The MECHANISM OPERATION DESCRIPTION is the same as model KDC-S3007 and KDC-5050RG.
Please refer to the service manual for model KDC-S3007(B51-7029-00) or KDC-5050RG(B51-7099-00).
DC cord
(E30-4944-05): KDC-5090BY
(E30-4958-05): KDC-5090B
PARTS LIST........................................................................... 27
SPECIFICATIONS............................................... BACK COVER
2
PLL+B
FM+B
Q45,47
Q46,48
AM+B
DIMMER
MUTE
2WAY
DET.
ACC
BU DET.
A8V
A8V
Q14,15
Q16,17
Q19-22
SERVO AVR
Q18
SERVO+B
SW5V
Q13
Q55,56
Q33
Q11,12
SW5V
BU5V
BU5V
P CON
Q27,29
Q30,32
MUTE
IC3
Q7
DRIVER
MUTE
Q1,2,5,6
POWER IC
IC4
u-COM
CD
CH
F/E
A1
E-VOL
IC2
PRE OUT
SP-OUT
DIMMER
TEL-MUTE
ACC
ANT-CONT
P-CONT
DECODER
RDS
IC1
IC7
Q51
ILLUM
+B
BUFFER
NOISE
Q43
PRE OUT OUTPUT VOLTAGE
Q26
Q34
NAVI-MUTE
PANEL 5V
PANEL 5V
SW14V
PANEL
POSITION
DET.
CH
QUAL
SERVO+B
MUTE R
STOP
SW2
LO/EJ
MUTE L
RST
SW3
SW1
SDA
SCL
A8V
BU5V
SW5V
RST
REQ C
CLK
CH-CON
DATA H
REQ H
CD
AM
FM
P MUTE
MUTE
SW5V
PANEL5V
ILL+B
SRT-SW1
SRT-SW2
RDCK
RDDA
QUAL
SDA
SCL
AFS
AFS
A8V
PLL DATA
PLL CLK
IFC OUT
S-METER
SW5V
DATA C
BACK UP
BU5V
CHANGER
AM
FM
230mV
1200mV
1200mV
251mV
AUDIO OUT
FM+B
NOISE
CD
MODEL
3600mV
3600mV
855mV
1372mV
LEVEL
MO SW
BACK UP
BU5V
RESET IC
IC8
MATRIX
KEY
L DATAL
L CE
L CLK/PANEL
DIMMER
REMO
PAN5V
RESET
DRIVER
MUTE
LCD DRIVER
IC1
IC2
Q5
Q55,56
Q3,4
ED1
SW
RESET
LCD
(BACK LIGHT WLED)
DIMMER
PWM CONTROL
REMO
G/R SW
LCD AVR
PANEL 5V
(X13- )
,42
PAN 5V
SW
BLOCK DIAGRAM
KDC-5090B/BY
3
KDC-5090B/BY
COMPONENT DESCRIPTION
●SWITCH UNIT (X13-99XX-X4)
Ref. No.
IC1LC75808WLCD driver with the key matrix
IC2RS-171Remote sensor IC
Q1DTA114EUA or KRA302Key-permission SWFor the key scanning start
Q32SD2114KRed LED SWWhen a base goes Hi, RED LEDs are turned on.
Q42SD2114KGreen LED SWWhen a base goes Hi, GREEN LEDs are turned on.
Q52SC2412K or 2SD601AVLCD AVR
Q6DTA114EUA or KRA302REMO SW
Q7DTC143ZKDimmer SW
●ELECTRIC UNIT (X25-87X2-7X)
Ref. No.
IC1UPD703033GC117
IC2TDA7407DE.VOL & N.C.MPX IC
IC3
IC4TA8263BHPower AMP. IC
IC7TDA7479DRDS decoder
IC8S-80837ANNPReset ICWhen BU 5V voltage is less than 3.7V, IC outputs Lo.
Q1DTC143TUA or KRC410Pre mute (Front L)When Q1’s base goes Hi, Pre-output is muted.
Q2DTC143TUA or KRC410Pre mute (Front R)When Q2’s base goes Hi, Pre-output is muted.
