Kenwood DP 969 Service Manual

Page 1

I P-969

SPECIFICATIONS

Audio

Frequency response.
Signal -to-Noisa ratio
Dynamic range ..
Total harmonic distortion

. 4 H2~2O kHz

more than 95 dB

more than 93 dB

, 0.0035 % or less (1 kHz,
THDl

Channel separation more than 90 dB

Wow & flutter ...... . Below measurable limit
(20.001 %, W PEAK)

Line output level ................ 2.0 V

Format

Type ,,,,,,,,,, Compact disc player

Read system Non-contact optical pick-up
system

Laser pick-up .................... GaAIAs. )\= 780 nm, 3-beam
type

Spindle speed ....
Error correction . .

.. About 200 rpm - 500 rpm

, Cross Interleave Read
Solomon Code

Number of channels ........... 2 channels

Note:

General
Power consum 16 W
Dimentions .. W: 340 mm (13-3/8)
H: 84 mm (3»5/16)
». D. 349 mm (13-3/4)
Weight (Natl .................... 4.0 kg (8.8 lb)

Remote control unit
Model ............................. RC-P969

System .. . . Infrared beam pulse
Power requirements. DC 3 V: R6 (AA) x2
Dimentions ............ . H: 157 mm (6-3/16")

W: 68 mm (2-11/16)

D: 18 mm (11/16)
Weight ............................ 115 g (0.263 lb) (With bat-

teriesl

We follow a policy of advancements in development. For this reason specifications may be changed without notice.

Note:

Component and circuitry are subject to modification to insure
best operation under differing local conditions. This manual is
based on, the Europe (El standard, and provides information on
regional circuit modification through use of alternate schematic
diagrams, and information on regional component variations
through use of parts list.

KENWOOD CORPORATION

Shionogl Shibuya Building. 17-5. 2-chome Shihuya. Shibuyadtu. Tokyo 150. Japan

KENWOOD U.S.A. CORPORATION
2201 East Dominguez Street Carson. CA 90810:
550 Clark Drive Mount Olive. NJ 07828. U.S.A.

KENWOOD ELECTRONICS CANADA INC.

PO. Box 1075 959 Gana 0mm, Mlssissauua, Ontario. Canada L4T 402
KENWOOD ELECTRONICS BENELUX N.V.
Mechelsesteenweg 415 5-1930 Zaventern. Belgium

KENWOOD ELECTRONICS DEUTSCHLAND GMBH
Rembriicker-Str. 15. 6056 Heusenstamm. West Germany

TRIO- KENWOOD FRANCE S. A.

Hi- Fi- VIDEO- CAR Hi-Fi

13. Boulevard Ney, 75018 Paris, France

TRIO-KENWOOD UK LTD.

I7 Bristol Road. The Metropolitan Centre, Graenlotd, Middx. U36 5UP England
KENWOOD ELECTRONICS AUSTRALIA PTY. LTD.
4E Woodcock Place, Lane Cove. new 2066. Australia

KENWOOD & LEE ELECTRONICS, LTD. .
Wang Kee Building. 5th Floor, 34-37.Connaught Road, Central. Hunv Kong

)

COMPACT DISC PLAYER

DP-969

SERVICE MANUAL

KnobiButtonl Knob(Bultofll
(K29 -2552 -04lx2 (29-2553 -O4lX3

Panel ass'y Metallic cabinet Sub panel ass'y
lA29-D101-04) lAO1-1543-01l (A22-0660-03)

llllilifll llli'.| lll

KnobiButton)
iK29 4354-04) 1

Knobassy (Power) Foot Panel
(K294551303) (J02~0186-05)x4 lA2D-5185-02l

Remote controller assy
lA70-O168-06l

Phone jacki1 P)

Phono jack(2P)
(573-0131 ~05)

(E13-0235-05l

Power cord bushing
(J42-0083-05)

cap AC power cord
(3094106805) (E30-l

rlabels onmo nside
:to laser: product safet

\
LEI: radiation: when 8

vetkr

_* Refer to parts list on page 73.

