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DV-C503
Ref. No. 3704
102001
SERVICE MANUAL
DVD Changer
MODEL DV-C503
RC-469DV
Black model
BUDD 120V AC, 60Hz
SAFETY-RELATED COMPONENT
WARNING!!
THE MARK FOUND ON SOME COMPONENT
PARTS INDICATES THE CRITICAL FOR RISK OF
FIRE AND ELECTRIC SHOCK.
WHEN REPLACING, BE SURE TO USE PARTS OF
IDENTICAL DESIGNATION.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
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DV-C503
SPECIFICATIONS
DVD Changer
Power supply AC 120 V, 60 Hz
Power consumption 20 W
Weight 15.0 lbs
External dimensions 17 1/ 8 " x 5 1/ 16 " x 16 15 /16 " (W/H/D)
Signal system NTSC
Frequency range (digital audio) 48 kHz sampling 4 Hz to 22 kHz
96 kHz sampling 4 Hz to 42 kHz
Signal-to-noise ratio (digital audio) More than 98 dB
Audio dynamic range (digital audio) More than 95 dB
Harmonic distortion (digital audio) Less than 0.005 %
Wow and flutter Below measurable level
Operating conditions Temperature: 5 C to 35 C (41 F to 95 F), Operation status: Horizontal
Outputs
Video output 1.0 V (p-p), 75 ohm , negative sync., pin jack 1
S-video output (Y) 1.0 V (p-p), 75 ohm, negative sync.
(C) 0.286 V (p-p), 75 ohm, Mini DIN 4-pin 1
Component video output (Y) 1.0 V (p-p), 75 ohm, negative sync., pin jack 1
(PB)/(PR) 0.7 V (p-p), 75 ohm , pin jack 2
Audio output (digital output Optical) Optical connecter 1
Audio output (digital output Coaxial) 0.5 V (p-p), 75 ohm, pin jack 1
Audio output (analog output) 2.0 V (rms), 320 ohm , pin jack (L, R) 2
Supplied Accessories
Audio/video connection cable 1
Remote controller (RC-469DV) 1
Batteries (size AAA/R3) 2
Specifications and features are subject to change without notice.
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DV-C503
SERVICE NOTE
PRECAUTIONS
1. Ground for the work-desk.
Place a conductive sheet such as a sheet of copper (with impedance lower than 10Mohm) on the work-desk and
place the set on the conductive sheet so that the chassis.
2. Grounding for the test equipments and tools.
Test equipments and toolings should be grounded in order that their ground level is the same the ground of the power source.
3. Grounding for the human body.
Be sure to put on a wrist-strap for grounding whose other end is grounded.
Be particularly careful when the workers wear synthetic fiber clothes, or air is dry.
4. Select a soldering iron that permits no leakage and have the tip of the iron well-grounded.
5. Do not check the laser diode terminals with the probe of a circuit tester or oscilloscope.
1. Replacing the fuses 2. Safety-check out
(Only U.S.A. model)
This symbol located near the fuse indicates that the After correcting the original service problem perform the
fuse used is show operating type, For continued protection against following safety check before releasing the set to the customer
fire hazard, replace with same type fuse , For fuse rating, refer to Connect the insulating-resistance tester between the plug of
the marking adjust to the symbol. power supply cord and terminal GND on the back panel.
Specifications: More than 10M ohm at 500V
Ce symbole indique que le fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.
REF.NO. PART NO. DESCRIPTION
F1 252159 2A-UL/T-237
LASER CAUTION
The lightning flash with arrowhead symbol, within an equilateral triangle, is
intended to alert the user to the presence of uninsulated "dangerous voltage"
within the product's enclosure that may be of sufficient magnitude to constitute
a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user
to the presence of important operating and maintenance (servicing) instruction
in the literature accompanying the appliance.
WARNING : TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN
OR MOISTURE. DANGEROUS HIGH VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE. DO NOT OPEN THE
CABINET. REFER SERVICING TO QUALIFIED PERSONNEL ONLY.
