Denon DRA-29*5 Manuel utilisateur

Hi-Fi AM-FM Stereo Receiver

SERVICE MANUAL

MODEL

DRA-295

AM-FM STEREO RECEIVER

SAFETY PRECAUTIONS.......................................... 36

SPECIFICATIONS ..................................................... 36

DISASSEMBLY ......................................................... 37

ADJUSTMENT...................................................... 38,39

BLOCK DIAGRAM ..................................................... 40

LEVEL DIAGRAM ...................................................... 41

SEMICONDUCTORS ..........................................42~46

PRINTED WIRING BOARDS ..............................47~51

NOTE FOR PARTS LIST........................................... 52

PARTS LIST OF P.W.B. UNIT ASS'Y ................. 53~59

EXPLODED VIEW ..................................................... 60

PARTS LIST OF EXPLODED VIEW .................... 61,62

PACKING VIEW ........................................................ 63

— TABLE OF CONTENTS —

Some illustrations using in this service manual are slightly different from the actual set.

PARTS LIST OF PACKING & ACCESSORIES ........ 63

WIRING DIAGRAM.................................................... 64

SCHEMATIC DIAGRAMS ...................................65~69

(1/5) INPUT UNIT ........................................................... 65

VIDEO UNIT ........................................................... 65

(2/5) VOLUME UNIT ....................................................... 66

CONNECTOR UNIT ............................................... 66

(3/5) MAIN UNIT ............................................................. 67

(4/5) FRONT UNIT.......................................................... 68

SWITCH UNIT ........................................................ 68

POWER SW/HP UNIT............................................ 68

(5/5) TUNER UNIT.......................................................... 69

For U.S.A., Canada

& Europe model

14-14, AKASAKA 4-CHOME, MINATO-KU, TOKYO 107-8011 JAPAN

Telephone: 03 (3584) 8111

X0118 842 NC 0108

DRA-295

SPECIFICATIONS



Audio Section

(Power Amplifier)

Rated output: 50W + 50W (8Ω/ohms, 20Hz ~ 20kHz with 0.08%T.H.D.)

Output terminals: A or B 4 to 16Ω/ohms

A + B 8 to 16Ω/ohms

(Analog)

LINE input - PRE OUT

Input sensitivity/input impedance: 200mV/47kΩ/kohms

Frequency response: 10Hz ~ 50kHz: ±1.5dB

S/N ratio: 98 dB (IHF-A weighted)

Total harmonic distortion: 0.009% (−3dB at rated output, 8Ω/ohms) (1kHz)

Rated output: 1.2V



Video Section (U.S.A. & Canada model)

(StandardVideo Jacks)

Input/output level and impedance: 1V p-p, 75Ω/ohms

Frequency response: 5Hz ~ 10MHz +1, −3dB



Tuner Section [FM] (note: µV at 75Ω/ohms, 0dBf = 1×10-15W) [AM]

Receiving range:

U.S.A. & Canada model 87.50MHz ~ 107.90MHz 520kHz ~ 1710kHz

Europe model 87.50MHz ~ 108.00MHz 522kHz ~ 1611kHz

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 (For U.S.A. & Canada model)

AC230V, 50Hz (For Europe model)

Power consumption: 3.0A (For U.S.A.& Canada model)

150W (For Europe model)

Maximum external dimensions: 434 (W) ×147 (H) ×417 (D) mm (17-3/32″×5-25/32″×16-27/64″)

Weight: 9.2kg (20lbs 4.5oz)



Remote Control Unit RC-895 (For U.S.A.& Canada model)

RC-907 (For Europe model)

Batteries: R06P/AA Type (two batteries)

External dimensions: 50 (W) ×179 (H) ×22 (D) mm (1-31/32″×7-3/64″×55/64″)

Weight: 125g (Approx.7.5 oz) (including batteries)

* For purposes of improvement, specifications and design are subject to change without notice.

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.

DRA-295

Europe model

1. Remove cord bushing 5from the Rear Panel.

2. Remove 17 screws 6.

3. Detach the Rear Panel in the arrow direction.

DISASSEMBLY

(Follow the procedure below in reverse order when reassembling)

Front Panel

1. Remove 4 screws 3and 2 screws 4.

2. Detach the Front Panel in the arrow direction.

Rear Panel

U.S.A. & Canada model

1. Remove cord bushing 5from the Rear Panel.

2. Remove 23 screws 6.

3. Detach the Rear Panel in the arrow direction.

Top Cover

Front Panel

Rear Panel

Top Cover

Remove 6 screws 1and 3 screws 2, detach the Top Cover

in the arrow direction.

