Tascam DM-24 ユーザーマニュアル

Effective : July, 2002

S-0065

SERVICE MANUAL

CONTENTS

1. SPECIFICATIONS 2

2. SELF DIAGNOSTIC FUNCTION

7

3. HOW TO CHECK THE MAIN PCB VERSION

20

4. DOWNLOADING & BACKING-UP THE SRAM DATA

21

5. UPDATING THE PROGRAM

23

6. ERROR MESSAGES

29

7. BLOCK DIAGRAMS

38

8. EXPLODED VIEWS AND PARTS LIST

57

9. PC BOARDS AND PARTS LIST

65

10. INCLUDED ACCESSORIES

90

DDMM--2244

Digital Mixing Console

INSTRUCTIONS FOR SERVICE PERSONNEL

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.

2

1. SPECIFICATIONS

TASCAM DM-24

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

PHANTOM (+48V)

+48V phantom power. Switchable in blocks of 4 chan-

nels (1–4, 5–8, 9–12, 13–16)

LINE IN (BAL) inputs (channels 1 through 16)

Balanced 1/4” jacks (sleeve=ground, ring=cold, tip=hot)

Adjustable input level: –42dBu (TRIM max) to +12dBu

(TRIM min)

Input impedance: 10kΩ

INSERT connections (channels 1 through 16)

1/4” TRS jacks (sleeve=ground, ring=return, tip=send)

Send: nominal output level –2dBu, maximum output

level +20dBu, output impedance 100Ω

Return: nominal input level –2dBu, headroom 16dB,

input impedance 10kΩ

ASSIGNABLE RETURNS (BAL) (1 through 4)

Balanced 1/4” jacks

Nominal input level: –2dBu

Headroom: 16dB

Input impedance: 5kΩ

ASSIGNABLE SENDS (1 through 4)

Quasi-balanced 1/4” jacks

Nominal output level: –2dBu

Maximum output level: +14dBu

Output impedance: 100Ω

2 TR IN (L/R)

2 x RCA pin jacks

Nominal input level: –10dBV

Headroom: 16dB

Input impedance: 10kΩ

STEREO OUTPUT (L/R)

Balanced XLR-type male connectors

Nominal output level: +4dBu

Maximum output level: +20dBu

Output impedance: 100

STEREO INSERT (L/R) 1/4” TRS jacks

Send: nominal output level –2dBu, maximum output

level +14dBu, impedance 100Ω

Return: nominal input level –2dBu, headroom 22dB,

impedance 10kΩ

SETUP

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

PHONES 2 x 1/4” stereo jacks

Maximum output level: 120 mW + 120 mW (33Ω load)

DIGITAL INPUTS (1, 2)

2 x XLR-type female connectors (input impedance 110Ω)

2 x RCA pin jacks (input impedance 75Ω)

AES3-1992 or IEC60958 data format (automatically

detected)

24-bit word length

Switchable sampling frequency conversion available

DIGITAL OUTPUTS (1, 2)

2 x XLR-type male connectors (output impedance 110Ω)

2 x RCA pin jacks (output impedance 75Ω)

AES3-1992 or IEC60958 data format (software selec-

table)

24-bit word length

TDIF-1(1, 2, 3)

3 x 25-pin D-sub connectors (metric lock screws)

Conform to TDIF-1 standard

24-bit word length

ADAT IN/OUT

2 x “Lightpipe” optical connectors

Conform to ADAT OPTICAL specifications

24-bit word length

Sampling frequencies

Internal 44.1kHz/48kHz, 88.2kHz/96kHz (high sampling

frequencies)

External ±6.0% ofIs

WORD SYNC IN

BNC connector

Switchable 75Ω termination

TTL level

WORD SYNC OUT/THRU

BNC connector

Switchable between through and output

TTL level

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” mono jack

TO METER

25-pin D-sub connector (non-metric lock screws)

For use with the optional MU-24/DM

RS-422 (for Sony 9-pin)

9-pin female D-sub connector (non-metric lock screws)

wired to RS-422 standards

GPI (for Machine start)

