How it Works
Sanyo
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DCDA-370
Service manual
30 pgs2.21 Mb0
Service Manual
24 pgs1.17 Mb0
Instruction Manual
12 pgs1.1 Mb0
Table of contents
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Sanyo DC DA370 Service Manual

FILE NO.
Service Manual

Contents

Micro Component System
DC-DA370 (AU)
PRODUCT CODE No. 129 599 06
Specifications...................................................................1
System connections.........................................................1
Laser beam safety precaution..........................................2
CD pick-up maintenance..................................................2
CD player adjustments.....................................................2
Tape adjustments ............................................................3
Tuner adjustments ...........................................................4
What to do if.....................................................................5
When assembling the Rack Gear and CD Lid .................5
When replacing LED (D6310) .......................................... 5
Exploded view
(Cabinet & Chassis) ...................................................... 6
(Tape mechanism) ........................................................ 11
Parts list
(Cabinet & Chassis) ...................................................... 7
(CD mechanism) ...........................................................7
(Tape mechanism) ........................................................ 11
IC block diagram & description ........................................ 11
LCD display description ................................................... 15
Schematic diagram
(CD)...............................................................................16
(FRONT) ....................................................................... 18
(AMPLIFIER )................................................................ 24
(TUNER) ....................................................................... 26
Wiring diagram
(CD & FRONT).............................................................. 20
(TUNER & AMPLIFIER ) ...............................................22
(PRIMARY + SECONDARY POWER
TRANSFORMER AND CD LID SWITCH)....................28
Voltage Table ...................................................................29
Wiring connection ............................................................31
REFERENCE No.
SM5810214

SPECIFICATIONS

Tuner
Reception frequency.............. FM : 87.5 - 108.0 MHz
MW: 522 - 1710kHz (9kHz step)
520 - 1710kHz (10kHz step)
CD player
Channels................................ 2-channel stereo
Sampling frequency ............... 44.1 kHz
Pick-up................................... Optical 3-beam
semiconductor laser
Wow and Flutter..................... Below measurable limits
Wave length........................... 790 nm
Laser output........................... 0.6mW(Continuous wave max.)
Cassette deck section
Track system ......................... 4-track, 2-channel stereo
Frequency response .............. 60 Hz - 13.5 kHz
Signal to noise ratio ............... 50 dB
Wow and Flutter..................... 0.12% (WRMS)
Fast forward / Rewind time .... Approx. 110 sec. (C-60)

SYSTEM CONNECTIONS

General
Output power ......................... 12.5W x 2
(at 4 ohms, 10% distortion)
Inputs ..................................... VIDEO IN : 400 mV / 50k ohms
Outputs .................................. SPEAKERS : 4 ohms
PHONES : 8 - 32 ohms
OPTICAL OUT:Optical
Power requirements............... AC 230-240, 50Hz
Power consumption ............... 40 W
Dimensions (W x H x D) ........ Approx. 160 x 251 x 207 mm
Weight.................................... Approx. 3.2 kg
Speaker system
Type....................................... 3 way bass reflex
Unit used : Woofer ................. 10 cm cone type
: Mid range............. 5 cm cone type
: Tweeter................ 2 cm piezoelectric
Maximum
power-handling capacity ..... 25 Watts (peak)
Nominal impedance ............... 4 ohms
Dimensions (W x H x D) ........ Approx. 150 x 245 x 224 mm
Weight.................................... Approx. 1.9 kg (per speaker)
Specifications subject to change without notice.
FM outdoor aerial
OFF 220-240V 1
10-120V
VOLTAGESELECTOR
AM loop aerial
FM indoor aerial
Digital equipment
Video equipment
Amplifies subwoofer
(not supplied)
R ch speaker
L ch speaker
To an AC outlet
- 1 -

LASER BEAM SAFETY PRECAUTION

VOLTAGESELECTOR
OFF 220-240V 1
10-120V
• Pick-up that emits a laser beam is used in this CD player section.
CAUTION :
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE
LASER OUTPUT..........0.6 mW Max. (CW)
WAVELENGTH .............790 nm
CAUTION – INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM. ADVARSEL – USYNLIG LASER STRÅLING VED ÅBNING, NÅR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION, UNDGÅ UDS ÆTTELSE FOR STRÅLING. VARNING – OSYNLIG LASER STRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRR ÄR URKOPPLAD. STRÅLEN ÄR FARLIG.
VORSICHT – UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT IST. NICHT, DEM STRAHL AUSSETZEN.
VARO – AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

CD PICK-UP MAINTENANCE

About pick-up (Optical lens) Cleaning
Clean a lens with swab of the cotton which moistened it with alcohol, cleaning paper or cleaning disc appointed.
Specified cleaning disc : LC-1 (Part code : 645 026 1961 ..... manufactured by SANYO.)
Show a clean procedure in the following in reference by swab of cotton.
1. Cotton swab is wrapped with Cleaning paper.
2. Add the isopropyl alcohol.
3. Gently move the tip of cotton swab just like a draw a whirlpool from inside to outside on the surface of lens.