CAUTION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION : POUR EVITER LES CHOCS ELECTRIQUE, INTRODUIRE LA LAME LA PLUS LARGE DA LA FICHE DANS LA
BORNE CORRESPONDANTE DA LA PRISE ET POUSSER JUSQU' AU FOND.
Initialization of setup
1. Press the "DISC 4" and "CDPLAY" key to the same timing.
The "DISC 4 key is pushed previously.
Then, light off the FL tube.
2. Push the power switch.
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DV-C503
EXPLODE VIEW
S1
CHASSIS
S2
S1
S2
S2
H45
S3
S6 H35
S1 H37
S3 H34
S3 H38 S2
S6 S2
S3 S1
S2
H26
S2 S2
H46 H26 CC202
H52 H24
H41 U1 S2
S6 H26 CN
0 1
H47
S2
H27 S2
S2 S2 U3 S2
H27 S2
H44
H43 S2 CC201
S6
F1 H47
S2
S2 H21
H23
42
H8 H49
H7
U2
S2
H6 H53
S4 S2
H5 H47
S2
S5 S2
H4
H10 11 H12 H22
S4 S2 H42
FL
tub
e
S2
H47 H48
S2 H47
H47 S2
S4 S2
H2 H3 U2 H22
H20 H42
U2 S2
H15
S2 H14
H1
S5
H13
DV-C503
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DV-C503
PARTS LIST
CHASSIS
REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION
H1 55221110 Plate, DVD S1 838130068 3TTB+6B, Self tapping screw
H2 55184480 Drawer panel S2 838130088 3TTB+8B, Self tapping screw
H3 55221120 Clear plate S3 838130108 3TTB+10B(BC), Self tapping screw
H4 55186750 Badge Logo S4 831130088 3TTW+8B, Self tapping screw
H5 55186710 Facet S6 838440088 4TTB+8B(BC), Self tapping screw
H6 55244650 Button, STANDBY U1 55183100 Main circuit PC board
H7 55244620 Knob, POWER U2 55183110 Display PC board,
H8 55184600 Shaft, power Open/Close SW PC board,
H10 55244670 Button, PLAY Standby LED PC board
H12 55164930 FL holder U3 55183120 Output terminal PC board
H13 55184330 Front panel F1 252159 2A-UL/T-237, Fuse
H14 55244660 Button, OPEN/CLOSE
H15 55244680 Button, Keys (9-keys)
H20 55236110 Front chassis
H21 55201610 Sponge, front bracket NOTE: THE COMPONENTS IDENTIFIED BY MARK
H22 55125120 Foot (4) ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH
H23 55196510 Sponge, chassis PART NUMBER SPECIFIED.
H24 55174580 Bracket ground
H26 55186640 Bracket main PC board
H27 55178960 Spring
H34 55011170 Power cord, 1830mm
H35 55125180 Cord bushing
H37 55186610 Rear panel
H38 55174610 Bracket R small
H41 55186600 Top cover
H42 55141370 Rubber (4)
H42 55127310 Washer foot
H43 55184690 Power supply board unit
H44 55221140 Shield cover
H45 55186670 Bracket L, Frame
H46 55186680 Bracket R, Frame
H47 55174550 Cushion, 12 x 8 x 20
H48 55186620 Main chassis
H49 55190690 Rubber sheet
H52 55170390 Wire tie
H53 55190770 Sheet
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DV-C503
A B C D E
BLOCK DIAGRAM
+5VS
FL AC
FL AC
-17V IC901 FL tube
1
VFD DATA OUT
IR REMOCON
VFD DATA IN
POWER CTL
F-OE(DRAM OE)
VFD STD
VFD CLK
F-CE
+5V6S
AC120V, 60Hz
FLASH MEMORY
M29F400T-90N1
ADDR*
8MBIT
F-WE
IC401
AC CORD F-RESET
F-DE
DATA*
HY57V651610BTLC-8 125MHz
SDRAM-64MBIT
DATA*
2 RDNOTWR
IC301
D-RASO-
ADDR*
F-OE(DRAM OE) D-CAS1-
Power supply circuit D-CAS1
+12V ANALOG Vcc
+8V ANALOG Vcc
-8V ANALOG Vcc IC802-A-A
BA4560
+5V DIGITAL Vcc PCM1748E-CS
IC201 L AUDIO
L-CH MIXED
PCM1748E
+3.3V DIGITAL Vcc PCM1748E-CLK
PCM1748E-DATA L. P. F
DAC
+8V MOTOR Vcc MUTE
+12V MOTOR Vcc ST15519 PCMCLK
BCK
LRCLK
R AUDIO
R-CH MIXED
5V DISPLAY
MPEG L. P. F
AUDIO-MUTE
CVBS-OUT
TR
BUFFER CVBS-OUT CVBS-VIDEO
& B.N.F.
