Kenwood VR 3080 - Dolby Digital Receiver User manual

AUDIO VIDEO SURROUND RECEIVER
KRF-V7772D
VR-3080
SERVICE MANUAL © 1999-3/B51-5511-00 (K/K) 1841
POWER
ON/STANDBY
CLIP INDICATOR DOLBY DIGITAL DTS
SPEAKERS
A
BMUTE
VOLUME
DOWN UP
INPUT SELECTOR
DISPLAY MODE
PHONES S VIDEO V AV AUX L-AUDIO-R CD2/TAPE2
MONITOR
PRE OUT
FRONT
SURROUND CENTER
SUBWOOFER
AM
GND
FM
75Ω
ANTENNA
AUDIO
PHONO CD1
MD/TAPE1
REC
OUT PLAY
IN
VIDEO1
REC
OUT PLAY
IN
VIDEO2
PLAY
IN
VIDEO3
PLAY
IN
VIDEO4
PLAY
IN
CD2/TAPE2
MONITOR
REC
OUT PLAY
IN
FRONT SPEAKERS
(6-16Ω)
SURROUND SPEAKERS
(6-16Ω)
CENTER
SPEAKER
(6-16Ω)
SWITCHED
TOTAL 100W MAX.
S VIDEO
VIDEO
MONITOR
OUT
VIDEO1
REC
OUT PLAY IN
VIDEO2
PLAY
IN
VIDEO3
PLAY
IN
VIDEO4
PLAY
IN
DIGITAL IN
SL16
TEXT SYSTEM
CONTROL
VIDEO2
OPTICAL OPTICAL COAXIALCOAXIAL
VIDEO3 VIDEO4 CD1
IRRECEIVER
IN
DC12V 15mA
IRREPEATER
OUT
IROUT
LCD
REMOTE
SL16 XS8
Panel *
(A60-)
Panel escutcheon
(B01-0533-21)
Knob
(K29-6855-03) Indicator (B12-0333-04) Knob
(K29-6855-03)
Front glass
(B10-2418-03)
Indicator
(B12-0326-04) Front glass (B10-2451-03)
Cylindrical receptacle
(E56-0012-05) Foot (J02-1405-03)
Phone jack
(E11-0271-05)
Knob
(K29-6858-12)
Indicator
(B12-0331-04)
Knob
(K29-6858-12) Knob (K29-6852-04)
AC power cord*
(E30-)
Slide switch
(S31-2132-05)
Phono jack
(E63-1028-05)
Cylindrical receptacle
(E56-0011-05) Phono jack
(E63-0162-05)
Phono jack
(E63-0141-15)x2
Screw terminal board
(E70-0096-05)
*Refer to parts list on page37~.
Power cord bushing
(J42-0083-05)
Phono jack
(E63-1084-05)
Screw terminal board
(E70-0095-05)
Miniature phone jack
(E11-0360-05)
Miniature Phone jack
(E11-0291-05)
Optical receiving module
(W02-1181-05)
Lock terminal board
(E70-0052-05)
AC outlet *
(E03-)
Miniature Phone jack
(E11-0389-05)
Phono jack
(E63-0139-15)
Miniature Phone jack
(E11-0293-05)
Phono jack
(E63-1030-05)
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 2

PowerPad
(A70-1191-05) : RC-R0907
Battery cover(A09-1115-08)
Remote
ENTER
VOLUME
CONFIRM
MUTE
ON/STANDBY
Batteries AM Loop Antenna (T90-0833-05)
AC
(E03-0115-05)
plug adapter
FM
(T90-0841-05)
Antenna
Use to adapt the plug onthe
power cord to the shape of the
wall outlet.
(Present only for regions where
use is necessary.)