CD PLAYER ADJUSTMENTS

1. ADJUSTMENTS
(1) Confirm the tracking balance
1. Turn on the POWER switch.
2. Connect an Oscilloscope to TP2 (TE) and TP4 (VC).
3. Set the test disc.
4. Press "PLAY" button to turn into the "PLAY" mode.
5. Keep holding "SKIP" button down so as to be "SERCH" mode, then confirm that the oscilloscope waveform is symmetrical on the top and bottom in relation to 0V (VC).
- 2 -
ˇ 200mV div. 5ms
CD PLAYER ADJUSTMENTS
REVERSE
NORMAL
(2) Checking the "eye" pattern
1. Switch "ON" the POWER.
2. Connect an oscilloscope to TP1 (RF) and TP4 (VC).
3. Load the test disc.
4. Press the PLAY button.
5. Check to be sure that the "eye" pattern is at the center of waveform and that the diamond shape is clearly defined.
6. Press the STOP button.
7. Turn off the POWER switch.

TAPE ADJUSTMENTS

1. Azimuth Adjustment
• Be sure to clean the heads before attempting to make any adjustment.
• Be sure both channels (1 and 2) are the same level.
(Using a dual-channel oscilloscope)
• Be sure both channel's waveform are same for the phase matching.
• After completion of the adjustment, use the threadlock (TB-1401B) to
secure the azimuth adjustment screws.
TP1 (RF)
TP4 (VC)
+
OSCILLOSCOPE
-
a
OPENING EXPANDED
b
1. Remove the cover deck as Fig.1.
2. Load a test tape (VTT-738 etc. : 10kHz) in the Deck.
3. Press the PLAY button. (Normal playback)
4. Use a + tip screwdriver to turn the screw for normal azimuth adjustment so that the left and right outputs are maximized at the same phase during normal playback. See Fig.2.
5. Press the PLAY button. (Reverse playback)
6. Use a + tip screwdriver to turn the screw for reverse azimuth adjustment so that the left and right outputs are maximized at the same phase during reverse playback.
7. Adjust so that the waveforms for the left and right channels are in alignment.
2. Tape Speed Adjustment
Fig.3
• Connect the Frequency Counter to TAPE OUT.
1. Insert the test tape (MTT-111N, etc.; 3,000Hz) into the DECK.
MOTOR
2. Press the PLAY button. .
3. Adjust a hole on the motor bottom so that a frequency counter reading of 3,000 ±5Hz is obtained.See Fig.3.
4. Press the STOP button, and eject the test tape.
3. Torque Measurement
Take-up Torque Back tention
Pulley tentionItem
Fig.1
Fig.2
hole for adjustment
Test Cassette
PLAY/REV.
F.FWD
REW
PLAY : TW2111A (FWD)
PLAY : TW2121A (REV)
F.FWD / REW : TW2231
30 ~ 65 grcm
30 ~ 65 grcm
70 ~ 140 grcm
PLAY : TW2111A (FWD)
PLAY : TW2121A (REV)
2 ~ 6 grcm
- 3 -
Driving power cassette :
TW-2412 (PLAY)
TW-2422(REV. PLAY)
>50grcm
-
70 ~140 grcm
-

TUNER ADJUSTMENTS

• Use a plastic screw driver for adjustments.
• MODE : ST (Stereo)
• Speaker impedance : 4 ohm
• TUNING FM : 87.5 - 108MHz MW: 522 - 1710kHz (9kHz step)
520 - 1710kHz (10kHz step)
Standatd Input: 60dB Antenna : 75 unbalanced , Modulation : 1 kHz
1. FM
Step Adjusting Connection SG Set Adjustment Remark
Circuit Input Output Frequency Position
1
IF(0V)
Adjustmen
2 Cover --- Connect Digital DC voltmeter to 87.5MHZ Lo w --- 1.55±0.05V
Voltage --- TP11(H), TP12(E). 108.0MHZ High --- 7.1±0.5V
98.0MHz.Input Level Alignment voltage IC231 Alignment voltage IC231 FM Antenna SG=66dBμV 3-22pin(TP24,25) is 0.0±0.05V 3-22pin is 0.0±0.05V
Dev. : ±22.5kHz(MONO)  22.5kHz(STEREO) ±6.75kHz(PILOT)
98MHz
Low XF233
SG Modulation : 1kHz, 30%
2. MW
Step Adjusting Connection SG Set Adjustment Remark
Circuit Input Output Frequency Position
1
2 Cover --- Connect Digital DC voltmeter to 522kHZ Lo w 1.00±0.05V
Voltage --- TP11(H )and TP12(E). 1710kHZ High 7.50±0.20V
3 Tracking
Connect AM SG to loop Connect Sweep generator to test 450kHz
IF Low T2002 AF Maximum
antenna
Connect AM SG to loop Connect to VTVM 603KHZ L ow L2151 loop antenna
point TP13(L)or TP14(R) and TP15(E). (at 999kHz)
point TP13(L)or TP14(R) and TP15(E).
Antenna, IRE Loop, Distance: 60 cm
L2153
AF Maximum
1404kHZ High CT252
- 4 -

