Kenwood KDC-HD942U User manual

SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.
© 2009-3 PRINTED IN JAPAN
B53-0719-00 (N)166
KDC-HD942U
CD RECEIVER
TDF SPARE-PANEL
MAIN UNIT NAME TDF PARTS No. TDF NAME
KDC-HD942U Y33-3110-11 TDF-HD99D
Panel assy
(A64-4777-01)
Mounting hardware assy
(J22-0789-03)
Compact disc
(W01-1723-15)
Remote controller assy (RC-547)
(A70-2085-15)
Battery
(Not supplied)
Escutcheon
(B07-3235-03)
Lever
(D10-7049-04) x2
Screw set
(N99-1757-15)
DC cord
(E30-6428-05)
Carrying case
(W01-1710-05)
Screw set
(N99-1730-35)

2
KDC-HD942U
BLOCK DIAGRAM
BU1.5V
BU3.3V
SW3.3V
DPU1
CD PLAYER UNIT (X32-6260-00)
BOARD
MOTHER
(X34- )
EF
A
C
B
TR COIL
FO COIL
APC
IC2
16.934MHz
CLOCK
IC3
LOADING &
MOTOR
DRIVER
MOTOR
SPINDLE
S2
S1
S3
SLED
MOTOR
DM1
DM2
X3
Q7
RF AMP
SERVO
MP3 DECODER
WMA DECODER
1Mbit SRAM
PROCESSOR
AAC DECODER
+
+
+
+
+
LEVEL
SHIFT
IC5
iPod
IC7
REG
BU3.3 /
AUTHENTICATION
LEVEL
IC6
SHIFT
IC1
u-COM
Q5
SW BU1.5V
IC9
SW3.3V
REG
Q3
SW
CLOCK
9.000MHz
X1
32.768kHz
CLOCK
X2
IC4
INV
Q9
MECHANISM
VREF
12EJE SW
LOS SW
LOE SW
MOTOR
LO/EJ
AGND
TRO
FOO
DMO
FMO
LD
SIGNAL A/B/C/E/F
S.GND
S7.5V
FOO
TRO
DMO
FMO CD DRIVE MUTE
SO
SRAMSTB
SI
BUCK
CCE
CD REQ
MSTOP
BUCK
CCE
REQ
SO
SI
RST
MRST
Lch
Rch
Z DET
MUTE L/R
DGND
DVSS BU1.5V SW1.5V D3.3V
BU5V
PD
VBUS SW
USB+
VBUS OC
USB-
DATA SCD SI
REQ A
MRST
MSTOP
CLK
CD MUTE
REQ M
DATA M
USB D+
USB D-
USB VBUS SW
USB OC
CD LOE LIM SW RVIN1/RVIN2 DVCC3B PON DVSS DVCC3A PWE
CD SO
DSP REQ
CD CLK
CD RST
ZDET IN
CD SRAMSTB
CE
BSIF LRCK
BSIF DATA
BSIF BCK
BSIF GATE
BSIF ST REQ
IPOD SDA
IPOD SCL
AVSS A3.3V LO RO
BSIF ST REQ
BSIF GATE
BSIF DATA
BSIF BCK
BSIF LRCK
G
D
S
FM/AM
CD
MUTE A
MUTE 0,1,2
WININ OFFSET
MUTE A
PW-IC MUTE
DC ERR
MUTE 0,1,2
AUX
CH
STBY
PRE M/SW M
I2C
I2C
V.BUS OC
RST
RST
P.ON ILLUMI
P.ON
P.ON
F. SEL
P.ONSW V.BUS
P.ON PA
L-DICE
SINGLE
DIRANA2
256k-BIT
iTunes TAGGING
FAVORITE
INSTALLER
BACK-UP
I2C
V.BUS OC
USB I/F
SW V.BUS
CORRECTION
ROM
FRONT-END A8V
DSP
E-VOL
PRE OUT
AUX IN
IC451
BU
u-COM
P-CON
ANT-CON
ACC DET
ILLUMI
BU5V
ILLUMI+B
A8V
P. CON
ANT CON
ILLUMI
ACC
BACK UP
LINE MUTE
SP OUT
(FL/FR/RL/RR)
LCD with DRIVERLED
BU5V
A8V
ILLUMI+B
ILLUMI+B
(F/R/SW)
WIRED REMOTE
LINE MUTE
USB5V
to USB u-COM
USB I/F
BU
USB
PAN5V
IC1
IC602
IC500
SERVO+B
PAN5V
SW
(D5V)
DC/DCHI-SIDE
SW
USB5V
DET
BU/SURGE
SW
SRC
KEY MATRIX
KEY
ROM
CORRECTION
LED SW
LCD+B
u-COM
PANEL
LEVEL
SHIFT
AUTHENTICATION
iPod
SYSTEM
BU3.3V
BU5V Q121,122
Q141-144
Q151
D151
Q123
CN201
Q401-406
J421
J401
J1
Q407,408
J431
4V PRE+B
Q350-353
VP
Q41-44
Q31-34
Q21,22
IC11
WH151
LX BUS
P.ON5V
(HD3.3V)
DC/DC
PAN5V
HD3.3V
IC101
HD1.8VHD1.8V