TR
Y-OUT
3 BUFFER
& B.N.F.
Y-OUT
S-VIDEO
TR
C-OUT
BUFFER C-OUT JK804
& B.N.F. RCA 3V
TR
R(Cr)-OUT
BUFFER R(Cr)-OUT 6 Cr
& B.N.F.
DVD Mechanism B(Cb)-OUT TR
BUFFER
& B.N.F.
B(Cb)-OUT
7 Cb
EXIT-PSTART/ERROR
EXIT-DATAVALID G(Y)-OUT TR
BUFFER G(Y)-OUT
Roulette Mechanism EXIT-DATA
EXIT-BCLK
& B.N.F.
+3V3-RESET 8 Y
IRQ2 SPDIF
F/E SCL
BUFFER COAXIAL 9
F/E SDATA
+3.3V DIGITAL Vcc 10
VIDEO-MUTE
+5V DIGITAL Vcc GND
+12V MOTOR Vcc
OPTICAL
PIXCLK-27MHz
SDA IC501
SLIDER-OPEN/CLOSE (POWER-POSITION P1)
74HC04
4 SLIDER-IN (DRAWER-CCW-CTRL)
SLIDER-OUT(DRAWER-CTRL)
EEPROM
M24C02
SCL
IC202
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DV-C503
A B C D E F G H
From Power supply unit
SCHEMATIC DIAGRAM
Display circuit PC board
1
Connection board GRID(00:11)
2
Standby LED PC board
3
4
Open/Close
PC board
5
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DV-C503
A B C D E
SCHEMATIC DIAGRAM
Output terminal PC board
1
From Main PC board
Audio output
2
Video output
From Main PC board
Component
3
4
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DV-C503
A B C D
Main circuit PC board
SCHEMATIC
DIAGRAM
1 To Down load JIG
2
3
4
From Pick up
From Display PC board
5
To Mecha. control PC board
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DV-C503
A B C D
SCHEMATIC DIAGRAM
1 To Down load JIG
2
3
4
5
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DV-C503
A B C D E
SCHEMATIC DIAGRAM
Mechanism circuit PC board
1
To Main control PC board
CN206
2
3
To Mecha. control
PC board
To P003
4
Roulette motor PC board
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DV-C503
A B C D E
SCHEMATIC DIAGRAM
Output terminal PC board
1
From Main PC board
Audio output
2
Video output
From Main PC board
Component
3
4
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DV-C503
A B C D E
PC BOARD CONNECTION DIAGRAM
AC 120V 60Hz
1
Main circuit PC board
B08
Power supply DVD Mecha.
