * 32 DSP#3 DR0A DT0A...
  • Page 46 TASCAM DM-24 MAIN PCB DSP Architecture 2/6 (DSP #1 & 2) U82-83 ADDRESS0-14 PCS1* SRAM PCS2 U84-85 DATA0-23 DATA0-15 U74-76 INT_DSP(#1) INT_DSP(#2) U128 R213 CALL DSP#1 LRCK CALL DSP#2 DSP_MUTE IRQ0 IRQ0 Performance check Performance check IRQ1 IRQ1 FLAG3 IRQ2...
  • Page 47 TASCAM DM-24 MAIN PCB DSP Architecture 3/6 (DSP #3 & 4) TFS0 R123 R152 RFS0 RFS0 TFS0 TCLK R127 R153 TCLK RCLK0 RCLK0 R128 CH1-8/17-24 Post GATE CH1-8/17-25 Pre FADER R156 DT0A DT0A DR0A DR0A R131 R157 MON1-8 , RTN , Digital IN...
  • Page 48 TASCAM DM-24 MAIN PCB DSP Architecture 4/6 (DSP #5 & 6) U99-100 ADDRESS0-9 ADDRESS0-14 ADDRESS13 U103 SRAM SDRAM U103 U101-102 DATA0-15 DATA0-31 INT_DSP(#5) INT_DSP(#6) U128 R217 CALL DSP#5 LRCK CALL DSP#6 DSP_MUTE IRQ0 IRQ0 Performance check IRQ1 Performance check IRQ1...
  • Page 49 TASCAM DM-24 MAIN PCB DSP Architecture 5/6 (DSP #7) U109 U110 U111 U112 U108 ADDRESS0-14 ADDRESS0-7 U107 DATA0-15 DATA0-23 SRAM SRAM SRAM SRAM U128 R218 LRCK IRQ0 Performance check IRQ1 DSP_MUTE IRQ2 FLAG3 FLAG1 U105 DSP #7 U106 Effect patching...
  • Page 50 TASCAM DM-24 MAIN PCB DSP Architecture 6/6 (DSP #9 IF-CS/DM) IF-CS/DM MAIN PCB INT_DSP(#9) FLAG0 FLAG1 LRCK ADDRESS0-7 IRQ2 Performance check DATA0-7 MAIN PCB FLAG5 FLAG6 FLAG3 DSP #9 FLAG CALL DSP #9 IRQ0 MASTER FADER MASTER COMP CASCADE U106...
  • Page 51 TASCAM DM-24 MASTER SECTION MAIN PCB MASTER PCB AK4527 U158 STEREO P106 J103 U503B STEREO L DAC1 9-10DO INST L STEREO R DAC2 11-12DO U504 J104 OUT L AK4527 U157 P101 CROOM L 5-6DO DAC1 CROOM PCB U503A J203 CROOM R...
  • Page 52 TASCAM DM-24 MTR IN/OUT SECTION (TDIF/ADAT/SLOT) [ INPUT ] [ OUTPUT ] TDIF PCB TDIF PCB TDIF-1 P601 TDIF-1 P601 P611 P611 1-8DI 1-8DO P602 P602 9-16DO 9-16DI P603 P603 P612 P612 1-8DO 1-8DI U120 U121 P614 P614 U602 U601...
  • Page 53 TASCAM DM-24 MIC SECTION MAIN PCB MIC AMP PCB INPUT JACK PCB PHANTOM P101 U148 M/L 1( H,C,G) 1-2DI AK5383 TRIM LINE INST U149 M/L 2( H,C,G) AK5383 3-4DI U150 M/L 3( H,C,G) AK5383 5-6DI M/L 4(H,C,G) U151 M/L 5( H,C,G)
  • Page 54 TASCAM DM-24 ASSIGNABLE SEND/RETURN & DIGITAL IN/OUT SECTION U156 MASTER PCB P105 AK4527 P106 J101 J102 13-14DI 13-14DO DAC3 U501 J201 J202 J301 J302 U502 J401 DAC3 15-16DO 15-16DI J402 U157 AK4527 ASSINABLE RETURNS ASSINABLE SENDS DIO PCB U138 CS8420...
  • Page 55 TASCAM DM-24 POWER SUPPLY SECTION P102 To PCBA,MOTHER 91251456-00 POWER SW PCB To PCBA,MOTHER CN10 SW POWER UNIT P101 POWER To PCBA,MAIN CN11 mounted: DM T/C To PCBA,FADER CN12 SW101 JP5 NO mounted: EUR To PCBA,LCD SUB&PANEL&TDIF CN13 P103 EUR (230V)
  • Page 56 TASCAM DM-24 PARTS LIST SECTION NOTES º º PC boards shown are viewed from parts side. º Parts marked with require longer delivery time. º º The parts with no reference number or no parts number in the º exploded views are not supplied.

