Kenwood DDX 8037 Service Manual

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DDX8017/8027/8027Y
DDX8037/8047/8067

NOTES ON ASSEMBLING THE MECHANISM

1. Fasten Screw A so that the interval (a) will be about 5.2mm
and the interval (b) will be about 2.6mm (The interval (a)
can be measured using a pair of vernier calipers or similar
tools.)

2. Turn B so that Position (0) will come at about the center of
interval (d).

3. Then, play the test disc and fine tune A or B so that the jitter
value would be minimized.

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14

COMPONENTS DESCRIPTION

Ref. No. Application] Function Operation] Condition] Compatibility

IC4 OP amp For audio signal amplification (Front)

IC5 3-terminal regulator 5V is output from 8V

IC6 Audio DAC D/A conversion of audio signal (Front, Rear, Center, Sub-woofer)

IC7 A/D converter A/D conversion of audio signal (Lch, Rch)

IC9 DSP Processing of computing for Dolby 5.1ch, dts etc.

IC1O DIR Conversion of S/PDIF format data to digital audio format

IC11 OP amp For audio signal amplification (Front)

IC12 Analog switch Switching audio signal (Sub-woofer) and A4V

IC18 Logic IC Inverter for generating clock

IC19 3-terminal regulator 1.25V his output from 3.3V

IC20,21 3-terminal regulator 3.3V is output from 5V

IC300 DC/DC converter For control of 5V and 7.8V

013 Digital transistor Comes ON at the time of momentary power down, resetting, and in audio muting timing
014,15 Transistor for audio muting Comes Mute at the time of momentary power down, resetting, and in audio muting timing
0300,302 Digital transistor Reference lor voltage input at the time of DC-DC external oscillation frequency input stoppage
0303 FET For generation of 5V and 7.8V

0306~310 Digital transistor For Power ON control

0312 FET For SW14.4V generation

0313 Transistor*2 For SW14.4V control

0 DVD UNIT (X37-1070-00)

Ref. No. Application] Function Operation] Condition] Compatibility
IC1 RF signal processing IC RF signal processing

IC2 Driver Driver for motorists/pickup actuators

IC3 FLASH ROM FW maintenance for optical DISC control IC
IC4 p-com built-in optical DISC control IC Optical DISC control in general/ATAPI interface
IC5 Voltage detection IC For reset of optical DISC control IC

IC8 Voltage detection IC For monitoring power supply voltage

IC9 S1 .5V power supply IC SSV ~> S1.5V

IC1O S3.3V power supply IC 85V ~> S3.3V

IC11 EEPROM Data storage for optical DISC control IC

01 MOS-FET DVD laser diode ON/OFF control

02 MOS-FET CD laser diode ON/OFF control

07 AFC transistor CD laser diode light emission amount control
08 AFC transistor DVD laser diode light emission amount control
09 MOS-FET For CD laser diode protection

010 MOS-FET For DVD laser diode protection

011 Resistor built-in transistor LO-MUTE signal control

012 Resistor built-in transistor FG signal control

013 Resistor built-in transistor BMS signal control

014 Resistor built-in transistor DRMU signal control

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42

ADJUSTMENT

2. Freerun Frequency Adjustment (X35: VR301)

Measurement Location
Adjustment
No. Adjustment Method Timing controller 1 DIN 2D|N Adjustment Value
Location
ICSOI X35-448 X35458
1 Set TP ot NVD TP as no input NVD (21pm) TP363B TP55
and connect to PON3.3V.
Set TP of NHD TP as no input and NHD (22pin) TP304B TP17
connect to PON3.3V.
2 Adjust frequency of HSYNC with NDSH (9pin) TP307B TP106 VR301 15.734kHZt0.01kHZ
a frequency counter. (NTSC type)
15.625kH2i0.01kHZ
(PAL type)

3. Flicker Adjustment (X35: VR203)
Condition (As usual)

Video source: VIDEO

Video: Luster white 30~50°/a

BRIGHT: MAX

MODE: ZOOM

Ad'ustment Procedure
1. Set to the above condition.

2. Vary VR203 and adjust so that the side width that appear
on screen top would become smallest.

4. Horizontal Display Start Position and
OSD Display Position Adjustment

7 Screen adjustment key: HPOSI i

Go tote next adjustment screen

Next
|:| Witt

|:|

OSD

|::| 94 X

i

l
Return to the menu screen

OSD adjustment key

|:|

Horizontal screen position adjustment

Screen Adjustment Key (HPOSI)

: Horizontal display start position adjustment of entire screen
OSD Adjustment Key

: Horizontal display start position adjustment of OSD only

About the video for ad'ustment screen
DVD: Monoscope (TDV-540A, Title :2. Chapter : 16)
TV: Monoscope
VIDEOt: Monoscope
Navigation: Input KNA-DV3200
* For NTSC area destination: NTSC video
For PAL area destination : PAL video
96 As for TV tuner Box, use the TV Tuner Box suited for each
destination.
* NAVI screen is NAVI Menu Screen.

Ad'ustment Procedure
1. Press HPOSI on Test Mode Menu Screen.

2. Adjust HPOSI display start position of the following five;
Graphic/DVD/TV/VIDEC/Navigation.

3-1. Graphic
Use OSD key to adjust so that background is not seen on
both sides of screen.
HPOSI key is not to be used. Pay attention not to used it. as
it can be operated on.

NG NG OK

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VIDEO LINE

SlGNAL LINE r N E F

GND LINE 3 § :1 E Z E E 8
<

*5 NE Z i Z 3 3 3 o 5

can R531
3 mu m

cm R532
we 3 a 7

cm R533
3 m

R53o 1K

Rana
K

R535 1K
5c coN

BF CLK
MC EEO
MC um
55 age

55 um

R535 mu
R537 mu
R538 mu
R539 1K
R540 1K

R555 mu
R557 mu
R553 mu

E' 6ND
mm
3 .14\/
0414 q Ream cm A

a lo lEIDDF V

I

I

|

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I

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l

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I

VGND ® ©

ems Rsso
o lo Run

7 5

ems R553
3 l0

Lch

cw R552
3 47 AGND

RSSl
1K rx

R550 Rx
1

VIDEO SELECTOR meow R559 um

X147COMP R570 um

R57l mm

0533 0530 D53l 0532

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.______________________________________3

DDX8017/8027/8027VIEDS7JED47JEDG7WEI

TVJUDGE

to NTuNEH

CAUTION : For con-
tinued safety, re-
place salety critical
components only
with manufacturers
recommended parts
(refer to parts list).
A Indicates safety
critical components.
To reduce the risk of
electric shock, leak-
age-current or resis-
tance measure-
ments shall be car-
ried out (exposed
parts are acceptably
insulated from the
supply circuit) before
the appliance is re-
turned to the cus-
tomer.

J503

- DC voltages are
as measured with
a high impedance
voltmeter. Values
may vary slightly
due to variations
between indi-
vidual instru-
m e nts o r/and
units.

X34-382/383x-xx 8/3 (2/2) 83