Q5DTC143TUA or KRC410Pre mute (Rear L)When Q5’s base goes Hi, Pre-output is muted.
Q6DTC143TUA or KRC410Pre mute (Rear R)When Q6’s base goes Hi, Pre-output is muted.
Q7DTA124EUA or KRA303Mute driver
Q112SC4081 or 2SD1819A
Q122SB1548(P)Q11 and Q12 are inverted Darlington connection.
Q132SA1576A or 2SB1218ASW 5V
Q142SC4081 or 2SD1819A
Q152SB1548(P)
Q16DTC124EUA or UN5212
Q17DTA124EUA or KRA303
Q182SD2375SERVO +B AVRWhen Q18’s base goes Hi, SERVO +B AVR outputs 8V.
Q19DTC124EUA or UN5212
While a base goes Lo, PAN 5V is supplied to the Remote
sensor IC.
Usually Q7’s base goes Hi. When DIMMER mode is
selected, pulse wave shape is applied to Q7’s base.
When BU detection SW or System RESET or MI-COM.’s
Pre-mute is working, a base goes Lo, and Q7 is turned on.
BU 5V AVR
A8V AVRWhen Q14’s base goes Hi, A8V AVR outputs 8V.
SW14V SWWhile Q16’s base goes Hi, Q17 is turned on, A8V AVR and
ILL +B SWWhile Q19’s base goes Hi, Q20 is turned on, and ILL +B
While BACKUP is applied, AVR outputs +5V.
While a base goes Lo, SW 5V is supplied to the
microprocessor peripheral circuits.
A8V AVR and SERVO +B AVR ON/OFF control
SERVO +B AVR are working.
ILL +B AVR ON/OFF control
AVR is working.
4
KDC-5090B/BY
COMPONENT DESCRIPTION
Ref. No.
Q212SB1184
Q222SC4081 or 2SD1819A
Q26DTC144EUA or UN5213Small lamp detection SWWhen vehicle small lamps turn on, Q26 is turned on .
Q27DTC114YUA or UN5214
Q322SB1277(Q,R)Works during POWER ON mode.
Q29DTA124EUA or KRA303P-CON. protection inhibit SWPrevents Q30 tuning ON during start-up after power ON.
Q302SA1576A or 2SB1218AP-CON. protection SWProtect Q32 by turning ON when P-CON output is grounded.
Q332SC4081 or 2SD1819ABU detection SWturned on. When momentary power down has detected,
Q342SC4081 or 2SD1819AACC detection SWWhile ACC is applied, a base goes Hi, and Q34 is turned on.
Q42DTC124EUA or UN5212E. VOL mute SW
Q432SC4081 or 2SD1819ANoise buffer
Q45DTC124EUA or UN5212
Q472SB1277(Q,R)Works during FM reception mode.
Q46DTC124EUA or UN5212
Q482SB1277(Q,R)Works during AM reception mode.
Q51DTC144EUA or UN5213IFC bufferWaveform shaping
Q522SC4081 or 2SD1819AComposite signal output buffer
Q552SA1576A or 2SB1218A
Q56DTC124EUA or UN5212and Q55 is turned on.
Generation of RF signal based on the signals from the APC
circuit and pickup, and generation of servo error (focusing
Detection of dropout, anti-shock, track crossing and off-track
conditions, Gain control function building in.
Focusing coil, tracking coil, spindle motor and sled motor driver
When CD source is selected, Q2’s base goes Hi, Q3 and
Q4 are turned on.
A8V ON/OFF control. When a base goes Lo, Q3 is turnde on.
D5V ON/OFF control. When a base goes Lo, Q4 is turnde on.
When CD loading or eject operation is activating, Q5’s base
goes Hi, Q4 is turned on.
5
KDC-5090B/BY
MICROCOMPUTER’S TERMINAL DESCRIPTION
IC1 (ELECTRIC UNIT : X25-87X2-7X)
Pin No.Pin NameI/ODescriptionProcessing Operation
1AM+BOAM+B controlHi : During AM reception
2FM+BOFM+B control
3AFSO
4PLL-DATAI/OData input/output with F/E
5PLL-CLKI/OClock input/output with F/E
6EVDD-Positive power supply connection terminalConnected to BU 5V lines.