9-pin female D-sub connector (non-metric lock screws)

wired for GPI control

Pin 1=GPI1, Pin 2=GPI2, Pin 3=GPI3, Pin 4=GPI4, Pin

5=GPI5, Pin 6=GPI6,

Pin 7=GPI7, Pin 8=GPI8, Pin 9=ground

EQ switch

On/Off

HIGH filter

Gain: ±18dB, 0.5dB resolution

Frequency: 31Hz to 19kHz

Q: 0.27 to 8.65

Type: Hi-shelving, Peak, LPF

HI MID filter Gain: ±18dB, 0.5dB resolution

Frequency: 31Hz to 19kHz

Q: 0.27 to 8.65

Type: Peak, Notch

LO MID filter

Gain: ±18dB, 0.5dB resolution

Frequency: 31Hz to 19kHz

Q: 0.27 to 8.65

Type: Peak, Notch

LOW filter

Gain: ±18dB, 0.5dB resolution

Frequency: 31Hz to 19kHz

Q: 0.27 to 8.65

Type Low-shelving, Peak, HPF

5

TASCAM DM-24

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 – 20kHz +0.5dB/– 1.0dB

LINE IN to BUSS/AUX OUTPUT

20Hz – 20kHz +0.5dB/– 1.0dB

2TR IN to MONITOR OUTPUTS

20Hz – 25kHz +0.5dB/– 1.5dB

Noise level (20Hz – 20kHz, TRIM:max, 150Ω, – 60dB)

MIC IN to INSERT SEND: < – 128dBu

MIC IN to STEREO OUTPUT (BAL): < – 68dBu

MIC IN to STEREO OUTPUT (UNBAL): < – 74dBu

MIC IN to BUSS/AUX OUTPUT: < – 74dBu

2TR IN to MONITOR OUTPUT: < – 80dBu

Crosstalk @ 1kHz

STEREO/BUSS/AUX OUTPUTS: > 80dB

MONITOR OUTPUTS: > 70dB

Displays

Backlit 320 x 240 LCD with contrast control

2 x 12-segment LED meters

Faders

17 x 100mm stroke, motor-driven touch-sensitive faders

Maximum overall dimensions (w x d x h) including rest

582 x 657 x 198 (mm) 22.9 x 25.9 x 7.8 (in)

Weight

20.5kg (45.1lbs)

Voltage requirements

120VAC, 60Hz

230VAC, 50Hz

240VAC, 50Hz

Power consumption

82W

Peak inrush current

8A

Applicable electromagnetic environment

E4

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7

TASCAM DM-24

2. SELF DIAGNOSTIC FUNCTION

Power to the unit while holding down 2ND F. + EQUALIZER

[HIGH] + LIBRARY [-] (until "TASCAM" appears scrolling).

Then the DIAG menu screen will appear, as the illustration

below shows.

You can move the cursor through the test items by using the cur-

sor keys or 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

more than 3.9 V).

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.

2. Press a cursor key to return to the DIAG menu screen. If all

the LEDs are in order, the LED TEST item is check marked.

You can press SHIFT + ENTER during ALL LED TEST.

Then the next pop-up message will appear and the LEDs will

illuminate one at a time in sequence. Pressing a cursor key

brings you back to the DIAG menu screen.

(This test does not run on the meter bridge.)

9

TASCAM DM-24

Ó

Á

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.

2. Press the switches in sequence, the on-screen images of

which are blinking. Each time you press a switch, the corre-

sponding on-screen image goes out.

Pressing a switch associated with an LED causes the LED to

illuminate to indicate the switch is activated. The LED turns

off when the switch is deactivated.

3. Upon completion of the check of all the switches, the DIAG

menu screen reappears with the SW TEST item check

marked.

To abort the switch test, press the left (Ó) and right (Á)

cursor keys at the same time.

When the switch test is being conducted on the DM-24 and

you press SHIFT + ENTER, the switch test shifts to the

meter bridge (MU-24). Pressing ENTER brings you back to

the DIAG menu screen.

The switches on the meter bridge are tested in the same way

the switches on the DM-24 are.

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.

