Denon UD-M31 Service Manual

SERVICE MANUAL

For Europe & U.K. model

Version 2

MODEL

STEREO CD RECEIVER

UD-M31

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

16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN

Telephone: 03 (3837) 5321

X0164V.02 DE/CDM 0302

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.

DISASSEMBLY

(Follow the procedure below in reverse order when reassembling)

1. TOP COVER

(1) Remove 2screws ① on both sides. (2) Remove 5screws ② on the rear.

(3) Detach the Top Cover to the arrow direction.

Top cover

2UD-M31

2. FRONT PANEL

(1) Disconnect FFC on thr rear of the CD

Mecha.

(2) Remove 4 lower screws ③ (3) Detach the Front Panel with releasing the

hooks on both sides.

3. CD MECHANISM UNIT

(1) Disconnect FFC coming from the top of the

CD Mecha.

(2) Unplug the connector on fhe rear of the

µcom PWB .

(3) Unplug the connector on the I/O PWB. (4) Remove 4 screws ④ on the µcom PWB .

(5) Fully pull out the loader by turning the gear

under the loader of the CD Mecha.

(6) Remove 4 screws ⑤ to detach the CD

Mecha.

FFC

CD Mecha.

Front Panel

Hook

µcon P.W.B.

Connector

I/O P.W.B.

Gear

Loader

FFC

3UD-M31

4. REAR PANEL

(1) Pull out the cord bush. (2) Remove 12 screws ⑥

5. MAIN PWB

(1) Remove 4 screws ⑦ fixing the radiator the chas-

sis. (2) Unplug 3 connectors on the AMP PWB. (3) Detach the Main PWB together with the radiator .

(4) Remove 5 screws ⑧ . (5) Detach the Power PWB.

Cord Bush

Connector

Power P.W.B.

6. DISPLAY PWB

(1) Pull out the VR knob. (2) Remove the spacer and the VR nut ⑨ . (3) Remove 7 screws ⑩ .

Main P.W.B.

Radiator

VR knob

BLOCK DIAGRAM

TUNER MODULE

MECHA

CD11FTA3N

FL401

FL TUBE

IC801

LA6559

DRIVER

IC802

LA9241

RF AMP

LC75725E

FL DRIVER

IC401

IC803

LC78625E

CD DSP

IC805

BA6287F

IC303

LC72720NM

RDS(E2/EK only)

IC804

BA4510F

IC202

93LC66

IC201

UPD784216

MICON

IC301

BU4066BCF

REC OUT SEL

IC302

LC75432M

SELECTOR & VR & EQ

IC304

BA15218F

IC305

BA15218F

REC out

Pre out

UD-M31

IC402

RPM6938

TACT SW & VR ENCORDER

IC203

BA05ST

DENON

BUS

TR601∼603

IC602

NJM

7805FA

P.DOWM

IC603

NJM

7812FA

IC604

NJM

7806FA

TR607

IC205

M51957

IC501

STK402-050

POWER AMP

IC605

NJM7805F

POWER

TRANS

RL601

RELAY

Protection

TR501∼

SUB

TRANS

RL602

POWER

RELAY

OUT

AC IN

LEVEL DIAGRAM

0dB=0.55V

UNIT

UD-M31

LINE 1

LINE 2

LINE 1

REC

LINE 2

REC

PRE OUT

-10dB

UNIT

ANALOG SWITCH 4066

(dBV)

+16dB

0dB play back CD=1.1V

0dB

LINE:1kHZ,150mV

EQ:FLAT

SDB:OFF

FUNCTION SWITCH

+4dB

+0.83dB

MASTER VOLUME

BUFFER BUFFER

LC75342M

MUTE

-16.4dB

(+6dB)

TOTAL 36dB

POWER AMPTONE/SDB

RELAY SP

ATT

(+30dB)