AM Antenna Base
KRF-V7772D/VR-3080
2
CONTENTS / ACCESSORIES
CONTENTS/ACCESSORIES/CAUTIONS...................2
CONTROLS.................................................................3
DISASSEMBLY FOR REPAIR.....................................4
BLOCK DIAGRAM.......................................................5
CIRCUIT DESCRIPTION.............................................6
ADJUSTMENT...........................................................12
WIRING DIAGRAM....................................................13
PC BOARD ................................................................14
SCHEMATIC DIAGRAM............................................19
EXPLODED VIEW .....................................................36
PARTS LIST...............................................................37
SPECIFICATIONS.....................................................49
Contents
Accessories
RESET
Resetting ReceiverPowerPad
If you want to reconfigure PowerPad, you can reset
it. You do not need to do this unless you experience
a problem.
1. Open the cover and remove the batteries,
2. Use a pen or other thin-tipped object to press
the blue button in the center of the battery case:
OPEN
3. Reinstall the batteries and follow the instruc-
tions in this chapter to set up PowerPad again.
If none of the above solutions work, reset the micro-
processor:
(For USA and Canada)
1. Turn the receiver off.
2. Unplug the receiver.
3. Plug it back in while pressing and holding the
Power button (you may need someone else to
help you do this)
4. Continue to hold the Power button for more than
1 second.
(For Other Countries)
1. Turn the receiver off. (The Power button is OFF
position.)
2. Press ON/STANDBY button while pressing and
holding the Power button.
3. Continue to hold the Power button for more than
1 second.
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 3

KRF-V7772D/VR-3080
3
CONTROLS
POWER
ON/STANDBY
CLIP INDICATOR DOLBY DIGITAL DTS
SPEAKERS
A
BMUTE
VOLUME
DOWN UP
INPUT SELECTOR
DISPLAY MODE
PHONES S VIDEO V AV AUX L-AUDIO-R CD2/TAPE2
MONITOR
POWER
ON/STANDBY
ON OFF
9. Volume control knob
10. Display Mode button
11. Input selector button
12. AV AUX S VIDEO jack
13. AV AUX composite video jack
14. AV AUX audio jacks
15. CD2/Tape 2 Monitor indicator light
1. Power On/Standby button
2. Power indicator light
3. Display panel
4. Speaker selector buttons
5. Headphone jack
6. Mute button
7. IR indicator
8. IR transmitters
Except for USA
and Canada
ENTER
VOLUME
CONFIRM
MUTE
ON/STANDBY
1. LCD display screen
2. Joystick
3. Enter button
4. Volume up button
5. Volume down button
6. Confirm button
7. Mute button
8. On/Standby button
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 6

6
6
3
4
4
9
9
3
3
2
11
12
1
43
5x2
9x5
8x2
3x2
7
13
13 13
14
14
15
10
KRF-V7772D/VR-3080
4
DISASSEMBLY FOR REPAIR
1
4
5
6
x2
3x4
2
X09-
x3
HOOK
HOOK
14
6
6
6
6
x2
3
2x2
2x7
X08-
X08-
1
1
4
4
46
65
B side
[Remove the escutcheon (operation
panel)]
1. Remove the knob(1), the nut (2), the 11
screws(3, 4, 5) and 2 hooks (6), then
remove the front panel ass'y.
2. Remove the lead wire(7), the 2 screws(8:
except K,P type) and 7 screws(9) then
remove the PCB.
3. Remove the under front glass(0, -), then
remove the front panel(=) from the sub
panel.
4. Remove the 2 under escutcheon sides(~) by
·screw driver and the 2 hooks(!) then
remove the escutcheon(@).
[Check the audio PCB(X09)]
1. Remove the 9 screws (1,2,3).
2. Remove the 4 hooks(4,5) and remove the
audio PCB(X09),then stand the set with left
side downward.
3. Connect between the chassis of the set and
the rear panel with an alligator clip lead wire
(6).
[Check the B side of the DSP PCB
(X08)]
1. Remove the 11 screws(1,2).
2. Remove the X08(C/10)(J/10) (3), then
remove the X08(A/10) (4).