HD1.2VHD1.2V
IC102
RF5VRF5V
IC75
A8V
A5V
A5V
IC10
A8V
DSP 5V
Q145,146
IC61IC211
Q682,683
IC71
SERVO+B
ENCODER
ROTARY
CONTROL
REMOTE
IC3
S1
D3.2V
IC7
IC4
ED1
S6
S1
EJECT
SWSW
RESET
S2
(to X16- )
IC600
PAN5V
A5V IC371
A1
TUN3.3V
TUN1.8V
HD1.2V
E2PROM
IC852
BU3.3V
IC601
E2PROM
P.ON5V
IC851
HD u-COM
PROCESSOR
HD RADIO
SD-RAM
ROM
FLASH
IC1
IC15
IC2
HD3.3V
IC2
SERVO
DSP
MOTOR
DRIVER
etc
MECHA
u-COM
IC1
SERVO+B
BU5V
SW
IC7
Q5
IC5,6
E2PROM
IC4
IC8
BU3.3V
FLIP DET
(to X15- )
RESET
IC
POWER
IC
MUTE
PRE
MUTE
DRIVER
CONNECTOR
4P
BU5V
IC604
RF5V
SWITCH UNIT (X16- )
(X34- )
DISPLAY UNIT (X15- )
PROCESSOR UNIT
(X17- )
(X32- )
CD PLAYER UNIT

3
KDC-HD942U
●ELECTRIC UNIT (X34-6320-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC10 A5V REG Power supply for A5V to DSP.
IC11 AUD8V REF Power Supply Outputs 1.27V.
IC61 D5V & P.ON5V SW REG Power supply for D5V to USB/PANEL and P.ON5V.
IC71 HD3.3V SW REG Power supply for HD3.3V to the front-end and X17.
IC74 BU3.3V REG Power supply for BU3.3V to system μ-com and E2PROM.
IC75 RF5V REG Power supply for RF5V to the front-end.
IC101 HD1.8V REG Power supply for HD1.8V to the front-end.
IC102 HD1.2V REG Power supply for HD1.2V to X17.
IC211 Hi-side SW Detects USB over-current and ON/OFF SW.
IC371 DSP Digital signal processor.
IC451 E-VOL & Source Selecter Controls the sources and volume.
IC500 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC600 Reset IC Outputs Lo (system μ-com is reset) when detection voltage goes below 3.6V.
IC601 E2PROM For the favorite memory, installer memory, back-up memory and ROM collection.
IC602 System μ-COM Controls FM/AM tuner, the changer, CD mechanism, panel, volume and DSP.
IC604 Muting Logic Controls muting logic.
IC851 HD μ-COM Control μ-com for the front-end and HD module.
IC852 E2PROM For iTunes Tagging data.
Q11-13 AUD8V AVR When Q13's base goes ON, A8V AVR outputs 8.0V.
Q21,22 BU5V AVR While back-up is applied, BU5V AVR outputs +5V.
Q31-34 Servo+B When Q34's base goes ON, Servo+B outputs 7.5V.
Q41-44 ILLUMI+B When Q44's base goes ON, AVR outputs 10.5V.
Q61 FREQ CONT SW Changes frequency of IC61. (SW REG)
Q72 FREQ CONT SW Changes frequency of IC71. (SW REG)
Q121 BU DET SW When the base gose Hi, back-up voltage is detected.
Q122 Surge DET SW When the base goes Hi, surge voltage is detected.
Q123 ACC DET SW When the base gose Hi, ACC voltage is detected.
Q141,144 P.CON SW When Q144’s base goes Hi, AVR outputs 14V.
Q142,143 P.CON Protect Protects Q143 by turning on when P.CON output is grounded.
Q145,146 Power ANT SW When Q146’s base goes Hi, power antenna switch outputs 14V.