7EVSS-Ground connection terminalConnected to GND lines.
8NCONot used (N.C.)
9BEEPOBEEP sound output
10REMOI
11CH-REQHORequest output to changersLo : Request
12CH-RSTOReset output to changers : Reset
13IC2-SDAI/O
14IC2-CLKI/O
15CH-MUTEIMute request from changersHi : Mute request
16CH-CONOChanger controlHi : Operation mode, Lo : Standby mode
17
18TEST-Test terminalNot used (Connected to GND lines)
19P-MUTEOPower IC mute control outputLo : Mute (POWER OFF, TEL MUTE)
20P-STBYOPower IC standby control output
21MUTEOIC2 mute control outputHi : Mute on
22NCONot used (N.C.)
23PRE-MUTEOPre-outputs mute control outputLo : Mute
24ACC-DETIACC detection inputHi : ACC OFF, Lo : ACC ON
25DIMMERISmall lights detection inputLo : During vehicle small lamps turn on.
26SW5VOSW 5V control output
27
28P-CONOPower control outputHi : POWER ON mode except ALL OFF mode.
29ANT-CONOAntenna control outputHi : During FM/AM reception or TI reception.
30P-ONOSW 14V control output
31RESETIReset input terminalLo : System reset
32XT1ISub clock resonator connection terminalClock count during POWER OFF mode
33XT2-Sub clock resonator connection terminal
34REGC-C terminal
35X2-Main clock resonator connection terminal
36X1IMain clock resonator connection terminal
37VSS-Ground connection terminalConnected to GND lines.
38VDD-Positive power supply connection terminalConnected to BU 5V lines.
39CLKOUTOInternal system clock outputNot used (N.C.)
40,41NCONot used (N.C.)
42~45
46IC2TYPE0IIC2 setting terminalLo : Initial value
47IC2TYPE1IIC2 setting terminalLo : Initial value
6
DIMMER-CON
EXT-AMP-CON
TYPE0~TYPE3
Noise detection time constant switching terminal
Data input from the remote control light sensor
Data line with IC2, IC5 and CD MECHA. MI-COM.
Clock line with IC2, IC5 and CD MECHA. MI-COM.
ODimmer control outputPulse wave shape : DIMMER mode, Hi : POWER ON
OExternal amp. control outputBass boost LOW__Hi : 130msec, Lo : 70msec
IDestination type input terminal 0~3
Hi : During FM reception, Hi : Last FM mode (only RDS model)
Hi : During FM reception, Lo : During FM seek or AF search
Hi : POWER ON mode except panel detached or panel mask position
Lo : POWER ON mode or during CD loading/eject action.
Bass boost OFF__Hi : 160msec, Lo : 40msec
Bass boost HI__ Hi : 100msec, Lo : 100msec
Hi : POWER ON mode or during CD loading/eject action
Oscillation stop : POWER OFF mode or momentary
power down detected
KDC-5090B/BY
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No.Pin NameI/ODescriptionProcessing Operation
48~51NCONot used (N.C.)
52ILL-ONOIllumination AVR on/off control output
53M-MUTE LI
54M-MUTE RI
55BVDD-Positive power supply connection terminalConnected to BU 5V lines.
56BVSS-Ground connection terminalConnected to GND lines.
57M-RSTOReset output to CD MECHA. MI-COM.Lo : Reset
58M-STOPOStop request to CD MECHA. MI-COM.Lo: Stop mode, Hi : Operation mode
59NCONot used (N.C.)
60LO/EJI/OCD MECHA. loading/Eject switching outputLo : Loading, Hi : Eject, Hi-Z : Stop or Break
61MOSWOCD mechanism loading motor control outputHi : CD loading/eject action or Break, Lo : other
62NCONot used (N.C.)
63CD-SW3IDown & limit switch detection inputHi : Chucking, Lo : Pickup most inner position
64NCONot used (N.C.)
65L-CEI/OCE output to LCD driver
66~69NCONot used (N.C.)
