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Service manual
DRA-395 2~34
DRA-295 36~69
For U.S.A. & Canada model
Hi-Fi AM-FM Stereo Receiver
SERVICE MANUAL
MODEL DRA-395
AM-FM STEREO RECEIVER
-- TABLE OF CONTENTS --
SAFETY PRECAUTIONS ............................................ 2 PARTS LIST OF PACKING & ACCESSORIES ........ 27
SPECIFICATIONS ....................................................... 2 WIRING DIAGRAM .................................................... 28
DISASSEMBLY ........................................................... 3 SCHEMATIC DIAGRAMS ................................... 29~34
ADJUSTMENT .......................................................... 4,5 (1/6) INPUT UNIT ........................................................... 29
BLOCK DIAGRAM ....................................................... 6 (2/6) VOLUME UNIT ....................................................... 30
LEVEL DIAGRAM ........................................................ 7 (3/6) MAIN UNIT ............................................................. 31
SEMICONDUCTORS ............................................ 8~12 (4/6) VIDEO UNIT ........................................................... 32
PRINTED WIRING BOARDS .............................. 13~17 CONNECTOR UNIT ............................................... 32
NOTE FOR PARTS LIST ........................................... 18 (5/6) FRONT UNIT .......................................................... 33
PARTS LIST OF P.W.B. UNIT ASS'Y ................. 19~24 SWITCH UNIT ........................................................ 33
EXPLODED VIEW ..................................................... 25 POWER SW/HP UNIT ............................................ 33
PARTS LIST OF EXPLODED VIEW ......................... 26 (6/6) TUNER UNIT .......................................................... 34
PACKING VIEW ........................................................ 27
Some illustrations using in this service manual are slightly different from the actual set.
14-14, AKASAKA 4-CHOME, MINATO-KU, TOKYO 107-8011 JAPAN
Telephone: 03 (3584) 8111
X0118 842 NC 0108
DRA-395
SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.
SPECIFICATIONS
Audio Section
(Power Amplifier)
Rated output: 80W + 80W (8/ohms, 20Hz ~ 20kHz with 0.08% T.H.D.)
Output terminals: A or B 4 to 16/ohms
A+B 8 to 16/ohms
(Analog)
LINE input - PRE OUT
Input sensitivity/input impedance: 200mV/47k/kohms
Frequency response: 10Hz ~ 50kHz: ±1.5dB
S/N ratio: 100 dB (IHF-A weighted)
Total harmonic distortion: 0.009% (-3dB at rated output, 8/ohms) (1kHz)
Rated output: 1.2V
PHONO input - REC OUT
Input sensitivity/input impedance: 2.5mV/47k/kohms
RIAA deviation: ±0.5dB (20Hz ~ 20kHz)
S/N ratio: 74dB (IHF-A weighted, with 5mV input)
Total harmonic distortion: 0.03% (1kHz, 3V)
Rated output/Maximum output: 150mV/7V
Video Section
(Standard Video Jacks)
Input/output level and impedance: 1V p-p, 75/ohms
Frequency response: 5Hz ~ 10MHz +1, -3dB
Tuner Section
[FM] (note: µV at 75/ohms, 0dBf = 1×10-15W) [AM]
Receiving range: 87.50MHz ~ 107.90 MHz 520kHz ~ 1710kHz
Usable sensitivity: 1.4µV (14.2dBf) 18µV
50dB quieting sensitivity: MONO 2.8µV (20.2dBf)
STEREO 23µV (38.5dBf)
S/N ratio: MONO 80dB (IHF-A weighted)
STEREO 75dB (IHF-A weighted)
Total harmonic distortion: MONO 0.15% (1kHz)
STEREO 0.3% (1kHz)
General
Power supply: AC120V, 60Hz
Power consumption: 3.39A
Maximum external dimensions: 434 (W) × 147 (H) × 417 (D) mm (17-1/16 × 5-25/32 × 16-7/16)
Weight: 9.7kg (21lbs 6oz)
Remote Control Unit (RC-894)
Batteries: R03/AAA Type (two batteries)
External dimensions: 64 (W) × 206 (H) × 19 (D) mm (2-13/64 × 8-9/32 × 3/4)
Weight: 140g (Approx. 4.9 oz) (including batteries)
* For purposes of improvement, specifications and design are subject to change without notice.