2. An arrow mark is displayed below the image of a fader to be

moved. Push up and bring down that fader. A frame should

be displayed around the fader and the reading and CH num-

ber are displayed in the upper part of the screen.

3. If the fader works properly providing the prescribed maxi-

mum and minimum values, go on to the next fader. The

image of the previous fader, which has been checked, goes

out.

4. When all the faders have been checked, an arrow mark is dis-

played below the SOLO knob image.

5. Turn the SOLO knob all the way up then all the way down,

then the DIAG menu screen reappears with the

FADER/SOLO VR READ TEST item check marked.

If a fader offers the maximum/minimum value when it is not

in the uppermost/lowermost position, something goes wrong

with FADER/SOLO VR. Remember that this irregularity

does not result in a test failure and a check mark is put to the

FADER/SOLO VR READ TEST item on the menu.

To abort the fader read test, press ENTER.

11

TASCAM DM-24

FADER TOUCH TEST

This test checks the faders for touch sensitivity. This test also

checks if, when a single fader is touched, only that fader senses

it or if, when two or more faders are touched, they all sense it.

1. When the DM-24 switches into the FADER TOUCH TEST

mode, the following screen will appear.

2. Touch the fader, below the on-screen image of which an

arrow mark is displayed.

The number assigned to a fader to be touched is shown in the

upper part of the screen, along with the number assigned to

the actually touched fader.

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.

4. When all the faders have been successfully checked, the

DIAG menu screen reappears with the FADER TOUCH

TEST item check marked.

If faders are not recognized correctly, try changing the

CLOCK setting for FADER SESITIVITY on the SET UP

sub-screen under the OPTION screen.

Also, you can set the FADER SENSITIVITY setting to [ON]

so that the ON/STATUS LED is available to check the fader

sensitivy.

To abort the fader sensisvity test, press ENTER.

12

TASCAM DM-24

FADER MOTOR TEST

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.

All the faders move from MIN value MAX value MIN

value 15 dB (or 25 dB with the STEREO fader).

2. When all the faders have moved through the positions indi-

cated above, the next pop-up message would appear.

3. When you press a cursor key, the pop-up message goes out

and the DIAG menu screen reappears with the FADER

MOTOR TEST item check marked.

Pressing SHIFT + ENTER at the Multiple Fader Motor

TEST time, the next pop-up message appears and the Single

Fader Motor TEST starts.

The faders move from MIN value MAX value MIN

value in 1 frame steps sequentially, starting with the fader on

CH 1. To abort the process, press a cursor key.

13

TASCAM DM-24

POD & DIAL TEST

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. (First, the JOG/DATA dial will be indicated.)

3. Rotate the POD all the way down (to the left) then all the

way up (to the right), and go on to the next POD.

4. When all the PODs have been checked, the DIAG menu

screen reappears with the POD & DIAL TEST item check

marked.

PTo abort the process, press ENTER.

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) All

Turned On (about 1 second) DIAG menu (about 1 second).

2. Pressing ENTER brings you back to the DIAG menu screen

with the LCD TEST item check marked.

COMMUNICATION TEST

This test checks the MIDI I/O and RS422 for irregularity.

This test is conducted largely by letting data be looped, as inter-

nally directed, and checking if the same data returns back.

1. When the DM-24 switches into the COMMUNICATION TEST

mode, the following screen will appear.

2. To run the following tests, make the indicated connections.

MIDI OUT TEST:

Connect a MIDI cable from MIDI OUT to MIDI IN.

MTC OUT TEST:

Connect a MIDI cable from THRU/MTC OUT to MIDI IN.

RS-422 TEST:

Get a 9-pin D-sub connector ready, and short-circuit pins 2-8

and 3-7, then connect this connector to the RS-422.

3. Move the cursor to a test item and press ENTER to run the cor-

responding test.

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.

This pop-up message goes out when you press a cursor key.

No check mark is placed in the check box and the RESULT

reads NG.

6. Move the cursor to EXIT in the COMMUNICATION TEST

screen and press ENTER to return to the DIAG menu screen. If

all the three test items are successfully checked on the COM-

MUNICATION TEST screen, the COMMUNICATION TEST

item on the DIAG menu screen is check marked.