2 circuit PC board F/E PC board
Output terminal PC board
Power switch
Connection
Mechanism control PC board
PC board
3 MOTOR
Standby OPEN/ CLOSE
switch switch PC board
PC board
CP904 CN904
Display circuit PC board
DV-C503
4
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DV-C503
PRINTED CIRCUIT BOARD PARTS LIST
DISPLAY CIRCUIT PC BOARD ASSY (PART NO. 55183110)
CIRCUIT NO. PART NO. DESCRIPTION
ICs
IC901 55183040NR CXP82324
IC902 55191090NR KIA7045
Transistor
Q901 5513318092 DTC114YKA
Remote sensor
RM901 55156010NR NJL63H38
FL tube
FL901 55183030NR HNA-12SM17
Diodes
D904 7043654016 1N4148
D905 55125510NR LED
D906 5517787088 RB501V-40
Coils
L901 1403936091 22uH, Chip
L902,L905 1032875091 0 ohm, Chip
L903,L904 2053866091 4.7 ohm, Chip
L909,L912, 5512667050 Choke
L913,L914
Resonator
X901 55126140NR 10MHz
Socket AS
CN901 55191010NR
CN902 55182990NR
CN903 55199600NR
CN904,CN905 55123320XX 2.0MM 5 MA ST
CN906 55199610NR
Socket
CP903 55090070XX
CP906 55123310XX
Capacitors
C901 2034206030 47uF,+/-20%, 16V, Elect
C903-C905, 2028804091 0.1uF, +80-0%,Chip
C908,C911
C906 2025205030 100uF,+/-20%, 6.3V, Elect
C907 2026862041 470uF,+/-20%, 6.3V, Elect
C909 2026884030 1uF,+/-20%, 50V, Elect
Switches
SW901,SW903, 55145270NR
SW905,SW907,
SW911,SW913,
SW915,SW917,
SW921,SW924,
SW927,SW930,
SW931
Spring
Finger 55178960XX Finger type
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DV-C503
A B C D E
PRINTED CIRCUIT BOARD VIEW
1
Display circuit PC board
Component side view
2
3
Soldering side view
4
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DV-C503
A B C D E
PRINTED CIRCUIT BOARD VIEW
Main circuit board Top pattern and top parts
1
2
3
DV-C503
4
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DV-C503
A B C D E
PRINTED CIRCUIT BOARD VIEW
Main circuit board Bottom pattern and bottom parts
1
2
3
DV-C503
4
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DV-C503
A B C D E
PRINTED CIRCUIT BOARD VIEW
Output terminal PC board
1
208C
308J
10NC
117D
10PC 508CI
208KJ 108KJ
308KJ 108J
328C
208J
608J
028C 128C
228C
508J
528C
428C
2
Component side view
3
Sodering side view
DV-C503
4
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DV-C503
PRINTED CIRCUIT BOARD VIEW
Open/Close switch PC board Standby switch PC board
309PC
ESOLC/NEPO
039WS
Soldering side view
Component side view
Soldering side view
Connection PC board
TESER.1 TESER.1
DxR.2 DxR.2
DxT.3 DxT.3
XUA/VT.4 XUA/VT.4
S6V5+.5 S6V5+.5
409NC
GEPM oT TNORF oT
Component side view
Soldering side view
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DV-C503
A B C D E
PRINTED CIRCUIT BOARD VIEW
Mechanism control PC board
1
300P 200C
81WJ
31WJ
71WJ
12WJ
6WJ
100CI
500C
400P
300R
300C
41WJ
01WJ
02WJ
100C
100D
400R
51WJ
100R
200R
100L
200D
7WJ
22WJ
200CI
8WJ
3WJ
400C
604P
2 Component side view
Roulette motor PC board
3
Component side view
DV-C503
4
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DV-C503
PRINTED CIRCUIT BOARD PARTS LIST
MAIN CIRCUIT PC BOARD ASSY (PART NO. 55183100)
CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION
ICs Capacitors
IC201 55130350 STI5519, Video processor C201P,C204, 20268940 100uF, +/-20%,10V, Elect.
IC202 20940740 M24C02WM, EEPROM C206,C210,
IC21P 20361320 KIA7806PI, Regulator C221,C232,
IC301 55156290 HY57V65162, DRAM C311,C406
IC301 55156420 K4S641632D, DRAM C327 15002130 10uF, +/-20%,16V, Elect.
IC302 55156030 PCM1748 KE, D/A converter C325,C331 20252680 1uF, +/-20%,10V, Elect.
IC303 55128990 BA4560F, Ope. Amp. C223B,C223C, 20252650 220uF, +/-20%,16V, Elect.
IC401 55177660 SST39VF800A-90-4C-EK, C223G,C223R,
Memory flash C223S,C223Y
IC501 55133310 M74HCU04M, Logic C330 20269110 330uF, +/-20%,6.3V, Elect.
Transistors C220B,C220C, 20252670 470uF, +/-20%,10V, Elect.
Q201-Q203 20970460 KTC3875Y C220G,C220R,
Q220B,Q220C, 55138690 KTN2907A C220S,C220Y
Q220G,Q220R, C233,C505 20268620 470uF, +/-20%,6.3V, Elect.