2
DRA-395
DISASSEMBLY
(Follow the procedure below in reverse order when reassembling)
Top Cover
Remove 6 screws 1 and 3 screws 2 , detach the Top Cover
Top Cover
in the arrow direction.
1
2
1
Front Panel
1. Remove 4 screws 3 and 2 screws 4 .
2. Detach the Front Panel in the arrow direction.
4
Front Panel
3
Rear Panel
1. Remove cord bushing 5 from the Rear Panel.
2. Remove 26 screws 6 .
5
3. Detach the Rear Panel in the arrow direction.
Rear Panel
6
6
6
3
DRA-395
ADJUSTMENT
Tuner Section
CONNECTION DIAGRAM OF MEASURING INSTRUMENTS
FM
T402 T403
R471 STEREO
MODULATOR
IC402
75ohm FM SSG
VR402
Digital
Voltmeter
TUNER B'D
FM ALIGNMENT
Tuning Input Output Adjustment
Alignment
Step Frequency Input
Item Type Frequency Modulation Coupling Type Connect to Points Adjust to
Setting Level
Center 98.1MHz Mono Antenna Digital
1 FM SSG 98.1MHz 60dBµ R471 T402 ± 50mV
Adjustment (98.0MHz) 1kHz 100% Terminal Voltmeter
98.1MHz Mono Antenna Distortion Output Minimum
2 Distortion FM SSG 98.1MHz 60dBµ T403
(98.0MHz) 1kHz 100% Terminal Meter Terminal (L) Distortion
3 Repeat Steps 1 and 2
98.1MHz Antenna Light "TUNED" on
4 Signal Level
(98.0MHz)
FM SSG 98.1MHz 20dBµ OFF
Terminal FL Display
VR402 20 +14 dB
-10
AM
T402 T403
R471
IC402
VR401
TUNER B'D
AM ALIGNMENT
Alignment Output Adjustment
Step Frequency Input Remarks
Item Type Connect to Points Adjust to
999 (1000) Light "TUNED" on SSG OUTPUT
1 Signal Level AM SSG VR401
kHz FL Display 74dBµ (EMF)
4
DRA-395
Audio Section
Idling Current
Required measurement equipment : DC Voltmeter
Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room tempereture
15 °C ~ 30 °C (59 °F ~ 86 °F).
(2) Presetting
G POWER (Power sourse switch) OFF
G SPEAKER (Speaker terminal) No load (Do not connect speaker, dummy resistor, etc.)
Adjustment
(1) Remove top cover and set VR101, VR102 on Amp. Unit at full counterclockwise ( ) position.
(2) Connect DC Voltmeter to test points (Lch: TP101, Rch: TP102).
(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting. MASTER VOLUME : "---" counterclockwise ( min.)
FUNCTION : CD
(5) Within 2 minutes after the power on, turn VR101 clockwise ( ) to adjust the TEST POINT voltage to 1.5 mV ±0.5 mV
DC.
(6) After 10 minutes from the preset above, turn VR101 to set the voltage to 2.5 mV ±0.5 mV DC.
(7) Adjust the Variable Resistors of other channels in the same way.
VR101
Lch
TP101
VR102
Rch
TP102
5
DRA-395
BLOCK DIAGRAM
1 2 3 4 5 6 7 8
A
B
C
D
E
6
DRA-395
LEVEL DIAGRAM
1 2 3 4 5 6 7 8
INPUT
BUFFER
AMP
MAIN VOL POWER AMP
A
3 4
CD 1
1 5 4
2 8 7 1
SPK OUT
6 8
1
ATT H/P OUT
1
1
MUTE
5 4
7
6 8
5 4 B
1
6 8
7
ATT 1
MULTI OUT
1
MAIN SPK OUT
2.83V
(1W/8ohms)
+27dB
CD IN
(200mV) C
-18dB +15.5dB -35.5dB H/P OUT
47mV
(1W/8ohms)
VOL 00
D
MULTI ROOM
+16.2dB MULTI ROOM OUT
(200mV) 1.2V
E
7
DRA-395
SEMICONDUCTORS Pin
Pin Name I/O Function
No.
