This service manual consists of "DC-DA370U" (Main unit : 129 598 06) and "SX-DA370L"
(Speaker system : 165 027 00) & "SX-DA370R" (Speaker system : 165 040 00).
IC block diagram & description ........................................ 11
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 -
Page 3
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.
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 -
ˇ200mV
div. 5ms
Page 4
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.
Connect AM SG to loop Connect Sweep generator to test 450kHz
IFLowT2002AF Maximum
antenna
Connect AM SG to loopConnect to VTVM603KHZL owL2151
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
1404kHZHighCT252
- 4 -
Page 6
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
Page 7
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 -
Page 8
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.
MTG CD+CD PCB
Y08411 021 1806 SCR S-TPG BIN 2.6X10,MTG CD+DA11
Y09411 092 0906 WASHER Z 2.6X10X0.5,MTG CD+DA11
Y10412 061 7803 SPECIAL SCREW,GEAR
Y11411 021 3503 SCR S-TPG BIN 3X10,
ASSY,MOTOR+MOUNT CD
Y12411 044 7502 SCR PAN+SW 2X5,MOTOR
Y13411 021 3503 SCR S-TPG BIN 3X10,MTG CD+F-PCB
Y14411 021 3503 SCR S-TPG BIN 3X10,
MOUNTING,CD+ASSY,GEAR
Y15411 021 4906 SCR S-TPG BIN 3X20,
F-PANEL+MTG CD
Y16411 021 3503 SCR S-TPG BIN 3X10,
SWITCH,PWB+MOUNTING CD
Y17411 021 3503 SCR S-TPG BIN 3X10,MAIN PCB
Y18411 165 3803 SCR S-TPG BIN 2.3X10,
LID CD+DEC WINDOW CD
Y20411 021 3503 SCR S-TPG BIN 3X10,REAR+STOPPER
Y21412 032 6408 SPECIAL SCREW,REAR+P-TRANS
Y22411 021 4906 SCR S-TPG BIN 3X20,C-REAR
Y23411 021 3404 SCR S-TPG BIN 3X10,
IC443 BA7755A (Head Switch)IC440 AN7348K ( Play/Rec Pre Amp)
L-REC OUT
17
Rec
Amp(L)
Rec
Amp(R)
Logic
Rec/PB
8
R-REC OUT
ALC
16
P
P
R
R
P
9
REC/PB SW
HI/LO
15
R
Nor/Cro
& Hi/Lo
Logic
101211
A/B SW
A/Rec
L-PB AMP
B
A/Rec
1
L-PB AMP
R-PB AMP
B
2
R-PB AMP
L-PB NF
PB Amp(L)
PB Amp(R)
3
R-PB NF
L-PB EO
21222324
Mute
Mute
4
R-PB EO
L-PB
AMP OUT
20
576
R-PB OUT
ALC
Logic
A/B
ALC
AB SW
L-REC IN
1819
R-REC IN
IC445 MM1453XF (Q Xpander with Spread Control)
CC
V
L
REF
IN
V
171816
QF2QF3QF4QF5QF6QF1
151413121110
CRO/NOR
Ripple
Rejection
FILTER
VCC
1314
GND
1
VCC
HEAD
SWITCH
GND
4
CTRL2
523
CTRL1
IC442 TDA7269 ( Stereo Amplifier)
Bias
18
R
IN
PNRS/QDETQ
34567
2
IC231 LA1844ML ( Tuner System)
242322212019181716151413
ALC
BUFF
LEVEL
DET
FM
IF
VIRTUAL AUDIO
QXpander
PROCESSOR
IN
SPC R
AM
OSC
S-CURVE
FM
DET
AM
MIX
REG
AM/FM
IF
BUFF
AM
RF.AMP
OUTLOUT
AGC
IF
COMP
TUNING
DRIVE
GND
AM
DET
AM
9
GND
P-DET
ø
304kHz
DECODER
ANTI-BIRDIE
VCO
VCC
STEREO
SW
FF
38k
FF
19k
2
PILOT
CANCEL
FF
19k
PILOT
DET
1
23456789101112
- 12 -
Page 14
IC BLOCK DIAGRAM & DESCRIPTION
IC102 LC78622NE (Digital Signal Processor)
No.Pin NameI/ OFunction
1DEFIIInput terminal for detect signal of defect
2TAIIInput terminal for test.
3PDOO The phase comparison output terminal for
external VCO control.
4VVSS-Ground terminal for built-in VCO
5ISETIResistance connection terminal for
electric current adjustment of PDO output.
6VVDD-Built-in VCO power supply terminal.
7FRIVCO frequency range adjustment.
8VSS-Ground for Digital
9EFMOO EFM signal output terminal for slice level control.
10EFMINIEFM signal input terminal for slice level control.
11TEST2ITEST pin. Normal time is non connection.
12CLV+O Output terminal for Disc motor control.
13CLV-O Output terminal for Disc motor control.
14V/PO Change of rough servo / phase control
Rough servo : "H", Phase control : "L"
15HFLIInput terminal of track search signal.
16TESIInput terminal of tracking error signal.
17TOFFO Output terminal of tracking off.
18TGLO Output terminal for change of tracking gain.
19JP+O Output terminal for tracking jump control.
20JP-O Output terminal for tracking jump control.
21PCKO Clock monitor output terminal for EFM data
playback. (4.3218 MHz)
22FSEQO Output terminal for detect of SYNC signal.
23DVDD-+5V
24CONT1I/O
25CONT2I/O This output can control at serial control from
26CONT3I/O micro processor.
