Technics SH-DV250 User manual

ORDERNO.AD0103077C2
Sound Processor
SH-DV250
Colour
(S) ...................Silver Type
Area
EG .....................Europe.
System: SC-DV250
Because of unique interconnecting cables,when a
component requires servise,send or bring inthe entire
system.
Note: Refer to the service manual for Model No.
SA-DV250 (ORDERNO.AD0103076C2) for
information on “ACCESSORIES”and “PACKAGING”.
SPECIFICATIONS
Specification
1

EQ/SFP section
MANUALGEQ
5-band EQ center frequency: 70/ 300/ 1k/ 3.15k/ 10k Hz
Level control: +-2.0/ 4.0. 6.0dB
EQ/Space mode: 4 Modes, HEAVY, CLEAR,
SOFT, HALL
SUPER 3D AI EQ: 3Modes AI EQ, SUPER 3D
AI 1, SUPER 3D AI 2
Pre-amplifier section
Input sensitivity/ impedance
VCR (EXT): 250mV/ 15k
AUX (DVD): 250mV/ 15k
Output level
VCR RECOUT: 150mV/ 1.5k
Dolbyprologicsection
Prologicmode: SURROUND
Center mode: NORMAL
Delaytime: 20mSec.
AV surround section
AV surround mode: Super surround (music/
movie)
DSP control section
DSP control mode: Super sound EQ
Center focus
Virtual rear surround
Multi rear surround
Seat position
Spectrumanalyzer section
Displaymode: NORMAL, PEAKHOLD,
AURORA
General
Dimensions(WxHxD): 293x89x270mm
Weight: 1.5kg
Power Supply DC±10V/ -25V, AC4.6V
Power Consumption 7W
Notes:
1.Design and specificationsare subject tochangewithout
notice.
2.Dimensionsand weight are approximate.
System
Sound Processor: SH-DV250, DVD/ VideoCD/ CD changer: SL-
DV250, Stereotuner/ amplifier: SA-DV250, CassetteDeck: RS-
DV250, Speakers: Front (SB-DV250), Center (SB-PC95),
Surround (SB-PS95) (MadeinMAES)
2

2001 Matsushita ElectricIndustrial Co., Ltd. / / All rights
reserved. Unauthorized copying and / / distribution isaviolation
of law.
1. Before Repair
This equipment (SH-DV250), whichis the component of the system, is suppliedwithpowerfrom
the amplifier(SA-DV250).Whenrepairing this equipment orchecking operation of the system, be
sure toconnect the amplifierwithit.
Powersupplyand operation check inthe state of it as a single equipmenet are impracticable.
2. Operating Instructions
3. Operation Checks and Component Replacement
Procedures
-Thissection describes procedures for checking the operation of
the major printed circuitboards and replacing the main
components.
-For reassemblyafter operation checks or replacement, reverse the
respective procedures. Special reassemblyprocedures are
described onlywhen required.
/
3.1. Checking for the FL P.C.B.
/
/ / /
3

/
-Check the FL P.C.B. as shownbelow.
/ / /
3.2. Checking for the mainP.C.B.
-Follow the (Step 1) -(Step 3) of item 3.1.
4

/
/
-Check the mainP.C.B. as shownbelow.
5

4. Wiring Connection Diagram
5. Block Diagram
6. To Supply Power Source
This unit is designedtooperate on powersuppliedfromsystemconnected.
Whena component requires service, use the systemconnections tosupplypowersource.
Forsystemconnections. (RefertoFig. 1)
Fig. 1
7. Schematic Diagram Notes
7.1. Type Illustrations of IC’s, Transistors and Diodes
7.2. SchematicDiagram Notes
-Thisschematicdiagram maybe modified at anytime with
development of new technology.
Notes:
6

-S601: Displaymode (DISPLAYMODE) switch.
-S602: DOLBYPRO LOGIC( PRO LOGIC, OFF/ ON)switch.
-S603: Super surround (SUPERSURROUND)switch .
-S604: Super sound EQ (SUPERSOUND EQ)switch .
-S605: Center focus (CENTERFOCUS) switch.
-S606: Virtual rear surround (VIRTUALREAR SURROUND)switch.
-S607: Multi rear surround (MULTI REAR SURROUND)switch.
-S608: Jog control ( )switch.
-S609: Jog control ( )switch.
-S610: Jog control ( )switch.
-S611: Jog control ( )switch.
-S612: Super 3DAI EQ (SUPER3DAI EQ)switch.
-S613: Seat position (SEATPOSITION)switch.
-S614: Joystick (MULTI JOG)switch.
-Indicated voltage values are the standard values for the unit
measured bythe DC electroniccircuittester (high-impedance)
with the chassistaken as standard. Therefore, there mayexist
some errors inthe voltage values, depending on the internal
impedance of the DC circuittester. /
Nomark: Poweron
Important safetynotice:
Components identifiedbymark have special characteristics impotant forsafety.
Furthermore, special parts whichhave purpose of fire-retardant (resistors), high-qualitysound
(capacitors), low-noise (resistors), etc. are used. Whenreplacing anyof components, be sure to
use onlymanufacture’s specifiedparts showninthe parts list.
Caution!
-ICand LSI are sensitive to staticelectricity.
-Secondarytroublecan be prevented bytaking care during repair.
-Cover the parts boxes made of plastics with aluminum foil.
-Ground the soldering iron.
-Put aconductive mat on the work table.
-Donot touch the legs of ICor LSI with the fingers directly.
Voltage and signal line
7

