Kenwood DP-M87 User manual

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KENWOOD
SERVICE MANUAL
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Metallic cabinet Panel (Tray) Panel (Front)
{A01-3079-11) (A29-0351-02) : (A60-0447-12)
some aus
Ber caed Pasta er
Foot (Front) - Escutcheon Front glass
{J02-1040-05) (BO07-2249-03) (B10-1984-03)
Cord with connector
(E30-2631-15)
Rectangular receptacle (System control) "Phono jack (Line out) Foot (Rear)
(E08-0312-05) (E63-0068-15) (J02-0366-15)
+
This service manual is available of changing information from serial No. 31240001.
Refer to DP-MA5/MA9 service manual (B51-4588-00), if need description in detail.
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DP-M87
CONTENTS/ACCESSORIES
CONTENTS
ACCESSORIES si sssisieccecsseeelccdvscetsccdstcsisdeestariaseiasacnts 2 PC BOARD (COMPONENT SIDE VIEW) ................ 13
CIRCUIT DESCRIPTION SCHEMATIC DIAGRAN ............::cccccccscssestscsetsserseees 15
Ai TOSE MOC secs civics ook satan leceadeca cake gescagssoestiecect 3 EXPLODED VIEW
2. Microprocessor : SC75217GF-642 (IC6).......... 5 MECHANISM .............ccccccccssseecscensneesnseserteatenesses 19
3. Servo IC : CXA1782BQ (1C1) ue eee ceeeeeeees 7 NDING oss.ccse sith ptistsscctaceeabeetacsch evi sateen tuscnasveaians 23
4. Digital Signal Processor : CXD25170Q (IC2) ....9 PARTS. LIST ecazisesictsaeedseeslitasecsielivagevi levecsetncavvei toacens 25
ADJUSTMENT ..........:cceceeseeeseeenseeeseesseteesssesenesseseees 11 SPECIFICATIONS ............:ccccseceeteeseees BACK COVER
NOTE : Refer to DP-MA5/MA9 service manual (B51-4588-00), if need description in detail.
ACCESSORIES Magazine is packed with the CD player.
« Antenna adaptor
(T90-0185-05) : 75Q / 300Q
T,E type only
* Loop antenna stan
(J19-2815-04)
+ Magazine
(J19-3394-13)
+ AM foop antenna
(T90-0174-05)
*FM indoor antenna
(T90-0175-05)
* System control cords
(E30-2627-05)
(E30-2628-05)
+ AC plug adaptor
(E03-0115-05) : M type only
* Audio cords
(E30-0505-05)
(E30-0615-05)
For the unit with a European
AC plug in areas other than Europe.
* Battery (AAA/RO3) « Remote control unit
(-) (X94-1011-41 : RC-77M) K-77M / 88M, MIDI M-57M / M-77M
Battery cover (A09-0126-03) K-77M / 88M, MIDI M-57M / M-77M
Battery cover (F07-0721-23) K-99M, MIDI M-97M
For M,X type
System name Amp Tuner __ [Cassette deck
K-T7M AS? 116 X57
KcBaM ATI 776
K-99M A-87 T-76
X-87 DP-M87 GE-970
For E,T type
System name
MIDI M-57M
Cassette deck CD player Graphic equalizer (option)
LS-56
MIDI M-77M
LS-76
MIDI M-97M
LS-97

CIRCUIT DESCRIPTION
1. Test Mode
Setting the test mode
This microprocessor built in this unit (X32-) can be
put to TEST MODE by just short-circuiting the test
pins (#2 and #8).
(1) Focusing servo
(2) Tracking servo
(3) Feed servo
REPEAT (1) Laser (In STOP mode only)
(1) Focusing servo
RANDOM (2) Tracking servo
(3) Feed servo
(1) Focusing servo
(2) Tracking servo
(3) Feed servo
(1) Focusing servo
(2) Tracking servo
(3) Feed servo
Load No.1 disc to No.6 in order.
Read the TOC (table of contents) of disc
No.3 to No.6 in order.
TEST mode is cancelled after reading the
TOC of No.6 disc, and then playback the
1st track.
DP-M87
23 4 5
7 8 9
12 13 14
16 17 18 19

DISC 3 ~6
DISC P
Load the decided No. disc which is pre-
ssed by the key and set to STOP mode.
ex. Disc No.4 key is pressed (PLAY,
CHECK and CLEAR keys are available to
operate).
Turns all FL display lamps ON.
play p oc = G :
Lt tu
Turns all FL display lamps OFF.
"DISC" and "1 ~ 6" are not off because
circuit is static operation.
(1) Door opens.
(2) P1 tray come out. Press "EDIT" key,
"PLAY MODE".
in the STOP mode, moves the pickup
slightly toward the outer position of disc.
In the STOP mode, moves the pickup
slightly toward the inner position of disc.
High-speed playback CHECK mode (in
stop mode only) playback P1 disc in high-
speed mode. If press "SPACE" key,
change to normal mode.
In this mode, all keys are available.
REPEAT SINGLE
t
{
oa
Lt