Q151 Small-lamp DET SW When the base goes Hi, small-lamp is detected.
Q350-353 4V PRE+B When Q353’s base goes ON, 4V_PRE+B is output (up to 12V).
Q401-406 Pre-out Mute SW When a base gose Hi, pre-out is set to mute.
Q407,408 Pre-out Mute Driver When a base gose Lo, mute driver is turned on.
Q451 DC Offset Error DET Canceller Circuit turns off when one or more audio terminals of IC451 have voltage below 1.0V.
Q681 X15's LED SW When DSI port is Lo, X15’s LED is ON.
Q682,683 Panel+5V SW When Q682’s base gose Hi, Panel+5V is output.
Q766 HD Radio Mute SW When the base gose Hi, HD radio mute is ON.
Q768 HD Radio Reset SW When the base gose Hi, HD radio reset is ON.
●SWITCH UNIT (X16-6520-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Panel μ-COM LCD, encoder key and LED SW (ON/OFF) are controlled by IC1.
IC3 Remote Control IC Remote control signal receiver.
COMPONENTS DESCRIPTION

4
KDC-HD942U
Ref. No. Application / Function Operation / Condition / Compatibility
IC7 3.2V REG Power supply for 3.2V.
Q1 LED Driver Being controlled by IC1.
Q8 Rotary (R) LED Driver Being controlled by IC1.
Q9 Rotary (L) LED Driver Being controlled by IC1.
Q41 LCD Back Light LED Driver Being controlled by IC1.
●PROCESSOR UNIT (X17-2050-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 HD Radio Processor HD Radio data decorder.
IC2 SD RAM For buffering program and data.
IC151 Flash ROM For firmware installing.
Q101 Reset Inverter When the base goes Hi, reset of IC101 is ON.
●CD PLAYER UNIT (X32-6260-00)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Mechanism μ-COM Controls DSP and peripheral circuit.
USB host controller. (Compliant with Universal Serial Bus Specification Rev2.0)
IC2 Servo DSP with Built-in Audio DAC Built-in MP3·WMA·AAC decoder.
Built-in 1M-bit-SRAM.
IC3 4ch BTL Driver Driver for focusing & tracking coil, driver for sled & spindle motor, and operation for disc
loading & ejection.
IC4 iPod Authentication Connection authentication for iPod.
MFI341S2162: iPhone-compliant.
IC5 3.3V→5.0V Level Shift Converts communication signal from 3.3V to 5.0V.
IC6 5.0V→3.3V Level Shift Converts communication signal from 5.0V to 3.3V.
IC7 BU1.5V / BU3.3V Regulator Power supply for digital back-up.
Power supply for mechanism μ-COM.
IC8 E2PROM Memory for ROM correction.
Countermeasure for software malfunction.
IC9 A3.3V Regulator Power supply for digital, analog and audio line.
Q3 D1.5V Output The output voltage in which the power supply that diverges from the BU1.5V line is turned
on and off is used as D1.5V.
Q5 B.3.3V Output The output voltage in which the power supply that diverges from the BU3.3V line is turned
on and off is used as D3.3V.
Q6 Control signal Inverter Controls Q5.
Q7 APC (Auto Power Control) Laser diode driver.
Q9 Control signal Inverter Because the detection logic of LOE/LIM_SW is different in the mechanism μ-COM and the
system μ-COM, the logic to the mechanism μ-COM side is reversed.
D1 Laser Diode Protection Prevents reverse bias which is applied to laser.
Laser destruction prevention.
D2,3 Countermeasure against Static
Electricity
The potential difference between DGND and AGND is absorbed, and the malfunction by
static electricity is prevented.