15W/6

9.49V

-104dB

87.6dB

CD TEST MODE

 Setting of the test mode and explanation of each button

ITEM OPERATION FUNCTION DISPLAY

6UD-M31

1 Start the mode

2 Disc load

Focus and Track-

ing check mode

4 Move pick up

5 Stop move Push the STOP button Stop the movement 1.Display "01"

6 All Servo on Push the SKIP button All servo on, and auto adjust

7 Clear this mode Unplug the AC cord

Plug the AC cord to the wall outlet while pushing the POWER button and the Function button

1.Push the OPEN/CLOSE button and the LOADER open

2.Place the disc and push the OPEN/CLOSE button again

1.Push the PLAY button

2.Push the PLAY button again

3.Push the PLAY button again

1.Push the SKIP forward button or the SKIP reverse button while stopping

VCC VREF

1.This service mode starts

2.Pick up moves to the 10mm position.

1.Load the CD disc

2.The pick up moves to the 10mm position

1.The laser ON

2.forcus servo on,the disc turns

3.Tracking servo and Slide servo on

The pick up move forward or reverse

1.Display "01"

2.The PLAY and the PAUSE mark lit

1.Display "01"

2.The PLAY and the PAUSE mark lit

1.Display "02 L on"

2.Display"03 Fon"

3.Display "04 t on"

1.Display "5 O PU"

1.Display "06 Adj."

1.after auto adjust,d display "01"

1U-3507

CD UNIT

* Laser light of the pickup is always emitted regardless of DISC loading in the test mode. You may lose your eyesight if you look into the laser directly. So be careful enough when operating in the test mode.



 How to check the test mode



( 1 ) DISC discrimination, adjustment

* Insert DISC, and press the AUTO SEARCH REVERSE button. * “06 Adj” is displayed, and discrimination of DISC size 8 cm/12 cm, discrimination of DISC reflectance (CD, CD-

R/CD-RW), adjustment of focus, tracking offset, and EF balance will be performed. (Adjusted values are not displayed: Refer to Fig. 2, 3)

7UD-M31

SLD

DRF

Fig. 2 DISC discrimination,

Fig. 3 Adjustment of EF balance

adjustment (Case of CD-RW)

* After completing the discrimination and adjustment, it becomes stop condition. * Once discrimination of DISC has been carried out in the “06 Adj” mode, discrimination of size and reflectance is

no longer made, and only adjustment will be performed.

( 2 ) Checking of servo state

* Press the PLAY button after performing above (1) “DISC discrimination, adjustment”. * “02 L on” is displayed, and the laser will start to light. (The pickup may vibrate with a rattling noise if DISC has

been loaded, but this is not abnormal.) * Press the PLAY button again. * “03 F on” is displayed. DISC starts turning, and focus servo will be actuated. (Refer to Fig. 4, 5)

Fig. 4 In “03 F on” Fig. 5 In “03 F on”

* Press the PLAY button again. * “04 t on” is displayed. Tracking, CLV, and slide servo will be actuated. * Monitor HF signal using the Test Point, HF point and VC point.

Check that the signal’s amplitude is 1.5V±0.3Vp-p. (Refer to Fig. 6)

A (A=1.5±0.3Vp-p)

Fig. 6 In “04 t on”

WAVE-FORMS OF EACH POINT

8UD-M31

DRF

When 12 cm DISC start

When 8 cm DISC start

When focus servo on

DRF

When 12 cm DISC stop

When 8 cm DISC stop

During PAUSE

OPEN

Track search (when forward)

During PLAY

When the tray OPEN

Track search (when reverse)

Focus search (no DISC)

SEMICONDUCTOR

IC’s µPD784216AGC-8EU(IC201)

9UD-M31

100

µPD784216AGC-8EU Terminal Function

Pin No.