DP-M87
CIRCUIT DESCRIPTION
2. Microprocessor : S$C75217GF-642 (IC6)
2-1. Pin connection diagram
xe)
»
2WQD2ldI3°
14
Zv9-ADLLZSLOS
(OAY3S)
DEZBLLVXD
(dSQ)
OLLSZGXD
OMS 3WOH
4,SSV
WSINVHO3W
MS
S19
MS
N3dO0
MS
AVOTD

DP-M87
CIRCUIT DESCRIPTION
2-2. Pin functions : $C75217GF-642 (IC6) 2-3. Pin functions : TC74HC165AP (IC3)
Function
Reset input port
FL grid control port
Not used
Shif load input
Clock input
Magazine switch (SW4)
Memory switch (SW3)
Unload switch (SW5)
Load switch (SW5)
No use
Ground
Data output
No use
Home position switch (SW2)
Start limit switch (SW1)
3
HT
orbs
omit
a)
——
14 |OPNSW Tray open switch (SW6)
- No use
FOK Vec Power supply (+5V)
MUTG 2-4. TOC data output of serial codes for Al file
When the CD player reads the TOC data of a disc (in
the play mode), the following serial codes (16 bits) are
DATA output.
eae ¢ CD MAX TRACK No. [61XX]
MOd6l C606 x. xciossiinciciePincasaeiiadaes 61H
FUNCTION COE 0.0... ..eceecceceeeccsseeeeneaes XXH (Max TNO)
¢ CD TOTAL TIME (min.) [62XX]
Model code ou... sees 62H
SDATA Serial DATA in/out port Function code .........0000 XXH (Total time in min.)
VO | Serial BUSY in/out port ¢ CD TOTAL TIME (sec.) [62XX]
49 Door switch input port of mechanism Model code uo... 63H
Control port of unloading motor for mechanism FUNCTION COdE ........e cece XXH (Total time in sec.)
Control port of up motor for mechanism
Control port of down motor for mechanism Example
Control port of solenoid for mechanism When a disc containing 20 tunes of 65 minutes and
2 seconds in total is played, the following three codes
{6120}, [6265] and [6302] are output continuously.
FL driver negative power supply
FL pre-driver power supply
FL grid contro! port also used for key-scan
+5V power supply
FL grid contro! port also used for key-scan
Signal detection port for SENSE signal
from signal processor and servo IC
Q-data read clock output port
Q-data input port 33
4
5
6
7
8
9
1
2
3
4
5
6
7
8
3
3
3
3
3
3
4
4
4
4
4
4
4
4
GND
NC (Open)
Key input port

DP-M87
CIRCUIT DESCRIPTION
3. Servo IC : CXA1782BQ (IC1)
3-1. Block diagram
el IL DATA REGISTER *INPUT SHIFT REGISTER
*ADRESS. DECODER
TZ2C COMP
44 OFCT
ei ™1
q sel «WINDOW COMP. ae 9
a f\
*FCS PHASE COMPENSATION
O
OFCT

DP-M87
CIRCUIT DESCRIPTION
3-2. Pin function
Pin name Function
FEO Focus error amplifier output. Connected internally to FZC comparator input.
FEI Focus error input.
FDFCT Capacitor connection pin for detect time constant.
Ground this pin through a capacitor when decreasing the focus servo high-frequency gain.
External time constant setting pin for increasing the focus servo low-frequency.
— Focus drive-output— —— a =
Focus amplifier negative input pin.
External time constant setting pin for generating focus servo waveform.
External time constant setting pin for switching tracking high-frequeny gain.
High cut off frequency setting pin for focus and tracking phase compensation amplifier.
Tracking amplifier negative input pin.
Tracking drive output.
Feed amplifier non-inversed input.
Feed amplifier negative input pin.
Feed drive output.
Setting pin for focus search, track jump, and feed kick current.
Serial data transfer clock input from CPU (no pull up resistance).
Latch input from CPU (no pull up resistance).
Reset input; resets at low (no pull up resistance).
Track number count signal output.
Outputs FZC, DFCT, TZC gain, balance and others according to the command from CPU.
Focus OK comparator output (DC voltage : 10kQ load resistance is connected).
Input pin for the DEFECT bottom hold output capacitance-coupled.
1
O | RF summing amplifier output. Eye pattern check point.
RF summing amplifier inversed input.
The RF amplifier gain is determined by the resistance connected between this pin and RFO pin.
LD O ; APC amplifier output.
PHD APC amplifier input.
PHD1, PHD2 RF I-V amplifier inversed input. Connect these pins to the photo diode A+C and B+D pins.
FE-BIAS Bias adjustment of focus error amplifier.
F,E F I-V and E I-V amplifier inversed input. Connect these pins to photo diodes F and E.
El |-V amplifier E gain adjustment (when not using automatic balance adjustment).
VEE
TEO Tracking error amplifier output. E-F signal is output.
LPFI Comparator input for balance adjustment (input from TEO through L.P.F.).
3
3
| TEI Tracking error input.
ATSC Window comparator input for ATSC detection.
TZC Tracking zero-cross comparator input.
TDFCT Capaitor connection pin for defect time constant.
VC (Vcc+Vee) / 2 DC voltage output.