IC's 46 SPEAKER B LED 2 O SPEAKER B LED indicator control
CXP82840-319Q (IC900) 47 STBY LED 3 O STANDBY LED indicator control
80 51 48 PD2/A53 O FL P38
49 PD3/A52 O FL P37
81 50 50 PD4/A51 O FL P36
51 PD5/A50 O FL P01
52 PD6/A49 O FL P02
53 PD7/A48 O FL P03
54 PF0/A47 O FL P04
55 PF1/A46 O FL P05
56 PF2/A45 O FL P06
57 PF3/A44 O FL P07
58 PF4/A43 O FL P08
100 31 59 PF5/A42 O FL P09
60 PF6/A41 O FL P10
1 30
61 PF7/A40 O FL P11
62 PG0/A39 O FL P12
63 PG1/A38 O FL P13
CXP82840-319Q Terminal Function 64 PG2/A37 O FL P14
65 PG3/A36 O FL P15
Pin 66 PG4/A35 O FL P16
Pin Name I/O Function
No. 67 PG5/A34 O FL P17
1 G2/A1 O FL G02 68 PG6/A33 O FL P18
2 G1/A0 O FL G01 69 PG7/A32 O FL P19
3 NC(Vdd) I NC(Connect to Vdd) 70 PH0/A31 O FL P20
4 POWER DOWN I AC OFF Detect 71 PH1/A30 O FL P21
5 ENC VOLUME UP I Encoder VOLUME UP 72 PH2/A29 O FL P22
6 RDS CLOCK I RDS clock input(TDA7330) 73 PH3/A28 O FL P23
7 ENC VOLUME DOWN I Encoder VOLUME DOWN 74 PH4/A27 O FL P24
8 REMOCON I Remote signal input. 75 PH5/A26 O FL P25
9 PROTECTION I Protection detecting input. 76 PH6/A25 O FL P26
10 SUB ZONE2 LED O ZONE3 LED indicator control 77 PH7/A24 O FL P27
11 SUB ZONE1 LED O ZONE2 LED indicator control 78 A23 O FL P28
12 62446 LATCH O Electronic volume control.(M62446 LATCH) 79 A22 O FL P29
13 FUNCTION SW 1 CE O Function IC control.(TC9274 CE) 80 A21 O FL P30
14 FUNCTION 1/2 DATA O Function IC control.(TC9274 DATA) 81 A20 O FL P31
15 FUNCTION 1/2 CLOCK O Function IC control.(TC9274 CLOCK) 82 A19 O FL P32
16 VOLUME,PLL,4094,DATA O LC72131,M62446,KIC9459,TC9184,TC4094(DATA) 83 A18 O FL P33
17 VOLUME,PLL,4094,CLOCK O LC72131,M62446,KIC9459,TC9184,TC4094(CLOCK) 84 A17 O FL P34
18 TUNED I TUNED signal in. 85 A16 O FL P35
19 STEREO I STEREO signal in. 86 G16 O FL G16
20 IF COUNT I PLL data in.(LC72131) 87 G15 O FL G15
21 TUNER MUTE O Tuner mute output. 88 G14 O FL G14
22 PLL CE O LC72131(CE) 89 Vdd I Vcc SUPPLY.
23 4094 STB O TC4094(STB) 90 G13 O FL G13
24 VOLUME STB O KIC9459,TC9184(STB) 91 G12 O FL G12
25 SUB 1 MUTE O ZONE2 mute control. 92 G11 O FL G11
26 MAIN MUTE O MAIN,Subwoofer mute output. 93 G10 O FL G10
27 POWER RELAY O Power supply relaycontrol. 94 G9 O FL G09
28 AV REF. I Reference voltage input for A/D converter. 95 G8 O FL G08
29 1511 DATA O Not used. 96 G7 O FL G07
30 RDS DATA I Not used. 97 G6 O FL G06