1 P120/RTP0 ENC A I Rotary encoder INPUT A RECIEVER -

2 P121/RTP1 ENC B I Rotary encoder INPUT B RECIEVER -

3 P122/RTP2 V.MUTE O Volume mute output, mute;High RECIEVER H

4 P123/RTP3 POWER O Amp circuit power ON/OFF output, ON:High RECIEVER L

5 P124/RTP4 /R.MUTE O Speaker Relay ON/OFF output, ON:High RECIEVER L

6 P125/RTP5 NC O Not used :NC OTHER L

7 P126/RTP6 SEL.EEPROM O EEPROM chip enable output RECIEVER L

8 P127/RTP7 FLCE O Chip select output to FL tube controller OTHER L

9 VDD VDD - Positive power OTHER -

10 X2 X2 - X'tal connection for main clock oscillation OTHER -

11 X1 X1 I X'tal connection for main clock oscillation OTHER -

12 VSS VSS - GND potential OTHER -

13 XT2 XT2 - x'tal connection for main sub-clock oscillation,

14 XT1 XT1 I x'tal connection for main sub-clock oscillation,

15 /RESET /RESET I Micro-computer reset input OTHER -

16 P00/INTP0 REMOCON I Remote-control receive data input RECIEVER -

17 P01/INTP1 50/60 I 50/60Hz AC input RECIEVER -

18 P02/INTP2/NMI /DB RXD I DENON BUS Data input (interrupt input) RECIEVER -

19 P03/INTP3 PROTECT I Speaker Terminal DC voltage detect signal input RECIEVER -

20 P04/INTP4 SEL.EEPROM O EEPROM chip enable output RECIEVER L

21 P05/INTP5 WRQ I SUB CODE Q STAND BY CD L

22 P06/INTP6 /INT I NC, connect to grand OTHER -

23 AVDD AVDD - A/D converter analog power OTHER -

24 AVref0 Avref0 - A/D converter reference voltage input OTHER -

25 P10/ANI0 KEY1 I Unit operation button input1 RECIEVER -

26 P11/ANI1 KEY2 I Unit operation button input2 RECIEVER -

27 P12/ANI2 KEY3 I Not used :Connect to GND OTHER -

28 P13/ANI3 KEY4 I Not used :Connect to GND OTHER -

29 P14/ANI4 NC I Not used :Connect to GND OTHER -

30 P15/ANI5 DRF I REFLECTION OF DISC SIG. Input CD -

31 P16/ANI6 FSEQ I EFM SYNC SIG. INPUT CD -

32 P17/ANI7 DARXD I DATA BUS(for VOL,PLL,RDS IC, EEPROM)

Port Symbol I/O Function RECIEVER or CD

not used : :NC

not used :Connect to VSS orVCC

Data in

outputs of

standby&Defoult

10UD-M31

Pin No.