3. Solder the pin 1(-17V), the pin 4 (+17V) and
the pin 6(GND) between CN1 on the
X08(A/10) and CN2 on the X08(I/10) with 3
lead wires (5).
4. Connect between the each GND of J1, J62,
J61, J2 on the X08(A/10)and the rear panel
with 4 alligator clip lead wires (6).
Fig. 2
Fig. 1
Fig. 3
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 7

VIDEO 1
AV AUX
(FRONT)
VIDEO 4
VIDEO 3
VIDEO 2
VIDEO 1
COMP
VIDEO
PLAY
COMP
REC
VIDEO
Q611,612
BA7626F
IC61
Q621,622
OUT Q623
(OSD)
1Vp-p/75
(VISUAL)
VIDEO 1
VIDEO 2
VIDEO 3
VIDEO 4
(FRONT)
AV AUX
REC
PLAY
(S1-VIDEO)
1Vp-p/75
MONITOR OUT
Q643
Q653,
Q655
Q642
Q641
VIDEO 1
Q651,652
BA7626F
IC65,66
CD1
VIDEO1
VIDEO2
VIDEO3
VIDEO4
MD/TAPE1
TAPE2
VIDEO1
VIDEO3
VIDEO2
VIDEO4
AVR
IC8
+5.7V
GND
D17-20
FINAL TR.
FINAL TR.
GND
PRE DRIVE
GND
PRE DRIVE
D2
D1
Q100
RELAY
DRIVER
-17V
GND
+17V D3-6
Q2
AVR
Q1
+5.0V
GND
Q16
AVR D13-16
Q7 AVR
-35V
FIL
FIL
STROKE SW
Q8
RELAY
DRIVER
AC OUTLET
D9
K6
T1
AVR
IC5
CD1
L3,R3
L2,R2
L1,R1
L8,R8
L7,R7
L6,R6
L5,R5
L5,R5
MONITOR
L6,R6
MD/TAPE1 L4,R4
L3,R3
IC2
BUFFER
REC OUT
L1,R1 L8,R8
L7,R7
IN L2,R2
LINE
BUFFER
IC3
TUNER
2.5mV/
PHONO
IC6
IC5
IC4
IC1
EQ
(ANALOG)
INPUT ATT IC1
BUFFER
DAC
DIR
IC3 21kHz LPF
21kHz LPF
21kHz LPF
21kHz LPF
IC11
IC21
IC31(1/2)
IC31(2/2)
SUB
CENTER
LS,RS,
FL,FR
CONFIG-2
IC12,13
FILLTER
TONE OFF
L7,R7
L6,R6
L5,R5
L2,R2
TONE
IC41
IC42
L1,R1
L8,R8
L3,R3
VOLUME
VOLUME
VOLUME
VOLUME
IC16
IC26
IC36(1/2)
IC36(2/2) Q352
Q251,252
-20dB
Q351
Q151,152
ATT
-20dB
ATT
-20dB
ATT
-20dB
ATT
IC37
(2/2)
(1/2)
IC27
IC17
AMP
Q15
Q13,14
Q11,12
MUTE
MUTE
MUTE
A-MUTE
MUTE
Q253-256
Q353,355
MUTE
Q354,356
MUTE
MUTE
K5
K4
K2
POWER
AMPLIFIER
POWER
POWER
K3
RELAYA
RELAY CS
RELAY B
A-MUTE
S-MUTE
SW-MUTE
FRONT
SW
L,R
FRONT B
C
LS,RS
PHONES
L,R
FRONTA
SPEAKERS
PRE OUT
1.0V/1K
u-COM
IC71
CONTROL
REMOTE
A91
PROTECTION
S1 DETECTOR
V MUTE
SP.RELAY
SW MUTE
S MUTE
A MUTE
200mV/47K
200mV/2.2K
IN
OUT
OTHER
IC15
AMPLIFIER
AMPLIFIER
DIGITAL
PHONES1.3Vrms/32 S1
CD2/TAPE2
PLAY
IN
AV AUX IN
(FRONT)