27CONT4I/O
28CONT5I/O
29EMPHO Output terminal of de-emphasis monitor .
"H" : de-emphasis
30C2FO Output terminal of C2 flag
31DOUTO Output terminal of digital out
No.Pin NameI/OFunction
32TEST3ITest pin.
33TEST4ITest pin.
34NC- Non connection.
35MUTELO Mute output terminal for L-ch
36LVDD-Power supply for L-ch
37LCHOO Output terminal for L-ch
38LVSS-GND for L-ch
39RVSS-GND for R-ch
40RCHOO Output terminal for R-ch
41RVDD- Power supply for R-ch
42MUTERO Mute output terminal for R-ch
43XVDD-Power supply of crystal oscillation
44XOUTO Connection terminal of crystal oscillation (16.9344MHz)
45XINIConnection terminal of crystal oscillation (16.9344MHz)
46XVSS-GND of crystal oscillation
47SBSYO Output terminal for synchronizing signal of
sub-cord block
48EFLGO Output terminal for correction monitor of C1, C2,
Single and Double
49PWO Output terminal for sub-cord of P, Q, R, S, T, U and W
50SFSYO O utput terminal for synchronizing signal of
sub-cord frame
51SBCKIInput terminal for readout clock of sub-cord
52FSXO Output terminal of Synchronizing signal (7.35kHz)
53WRQO Output terminal for standby of sub-cord Q output
54RWCIInput terminal of read / write control
55SQOUTO Output terminal of sub-cord Q
56COINIInput terminal of command from micro processor
57CQCKIClock input for reading sub-cord from SQOUT
58RESIReset (turn on : L)
59TST11O Test pin
6016MO 16.9344MHz
614.2MO 4.2336MHz
62TEST5ITest pin
63CSIChip select terminal
64TEST1ITest pin
Key1
Key2
Open SW
Close SW
LIMIT_SW
C2F
M-Media
WRQ
RDS_IN
IR
V CHK
G_REVS
G_FWD
PACK
TAPE_INI
REEL
Tape Play PL
Motor
BEAT
R Mute
OSC
SURROUND
I/OFunction
O AMBER_LED Output
O DSP Reset Signal
O CD_DSPInterface(command+data Output)
I CD_DSPInterface(SubQ dataInput)
O CD_DSPInterface(Clock)
O Processor Power Check (GND) Control
Output
O Shift Control for Micon Oscillatrion
Frequency
O CD_DSP Interface(Command latch Output)
I Jog Dial +
I Jog Dial -
I DRF Signal Input
Reset Switch
Gnd
Power Supply Terminal
A/D Key In
A/D Key In
I Top Lid Open Sens. Switch
I Top Lid Close Sens. Switch
I Limit Switch
I DSP C2F Input
I Multi Media Input
I CD DSP Interface (SubQ Request)
I Serial Data for RDS IC Input
I Remotecontrol Input
I Power failure Detect/Processor Power
Check Input
I Miss Recording SW(tapeAB side)Input
I Miss Recording SW(tapeB side)Input
I Tape Park Check Input
I Tape Deck Initialize
I Real Rotating signal Input
O Tape Play Plunger Output
O Tape Motor Output
O Beat Cancel Control
O Tape Recording Mute
O Tape Oscillation ON/OFF Control
O Surround Output
O LCD COM 1 (LCD Panel Pin1)
O LCD COM 2 (LCD Panel Pin2)
O LCD COM 3 (LCD Panel Pin3)
O LCD COM 4 (LCD Panel Pin4)
O Serial Clock Output for Tuner/Volume FUNC IC
O Serial Data Output for Tuner IC
Gnd
Power Supply Terminal
O Serial Data Output for VOL_FUNC IC
O Serial Data Output for VOL_FUNC IC
O Serial Latch Output for TU IC
ISerial Data Input for TU IC
O Top Lid Motor Control Output +
O Top Lid Motor Control Output O Power Control
O Pre Amp Mute Output
O Power Amp Mute
O Blue LED Output
Each precaution in this manual should
be followed during servicing.
Components identified with the IEC
!!
!
symbol
schematic diagram designated
components in which safety can be
of special significance. When
replacing a component identified by
!!
!
designated, or parts with the same
ratings of resistance, wattage or
voltage that are designated in the
parts list in this manual. Leakagecurrent 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.
in the parts list and the
, use only the replacement parts
This is a basic schematic diagram.
- 17 -- 16 -
Page 18
SCHEMATIC DIAGRAM (FRONT)
PRODUCT SAFETY NOTICE
Each precaution in this manual should be followed during servicing.
Components identified with the IEC symbol
schematic diagram designated components in which safety can be of
special significance. When replacing a component identified by
only the replacement parts designated, 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.
!!
!
in the parts list and the
!!
!
, use
This is a basic schematic diagram.
- 19 -- 18 -
Page 19
SCHEMATIC DIAGRAM (AMPLIFIER)
This is a basic schematic diagram.
PRODUCT SAFETY NOTICE
!!
Each precaution in this manual should be followed during servicing. Components identified with the IEC symbol
designated components in which safety can be of 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.
!
in the parts list and the schematic diagram
, use only the replacement parts designated,
!!
!
- 25 -- 24 -
Page 20
SCHEMATIC DIAGRAM (TUNER)
This is a basic schematic diagram.
- 27 -- 26 -
Page 21
WIRING DIAGRAM(PRIMARY+ SECONDARY POWER TRANSFORMER AND CD LID SWITCH)