31 KEY IN 1 I Key input 1 98 G5 O FL G05
32 KEY IN 2 I Key input 2 99 G4 O FL G04
33 KEY IN 3 I Key input 3 100 G3 O FL G03
34 STEP OPTION I Area select.
35 SET OPTION I Model select.
36 SPEAKER A LED 1 O SPEAKER A LED indicator control
37 A VSS I A/D converter GND.
38 RESET I Low-level active,system reset.
39 EXTAL I EXTAL(10MHz)
40 XTAL O XTAL(10MHz)
41 VSS I GND
42 NC(TX) O Not used.
43 G(TEX) I GND
44 VDD I Vcc SUPPLY.
45 VFDP I FDP voltage supply.
8
DRA-395
LC72131M (IC401) LA1266 (IC402)
AM-IF FM-IF FM-IN
1 24 20 18 11 13 10 1 2 3 5 6 7
XI N 1 20 XOUT V cc
2 23
IF IF POST
3 22 FM - IF Q.D. AMP 12
BUFFER BUFFER
CE 2 19 V ss
4 21
5 20 9
DI 3 18 AOUT
6 19
AM - I N 21 RF MIX AM-IF DET 15
7 18
CL 4 17 AI N
8 17
9 16 REG OSC OSC NARROW
AGC S-METER
LED
8
DO 5 16 PD BUFFER S-METER DRIVER
10 15
11 14 GND
BO1 6 15 V DD
12 13 22 23 24 4 14 19 17 16
BO2 7 14 F MI N
BO3 8 13 AMI N
LA3401 (IC403)
BO4 9 12 I O2
22 21 20 19 18 17 16 15 14 13 12
I O1 10 11 I F I N
VOL PHASE
OSC PILOT DET LAMP
REG COMPARATOR
DRIVER
VCO STOP
SYMMETRICAL TRIGGER
REOCTANCE
CIRCUIT
STEREO
FF SWITCH
FF FF
FF FF
38kHz 38kHz 90° 19kHz 90°
MUTING CONTROL MUTING
DECODER
FM AM CHANGE OVER OUTPUT
Ro Rc Rb Rb
MUTING
FM AM CHANGE Vcc ON
MUTING
Rc
1 2 3 4 5 6 7 8 9 10 11
TC9184AP (IC602)
DATA
GND
STB
VDD
VSS
CK
1 16 7 8 9 10
Vss 1 16 VDD
13 bit latch circuit
BASS+ 2 Level shift 15 BASS+
Ladder resister
Ladder resister
Analog switch
Analog switch
BASS+ 2 15 BASS+
BASS- 3 14 BASS-
20 bit Shift register circuit
CON 4 13 COM
TREBLE- 5 12 TREBLE- BASS- 3 14 BASS-
TREBLE+ 6 11 TREBLE+
COM 4 13 COM
GND 7 10 STB
CK 8 9 DATA
13 bit latch circuit
TREBLE- 5 12 TREBLE-
Ladder resister
Ladder resister
Analog switch
Analog switch
Code
TREBLE+ 6 detect 11 TREBLE+
circuit
BA7625 (IC501)
Monitor OUT 1
A B E MONITOR OUT C D E V OUT 1 C D E V OUT 2
16 IN1
GND 2 6dB 15 CTL A L L * IN 1 L L * ¾ L L * IN 1
IN5 3 LOGIC 14 V OUT1 H L * IN 2 H L * IN 2 H L * ¾
GND 4 13 Vcc L H IN 3 L H IN 3 L H * IN 3
* *
IN4 5 12 IN2 H H L IN 4 H H L IN 4
H H L IN 4
6dB
CTL E 6 11 CTL B
H H H IN 5 H H H IN 5 H H H IN 5
IN3 7 LOGIC 10 V OUT2
Note 1: * mark means that feasible for either H or L.
CTL D 8 9 CTL C
Note 2: Each input terminal is provided with sink chip clamp (BA7625).
Each input terminal takes 20kohm at the end (BA7626).