WHAT TO DO IF

If the operation of the unit or display is not normal, even though the appropriate buttons have been pressed. Disconect the power cord from the AC outlet, then press "RESET" (rear of the unit) for at least 30 seconds.
OFF 220-240V 1
10-120V
VOLTAGESELECTOR

WHEN ASSEMBLING THE RACK GEAR AND CD LID

When assembling the rack gear and CD lid, "A"part should be inserted into the "B" part.

WHEN REPLACING LED (D6310)

When replacing the LED (D6310);
If the pointed pattern is shorted, remove the soldering first. Then replace LED (D6310) with new LED on the parts list.
A
B
- 5 -
FRONT P.W.BOARD

EXPLODED VIEW (CABINET & CHASSIS)

12
1
2
15
15
16
3
4
6
72
73
7
Y02
Y03
Y05
Y07
54
55
Y05
Y04
Y01
Y05
Y05
Y06
24
56
58
57
71
26
27
28
32
29
30
30
31
25
14
17
33
53
52
18
19
20
22
23
21
5
9
13
8
Y08
Y08
Y09
Y09
Y10
Y10
Y11
Y12
Y13
Y13
Y14
Y15
Y16
Y26
Y26
Y21
Y21
75
74
Y22
Y22
Y24
Y25
Y23
Y20
Y17
Y18
Y18
Y17
51
35
76
Y23
Y07
34
Y28
Y27
N.S.P
14
59
N.S.P : Not supplied as service parts.
- 6 -