Q220S,Q220Y C228-C230, 20267830 470uF, +/-20%,16V, Elect.
Q221B,Q221C, 55138710 KTD1304 C301L,C301R,
Q221G,Q221R, C305L,C305R,
Q221S,Q221Y C306L,C306R,
Q301 55133180 DTC114YKA N C323
Q301L,Q301R 55039430 DTC323TK N Flexible flat cables
Q302L,Q302R 55133190 DTA114YKA P CC201 55182930 19X 1.25MM 180MM
Oscillator CC202 55182940 19X 1.25MM 100MM
X501 55128980 FILQZ 27M0 HZ Socket AS
Diodes CN201 55182960 5P 130MM UL1007 PVC
D301 55171070 UDZ 2.2 B 2.4V, Zener CN205 55182970 12P 150MM UL1007 PVC
D302 20441240 Wire buss, 7.5mm Connectors
D303 20496510 1SS355 35.0V CN206 55123450 2.0MM 12 MA R
Coils NAT LW2003P12
L201-L203 14041740 2U2H +10% CP201 55124680 1.25MM 19 FE R
L204-L206, 55126670 Beads, MT1 WH GF120-19S-LS
L210,L501 CP202 55125910 1.0MM 15 FE ST BK
L208,L209 14041740 2U2H +10%, Choke 00-6232-015-006-800
L211,L301 55126710 120OHM CHIP, Beads CP203 55125910 1.0MM 15 FE ST BK
L220B,L220C, 14041750 2U7H +10%, Choke 00-6232-015-006-800
L220G,L220R, CP205 55124600 1.25MM 19 FE ST WH
L220S,L220Y GF120-19S-TS 2794
L302 10134590 33R0 OHM, Choke
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DV-C503
PRINTED CIRCUIT BOARD PARTS LIST
MECHANISM CONTROL PC BOARD ASSY (PART NO. 55186040)
CIRCUIT NO. PART NO. DESCRIPTION
ICs
IC001,IC002 20656300NR LB1641
Diodes
D001,D002 2041428001 1N5232B, 5.6V, Zener
Photo diodes
PI001-PI003 20586840NR ITR9606/F2
PI004 20556130NR GP2S28 20M
Coil
L001 20265120NR LF 39U0H +10% 130M
Capacitors
C001,C003 8043459071 22pF,+/-5%, Ceramic (CH)
C002,C004 20246950AF 0.1uF,+/-10%, Ceramic
C005 20268030AM 1000uF,+/-20%, 25V, Elect
Socket
P003 20504010XX 2.0MM 6 MA ST
P027 20713500NR 06187F
P406 55183020NR
Resistors
R001,R002 5088295016 100 ohm, +/-5%, 1/6W
R003,R004 2054943001 2.2 ohm, +/-5%, 1/2W
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DV-C503
PRINTED CIRCUIT BOARD PARTS LIST
OUTPUT TERMINAL PC BOARD
CIRCUIT NO. PART NO. DESCRIPTION
IC
IC805 55164740NR Optical output terminal
Tansistors
Q801 2097046092 KTC3875Y
Q802 2097048092 KTA1504Y
Diode
D711 7043654016 1N4148
Coils
L801-L803 5512671050
Socket
CN01 55124600XX 1.25mm, 19P
CP01 55090070XX 2.0mm, 2P
Capacitors
C801 2026729091 0.1uF, +80-0%, Chip
C802 2026783030 47uF,+/-20%, 16V, Elect
C803 1105934091 0.01uF, +/-10%, Chip
C804 1105867091 100pF, +/-5%, Chip
C820-C822, 2026862030 470uF,+/-20%, 6.3V, Elect
C825
C823,C824 2025265030 220uF,+/-20%, 16V, Elect
Resistors
J893-J895 8044051091 o ohm
Terminals
JK801 55164750XX Coaxial output
JK802 55175260XX RCAV2P, Audio output
JK803 55191220XX RCA1P, Video output
JK804 55149420XX RCV3V, Component output
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DV-C503
PRINTED CIRCUIT BOARD PARTS LIST
MECHANISM CONTROL PC BOARD ASSY (PART NO. 55183130)
CIRCUIT NO. PART NO. DESCRIPTION
ICs
IC001,IC002 20656300NR LB1641
Diodes
D001,D002 2041428001 1N5232B, 5.6V, Zener
Photo diodes