9
DRA-395
TC9274N-008 (IC303) KIA7805AP (IC103) NJM7915FA (IC102)
NJM7805FA (IC104)
1 VSS VDD 42
2 S1 S1 41
KIA7815AP (IC101)
3 S2 S2
S1 40
4 S3 S3 39 FRONT FRONT
5 S4 S4
S1 38 VIEW VIEW
6 S5 S5
S1 37
7 S6 S6
S1 36
Input
GND
Output
Input
Output
GND
8 S7 S7 35
9 S8 S8 34
42
10 S9 S9
S1 33
42
11 S10 S10 32
42
PC74HC4094 (IC604) KIC9459F (IC601)
12 S11 S11 31
42
13 S12 S12 30
42
Vss 1 24 VDD
14 S13 S13 29
42
L-OUT 2 23 R-OUT
15 S14 S14 28
42
STR 1 16 VCC NC 3 22 NC
16 S15 S15 27
42
D 2 15 OE
L-IN 4 21 R-IN
17 S16 S16 26
42 CP 3 14 QP4 L-ch R-ch
18 S17 S17 42
25 QP0 4 13 QP5 L-LD1 5 20 R-LD1
QP1 5 12 QP6 L-LD2 6 19 R-LD2
19 S18 S18 24
42
QP2 6 11 QP7
L.A.GND 7 18 R.A.GND
20 GND STB 23
42 QP3 7 10 QS2
21 CK DATA 42
22 GND 8 9 QS1 NC 8 17 NC
CS1 9 16 CS2
NC 10 15 NC
M62446FP (IC603)
GND 11 14 STB
CK 12 13 DATA
OUT4 1 42 DVDD
OUT3 2 OUTPUT 41 CLK
OUT2 3 PORT volume MCU
I/F
40 DATA
OUT1 4 39 LATCH
CXA1511M(IC502)
AV DD 5 38 DGND
volume Head Limiter BPF Detector & Integrator Hysteresis
SWin 6 37 AGND Amp Amp BEF Comparator Comparator
GNDS 7 36 SW OUT IN 1 8 VCC
SRin 8 volume 35 SROUT C1 2 7 OUT I N 1 +
C2 3 6 NC
SLin 9 34 SLOUT
GND 4 5 fo ABLC
GNDC 10 33 COUT
Cin 11 volume 32 ROUT
2 3 4 5 6 7 8
DNDR 12 31 LOUT
C1 C2 GNDfo NC OUT Vcc
Rin 13 volume 30 AV SS
GNDL 14 29 CL1
Lin 15 28 CL2
BYPASSR 16 27 CR1
volume
BLPASSL 17 26 CR2 NJM2068DD (IC300 302, 605 610)
LTRE 18 25 RTRE
19 tone tone 24
LBASS3 RBASS3
LBASS2 20 23 RBASS2
21 22 A OUTPUT 1 8 V
LBASS1 RBASS1
A INPUT 2 7 B OUTPUT
A+INPUT 3 6 B INPUT
5 B +INPUT
V
4
IC PROTECTOR POSISTOR
ICP-N15 (IC105) P43T7D330BW16
FRONT VIEW FRONT VIEW
IR SENSOR
NJL64H380A(RMC900)
FRONT VIEW
Vcc
Head Amp Amp Limiter Comparator 22kohm
VOUT
B.P.F Detector
PD
ABLC GND
Vout
GND
Vcc
10
DRA-395
TRANSISTORS
DTA114EK
DTA114YK DTA series DTC series
DTC114YK C C
R1 R1
B B B
TOP
VIEW C R2 R2
E
E E
DTA114ES R1 R2 R1 R2
DTA144ES DTA114EK 10kohm 10kohm DTC114ES 10kohm 10kohm
DTC114ES DTA114ES 10kohm 10kohm DTC114YK 10kohm 47kohm
DTA114YK 10kohm 47kohm DTC114YS 10kohm 47kohm
DTC114YS
DTA114ES 47kohm 47kohm DTC144ES 47kohm 47kohm
DTC144ES
FRONT
VIEW KTC3880S 2SD947F 2SB1560
KTA1266Y 2SD2390
KSA992F
E C B
KSC1845F
KTC3200BL
B
TOP
KTC3198Y
VIEW C KTA1268BL FRONT
FRONT
E KSA916Y VIEW VIEW
2SC1740S
KTC2874B
E C B B C E
DIODES (LED Included)
MTZJ3.3B 1N4007 KDS160 HL-50RDRF4
MTZJ5.1B 1SS133
MTZJ5.6B TOP VIEW
MTZJ6.2B
MTZJ6.8B
TOP VIEW
MTZJ7.5A
MTZJ7.5B
MTZJ18B
MTZJ20B
KBPC604
11
DRA-395
FL DISPLAY
16-st-42GNK (FL900)
1 58
G1
TUNED STEREO REC PHONO CD TUNER AUX DVD / VDP TV / DBS
RDS AUTO MULTI VCR - 1 - 2 - 3 V.AUX MD / TAPE - 1 - 2 S9 S1
PRO LOGIC S14 S10 S6 S2
DIGITAL S38 S15 S7
CH DIGITAL ANALOG
S13 S11 S5 S3
S12 S4
F1 F2
G2~G16
S1 S2 S3 S4 S5
S6 S7 S8 S9 S10
G7 G1 S11 S12 S13 S14 S15
G16 G15 G13 G12 G10 G9 G6 G5 G4 G3 G2
TUNED S