70AVCONTO
71AVDD72AVSS73AVREFI
74PHONEIPHONE detection input
75,76NC (GND)INot used (pull down to GND lines)
77SRT-SW2ISRT position detection input
78SRT-SW1ISRT position detection inputMask : (SW1, SW2) = (Lo, Lo)
79NOISEIFM noise detection input
80S-METERIS-meter input from F/E
81R-DATAIData input from the RDS decoder ICExcept RDS model : Not used (pull down to GND lines)
82R-QUALIQuality input from the RDS decoder ICExcept RDS model : Not used (pull down to GND lines)
83IFC-OUTI F/E IFC OUT input terminalHi : Station detected, Lo : Not detected
84,85NC (GND)INot used (pull down to GND lines)
86NCONot used (N.C.)
87R-CLKIClock input from the RDS decoder ICExcept RDS model : Not used (pull down to GND lines)
88CH-REQCIRequest input from changersLo : Request
89KEY-REQI
90CD-SW1ILoading detectionLo : CD chucking.
91CD-SW2I12cm disc detection terminal
92NCONot used (N.C.)
93BU-DETIMomentary power down detection input
94CH-DATACIData input from changers
95CH-DATAHOData output to changers
96CH-CLKI/OClock input/output with changers
97L-DATALIData input from the LCD driver IC
98L-DATASI/OData output to the LCD driver IC
99L-CLKI/O
100PAN5VOPanel 5V controlHi : Panel attached, Lo : Panel detached
Mute request (Lch) from CD MECHA. MI-COM.
Mute request (Rch) from CD MECHA. MI-COM.
A/D converter reference voltage control output
A/D converter positive power supply connection terminal
A/D, D/A converter ground connection terminal
A/D converter reference voltage input terminal
Communication request input form LCD driver IC
Clock output to the LCD driver IC
/Panel detaching detection input (LCD Driver)
Hi : POWER ON mode except panel detached or panel mask position
Lo : Mute request
Lo : Mute request
Hi : Active, Connected to AVREF terminal.
Connected to BU 5V lines.
Connected to GND lines.
1V or less : TEL MUTE, 2.5V or greater : NAVI MUTE
When 12cm disc was detected, the input becomes Lo temporarily.
Hi : When momentary power down detected or BU OFF, Lo : BU ON
Lo : Panel attached
7
KDC-5090B/BY
TEST MODE
1. How to enter the test mode
While holding the FM and Preset 6 keys, reset the unit.
2. How to exit from the test mode
While holding the Preset 6 key, reset the unit.
(Note) The test mode cannot be terminated by ACC OFF,
power OFF or momentary power down.
3. Initial status in the test mode
• Sources: ALL OFF
• Display: All segments are lit.
• Volume: –10dB (displayed as “30”)
• Loudness: OFF
• CRSC: OFF regardless of the presence of switch-
ing function.
• SYSTEM Q : Flat
4. Special display in Tuner mode
When any of the following messages is displayed in Tuner
mode, the F/E may be abnormal.
•“TNE2P NG” : The EEPROM is set to the default (unstable values) because the F/E was shipped without passing through the adjustment process, etc.
•“TNCON NG” : Communication with the F/E is not possible.
5. Forced switching of K3I
Each press of the Preset 6 key in Tuner mode should switch
K3I from AUTO → Forced Wide → Forced Middle → Forced
Narrow → AUTO.
The initial status is AUTO and the display shows these
modes as follows.
• AUTO: FMA
• Forced Wide: FMW
• Forced Middle : FMM
• Forced Narrow : FMN
6. Test mode specifications of the CD receiver
• Forced ejection is inhibited in the reset start operation.
When the unit is reset while a CD is loaded in it, the CD is
not recognized by resetting.
• Each press of the Track Up key jumps to the following
track numbers:
No. 9 → No. 15 → No. 10 → No. 11 → No. 12 → No. 13
→ No. 14 → No. 9 (The cycle restarts from here.)
• Each press of the Track Down key jumps to the previous
track number to the track being played.
7. Audio-related specifications
• A short press of the Q key initiates the audio adjustment
mode.
• Pressing the ✽ key on the remote initiates the audio ad-
justment mode.