DRA-295

FM ALIGNMENT Input Output Adjustment

Step Alignment

Item

Tuning

Frequency

Setting Type Frequency Input

Level Modulation Coupling Type Connect to Points Adjust to

1Center

Adjustment 98.1MHz

(98.0MHz) FM SSG 98.1MHz 60dBµMono

1kHz 100% Antenna

Terminal Digital

Voltmeter R471 T402 ±50mV

2 Distortion 98.1MHz

(98.0MHz) FM SSG 98.1MHz 60dBµMono

1kHz 100% Antenna

Terminal Distortion

Meter Output

Terminal (L) T403 Minimum

Distortion

3 Repeat Steps 1 and 2

4 Signal Level 98.1MHz

(98.0MHz) FM SSG 98.1MHz 20dBµOFF Antenna

Terminal Light “TUNED” on

FL Display VR402

ADJUSTMENT

Tuner Section

CONNECTION DIAGRAM OF MEASURING INSTRUMENTS



FM

STEREO

MODULATOR

FM SSG

Digital

Voltmeter

75ohm

T402T403

IC402

VR402

TUNER B'D

R471

20+14

−10 dB



AM

T402T403

IC402

TUNER B’D

R471

VR401

AM ALIGNMENT Output Adjustment

Step Alignment

Item Frequency Input Type Connect to Points Adjust to Remarks

1 Signal Level 999 (1000)

kHz AM SSG VR401 Light “TUNED”on

FL Display SSG OUTPUT

74dBµ(EMF)

DRA-295

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

●POWER (Power sourse switch) →OFF

●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

TP101

VR102

TP102

Lch

Rch

DRA-295

BLOCK DIAGRAM

INPUT

BUFFER

AMP

MAIN VOL POWER AMP

MUTE ATT 1

MAIN

CD IN

SUB ROOM

(200mV)

-18dB -35.5dB

VOL 00

+15.5dB

26dB

+16.2dB

SPK OUT

2.83V

(1W/8ohms)

H/P OUT

47mV

(1W/8ohms)

SUB ROOM OUT

1.2V

SPK OUT

H/P OUT

SUB OUT

DRA-295

LEVEL DIAGRAM

130

5180

100

CXP82840-321Q Terminal Function

SEMICONDUCTORS



IC’s

CXP82840-321Q (IC900)

1 G2/A1 O FL G02

2 G1/A0 O FL G01

3 NC(Vdd) I NC(Connect to Vdd)

4 POWER DOWN I AC OFF Detect

5 ENC VOLUME UP I Encoder VOLUME UP

6 RDS CLOCK I RDS clock input(TDA7330)

7 ENC VOLUME DOWN I Encoder VOLUME DOWN

8 REMOCON I Remote signal input.

9 PROTECTION I Protection detecting input.

10 SUB ZONE2 LED O Not used.

11 SUB ZONE1 LED O Not used.

12 62446 LATCH O Electronic volume control.(M62446 LATCH)

13 FUNCTION SW 1 CE O Function IC control.(TC9273 ST)

14 FUNCTION 1/2 DATA O Function IC control.(TC9273 DATA)

15 FUNCTION 1/2 CLOCK O Function IC control.(TC9273 CLOCK)

16 VOLUME,PLL,4094,DATA O LC72131,M62446,TC4094(DATA)

17 VOLUME,PLL,4094,CLOCK O LC72131,M62446,TC4094(CLOCK)

18 TUNED I TUNED signal in.

19 STEREO I STEREO signal in.

20 IF COUNT I PLL data in.(LC72131)

21 TUNER MUTE O Tuner mute output.

22 PLL CE O LC72131(CE)

23 4094 STB O TC4094(STB)

24 VOLUME STB O Not used.

25 SUB 1 MUTE O Not used.

26 MAIN MUTE O MAIN,Subwoofer mute output.

27 POWER RELAY O Power supply relaycontrol.

28 AV REF. I Reference voltage input for A/D converter.

29 1511 DATA O Not used.

30 RDS DATA I RDS data input(TDA7330)

31 KEY IN 1 I Key input 1

32 KEY IN 2 I Key input 2

33 KEY IN 3 I Key input 3

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.