Page 2

I P-969

CONTENTS

CAUTION ............................... 3
DISASSEMBLY FOR REPAIR ................. 3
BLOCK DIAGRAM ........................ 6
CIRCUIT DESCRIPTION .................... 7
1. Description of components ................ 7
1-1. ELECTRIC UNIT (X25-2932-71) ....... 7
2. Key names and displays .................. 8
2-1. Key names ...................... 8
2-2. Display panel ..................... 8
2-3. Display description ................. 9
3. Microprocessor pPD75208CW-052
(X25-2932-71 : Ic1) .................... 10
3-1. Terminal connection diagram .......... 10
3-2. Explanation of terminals ............. 10
3-3. Test mode ...................... 11
0 Effective keys in the Test mode and their
functions .................... 11
3-4. Flow chart of test mode ............. 12
0 Flow chart from tray OPEN status after
power ON .................... 12
0 Focus search & Focus servo ON ...... 13
0 Tracking servo ON .............. 14
0 Disc motor stop ................ 14
0 From loading of 0 data to display . . .. 15
0 Flow chart from the time the tray opens
until the STOP indicator light, after press-
ing the tray ................... 15
4. RF Amplifier CXA1081S (X25-2932-71 : ICE) . . 16
4-1. Block diagram ................... 16
4-2. Explanation of terminals ............. 17
4-3. Explanation of function ............. 18
0 RF amplifier .................. 18
0 Focus error amplifier ............. 18
0 Tracking error amplifier ........... 19
0 Focus OK circuit ............... 19
0 Mirror circuit .................. 20
o EFM comparator ............... 21
O Defect circuit .................. 21
5. Servo signal processor CXA1802$
(X25-2932-71 : I04) ................... 22
5-1. Terminal connection diagram ......... 22
5-2. Block diagram ................... 22
5-3. Explanation of terminals ............ 23

6. Digital signal processing LSI CXDI1250 »

(X25-2932-71: IC2) ................... 24

6-1. Block diagram . . .( ................ 24
6-2. Explanation of terminals ............ 25

6-3. Explanation of functions .......... . . 27

0 CPU interface ................. 27

o EFM demodulation .............. 32

0 Sub code demodulation ........... 33

0 RAM interface ................. 34

0 Error correction ................ 35

o CLV servo control .............. 36

o Interpolation and mute,attenuate . . . . 41

I Mode setting .................. 42

o D/A interface .................. 43

o Countermeasured to defect ......... 43

0 Timing chart .................. 43
MECHANISM OPERATION DESCRIPTION ....... 46
1. OPEN/CLOSE operation ................ 46

2. Disassembling procedure of mechanism section . 49
2-1. Removing the clamper arm ........... 49

2-2. Attaching the clamper arm ........... 50

2-3. Removing the tray ......... ....... 50

2-4. Attaching the tray ................ 51

2-5. Removing the slider assy ............ 51

2-6. Attaching the slider assy ............ 52

2-7. When moving the pickup forcibly ...... 53
ADJUSTMENT .......................... 54
ADJUSTMENT ........................ 54
REG LAGE ........................... 56
ABGLEICH ........................... 58
DIFFRACTION GRID ADJUSTMENT ......... 60
VOLTAGE CHECK TABLE .................. 61
PC BOARD (COMPONENT SIDE VIEW) ......... 63
PC BOARD (FOIL SIDE VIEW) ............... 65
CIRCUIT DIAGRAM ...................... 67
EXPLODED VIEW (MECHANISM) ............. 71
EXPLODED VIEW (UNIT) .................. 72
' PARTS LIST ............................ 73
SPECIFICATIONS ................ BACK COVER

3

CAUTION/DISASSEMBLY FOR REPAIR

CAUTION

TRANSPORTATION SCREW

Before operation, remove the two red screws attached
to the bottom of the unit used during transport from the
factory. Remove both screws using a coin, etc. and, after
removing, retain them together with the Warranty
card and other documents. When the unit is to be trans"
ported again, be sure replace the two screws to their origi»
nal position.

ATTACHING THE TRANSPORTATION SCREWS

1. Turn the power ON without loading disc.
2. Turn OFF the power after the display shows the follow-
ing indication.

1 2 :1 4 5 max Nu

I _ Mex
s 7 a a 1a

1 I I ri Fl
14 «a 1:1 14 15 man: _ (_/ LI 1.!
1B 17 13 IE 20

MK SINGLE w:

aaM

4;
z
a;

3. Install the transportation screws.

DISASSEMBLY FOR REPAIR

DISASSEMBLING THE MECHANISM

1. Push the projection of the slider ass'y under the disc
clamper as arrowo.

2. The roller of the slider assy is dislocated at the stopper
position ( e ).

3. Lgtly draw the tray out as arrowed with your hand
I ).

' DP-969

Page 10

I P-969

CIRCUIT DESCRIPTION

4-3. Explanation of function
0 RF amp

The photodiode current input to the input pins (PDi,
PD2) is converted to a voltage by an equivalent resistance
of 58kQ in RF l-V amp (I) and (2) respectively. The
voltage which is converted from the current of the photo-
diode (A + B + C + D) is added in the RF summing amp and
is output from the RFO pin. The eye pattern can be check-
ed at this pin.