16

TASCAM DM-24

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.

Pressing a cursor key stops sending out the GPI pulse signal.

3. Pressing a cursor key stops the GPI pulse signal, bringing you

back to the DIAG menu screen.

The GPI TEST item is check marked if there is no problem in

sending out the GPI pulse signal.

17

TASCAM DM-24

SRAM INIT for Factory TEST

This procedure makes the SRAM available for use on a produc-

tion line.

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. Upon completion of the initialization,

the pop-up message will go out, bringing you back to the

DIAG menu screen with a check mark placed in the corre-

sponding check box.

Pressing a cursor key aborts the initialization.

SRAM INIT

This procedure initializes the SRAM to factory defaults.

CAUTION:

When initializing the SRAM, all setting data except for the

LIBRARY data are cleared. If necessary, make a backup of the

SRAM data, as discussed on page 21.

The LIBRARY data is not cleared because it is on the Flash

ROM.

1. When the DM-24 switches into the SRAM INIT mode, the

following pop-up message will appear.

2. Press ENTER and the SRAM starts being initialized.

Upon completion of the initialization, the pop-up message

will go out, bringing you back to the DIAG menu screen with

a check mark put in the corresponding check box.

Pressing a cursor key cancels the initialization.

18

TASCAM DM-24

SRAM DUMP [MIDI]

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.

Pressing a cursor key cancels the dump and brings you

back to the DIAG menu screen.

The next pop-up message is displayed during the dump

process.

Once the process starts, there is no way to abort it.

3. Upon completion of the dump, the pop-up message automati-

cally goes out, bringing you back to the DIAG menu screen

with a check mark placed in the corresponding check box.

19

TASCAM DM-24

FLASH INFORMATION CLEAR

This procedure clears the area of SRAM where is recorded the

number of times the FLASH ROM has been written on.

CAUTION:

The FLASH ROM life is rated to 100,000 of write times, so the

information on how many times the FLASH ROM has been

written on is essential to being aware of its precise remaining

useable life.

This information is visible on the PREFERENCE sub-screen

under the OPTION screen.

Beware: Running the following procedure clears the information

about the number of times the FLASH ROM has been written

on. Also beware: The number of times you repeat the following

procedure is recorded on the SRAM. This record, however, is

NOT erased by SRAM INIT.

BE SURE TO RUN THIS PROCEDURE

WHEN THE FLASH ROM IS REPLACED,

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

of times the FLASH ROM has been written on is cleared and

the screen is switched to show the DIAG menu screen with a

check mark placed in the corrresponding box unless the pro-

cedure failed.

Pressing a cursor key cancels the procedure, bringing you

back to the DIAG menu screen.

The number shown next to the question mark ("?") indi-

cates how many times you have repeated this procedure

so far.

EXIT

This menu item is used to terminate the DIAG mode.

Upon terminating the DIAG mode, the DM-24 automatically

restarts and switches itself into normal mode.

20

3. HOW TO CHECK THE MAIN PCB VERSION

TASCAM DM-24

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.

3. Press SHIFT + REPEAT + RHSL once to go back to the nor-

mal screen.

21

TASCAM DM-24

«

4. DOWNLOADING & BACKING-UP THE SRAM DATA

You need to run the following procedure when the SRAM is

cleared, the MAIN PCB is replaced, or the SRAM backup bat-

tery is replaced.

The SRAM keeps data about the current various settings except

the LIBRARY data.

CAUTION:

Do NOT stop the download or the backup procedure in the

process. Otherwise, there are occasions where the system data is

lost.

Required Equipment

MIDI cable

Either a computer program that is capable of recording/play-

ing back the MIDI system exclusive data, or a MIDI

sequencer (or MIDI Data Filer) equipped with a floppy disk

drive

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 18.)

Downloading the SRAM data

1. Get to the BULK sub-screen under the MIDI/MC screen,

move the cursor to the [BULK LOAD] button, then press

ENTER.

2. When the following pop-up message appears, press ENTER.

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Tascam DM-24 ユーザーマニュアル

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