33 AVSS AVSS - A/D,D/A converter GND position OTHER -

34 P130/ANO0 LINE1 O LINE OUT Control signal output1 OTHER L

35 P131/ANO1 LINE2 O LINE OUT Control signal output2 OTHER L

36 AVref1 Avref1 - D/A converter reference voltage input OTHER -

37 P70/RxD2/SI2 SQOUT I Sub Q code data input CD L

38 P71/TxD2/SO2 COIN O CD-DSP serial communication data output CD L

39 P72/ASCK2/

40 P20/RxD1/SI1 NC I Pull up RECIEVER -

41 P21/TxD1/SO1 FLDT O DATA BUS for FL driver, Data output RECIEVER L

42 P22/ACSK1/

43 P23/PCL NC I Pull up RECIEVER -

44 P24/BUZ /RDSRST O RDS IC reset output RECIEVER -

45 P25/SI0/SDA0 DB RXD I DATA BUS for DENON BUS Data input RECIEVER -

46 P26/SO0 DB TXD O DATA BUS for DEON BUS Data output RECIEVER L

47 P27/SCK0/SCL0 DB CLK O DENON BUS Clock output RECIEVER L

48 P80/A0 /SD I FM/AM Tuning signal input, Tuned:Low RECIEVER -

49 P81/AÇP /ST INC I FM stereo demodulation detect input, Ste-

50 P82/A2 /TMUTE O Tuner mute output, mute:Low RECIEVER L

51 P83/A3 AUTO/MONO O FM AUTO/MONO switching, MONO:High RECIEVER L

52 P84/A4 USA I Initial setting input RECIEVER -

53 P85/A5 EURO I Initial setting input RECIEVER -

54 P86/A6 FREQ I Initial setting input RECIEVER -

55 P87/A7 RDS I Initial setting input RECIEVER -

56 P40/AD0 SL+ O SLIDE kick Forward CD L

57 P41/AD1 SL- O SLIDE kick Reverse CD L

58 P42/AD2 CD/!RW O CD, CD-RW gain switching CD L

59 P43/AD3 SERACH O SEARCH control CD L

60 P44/AD4 NC O OPEN CD L

61 P45/AD5 NC O OPEN CD L

62 P46/AD6 LED POWER G O POWER/STANDBY Green LED out-

63 P47/AD7 LED POWER R O POWER/STANDBY Red LED output,Light:High

64 P50/A8 NC I Pull up CD -

65 P51/A9 NC I Pull up CD -

66 P52/A10 CLSW I LOADER CLOSE SW input CD -

67 P53/A11 OPSW I LOADER OPEN SW input CD -

68 P54/A12 NC I Pull up CD -

69 P55/A13 NC I Pull up CD -

70 P56/A14 NC I Pull up CD -

71 P57/A15 O Not used :NC OTHER L

72 VSS VSS - GND potential OTHER -

73 P60/A16 BLK O FLD ON/OFF control port, L= black out FLD

74 P61/A17 DATXD O DATA BUS(for VOL,PLL,RDS IC, EEPROM)

75 P62/A18 DACLK O DATA BUS(for VOL,PLL,RDS IC, EEPROM)

76 P63/A19 DACE O DATA BUS(for VOL,PLL,RDS IC) Chip enable

77 P64/RD DRP_RST O CD-DSP reset output, output, reset:High CD L

78 P65/WR O Not used :NC OTHER L

79 P66/WAIT PWBCHK I Start PWB check mode OTHER -

Port Symbol I/O Function RECIEVER or CD

CQCK O CD-DSP serial communication clock output CD L

SCK2

FLCLK O DATA BUS for FL driver, Clock output RECIEVER L

SCK1

RECIEVER -

reo:Low

put,Light:High

RECIEVER L

Data output

RECIEVER L

Clock output

RECIEVER L

output

outputs of

standby&Defoult

11UD-M31

No.

80 P67/ASTB O Not used :NC OTHER L

81 VDD VDD - Positive power OTHER -

82 P100/TI5/TO5 OPEN O CD mecha. Open CD L

83 P101/TI6/TO6 CLOSE O CD mecha. Close CD L

84 P102/TI7/TO7 O NC OTHER L

85 P103/TI8/TO8 O NC OTHER L

86 P30/TO0 RWC O CD-DSP serial communication read / write CD L

87 P31/TO1 O Not used :NC OTHER L

88 P32/TO2 DRV_MUTE O DRIVER MUTE CD L

89 P33/TI1 O Not used :NC, CD L

90 P34/TI2 CDPOWER O CD power control signal output CD L

91 P35/TI00 O Not used :NC, OTHER L

92 P36/TI02 O Not used :NC OTHER L

93 P37 HPSW I HEADPHONE Insertswitch detective signal input

94 TEST/VPP TEST I not used :Connect to GND OTHER -

95 P90 O Not used :NC, OTHER L

96 P91 OPSW I Pickup inner-most detect input, inner most:Low

97 P92 O Not used :NC OTHER L

98 P93 O Not used :NC OTHER L

99 P94 O Not used :NC OTHER L

100 P95 O Not used :NC OTHER L

Port Symbol I/O Function RECIEVER or CD

at on

outputs of

standby&Defoult

LC78625E(IC803)