The low frequency component of the RFC output
voltage, VHFO is represented by the following equation:

VRFO =2.2 X (YA +VE)
=127.6k Q X (iPm +iPD2)

RF SUMMING AMP

L.__._ _._.

{a PD
A: '6- ED- OK
IPDZ I VB
.'

RF I-V AMP (2)

Fig. 4-2 RF l-V amplifier

0 Focus error amp

The difference between the RF I-V amp (1) output
(VA) and the RF l-V amp (2) output (VB) is calculated,
and the current of the photodiode (A + C - B - D) is
converted to a voltage and output.

The FE output voltage (low frequency) is represented by
the following equation:

VFE=5.4X (VA-VB)
= (iPnz -iPm) X315.4k§2

va 32K
-(B+D) ---IW
-(A+C) n;

V 32K

18

) 0 Tracking error amp
The current from the side spot photodiodes is input to
pins E 'and F_ and is converted to a voltage by the E l-V
amp and F l-V amp respectively. That is:

VF = iF X 403k S2
VE = E X 260k Q X RA/ (Re+ 22k) + (RA +260k)

Vet

gr

DP-969

) CIRCUIT DESCRIPTION

The difference between the E l-V amp and the F l-V
amp is calculated by the tracking error amp, and the photo-
diode (E-F) current is converted to a voltage and output.

VTE = (VE - VF) X 3.2
= (iE-iF) X 1290k 52

260K 28 K
V #9 a

F I-V AMP

73153.3-

53 5 tax

"1'

VF

4
m

@
W E TRACKING I
_ vs ERROR I
E _, AMP |
I I
so I
file I

I
I 5,260K |
zzxi; A E' l
J as s l-V me I
) := I l
,y, I. ________________ I

Fig. 4-4

0 Focus 0K circuit

The focus OK circuit creates a timing window, turning
the focusing servo ON with the focus search status.

While the RF signal is present at pin 2, its HPF output

) is present at pin 1. At the same time, the LPF output

(opposite phase) of the focus OK amp is obtained.
The focus OK output is inverted when VHFI-VnFo
=. -0.37V.

I

l

I

I

I Focus ox AMP
I

I.

From summing amplifier.

C34 is used to determine the time constants of the EFM
comparator, the HPF in the mirror circuit, and the LPF
in the focus OK amp. Normally, C34 = 0.01uF is selected,
with fc = lkHz. This will prevent degradation of the block
error rate due to an RF envelope lack caused by cracks, etc.
on the disc.

FOK

FOCUS OK

I
l
I
I
I
COMPARATOR |

__.._-___.____________.I

Fig. 4-5

19

Page 17

P-969

CIRCUIT DESCRIPTION

0 EFM demodulation
1) Playback of bit clock by EFM-PLL circuit

The EFM signal read out of the optical block contains
a clock component of 2.16MHZ. Therefore, it is possible to
take out a bit clock (PLCK) of 4.32MHZ synchronized
with this clock by the EFM»PLL circuit.

At each edge of EFM signal, phase comparison is made
with PLCK, which is 1/2 of VCO, is made and output is

(a) When EFM signal and VCO are synchronized

made by TRl STATE out of PDQ terminal. The mean value
of PDQ terminal is about 1/2 VDD if synchronized, but
the mean value drops when VCO becomes higher. On the
other hand, the mean value increases when VCO becomes
less. I

The timing charts of EFM terminal, EFMO, PLCK and
PDO are shown in Fig. 6-7.

E FM terminal I I
|

EFMO I :
-+___. .
l l I l
PLCK l l l I | l I l T
. . : : I : l
PDO terminal _ __ _ I I I Z I ._ I I

(b) When VCO is higher than EFM signal

__I I' ______

Z : High impedance

EFM terminal

EFMO

PLCK ._J

PDO terminal

(0) When VCO is less than EFM signal

2 : High impedance

EFM terminal m

|
EFMO

PLCK _| J

PDO terminal

2 : High impedance,

Fig. 6-7 Timing charts of EFM-PLL circuit

K:
n

as
or

DP-969

CIRCUIT DESCRIPTION

2) Detection, protection and interpolation of frame
synchronizing signals . '

There are cases during recording where the same pattern
is detected in the data due to the influence of drop-out
and jitter, even if a pattern that is same as the synchroni-
zing signal will not appear.

On the other hand, there also are cases where original
frame synchronizing signal is not detected. Therefore,
protection and interpolation are required besides detection.

The edge portion only of EFM signal (EFMO) latched
with PLCK is converted to "1 and the rest to ,0 and
then input is to a 23 bit shift register and a frame synchro-
nizing signal is detected.