: Positive voltage line
: CD Playback signal line
: Negative voltage line
8. Schematic Diagram
9. Printed Circuit Board Diagram
10. Terminal Function of IC's
10.1. IC601(C2BBGF000251):System control/FL drive
Pin
No. Mark I/O / Division Function
1KEY1 I Operation key1 signal input
terminal
2 KEY2 I Operation key2 signal input
terminal
3 SP IN I A/D signal input terminal
fromIC602
4 SP A O Band select signal output
terminal forIC602
5 SP B O Band select signal output
terminal forIC602
6 SP C O Band select signal output
terminal forIC602
7 SA CS I Chipselect signal input
terminal
8 DSP
RST O Reset signal output terminal forIC401
9 DSP CS O Chipselect signal output
terminal forIC401
10 DSP
SNS I Sense signal input terminal fromIC401
11 DSP
ACK I Acknowledge signal input terminal fromIC401
12 DSP CK O Clock signal output
terminal forIC401
13 DSP DO O Data signal output terminal
forIC401
8

Pin
No. Mark I/O / Division Function
14 DSP DI I Data signal input terminal
forIC401
15 JOGA I JOG A signal input terminal
16 JOGB I JOG B signal input terminal
17 CNVSS I ConnectedtoGND through
resistor
18 RESET I Systemreset signal input
terminal
19 NC - Not used, open
20 NC - Not used, open
21 VSS - GND terminal
22 XIN I Ceramic oscillatorinput
terminal (f=4MHz)
23 XOUT O Ceramic oscillatoroutput
terminal (f=4MHz)
24 VCC I Powersupplyinput terminal
25 NC - Not used, open
26 NC - Not used, open
27 LED
CFO OORANGE LED(CENTER FOCUS) signal output
terminal
28 LED
CFG OGREEN LED(CENTER FOCUS) signal output
terminal
29 BR93
DATA IData signal input terminal fromEEPROM
30 BR93 CS O Chipselect signal output
terminal forEEPROM
31 BR93 CK O Clock signal output
terminal forEEPROM
32 SYNC I Powerfailure detect signal
input terminal
33 SA REQ O Request signal output
terminal forTuner/Amplifier
34 SA CK O Serial communication
signal output terminal for
Tuner/Amplifier
35 SA DO O Serial communication
signal output terminal for
Tuner/Amplifier
36 SA DI I Serial communication
signal input terminal from
Tuner/Amplifier
9

Pin
No. Mark I/O / Division Function
37 LED SSS O LED(SUPER
SURROUND)signal output
terminal
38 LED DPL O LED(DOLBY PRO LOGIC)
signal output terminal
39 LED
SPO O ORANGE LED (SEAT POSITION) signal output
terminal
40 LED
SPG O GREEN LED (SEAT POSITION) signal output
terminal
41 LED
3DO O ORANGE LED (3D ENHANCED SURROUND)
signal output terminal
42 LED
3DG O GREEN LED (3D ENHANCED SURROUND)
signal output terminal
43 LED
MRO O ORANGE LED (MULTI REAR SURROUND) signal
output terminal
44 LED
MRG O GREEN LED (MULTI REAR SURROUND) signal output
terminal
45 LED
VRO O ORANGE LED (VIRTUAL REAR SURROUND) signal
output terminal
46 LED
VRG O GREEN LED (VIRTUAL REAR SURROUND) signal
output terminal
47-
80 P1-P34 O Segment signal output terminal
81 --- - Not used, open
82-
88 7G-1G O Gridsignal output terminal
89 VEE I Powersupplyinput terminal
90 CD&
DECK DI I Data signal input terminal (DVD and deck machanism)
91 CD&
DECK
DO
O Data signal output terminal
(DVD and deck machanism)
92 CD&
DECK
CK
I Clock signal input terminal
(DVD and deck machanism)
93 NC - Not used, open
10