4. Digital Signal Processor :
4-1. Block diagram
No.
4-2. Pin function
Pin name
DP-M87
CIRCUIT DESCRIPTION
CXD25170 (IC2)
Digital
cLV aa
Mop
MON
corrector
sack
saso
EXCK
s@so
SCOR
CPU XLON
aa interface SPOA~O
ined pais
xLaT
DATA
9} SENS
cLKO
Servo auto XLTO
Asymmetry sequencer
corrector pare
RF
ASYI ASYO ASYE
BIAS
Function
FOK
Focus OK input. Used for SENS output and the servo auto sequencer.
2
MON
Disc motor ON/OFF control output.
3,4
|
MDP, MDS
Disc motor servo clock.
5
LOCK
GFS is sampled at 460Hz; when GFS is high, this pin outputs a high signal.
If GFS is low eight consecutive samples, this pin outputs low.
TEST
Test pin (normally GND).
FILO
Master PLL (slave=digita! PLL) filter output.
FILI
Master PLL filter input.
9
[ PCO
Master PLL charge pump output.
10
Vss
GND
11
__| Avss
i GND (analog)
12
CLTV
Master VCO control voltage input.
13
AVbD
Analog power supply (+5V).
14
RF
EFM signal input.
15
BIAS
Constant current input of asymmetry circuit.

CIRCUIT DESCRIPTION
Pin name Function
ASYI
ASYO
ASYE
WDCK
LRCK
PCMD
BCK
GTOP
XUGF
XPCK
VpD
GFS
RFCK
C2PO
XROF
MNTS, 1, 0
XTAI
XTAO ,
36 XTSL Crystal selection input. Set low when the crystal is 16.9344MHz, high when 33.8688MHz.
37 FSTT : 2/3 frequency divider output for pins 34 and 35.
1
38 C4M 1; 4.2336MHz output.
39 DOUT ti Digital-out output.
40 EMPH 1, Outputs high signal when the playback disc has emphasis, low signal when no emphasis.
4 WEFCK 1, WEFCK output.
45 EXCK SBSO read-out clock input.
48 MUTE High : mute, low : release
{0 | 1,0 | SENS output to CPU.
XRST System reset. Reset when low.
DATA Serial data input from CPU.
XLAT Latch input from CPU. Serial data is latched the falling edge.
CLOK Serial data transfer clock input from CPU.
SEIN Sense input from SSP.
CNIN Track jump count signal input.
DATO ; Serial data output to SSP.
XLTO ; Serial data latch output to SSP. Latched at the falling edge.
VoD Power supply (+5V).
CLKO ‘ Serial data transfer clock output to SSP.
SPOA ~ SPOD L-com extended interface (input A ~ D).
XLO ; : u-com extended interface (output).
Asymmetry comparator volatge input.
EFM full-swing output (low=Vss, high=Vpb).
Low : asymmetrycircuitoff, high : asymmetry circuit on.
D/A interface. Word clock f=2Fs.
D/A interface. LR clock f=Fs.
D/A interface. Serial data (two's complement, MSB first).
D/A interface. Bit clock.
GTOP output.
XUGF output.
XPLCK output.
Power supply (+5V).
| GFS output.
RFCK output.
C2PO output.
XRAOF output.
MNT 3, MNT 1, MNT 0 output.
16.9344MHz crystal oscillation circuit input, or 33.8688MHz input.
16.9344MHz crystal oscillation circuit output.
1
OLO/O}O}O;Oj;O}—]|O}—
—{|O}—-|/O/O/}O;O}O
—jO}|O O/OJ/O;O}O
—/O
Notes ¢ PCMD is two's complement output of MSB first.
¢ GTOP is used to monitor the frame sync protection status.
* XUGF is the negative pulse for the frame sync derived from the EFM signal. It is the signal before sync protection.
e XPLCK is the inverse of EFM PLL clock. The PLL is designed so that the falling edge and the EFM signal transition point coincide.
* GFS goes high when the frame sync and the insertion protection timing match.
e RFCK is derived from the crystal accuracy. This signal has cycle of 136u.
* C2PO represents the data error status.
¢ XRAOF is generated when the 16K RAM exceeds the +4F jitter margin.