COMPONENTS DESCRIPTION

5
KDC-HD942U
●System μ-COM: IC602 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 WIRED REMO I Remote control signal input Pulse width detection
2 NC - Not used Output L fixed
3 CD SYS DATA O Data from system μ-com to Bolero
4 CD CD DATA I Data from Bolero to system μ-com
5 CD CD CLK I Clock from Bolero
6 BYTE -
7 CVVSS -
8 XCIN - Resonator 32.768kHz
9 XCOUT - Resonator 32.768kHz
10 RESET -
11 XOUT - Resonator 12MHz
12 VSS -
13 XIN - Resonator 12MHz
14 VCC1 -
15 NMI - Not used
16 NC - Not used Output L fixed
17 FLIP DET I Panel-opened detection for flip-down panel H: Opened, L: Closed
18 BU DET I Back-up detection BU found: L, No BU or momentary power-
down or over-voltage: H
19 NC - Not used Output L fixed
20 PAN RST O Panel reset H: Normal, L: Reset
21 SRC KEY I Source key input H: OFF, L: ON
22 PANEL DET I Panel connector detached/attached detection L: Panel detached, H: Panel attached
23 EJECT KEY I Eject key input H: OFF, L: ON
24 NC (SYNC) - Not used Output L fixed
25 DSI (EJECT ILL) I/O DSI control L: Turned ON, Hi-Z: Turned OFF
26 PWIC BEEP O Beep output 2kHz / 1kHz
27 HR I2C SCL O I2C communication MAX 400kHz
28 HR I2C SDA O I2C communication MAX 400kHz
29 PAN SYS DATA O Data from system μ-com to panel UART MAX 500kHz
30 PAN PAN DATA I Data from panel to system μ-com UART MAX 500kHz
31 PAN SYS REQ O Communication request from system μ-com to panel
32 PAN PAN REQ I Communication request from panel to system μ-com
33,34 NC - Not used Output L fixed
35 HD RST O HD μ-com reset L: Normal, H: HD reset
36 CD DISC12 SW I 12cm disc detection L: 12cm disc
37 CD LOS SW I CD loading detection L: Eject completed
38 M STOP O Mechanism stop H: Normal, L: SOC stopped
39 ROM COR DET I ROM correction writing request H: ROM correction rewritable (I2C opened)
39 ROM COR EPM I Becomes EPM input when ROM collection is written Rewritable in Lo at the start-up
40 CD MUTE I Mechanism mute request L: Mute request, H: Normal
41 CD CD REQ I Communication request from mechanism to system
μ-com
42 M RST O Mechanism reset H: Normal, L: Reset
MICROCOMPUTER’S TERMINAL DESCRIPTION

6
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
43 CD LOE LIM SW I CD detection (chucking detection) H: Loading completed, L: No disc
44 PAN SC CON O Panel operation control
(Becomes CE when system μ-com is rewritten) H: Normal, L: Panel operation stopped
45 CD SYS REQ O Communication request from system μ-com to
mechanism
46 CD LOEJ I/O CD motor control qRefer to the truth value table
47 CD MOTOR O CD motor control qRefer to the truth value table
48 P.ON PANEL I/O Power supply for panel μ-com
(Necessary to certificate panel)
H: ON, Hi-Z: OFF (Panel detached, Panel
opened, POWER OFF)
49 P.ON ILL I/O Panel LED power supply control H: ON, Hi-Z: OFF (Panel detached, Panel
opened, POWER OFF)
50 NC - Not used Output L fixed
51 F.SEL I/O SW-REG frequency setting
Hi-Z: 530kHz-1100kHz in AM source,
H: All sources except AM
H: 1110kHz-1700kHz in AM source
52 P.ON I/O Power supply control H: ON, Hi-Z: OFF
53-55 NC - Not used Output L fixed
56 P.CON I/O P.CON control POWER ON: H, POWER OFF: Hi-Z,
STANDBY source: Hi-Z
57 ANT CON I/O ANT control TUNER source: H, Other sources: Hi-Z
58 ACC DET I ACC detection ACC found: L, No ACC: H
59 ILLUMI DET I Dimmer illumination detection L: ON, H: OFF
60 VCC2 -
61 NC (P.ON D5V) - Not used Output L fixed
62 VSS -
63 LINE MUTE I Line mute detection TEL mute: Below 1V, NAVI mute: Over 2.5V
64 DSP PDN O DSP reset H: Normal, L: Reset
65 P.ON 4VPRE O 4V-PRE power supply control H: ON, Hi-Z: OFF
66 MUTE 0 O E-VOL front mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
67 MUTE 1 O E-VOL rear mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
68 MUTE 2 O IC-2 SW mute control L: Mute ON, Time constant isolation set-
ting: 10ms, H: Normal
69 PWIC DC DET I DC offset detection
