Akai DPS 12 Service Manual

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Akai DPS 12 Service Manual

Extracted text from Akai DPS 12 Service Manual (Ocr-read)


Page 1

.m -.t

DIGITAL PERSONAL STUDIO

MODEL DPS'I 2

OPTIONAL BOARD

* SPECIFICATIONS

MODEL EB2M

Recording media Internal JAZ drive (1G byte),
or an external JAZ or hard disk
Sampling rate ..................... 48 kHz, 441 kHz, 32 kHz

Recording time (Using a 1 G byte JAZ disk, total recording time)
FS=48 kHz .. Approx. 3 hours
(12 tracks x 15 minutes)
FS=44.1 kHz .................... Approx. 3 hours 16 minutes
(12 tracks x 16.3 minutes)
Approx. 4 hours 30 minutes
(12 tracks x 22.5 minutes)

FS=32 kHz

Number of simultaneous

recording tracks ........... 8
Frequenqr response
FS=4B kHz ., 10 Hz < 22 kHz i 2.0 dB

FS=44.1 kHz
FS=32 kHz
Quantization bi
ADC ...............

10 Hz - 20 kHz 1 2.0 dB

10 HZ- 15 kHz 12.0118

16 bit linear

18 bits, 64-times oversampling,
Fifth order delta/sigma modulation

DAC .................................... 20 bits, 8-times oversampling.
1 bit delta/sigma method
Dynamic range ................... 85 dB or higher (terminal

resistance 100 Q)

0.05 % or less

(standard level: 1 kHz, FS = 48 kHz)
Channel crosstalk ............... 75 dB or higher (10 kHz standard,
terminal resistance 100 a)

Lower than measurable limit.

a 6.3mm stereo phone jack
(balanced/unbalanced connection)

Distortion

Wow and llutter ......
Analog audio input

Input level ........................ -46 dBu i4 dBu
(max. +19 dBu, at 1 kHz)
Impedance 15 kfl


Analog audio output .......... to 6.3mm stereo phone jack
(balanced/unbalanced connection)
Output level
MASTER OUT 10 dBu (max. = 5 dBu/47 kQ)
AUX SEND 10 dBu (max. .= S dBu/47 k0)
Impedance 1 kfl (MASTER OUT)

100 a) (AUX SEND)
o 6,3mm stereo phone jack x 1
24 mW/32 (2
Optical (SPDIF)
.Optical (SPDIF)
6.3mm phone jack x 1

Stereo phone output ,

Maximum output .
Digital audio input
Digital audio output
Foot switch


SCSI Half pitch 50~pin
(for external hard disk) x 1
Display 248 x 60 dots. backlit. graphical LCD

, 0100 V, 50/60 HztorJapanAC117
V, 60 Hz for USA. and Canada
AC220-240 V 60 Hz for Europe

21 W (with internal JAZ drive)

Power supply .,

Power consumption
Operating temperature 10-C - 35°C

Operating humidity ..... 10 % - 60 % (no condensation allowed)
Dimensions (mm) .............. 445 (W) x 98 (H) x 334 (D) (M a x.
443.5 measured on the protection)

43 kg

Weight

ACCESSORIES
Operator-s manual ..
3 pin powercable

1
.1 (with a two polar conversion plug)

OPTION ............................. EBZM (Effect board)

* For improvement purposes. specifications and design are subject to change without notice.

0 dBu = 0.775 v

Page 2

* SAFETY INSTRUCTIONS

* INFORMATIONS

PRECAUTIONS DURING SERVICING

1. Parts identified by the A symbol are critical for safety.
Replace them only with the pans number specified.

2. In addition to safety, other parts and assemblies are
specified for conformance with such regulations as those
applying to spurious radiation.

These must also be replaced only with the specified

replacements.

Examples : RF converters, tuner units, antenna selector
switches, RF cables, noise blocking capacitors,
noise blocking filters, etc.

3. Use specified internal wiring. Note especially :

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

4. Use specified insulating materials for hazardous live parts.
Note especially :

1) Insulation Tape

2) PVC tubing

3) Spacers (insulating barriers)

4) insulation sheets for transistors

5) Plastic screws for fixing micro switches

5. When replacing AC primary side components (trans-
formers, power cords, noise blocking capacitors, etc),
wrap the ends of the wires securely around the terminals
before soldering.

sir-s»?

6. Make sure that wires do not contact heat prodUCing parts
(heat sinks. oxide metal film resistors. fusible
resistors, etc.).

7. Check that replaced wires do not contact sharp edged or
pointed parts.

8. Also check areas surrounding repaired locations.

9. Make sure that foreign objects (screws, solder droplets,
etc.) do not remain inside the set.

SAFETY CHECK AFTER SERVICING

After servicing, make measurements of leakage-current or
resistance in order to determine that exposed parts are
acceptably insulated from the supply circuit. The leakage-
current measurement should be done between accessible
metal parts (such as chassis, ground terminal, microphone
jacks, signal input/output connectors, etc.) and the earth ground
through a resistor- of 1500 ohms paralleled with a 0.15 pF
capacitor, under the unit-s normal working conditions.

The leakage-current should be less than 0.5 mA rms AC. The
resistance measurement should be done between accessible
exposed metal pans and power cord plug prongs with the
power switch (it included) -ON". The resistance should be
more than 2.2 M ohms.

SYMBOLS FOR PRIMARY DESTINATION

Unit destinations are indicated with letters as shown below.

Symbols Principal Destinations

U.S.A

UK

Canada

Europe (except UK)
Japan

Australia
Germany
Universal Area

SERVICE MANUAL

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