• Continuous holding of a remote control key is inhibited.
• Bass, Middle and Treble are adjusted in 3 steps of Min /
Center / Max with the Track Up/Down keys.
• Balance is adjusted in 3 steps of Left Max / Center / Right
Max with the Track Up/Down keys.
• Fader is adjusted in 3 steps of Rear Max / Center / Front
Max with the Track Up/Down keys.
• HPF is adjusted in 2 steps of Through/220Hz with the
Track Up/Down keys.
• LPF is adjusted in 2 steps of Through/120Hz with the
Track Up/Down keys.
• Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble
f are not dealt with by the audio adjustment.
8. Menu-related specifications
• A short press of the CLK key initiates the Menu mode.
• Pressing the DNPP/SBF key on the remote initiates the
Menu mode.
• Continuous holding of a remote control key is inhibited.
• Contrast is adjusted in 3 steps of 0/5/10 and the default is
5.
9. Backup current measurement
When the unit is reset while ACC is OFF (i.e. by turning
Backup ON), the MUTE terminal goes OFF in 2 seconds in
place of 15 second. (The panel and CD mechanism are
not activated at this time.)
8
TEST MODE
KDC-5090B/BY
10. Special display when the display is all on
Pressing the Preset keys while the power is ALL OFF displays the following information.
[PRESET 1] Version display (8 digits, Month/Day/Hour/Minute)
(Display) SYS xxxxxxxx System microcomputer
[PRESET 3] Short press : View power ON time. (The All OFF
period is not counted.)
Long press/hold : Clear power ON time.
(Display) PonTim xxxxx Max. 65535 (hours)
[PRESET 4] Short press : Display CD operation time.
Long press/hold : Clear CD operation time
(Display) CDTime xxxxx (CD/R) Max. 65535 (hours)
[PRESET 5] Short press : Display CD ejection count.
• Messages such as “CODE OFF” are not displayed when
power is turned ON.
• Pressing the TI (AUTO) key during changer operation turns
2zone ON. 2zone can be turned OFF by pressing the TI
(AUTO) key again. The P/S dot lights while 2zone is ON.
• Pressing and holding the CLK key for a second in the ALL
OFF status the Mask Key (security) write mode.
• Security-related information
1. Forced Power ON mode (All models)
Even when the security (Mask key) is approved, resetting
the unit while holding the ATT and Preset 4 keys makes it
possible to turn the power ON for 30 minutes.
After 30 minutes have elapsed, it is not possible to return
to the previous condition unless the unit is reset again.
2. Method of registration of the security code after
EEPROM (Tuner Unit Ass’y) replacement (Code
security model)
1) Enter the test mode. (See 1. How to enter the test mode)
2) Press the CLK key to enter the security registration
mode.
3) Enter the code using the Preset 1/2/3/4 keys.
Example : To enter “3510”
• Press the Preset 1 key 4 times.
• Press the Preset 2 key 6 times.
• Press the Preset 3 key twice.
• Press the Preset 4 key once.
4) Hold down the DISP key for at least 3 seconds and the
message, “RE-ENTER” appears, so once again enter
the code according to Step 3) above.
5) Press and hold the DISP key for 3 seconds until “APPROVED” is displayed.
6) Exit from the test mode. (See 2. How to exit from the
test mode)
(Note) All Clear is not applicable to the security code of
this model.
3. Method of writing the Mask key while the EEPROM
is in the initial status
1) Enter the test mode. (See 1. How to enter the test mode)
2) Press the CLK key to enter the Mask key registration
mode. “TRANSMIT1” should be displayed now. The display at this time should show “< >” in place of “ [ ] ”.
3) Point the Mask key remote toward the light sensor, and
press and hold its key for more than 0.5 second.
4) When “TRANSMIT2” is displayed, press and hold the
key on the Mask key remote for more than 0.5 second
again. The first and second counter codes are not compared at this time.
5) When “APPROVED” is displayed, the write operation is
complete. Now the demonstration mode is initiated and
the test mode is terminated.
(Note) In the same way as previous models, if 30 minutes
have elapsed with no code written, an error occurs
and the power is turned OFF.
9
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