70 MUTE AFS I/O IC-2 mute AFS control L: Mute ON, Time constant isolation set-
ting: 0.5ms, Hi-Z: Normal
71 EVOL SDA I/O Data from system μ-com to E-VOL
71 E2P SDA I/O I2C data for mother E2PROM
71 DSP SDA I/O I2C data for DSP
72 EVOL SCL I/O Clock from system μ-com to E-VOL
72 E2P SCL I/O I2C clock for mother E2PROM
72 DSP SCL I/O I2C clock for DSP
73 LX REQ S I Communication request from slave unit
74 PWIC MUTE O Power IC mute STANDBY source or momentary power-
down: L, TEL mute: L
MICROCOMPUTER’S TERMINAL DESCRIPTION

7
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
75 PWIC STBY O Power IC standby POWER ON: H, POWER OFF: L
76 LX REQ M O Communication request to slave unit
77 LX MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF
78 LX CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF
79 LX RST O Forced reset to slave unit H: Reset, L: Normal
80 MUTE PRE O External preout mute 0-bit or momentary power-down: L,
L: Mute ON
81 MUTE PRE SW O External preout mute sub 0-bit or momentary power-down: L,
L: Mute ON
82-86 NC - Not used Output L fixed
87 HR P.CON O P.CON control for HD μ-com H: ON (same timing as LX-P.CON)
88 HR MUTE I Mute request from HD μ-com H: Mute cancelled, L: Mute
89 HR BU DET O Back-up detection for HD μ-com L: Back-up found (L fixed)
90-93 NC - Not used Output L fixed
94 AVSS -
95 NC - Not used Output L fixed
96 VREF -
97 AVCC -
98 LX DATA S I Data from slave unit
99 LX DATA M O Data to slave unit
100 LX CLK I/O LX-BUS clock
Truth value table
qCD motor control
CD MOTOR (Pin 47) CD LOEJ (Pin 46)
Standby L L
Eject H H
Load H L
Brake H Hi-z
MICROCOMPUTER’S TERMINAL DESCRIPTION
●HD μ-COM: IC851 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 IBOC BLEND I IBOC BLEND signal input L: Analog, H: Digital
2,3 NC - Not used Output L fixed
4 TOOL 1 O Debug Output L fixed
5 TOOL 0 I/O Debug Output L fixed
6 RESET I Reset L: Reset
7,8 NC - Not used General-purpose input setting
9 FLMD 0 I Debug Built-in pull-down

8
KDC-HD942U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
10 X2 I 20MHz External oscillation setting
11 X1 O 20MHz External oscillation setting
12 REGC - Built-in regulator stabilization
13 VSS - VSS
14 EVSS - EVSS
15 VDD - VDD 3.3V
16 EVDD - EVDD 3.3V
17 I2C SCL I System μ-com communication Clock input from system μ-com
18 I2C SDA I/O System μ-com communication Data input/output with system μ-com
19-32 NC - Not used Output L fixed
33 BU DET I Back-up detection input Not used
34 P.CON I Power control (Stop) input Rising edge: ON, L: OFF (Same timing as LX-BUS)
35 PROTOCOL SEL I Communication protocol selection L: KAB (Kenwood Advanced Bus), H: LX-BUS
36 PHY SEL I Physical layer selection L: Head unit (Over I2C)
H: Black box (Protocol compliant)
37 RESERVED 0 O Destination (Spare) Output L fixed
38 RESERVED 1 O Destination (Spare) Output L fixed
39 MUTE I/O Mute output (Head unit) Hi-Z: Mute cancelled, H: Mute
40,41 NC - Not used Output L fixed
42 TERMINAL RX I External terminal
43 TERMINAL TX O External terminal
44-46 NC - Not used Output L fixed
47 AVREF -
48 AVSS -
49 DIRANA INT END I Initial-end input from Dirana Hi when initial-end is output
50 DIRANA RESET O Reset output to Dirana L: Reset
51,52 NC - Not used Output L fixed
53 HD P.ON I/O HD (Cayman) P.ON
Switching power supply 3.3V ON/OFF H: 3.3V ON, Hi-Z: 3.3V OFF
54 CAYMAN RESET O Reset output to HD (Cayman) H: Reset
Hi is output after P.CON becomes Hi
55,56 NC - Not used Output L fixed
57 TUNER P.ON O Tuner (L-Dice) P.ON, AF5V ON/OFF H: RF5V ON, L: RF5V OFF
58 I2C SCL I/O Dirana, Cayman, E2PROM communication I2C clock
59 I2C SDA I/O Dirana, Cayman, E2PROM communication I2C data input/output
60 NC - Not used Output L fixed
61 3.3V F.SEL 0 I/O 3.3V REG frequency selection
H: 530kHz-1100kHz or 1610kHz-1700kHz in AM
Hi-Z: All sources except AM
Hi-Z: 1110kHz-1600kHz in AM
62 3.3V P.ON O Power supply 3.3V control
HD pack & module 3.3V/1.8V/1.2V control H: 3.3V ON, L: 3.3V OFF