RWC

WRQ

626364

FSX

SBCK

SFSYPWEFLG

6061

SBSY

DOUT

MUTER

RVDDRCHP

RCHN

RVSSLVSSLCHN

5152

LCHP

LVDDMUTEL

C2F

12UD-M31

ROMXA

CK2

LRSY

ASLRCK/P3

4142

SQOUT

CO IN

CQCK

RES

TST11

LASER

16M

4.2M

CONT

TEST5

XIN

XOUT

TEST1

DEFI

4567

TAI

PDO

ISET

VVSS

VVDD

VSS

EFMO

EFMIN

12 13

TEST2

17 18 19 20

15 16

V/P

FST

FOCS

FZD

CLV-

CLV+

HFL

TES

PCK

FSEQ

23 24

TOFF

TGL

ASDEPC/P2

ASDFIN/P1

ASDACK/P0

TST10

DACKO

DFOLO

DFORO

LRCKO

EMPH

TEST4

DEMO

JP-

JP+

TEST3

THLD

DEFI

EFMIN

FSEQ

CLV+

CLV-

V/P

PW SBCK SBSY

SFSY

WRQ

SQOUT

CQCK

CO IN

RWC

DEMO

EFMO

Slice Level

Control

Synchronization

detection

EFM Demodulation

CLV

Digital servo

Subcode

separation

Q CRC

Microprocessor

Interface

Servo

commander

FST

HFL

FZD

TOFF

FOCS

TES

RES

VVSSVV

JP+

PDO

ISET

VCO

oscillator

Clock control

JP-

TGL

THLD

PCK

detection and correction

CONT

LASER

EMPH

TST11

TST10

TAI

TEST1

RAM

TEST2

8-bit

TEST3

C1 and C2 error

Flag processing

Crystal oscillator system

Timing generator

16M

4.2M

EFLG

TEST5

TEST4

Level meter Peak meter

XIN

FSX

XOUT

VSSV

CK2

RAM address

generator

Interpolation

and mute

Bilingual function (1)

Digital

attenuator

8´ oversampling

digital filters

Bilingual function (2)

One-bit D/A

converter

RCHP

MUTER

Digital output

LCHN

RCHN

LCHP

interface

ports/Anti-shock

General-purpose

MUTEL

LRSY C2F ROMXA

DOUT

ASDACK/P0

ASDFIN/P1

ASDEPC/P2

ASLRCK/P3

DACKO DFOLO

DFORO

LRCKO

LC78625E Terminal Function

Pin No. Symbol I/O Function

1 DEFI I Defect detection signal (DEF) input (This pin must be connected to 0 V if unused.)

2TAII

3 PDO O External VCO control phase comparator output

PLL pins

5 ISET AI PDO output current adjustment resistor connection

7 FR AI VCO frequency range adjustment

8 VSS Digital system ground. (This pin must be connected to 0 V.)

9EFMOO

10 EFMO O EFM signal output

Slice level control

11 EFMIN I EFM signal input

12 TEST2 I Test input. A pull-down resistor is built in. This pin must be connected to 0 V in normal operation.

CLV

15 V/P O

O Spindle servo control output. Acceleration when CLV+ is high, deceleration when CLV- is high.

O Three-value output is also possible when specified by microprocessor command.

Rough servo/phase control automatic switching monitor output. Outputs a high level during rough servo and a low level during phase control.

16 FOCS O Focus servo on/off output. Focus servo is on when the output is low.

17 FST O Focus start pulse output. This is an open-drain output.

18 FZD I Focus error zero cross signal input. (This pin must be connected to 0 V if unused.)

19 HFL I Track detection signal input. This is a Schmitt input.

20 TES I Tracking error signal input. This is a Schmitt input

21 PCK O EFM data playback clock monitor. Outputs 4.3218 MHz when the phase is locked.

22 FSEQ O

Synchronization signal detection output. Outputs a high level when the synchronization signal detected from the EFM signal and the internally generated synchronization signal agree.

23 TOFF O Tracking off output

24 TGL O Tracking gain switching output. Increase the gain when low.

25 THLD O Tracking hold output

26 TEST3 I Test input. A pull-down resistor is built in. (This pin must be connected to 0 V.)

30 DEMO I

Digital system power supply.

Track jump output. A high level output from JP+ indicates acceleration during an outward jump or deceleration dur-

ing an inward jump.