In order to protect a frame synchronizing signal, a
window is provided and the same patterns outside of this
window are removed. This width can be selected with
WSEL. If no frame synchronizing signal is located in this
window, interpolation is made with a signal produced by
588-mal counter (4.3218MHz/588 = 7.35kHz)

A 4 bit counter for counting the number of these frames
to be interpolated is provided, and when its count reaches
the level selected with GSE L, GSEM, the window is ignored
and the 4 bit counter is reset with the next frame synchro-
nizing signal. the GTOP terminal is of "H" while this opera-
tion is performed. Further, GFS terminal is of "H" when
the frame synchronizing signal generated by the 588-mal
counter for making interpolation is synchronized with the
frame synchronizing signal from the disc.

The frame synchronizing signal before passage through
the window or the wondow is output out of UGFS (DA05
terminal at the time when PSSL = L.)

WSEL Window width

0 :3 clock
1 17 clock
Number of frames to ,r ,,
GSEM GSEL be interpolated UGFS (PSSL - L l
0 o 2 frames Window
0 1 4 frames Window
Frame synchronizing signal before
1 0 8 frames passage through window.
1 1 13 frames Window

The timing for write request signal (WREQ), Write
Frame Clock (WFCK), etc. is generated based on the pro-
tected and interpolated frame synchronizing signal.

3) EFM demodulation

14 bit data is taken out of the 23 bit shift register and is
demodulated to 8 bit data through 14 -> 8 conversion
circuit composed of array logics. Then a write request
(WREQ) signal is output to the RAM interface block,
and the data is then output to the data bus (D808~
DBOl) terminals) of the RAM in'accordance with the
OENB signal transmitted from said block.

0 Sub code demodulation
1) Sub code demodulation

synchronizing signals 80, 81 of 14 bit sub codes are
detected out of the 23 bit shift register, and sampling is
made in the timing that is synchronized with WFCK.

After delay of 80 by one frame, 80 + $1 is output out
of SCOR terminal and SO - Si is output out of SBSO ter-
minal (only when SCOR = H.)

Data (P~W) of sub codes only is input to the register
in the timing synchronized with WFCK after EFM demo-
dulation; and sub code 0 is output out of SUBQ terminal,
and at the same time, it is loaded in the 8 bit shift register
and is output out of SBSO terminal in correspondence to
a clock from EXCK terminal.

The detials of this timing will be shown in the paragraph
of CPU interface.

2) Sub code 0 error detection

The CRC sub code result is output from the CRCF pin
in synchronism with the SCOR pin. It goes L" when an
error is detected. At the same time as the CRCQ flag is
1", the CRCF flag is output from the SUBQ pin during
the time from the rising edge of the SCOR pin to the
trailing edge of the SUBQ pin. This timing is detialed in
"CPU interface".