63 CHECKER 1 O Chip select start-up check H: ON, L: OFF
64 CHECKER 0 O Chip select start-up check H: ON, L: OFF

9
KDC-HD942U
MICROCOMPUTER’S TERMINAL DESCRIPTION
●Panel μ-COM: IC1 on X16- (SWITCH UNIT)
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
1 REMO I Remote control signal input Pulse width detection
2-5 NC - Not used Output L fixed
6 BYTE - GND Connects to GND
7 CNVSS -
8 LED CONT LEFT BLUE O Blue key (left side) output Not used
9 LED CONT LEFT RED O Red key (left side) output Not used
10 RESET - Reset H: Normal, L: Reset
11 XOUT - Resonator 12MHz
12 VSS - GND Connects to GND
13 XIN - Resonator 12MHz
14 VCC1 - Power supply (5V) Connects to PAN5V
15 NMI - Not used Input fixed
16 LED CONT LEFT GREEN O Green key (left side) output Not used
17 LED CONT RIGHT BLUE O Blue key (right side) output Not used
18 LED CONT RIGHT RED O Red key (right side) output Not used
19 LED CONT RIGHT GREEN O Green key (right side) output Not used
20 LED CONT TRI RED O Triangle-red turning-on SW PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
21 LED CONT TRI GREEN O Triangle-green turning-on SW Not used
22 LED CONT LCD O LCD back-light PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 23kHz
23 NC - Not used Output L fixed
24 LED CONT RTY2 O LED rotary (MULTI-key side) PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
25 NC - Not used Output L fixed
26 LED CONT RTY1 O LED rotary (VOL-key side) PWM output H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
27,28 NC - Not used Output L fixed
29 PAN DATA O Data transmission from panel
30 SYS DATA I Data reception from system μ-com
31 SYS REQ I System μ-com communication request input H: Data communication
32 PAN REQ O Panel communication request output H: Data communication
33 LCD SDA O LCD data Outputs LCD SDA
34 NC - Not used Output L fixed
35 LCD SCK O LCD clock Outputs LCD SCK
36 LCD RST O LCD reset Normal: H, Reset: L
37 LCD CD O LCD CD L: Control data, H: Display data
38 LCD CS O LCD CS Outputs LCD CS
39 ROM COR DET I ROM correction writing mode H: ROM correction rewritable
(I2C opened)
40-43 NC - Not used Output L fixed
44 FLASH CE I Chip enable for flash ROM rewriting
45-50 NC - Not used Output L fixed

10
KDC-HD942U
Pin No. Pin Name I/O Application
Truth Value
Table Processing / Operation / Description
51 ROM COR SDA I/O Data transmission and reception for ROM cor-
rection Always output except in reading
52 ROM COR SCL I/O Clock for ROM correction Always output except in reading
53-55 NC - Not used Output L fixed
56 ROTALY2 CW I Rotary (MULTI-key) B input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
57 ROTALY2 CCW I Rotary (MULTI-key) A input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
58 ROTALY1 CW I Rotary (VOL-key) B input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
59 ROTALY1 CCW I Rotary (VOL-key) A input Pulse width detection.
1-pulse/2-click, 15-pulse/360°
60 VCC2 - Power supply (5V) Connects to PAN5V
61 NC - Not used Output L fixed
62 VSS - GND Connects to GND
63-70 NC - Not used Output L fixed
71 SC CON I System μ-com communication
Panel operation control
H: Panel operation,
L: Panel operation stopped
72 NC - Not used Output L fixed
73 KR2 I Key return input qRefer to the truth value table
74 KR1 I Key return input qRefer to the truth value table
75 NC - Not used Output L fixed
76-80 KS1-KS5 I/O Key scan qRefer to the truth value table
81 TYPE I Destination port H: Variable (RGB), L: Unicolor (blue)
82-93 NC - Not used Output L fixed
94 AVSS - GND Connects to GND
95 NC - Not used Output L fixed
96 VREF - A/D analog reference voltage Connects to PAN5V
97 AVCC - Power supply (5V) Connects to PAN5V
98-100 NC - Not used Output L fixed
Truth value table
qKey matrix
KR1 (Pin 74) KR2 (Pin 73)
KS1 (Pin 76) TI AM
KS2 (Pin 77) FNC <<
KS3 (Pin 78) PLAY
KS4 (Pin 79) SEARCH >>
KS5 (Pin 80) AUDIO FM
MICROCOMPUTER’S TERMINAL DESCRIPTION