  • Page 57: Exploded Views And Parts List

    TASCAM DM-24 8. EXPLODED VIEWS AND PARTS LIST EXPLODED VIEW-1 To Side Panel, L To Rear Panel To Side Panel, R &...
  • Page 58 TASCAM DM-24 EXPLODED VIEW-1...
  • Page 59 TASCAM DM-24 EXPLODED VIEW-1...
  • Page 60 TASCAM DM-24 EXPLODED VIEW-2 & To Top Panel To Top Panel...
  • Page 61 TASCAM DM-24 EXPLODED VIEW-2 £...
  • Page 62 TASCAM DM-24 EXPLODED VIEW-2...
  • Page 63 TASCAM MU-24 EXPLODED VIEW-3 (MU-24)
  • Page 64 TASCAM MU-24 EXPLODED VIEW-3 (MU-24) INCLUDED ACCESSORIES (MU-24)

  • Page 65: Pc Boards And Parts List

    TASCAM DM-24 9. PC BOARDS AND PARTS LIST GATHER PCB ASSY, MAIN GATHER PCB ASSY, MAIN...
  • Page 66 TASCAM DM-24 GATHER PCB ASSY, MAIN GATHER PCB ASSY, INPUT...
  • Page 67 TASCAM DM-24 GATHER PCB ASSY, INPUT GATHER PCB ASSY, FADER £ £ £ £ £ £ £ £ GATHER PCB ASSY, FADER...
  • Page 68 TASCAM DM-24 GATHER PCB ASSY, PANEL GATHER PCB ASSY, PANEL GATHER PCB ASSY, MASTER...
  • Page 69 TASCAM DM-24 GATHER PCB ASSY, MASTER GATHER PCB ASSY, TRANSPORT £ £ £ £...
  • Page 70 TASCAM DM-24 GATHER PCB ASSY, TRANSPORT GATHER PCB ASSY, POWER £ £ £ £ £ £ £ GATHER PCB ASSY, MOTHER £ £ GATHER PCB ASSY, POWER £ £ £ £ £ £ £ £ £ £ £ £ £...
  • Page 71 TASCAM MU-24 GATHER PCB ASSY,METER BRIDGE (OPTION) GATHER PCB ASSY,METER DRIVER (OPTION)
  • Page 72 TASCAM IF-TD/DM, IF-AE/DM IF-TD/DM (OPTION) IF-AE/DM (OPTION)
  • Page 73 TASCAM IF-AD/DM, IF-CS/DM IF-AD/DM (OPTION) IF-CS/DM (OPTION)
  • Page 74 TASCAM IF-AN/DM IF-AN/DM (OPTION) IF-AN/DM (OPTION)
  • Page 75 TASCAM DM-24 MAIN PCB SIDE A...
  • Page 76 TASCAM DM-24 MAIN PCB SIDE B...
  • Page 77 TASCAM DM-24 GATHER PCB, TRANSPORT (TRANSPORT PCB, LCD SUB PCB, MIDI PCB, TDIF PCB)
  • Page 78 TASCAM DM-24 GATHER PCB, MASTER (STUDIO PCB, C.ROOM PCB, DIGITAL I/O PCB, MASTER JACK PCB, MASTER AMP PCB, BUSS PCB)
  • Page 79 TASCAM DM-24 SIDE A FADER PCB...
  • Page 80 TASCAM DM-24 SIDE B FADER PCB...
  • Page 81 TASCAM DM-24 SIDE A MOTHER PCB SIDE B MOTHER PCB...
  • Page 82 TASCAM DM-24 SIDE A PANEL PCB...
  • Page 83 TASCAM DM-24 SIDE B PANEL PCB...
  • Page 84 TASCAM DM-24 GATHER PCB, INPUT (INPUT JACK PCB, MIC AMP PCB)
  • Page 85 TASCAM DM-24 GATHER PCB, POWER (POWER PCB, POWER SW PCB, TRANS1/2 PCB, TR1/2/3/4/5 PCB, BD PCB)
  • Page 86 TASCAM MU-24 GATHER PCB,METER BRIDGE (MASTER METER PCB, INPUT METER PCB) (OPTION) METER DRIVER PCB (OPTION)
  • Page 87 TASCAM IF-TD/DM, IF-AE/DM IF-TD/DM PCB (OPTION) IF-AE/DM PCB (OPTION)
  • Page 88 TASCAM IF-AD/DM, IF-CS/DM IF-AD/DM PCB (OPTION) IF-CS/DM PCB (OPTION)
  • Page 89 TASCAM IF-AN/DM SIDE A SIDE B IF-AN/DM PCB (OPTION) IF-AN/DM PCB (OPTION)

  • Page 90: Included Accessories

    TASCAM DM-24 10. INCLUDED ACCESSORIES INCLUDED ACCESSORIES...

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