PI001-PI003 20586840NR ITR9606/F2
PI004 20556130NR GP2S28 20M
Coil
L001 20265120NR LF 39U0H +10% 130M
Capacitors
C001,C003 8043459071 22pF,+/-5%, Ceramic (CH)
C002,C004 20246950AF 0.1uF,+/-10%, Ceramic
C005 20268030AM 1000uF,+/-20%, 25V, Elect
Socket
P003 20504010XX 2.0MM 6 MA ST
P027 20713500NR 06187F
P406 55183020NR
Resistors
R001,R002 5088295016 100 ohm, +/-5%, 1/6W
R003,R004 2054943001 2.2 ohm, +/-5%, 1/2W
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DVC-503
PANEL VIEW
FL DISPLAY
1 2 3 4 5 6 7 8 9 10 11 12
13 14 15
1 Inserted disc indicators 9 MEM. indicator
Indicate the type of current disc that is loaded. Illuminates during memory playback.
2 Play/Pause indicators 10 PBC indicator
Illuminate in play or pause mode. Illuminates when PBC is on for Video CD.
3 Parental Lock indicator 11 INTRO indicator
Illuminates in parental lock mode. Illuminates during intro-scan playback.
4 TITLE indicator 12 Elapsed time indicators
Illuminates to indicate the current title number. Indicate playing time.
5 RESUME indicator 13 Search indicators
Illuminates when the player is ready for resume playback. Illuminate during search and slow playback mode.
6 CHPTER/TRACK indicators 14 Disc number indicator/CD indicator
Indicate display mode of the current chapter of DVD disc or Disc number indicators indicate the presence of a disc. CD
track number of Video CD or CD. indicator illuminates when the DVD Changer is in CD Play
mode.
7 RANDOM indicator
Illuminates during random playback. 15 Multifunction indicator
Indicates operating status, messages, etc.
8 REPEAT indicators
Illuminate during repeat playback.
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DV-C503
MICROPROCESSOR TERMINAL DESCRIPTION
IC901 CXP82532 PIN LIST
PIN
PIN NAME MAIN FUNCTION IN/OUT
NUMBER
1 PE3/INT3 INPUT FOR EXTERNAL INTERRUPT REQUEST. I
2 PE4/RMC INPUT FOR REMOTE CONTROL RECEIVING CIRCUIT. I
3 PE5 - I
4 PE6 - O
5 PE7/TO OUTPUT PIN FOR 16-BIT TIME/COUNTER RECTANGULAR WAVEFORM. O
6 PBO/CINT EXTERNAL CAPTURE INPUT FOR 16-BIT TIME/COUNTER. I/O
7 PBI/'CSO CHIP SELLECT INPUT FOR SERIAL INTERFACE(CH0). I/O
8 PB2/'SCKO SERIAL CLOCK (CH0) INPUT/OUTPUT. I/O
9 PB3/SIO SERIAL DATA (CH0) INPUT. I/O
10 PB4/SOO SERIAL DATA (CH0) OUTPUT. I/O
11 PB5/'SCK1 SERIAL CLOCK (CH1) INPUT/OUTPUT. I/O
12 PB6/SI1 SERIAL DATA (CH1) INPUT. I/O
13 PB7/SO1 SERIAL DATA (CH1) OUTPUT. O
14 PCO/KRO KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERFORMS KEY SCANNING. I/O
15 PC1/KR1 KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERFORMS KEY SCANNING. I/O
16 PC2/KR2 KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERFORMS KEY SCANNING. I/O
17 PC3/KR3 KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERFORMS KEY SCANNING. I/O
18 PC4/KR4 KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERFORMS KEY SCANNING. I/O
19 PC5/KR5 KEY RETURN INPUT FOR FDP SEGMENT SIGNAL WITCH PERF