33

Page 30

D P-969

58

ABGLEICH

EINGANGS- AUSGAIIGS- SPIELBR- ABGLEICH-
NR. GEGENSTAND EINSTELLUN EINSTELLUNGB EINSTELLUNG PUNKT AEGLEICHUNG ABBY
Die Stine 8 und9
kurzschiieflen und
die Spannungsver: 1
Das Sensorteil sci-guns einschalten, VR1
des optischen um den Test-lodus Regelwiderstand des 0.1m
1 LASERLEISTUNG Leistungmeters auf zu aktiviereni Die ALPC-Schaltkreises (a)
die Auinehmerlinse Taste +10 druaken, am Tonabnehmer '
ansetzen. dann afinet sich (1129-1760-4310
der Triger. Lllld die
LD gibt Licht ausi
Die Stine 8 und 9
kurzschlieBen und
die Spannunxsver- Stromwert + 5.5mA
BETRIEBSSTROM DES Stift 1 Von 0N1 son-sung einschaiten. auf dem Laserlonair
LASERTONABIIEHMERS entiernen und das um den Test-Modus nehmer markiert.
2 (Nur wenn der - Gleichstrom Ampermeter zu akiiviereni Die 7 Van der Strcm 40M (1))
Tonabnehmer defekt ansehliefleni Taste +10 driicken, oder mehg uber dem
zu sein scheint) (11294760410) dann fiffnet sich obigen Wei-t liegt,
der Trager, und die ist er defekti
LD sibt Licht susi
FOKUS-
FOKUS- Ein oszilloskop an PEHLERAUSGLEICK
3 FEHLERAUSGLEICH Testdise TP(RF) anschiieflen. PLAY VR3 0ptima1es Ausenmuster (c)
(us-293241) (ms-293241)
Schraube an der
Ein oszilloskop an rechten Seite des
4 TANGENTIAL Tesldisc TP(RE) anschlieBen. PLAY Mechanisms Optimales Augenmuster (C)
(AbbJA)
OPTISCHES Testdisc Ein oszilloskop an Die Spannungsveri Einsiellfiifnunz Maxima1-Amp1itude
GITTBR (l) TP(TE) anschlieflen, sorzung einsehalten, unten am Laser (Siehe Photo 1 und 2.)
(X25-2932-71) wahrend die Stiite Tonabnehmer
8 und 9 kurzgesehv (Abbi!)
lessen warden, um
den Mikrocomputer
in die Testifietrieb-
5 sart zu versetzeni
Die PLAYTaste m (d)
1 bis 2 Minuten dril-
cken, um den Tile]
Mr. 1 Zn suchen.
Dann die CHECK-Taste
drueken. um den
Sputhalte-Servo
auf Off zu stellen.
Die CLEARTaste
druaken. um den
Spurhalteservo auf Einstellungsfifinung
0N einzustellen. an der Unterseite Uberpruien, daB das
OPTISCHES Ein Oszilloskop an Mini-end sich der des Laser Augenmuster richtig
6 GITTER (2) Testdisc TP(RF) anschlieBen. Mikrocomputer in tonabnehmers ausgegeben wird. (c)
" Uberpruiung der (HE-293241) Testbetriebsart (Abb.B)
Palm-it i. " befindet.
(Der Vorschubservo
steht auf OFFi)
OPTISCHES
GITTER (3) Einstellungsbffnung Uberprufen, daB sie
" Uberprufen. daB TP(RF) auslbsen und an der Unterseite Photo 3 entsprechen.
7 die Nebenstraflen Testdisc ein Oszilloskop an PLAY des Laser' *Photo 4 zeigl das (e)
auf der TP(SUE) anschlieBen. tonabnehmers Beispiel eines
selben Spur (11257293241) (Abb,B) defekten Tonahnehmers,

erseheinen. '

J" Q

ABGLEICH

_ EINGANGS- AUSGANGS- SPIELER- ABGLEICIF
NR1 GEGENSTAND El NSTELLUNG EI NSTELLUNG E I NSTELLUNG PUNKT ABGLEI CHUNG M35.
in der
. Bin Oszilloskop Testbetriebsart V Symmetrie zwischen
SPURHALTEFEHLER Oder ein Gleizhstronr die CHECK-Taste TE BALANCE oberen und unteren
8 AUSGLEICH Testdisc Voltmeter an TP(TE) drueken, um den VR2 Hustern oder (d)
anschliefien. Spurhalteservo auf (1125»2932-71) Gleichstrom
(X252932-71) OFF zu steilen. DC=0 t0,05V
50mVrms
Testdisc: LPF mit 47kohm. 410pF *Das ist 1/10 der
Ein 1kHz. 0.5Vrms an Stift 1 Von CN'I an FOKUSVERSTARKUNG Binsanzs spannuns
9 FOKUSVERSTARKUNG Signal an Stift 2 X25-29327'll und PLAY V114 (Bei Verwendung eine (0
von CN'I an Platine ein Oszilloskop oder (X25-2932-71) Oszilloskop nur die
572932-71 lechselstrom-Voltmeter lki-Iz Komponente
anlegeni anschliefien. uberprllfen.)
BOmVrms
Testdise: LPF nit kohm. 47091 *Das is! 1/10 der
Ein lkliz. 0,5Vrms an Stift 5 Von an SPURHALTE- Einganzs spannunx
10 SPURHALTB- Signal an SH 4 X25293271 und PLAY VERSTAREKUNG (Eei Verwenduns eine (f)
VERSTAREKUNG von C117 an platine ein Oszilloskop oder V115 Oszilloskop nur die
1125-2932771 Wechselstroonltmeter 0257293241) 1sz Komponente
anlegeni anschlieflen. uberprufen.)
Einen Frequenzz hler HALT
an TP(PLCK) Die Auschiiisse P.ADJ. Frequenz ADJ.
11 PLL anschlieflen. PLCK und F.TEST vm 4.411112 tonsuuz (x)

(x25-2932-11)

kurzschl ieBen.

0125493241)

_:E-I{\ :21

'9-

'L-qrsz-l MN

Disc-Tréiger

-H
g
m

H

Vorne

\

Abb. A : Mechanismus-Baugruppe (Draufsicht)

TANGENTIAL

OPTISCHES
GITTER (1)

LaserAbnehmer

O @001-

O
o o

Vorne

Abb. B : Mechanismus-Baugruppe (Unteransicht)

59