No. Pin Name FunctionI/O

46 SPEAKER B LED 2 O SPEAKER B LED indicator control

47 STBY LED 3 O STANDBY LED indicator control

48 PD2/A53 O FL P38

49 PD3/A52 O FL P37

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

59 PF5/A42 O FL P09

60 PF6/A41 O FL P10

61 PF7/A40 O FL P11

62 PG0/A39 O FL P12

63 PG1/A38 O FL P13

64 PG2/A37 O FL P14

65 PG3/A36 O FL P15

66 PG4/A35 O FL P16

67 PG5/A34 O FL P17

68 PG6/A33 O FL P18

69 PG7/A32 O FL P19

70 PH0/A31 O FL P20

71 PH1/A30 O FL P21

72 PH2/A29 O FL P22

73 PH3/A28 O FL P23

74 PH4/A27 O FL P24

75 PH5/A26 O FL P25

76 PH6/A25 O FL P26

77 PH7/A24 O FL P27

78 A23 O FL P28

79 A22 O FL P29

80 A21 O FL P30

81 A20 O FL P31

82 A19 O FL P32

83 A18 O FL P33

84 A17 O FL P34

85 A16 O FL P35

86 G16 O FL G16

87 G15 O FL G15

88 G14 O FL G14

89 Vdd I Vcc SUPPLY.

90 G13 O FL G13

91 G12 O FL G12

92 G11 O FL G11

93 G10 O FL G10

94 G9 O FL G09

95 G8 O FL G08

96 G7 O FL G07

97 G6 O FL G06

98 G5 O FL G05

99 G4 O FL G04

100 G3 O FL G03

DRA-295

1CXP82840.p65 01/08/18, 10:43Page 42-43 AdobePageMaker6.5J/Win

DRA-295

LA1266 (IC402)

GND

Vcc

BUFFER

FM - IF

Q.D.

REG

OSC

BUFFER

NARROW

S-METER S-METER

LED

DRIVER

RF MIX

AM-IF DET

AGC

POST

AMP

AM-IF FM-IF FM-IN

AM-IN

17 16 15 14 13 12

LA3401 (IC403)

VOL

REG OSC

SYMMETRICAL

REOCTANCE

CIRCUIT

PHASE

COMPARATOR

VCO STOP

PILOT DET

FF FF FF

38kHz

38kHz 90°

19kHz 90°

MUTING

FM AM CHANGE

Rc Rb

234

DECODER MUTING CONTROL

FM AM CHANGE OVER

Vcc ON

MUTING

OUTPUT

STEREO

SWITCH

TRIGGER

LAMP

DRIVER

10 11

LC72131M (IC401)

120

219

318

417

516

615

714

813

912

10 11

XIN

BO1

BO2

BO3

BO4

IO1

AOUT

AIN

FMIN

AMIN

IO2

IFIN

Vss

XOUT 1

A OUTPUT

A –INPUT

A+INPUT

B OUTPUT

B –INPUT

B +INPUT

S10

STB

DATA

S10

GND

Vss

2~12

12~27

Vss

GND

S1~S10

DATA

STB

GND=0V

Vss=-8.0~-17V GND=0V

VIDEO OUT

VIN1

12345 67

6dB

amp

Vcc

video switch

(4 inout 1 output)

control

driver

GND

VIN2

VIN3

VIN4

TC9273N-007 (IC300)

NJM2068DD (IC301,602)

LA7952 (IC500)

(U.S.A./Canada model)

Border Input

Pin No Symbol Name Function

Dual Power Use:VDD = 8.0~17 V Single Power Use:VDD = 8.0~18V

+Power Terminal

Digital Ground

+Power Terminal

I/O Terminal

Clock Input Low level

Terminal

Clock input for data transfer.

Serial input for switch setting.

Strobe InputStrobe input for data writing.

Strobe Input

Data Input

Input terminal of analog switch.

TC9273N Terminal Function

DRA-295

ABLC

GND

Vcc

161 152 143 134 125 116 107 9

STR

GND

OUT4

OUT3

OUT2

OUT1

OUT

SWin

GNDS

SRin

SLin

GNDC

Cin

DNDR

Rin

GNDL

Lin

BYPASSR

BLPASSL

LTRE

LBASS3

LBASS2

LBASS1

CLK

DATA

LATCH

DGND

AGND

CL1

CL2

CR1

CR2

RTRE

RBASS3

RBASS2

RBASS1

tone tone

OUTPUT

PORT

MCUI/F

OUT

B.P.F

volume

M62446FP (IC601)

PC74HC4094 (IC600)



ICP-N15 (IC105)



P43T7D330BW16

NJL64H380A (RMC900)

IC PROTECTOR

IR SENSOR



POSISTOR

Detector

FRONT VIEW

Vout

GND

Vcc

FRONT VIEW

CXA1511M(IC501)

(U.S.A./Canada model)

81 72 63 54

GND NC

OUT

TDA7330B (IC901)

(Europe model only)

MUXIN

VREF

COMP

FILOUT

GND

OSCOUT

OSCIN

POR

FSEL

VCC

ARI

QUAL

RDDA

RDCL

T57

NJM7805FA (IC104)

NJM7812FA (IC502)

(U.S.A./Canada model)

KIA7815AP (IC101)

NJM7915FA (IC102)

Input

GND

Output

FRONT

VIEW

GND

Input

Output

FRONT

VIEW

ABLC

–

C2 GND

NC OUTVcc

Head

Amp

Limiter

Amp BPF

BEF Detector &

Comparator Integrator Hysteresis

Comparator

22kohm

Comparator

LimiterAmpHead Amp

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