A high level output from JP- indicates acceleration during an inward jump or deceleration during an outward

jump.Three-value output is also possible when specified by microprocessor command.

Sound output function input used for end product adjustment manufacturing steps. A pull-down resistor is built in. (This pin must be connected to 0 V.)

31 TEST4 I Test input. A pull-down resistor is built in. (This pin must be connected to 0 V.)

32 EMPH O De-emphasis monitor pin. A high level indicates playback of a de-emphasis disk.

33 LRCKO O

34 DFORO O Right channel data output

35 DFOLO O Left channel data output

Digital filter outputs

36 DACKO O Bit clock output

37 TST10 O Test output. Leave open. (Normally outputs a low level.)

ASDACK

/P0

ASDFIN/

ASDEPC

/P2



When antishock

I/O

mode is not used,these pins are

I/O Left and right channel data input

used as general purpose I/O ports (P0 to P3). They must either

I/O

be set to input mode and connected to 0 V,

ASLRCK/

or set to output mode

I/O L/R clock input

and left open, if unused.

Test input. A pull-down resistor is built in. (This pin must be connected to 0 V in normal operation.)

Internal VCO ground. (This pin must be connected to 0 V.) PLL pins

Internal VCO power supply.

EFM signal inverted output

Word clock output

Bit clock input

The antishock inputs in antishock mode.

Sets the built-in de-emphasis filter on or off.(High: on, low: off)

13UD-M31

Pin No. Symbol I/O Function

42 LRSY O

43 CK2 O Bit clock output(after reset)

44 ROMXA O Interpolation data output(after reset) ROM data output (during ROMXA mode)

ROMXA application output signals

L/R clock output

Inverted polarity clock output(during CK2CON mode)

45 C2F O C2 flag output

46 MUTEL O

Left channel mute output

Left channel power supply

48 LCHP O Left channel P output

49 LCHN O Left channel N output

One-bit D/A converter signals

Left channel ground. Must be connected to 0 V.

Right channel ground. Must be connected to 0 V.

52 RCHN O Right channel N output

53 RCHP O Right channel P output

Right channel power supply

55 MUTER O Right channel mute output

56 DOUT O Digital output

57 SBSY O Subcode block synchronization signal output

58 EFLG O C1, C2, single and double error correction monitor pin

59 PW O Subcode P, Q, R, S, T, U and W output

60 SFSY O Subcode frame synchronization signal output. This signal falls when the subcodes are in the standby state.

61 SBCK I Subcode readout clock input. This is a Schmitt input. (This pin must be connected to 0 V if unused.)

62 FSX O Output for the 7.35 kHz synchronization signal divided from the crystal oscillator

63 WRQ O Subcode Q output standby output

64 RWC I Read/write control input. This is a Schmitt input.

65 SQOUT O Subcode Q output

66 COIN I Command input from the control microprocessor

67 CQCK I

Input for the command input acquisition clock or the SQOUT pin subcode readout clock input. This is a Schmitt input.

68 RES I Reset input. This pin must be set low briefly after power is first applied.

69 TST11 O Test output. Leave open. (Normally outputs a low level.)

70 LASER O Laser on/off output. Controlled by serial data commands from the control microprocessor.

71 16M O 16.9344 MHz output

72 4.2M O 4.2336 MHz output

73 CONT O Supplementary control output. Controlled by serial data commands from the control microprocessor.

74 TEST5 I Test input. A pull-down resistor is built in. (This pin must be connected to 0 V.)

75 CS I Chip select input. A pull-down resistor is built in. This pin must be connected to 0 V if unused.

77 XIN I

78 XOUT O

Crystal oscillator ground. Must be connected to 0 V.

Connections for a 16.9344 MHz crystal oscillator

Crystal oscillator power supply

80 TEST1 I Test input. A pull-down resistor is built in. (This pin must be connected to 0 V.)

14UD-M31

Note: All power-supply pins (VDD, VVDD, LVDD, RVDD, and XVDD) must be connected to the same potential.

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