PARTS LIST

PRODUCT SAFETY NOTICE
EACH PRECAUTION IN THIS MANUAL SHOULD BE FOLLOWED DURING SERVICING. COMPONENTS IDENTIFIED WITH THE IEC
!!
SYMBOL SPECIAL SIGNIFICANCE. WHEN REPLACING A COMPONENT IDENTIFIED BY OR PARTS WITH THE SAME RATINGS OF RESISTANCE, WATTAGE OR VOLTAGE THAT ARE DESIGNATED IN THE PARTS LIST IN THIS MANUAL. LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS MUST BE MADE TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE PRODUCT TO THE CUSTOMER.
CAUTION : Regular type resistors and capacitors are not listed. To know those values, refer to the schematic diagram.
!
IN THE PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATED COMPONENTS IN WHICH SAFETY CAN BE OF
!!
!
, USE ONLY THE REPLACEMENT PARTS DESIGNATED,
Regular type resistors are less than 1/4 W Carbon type and Chip type resistors. Regular type capacitors are less than 50 V and less than 1000 µF type of Ceramic type, Electrolytic type and Chip type.
PACKING & ACCESSORIES
REF.NO. PART NO. DESCRIPTION
614 316 2711 CARTON CASE 614 314 2850 CUSHION,REAR 614 314 2867 CUSHION,FRONT 614 316 2827 INSTRUCTION MANUAL 614 309 3435 NOTICE 645 041 9027 POLY SHEET-0430X0290*NC,SET 645 044 1110 REMOCON,*** 614 318 9404 LID,BATTERY,SERVICE 645 005 1227 ASSY,ANTENA,LOOP
or 645 046 8322 ASSY,ANTENA,LOOP
614 245 0055 ANTENNA 614 314 2300 ASSY,BOX,SPEAKER,SPEAKER(L) 614 318 3068 ASSY,BOX,SPEAKER,SPEAKER(R) 614 314 2317 ASSY,GRILLE
CABINET & CHASSIS
REF.NO. PART NO. DESCRIPTION
1 614 314 2409 ASSY,DOOR,DECK 2 614 314 2645 LID,CASSETTE 3 614 303 5718 KNOB,VR 4 614 314 2430 ASSY,PANEL,FRONT 5 614 314 2454 BUTTON,POWER,5KEYS 6 614 314 2478 BUTTON,PLAY,10KEYS 7 614 314 2515 BUTTON,MEMORY,6KEYS 8 614 309 7969 ASSY,GEAR,LID CASSETTE 9 614 303 5794 SPRING,DOOR DECK 12 614 303 1277 LATCH,CAM,DECK,DOOR,LOCKING 13 614 316 0359 MOUNTING,HOOK,ASSY,MECHA 14 614 304 5700 HOLDER,MAIN PCB,MAIN PCB 15 614 310 3899 SPACER,MECHA,MTG CD+DA11 16 614 307 2072 COVER,PICK-UP 17 614 314 8067 RACK,GEAR-1 18 614 318 5079 ASSY,CLUTCH 19 614 314 8043 GEAR 20 614 314 8050 MOUNTING,MOTOR 21 614 314 8036 GEAR 22 614 237 7161 PULLEY 23 614 300 8293 BELT,SQUARE 24 614 314 2669 MOUNTING,CD 25 614 309 8270 ASSY,GEAR,LID,CD 26 614 307 8821 PULLEY 27 614 303 0256 LATCH,MAGNET 28 614 314 2652 LID,CD 29 614 314 2614 DEC,WINDOW,CD 30 614 315 9254 DEC,CAP 31 614 316 1967 ASSY,CABINET,REAR 32 614 316 1172 STOPPER 33 614 318 8841 ASSY,MOTOR 34 614 269 9621 SPACER, WINDOW, CD+WINDOW 35 614 307 9804 ASSY,MECHA,CDDA11N-SASH
614 129 9136 LUG,LEAD FIX
FIXING PARTS
REF.NO. PART NO. DESCRIPTION
Y01 411 165 3803 SCR S-TPG BIN 2.3X10,F-PANEL Y02 411 021 3503 SCR S-TPG BIN 3X10,
F-PANEL+BUTTON,PLAY Y03 412 003 1708 SPECIAL SCREW,FRONT+ASSY,GEAR Y04 411 022 4608 SCR S-TPG FLT 3X8,
MECHA+MOUNTING,HOOK Y05 411 021 3503 SCR S-TPG BIN 3X10,
F-PANEL+MECHA,CAM+MECHA Y06 614 129 9136 LUG,LEAD FIX Y07 411 021 3503 SCR S-TPG BIN 3X10,
MTG CD+CD PCB Y08 411 021 1806 SCR S-TPG BIN 2.6X10,MTG CD+DA11 Y09 411 092 0906 WASHER Z 2.6X10X0.5,MTG CD+DA11 Y10 412 061 7803 SPECIAL SCREW,GEAR Y11 411 021 3503 SCR S-TPG BIN 3X10,
ASSY,MOTOR+MOUNT CD Y12 411 044 7502 SCR PAN+SW 2X5,MOTOR Y13 411 021 3503 SCR S-TPG BIN 3X10,MTG CD+F-PCB Y14 411 021 3503 SCR S-TPG BIN 3X10,
MOUNTING,CD+ASSY,GEAR Y15 411 021 4906 SCR S-TPG BIN 3X20,
F-PANEL+MTG CD Y16 411 021 3503 SCR S-TPG BIN 3X10,
SWITCH,PWB+MOUNTING CD Y17 411 021 3503 SCR S-TPG BIN 3X10,MAIN PCB Y18 411 165 3803 SCR S-TPG BIN 2.3X10,
LID CD+DEC WINDOW CD Y20 411 021 3503 SCR S-TPG BIN 3X10,REAR+STOPPER Y21 412 032 6408 SPECIAL SCREW,REAR+P-TRANS Y22 411 021 4906 SCR S-TPG BIN 3X20,C-REAR Y23 411 021 3404 SCR S-TPG BIN 3X10,
C-REAR(ANT TERMINAL) Y24 411 021 3404 SCR S-TPG BIN 3X10,MTG CD+REAR Y25 411 021 3404 SCR S-TPG BIN 3X10,C-REAR+OPT Y26 411 098 7800 SCR S-TPG FLT 3X12,
C-REAR+MTG(L/R) Y27 411 021 3503 SCR S-TPG BIN 3X10,
REAR+AC CORD PCB Y28 411 156 2105 SCR S-TPG BIN 2.3X6,LUG45
ELECTRICAL PARTS
REF.NO. PART NO. DESCRIPTION
51 52 53 54 614 316 8041 ASSY,WIRE,CD-CD MECHA 55 614 316 8072 FLEXIBLE FLAT CABLE,CD-CD MECHA 56 614 316 8027 ASSY,WIRE,AMP-TAPE MECHA 57 614 316 8065 FLEXIBLE FLAT CABLE,AMP-FR 58 614 316 8010 ASSY,WIRE,R/P HEAD-AMP 59 645 031 7637 CORE,FERRITE or 645 013 6498 CORE,FERRITE
- 7 -
!!
!
645 044 6061 POWER TRANSFORMER
!!
!
423 016 8103 FUSE 250V 4A
!!
!
645 032 1887 CORD,POWER-2.0MK
614 316 8034 ASSY,WIRE,CD-LID
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