Technics SCDV 290 Service Manual

Page 1

ADO30301OC8

Service Manual

Cassette Deck

RS-DV290EG
Colour
(S)..........Silver Type

Remote
Central
Transmitter

SL-EHSSO SH-EHSSH

sB-EHssu RS-DVZBD SA-EHSJU sB-EHsso

SPECIFICATIONS
system sc-EHsso
Sound Processor SH-EHSQO
Because of unique interconnecting cables. when a component Tuner/Amplifier SA-EHSSO
requires service, send or bring In the entire system. co Player SL-EHSSU
Cassema Deck Hs-szso
Front Speakers SB-EHSQG

* : Made in Singapore.

Specifications

Deck system: Stereo cassette deck SIN (Signal level = max recordlng level. TYPE 11 type tape):
Track system: 4 track, 2 channel NR ufl; 56 dB (A weighted)
Recording system: AC bias Dolby B NH on; 66 dB [A weighled]
Bias frequency: 100 kHz Input sensitivity and impedance:
Erasing system: AC erase REC (IN): 150 mV/ 23 kn
Heads: Output voltage and impedance:
Deck 1 PLAY (OUT); 280 mV/ 360 51
(Playback head); Permalloy head General
Deck 2 Dimensions (WXHXD): 294m l85x281 mm
(Recording/Playback headl: Fem-alloy head Mass: 21 k9
(Erasing head); Double gap Ierrlte head
Mom's; Notes: Specifications are subject to change Without notice
Deck 1, 2 Capslan drive; DC servD motor Mass and dimensions are approximate
Tape speed: 4.8 cm/s
Wow and flutter: 0:16 "/e (WHMSJ

Manufactured under license from Dolby Laboratories.

Fas' mam "d W'MI'MBS: App'ox'cjggcsgnggg: 'Dolby" and me acumen symbol are trademarks or Dolby
Frequency response (Dolby NR ofl): Emmy

TYPE I (NORMAL); 20 Hz - 16 kHz (DlN)

TYPE 1'1 (HIGH); 20 Hz - is kHz (DlN)

TYPE IV (METAL); 20 H2 716 kHz (DlN)

Page 2

A. WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced prolessional technicians Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Technics
1. Note

Refer to the service manual for Model No. SA-EH590EG, SA-EH590EP (Order No. AD0302008C8)
for information on Accessories and Packaging.

2. Location of Controls

3. Operation Checks and Component Replacement I

Procedures

- This section describes procedures for checking the operation of
the major printed circuit boards and replacing the main
components.

- For reassembly after operation checks or replacement, reverse the
respective procedures. Special reassembly procedures are
described only when required.

3.1. Checking for the main P.C.B.

Step 3)
emove the top cabinet.

9x4

- Check the main P.C.B. as shown above.

3.2. Checking for the operation P.C.B.
- Follow the (Step 1) - (Step 3) of item 3.1.

Page 69

- S913: Digital super woofer (DIGITAL S. WOOFER) switch.

- S914, 915: RDS display mode (RDS, PS-DISP, MODE-PTY) switches.
For [EE] area.

3914, 915: KARAOKE, Voice mute (KARAOKE, V.MUTE) switch.
For [GN] area.

- S916: Key control (KEY CON) switch. For [GN] area.

- S917: MIC effect (MIC EFFECT, LOUNGE) switch. For [GN] area.

- $918: MIC effect (MIC EFFECT, CHORUS) switch. For [GN] area.

- VR901: Main volume V.R..

- Indicated voltage values are the standard values for the unit
measured by the DC electronic circuit tester (high-impedance)with
the chassis taken as standard. Therefore, there may exist some
errors in the voltage values, depending on the
internalimpedanceofthe DC circuit tester.

No mark: Power ON
- Important safety notice:
Components identified by A mark have special characteristics
important for safety.
Furthermore, special parts which have purposes of fire-retardant
(resistors), high-quality sound (capacitors), low-noise (resistors),
etc. are used.
When replacing any of components, be sure to use only
manufacture's specified parts shown in the parts list.

Caution!

- Secondary trouble can be prevented by taking care during repair.

- IC and LSI are sensitive to static electricity.

- Cover the parts boxes made of plastics with aluminum foil.

- Ground the soldering iron.

- Put a conductive mat on the work table.

- Do not touch the legs of IC or LSI with the fingers directly.

- Voltage and signal lines
-I-: Positive voltage line
-i--: Negative voltage line
:3»: Audio signal line
-: Tuner signal line
mt»: MIC signal line

Page 108

ORDER NO.AD0303068C8

Service Manual

Sound Processor

un-

PRO-LOGIC

SH-DV290EG

Colour

(S) ................... Silver Type

System: SC-DV290

Because of unique interconnecting cables,when a
component requires servise,send or bring in the entire
system.

Note: Refer to the service manual for Model No.
SA-DV290E/EG/EB (ORDER N0.ADO303067CZ) for
information on ACCESSORIESand PACKAGING.

SEPSBS 559595

[g]

Q I a

SE-DVZQB sa-Pcss RS

SPECIFICATIONS

Specification

Page 150

ORDER NO.AD0305101 C8

Service Manual

DVDNideo CD/CD changer

% @E_E"@

AUDIO/VIDEO _GA"V'DE°
SL-DV290EE / SL-DVZQOGN
Colour
(s) .................... Silver Type

System:SC-DV290

Because of unique interconnecting cables, when a
component requires service, send or bring in the entire
system.

Note: Refer to the service manual for Model No.SA-
DV290EE/GN (ORDER NO.AD030510008) for
information on ACCESSORIES and PACKAGING.

sBPses sBrPsss

Ifi

SL-DV290 sN-szso A

sa- nvzau 55- Pass F5- DVZW 5 DVM sa- uvm

SPECIFICATIONS

Specification

Page 158

Operation P.C.B.

Claws

(Step 6)
Release the 3 claws. and then
remove the operation P.C.B..

- Check the operation P.C.B. as shown below.

5.3. Checking for the main P.C.B.

- Follow the (Step 1) - (Step 3) of item 5.1.

- Follow the (Step 1) - (Step 5) of item 5.2.
Transistor holder

(Step 1)
M0x2

\9

NOTE:

Tighten enough the screw (9)
after replacing the transistor
holder.

- Check the main P.C.B. as shown below.

Page 206

SYSTEM CLOCK

INITIAL/LOGO ABBREVIATIONS
T TE TRACKING ERROR
TIBAL BALANCE CONTROL
TID BALANCE OUTPUT 1
TIN BALANCE INPUT
TIP BALANCE INPUT
TIS BALANCE OUTPUT 2
TPSN OP AMP INPUT
TPSO OP AMP OUTPUT
TPSP OP AMP INVERTED INPUT
TRCRS TRACKCROSSSIGNAL
TRON TRACKINGON
TRSON TRAVERSESERVO ON
INITIAL/LOGO ABBREVIATIONS
V VBLANK V BLANKING
VCC COLLECTOR POWER SUPPLY
VOLTAGE
VCDCONT VIDEO CD CONTROL
(TRACKING
VDD BALANCE)
VFB DRAIN POWER SUPPLY
VREF VOLTAGE
VSS VIDEO FEED BACK
VOLTAGE REFERENCE
SOURCEPOWERSUPPLYVOLTA
W WAIT BUS CYCLE WAIT
WDCK WORD CLOCK
WEH WRITE ENABLE HIGH
WSR WORD SELECT RECEIVER

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