REC
OUT
COAXIAL
IN
OPTICAL
IN
(2/2)
IC32
L,R
+5.7V IC62
AVR
4.7K
PHONO
Q153-156
1.1Vrms/32
A2
A1
L4,R4
MONITOR
Q3,4Q1,2
654
IC37
C
LS,RS
A/C
CONVERTER
CS4226
DSP
SRAM
IC51
IC52
X51
IC56,57
-6dB
ATT
IC32
(1/2)
L4,R4
TUNER 8
AUDIO SEL. 3
DPS 10
DIR DAC,ADC 9
TONE.VOL. 3
20dB ATT
3
6 (J TYPE)
OUT
IR REPEATER
J85
IN
IR RECIEVER
J84
OUT
IR RECIEVER
J83
IR LED
REMOTE OUT
D571-574
SYSTEM
J81
SYSTEM
CONTROL
J82
TEXT
SL16
FL
ED1
LEDx7
FL
MI-COM
IC91
38kHz
FILTER
856,857
Q851,852,
455kHz
FILTER
Q853-855
CONTROL
IC72
REMOTE
MI-COM
X8
RX
BUSY
TX
DATA,
D30
D10
AVR
IC54
+3.3V
AVR
J
K,Y,M,X
20.0V/4
24.5V/6K,Y,M,X
J
5ch SP. OUTPUT
DETECTOR
S1
IC67
J1
J2
-20dB ATT
K1
V-MUTE
Y
C
C
Y
Y
C
C
Y
C
Y
V-MUTE
Y
C
C
Y
+
+
+
SE-RLY
+
+
+
POWER-RLY
to
u-COM
to
POWER
SELECTOR
to
SRAM
CODEC
VOLUME
-3dB ATT -6dB ATT
-144
R141
ST
RST
CK
DI
DO
51
to
u-COM
FL
TONE
TUNER
PRE AMP
to DSP
to
to
VIDEO
SELECTOR
u-COM
EACH
INPUT
C-TERMMNAL
VR-3080
(X09) (X08)
(X09)
(X09)
KRF-V7772D
(X08)
(X05)
(X08)
(X08)
(J TYPE)
(X08)
(SIGNAL STAGE) (u-COM STAGE)
KRF-V7772D/VR-3080
5
BLOCK DIAGRAM
KRF-V7772D(K)COVER1,1( 99.10.2910:11 AM y[W 10

KRF-V7772D/VR-3080
6
CIRCUIT DESCRIPTION
(0 : Pull down, 1 : Pull up)
TYPE BAND Reception
frequency Channel IF
PLL standard
Tuner sw
space frequency TSW3 TSW2 TSW1 TSW0
K1 FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 0000
1700 AM 530kHz~1700kHz 10kHz +450kHz 10kHz
K2 FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 0011
1610 AM 530kHz~1610kHz 10kHz +450kHz 10kHz
K4 FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 1010
1700 RBDS AM 530kHz~1700kHz 10kHz +450kHz 10kHz
E1 FM 87.5MHz~108.0MHz 50kHz +10.7MHz 25kHz 0001
AM 531kHz~1602kHz 9kHz +450kHz 9kHz
E3 FM 87.5MHz~108.0MHz 50kHz +10.7MHz 25kHz
RDS AM 531kHz~1602kHz 9kHz +450kHz 9kHz 0101
FML 65.0MHz~74.0MHz 10kHz +10.7MHz 5kHz
Q1 FMH 87.5MHz~108.0MHz 50kHz +10.7MHz 5kHz 1011
RDS AM 531kHz~1602kHz 9kHz +450kHz 9kHz
MK2/E1 is switched with only the setting of DSW1 (X11 : S601). 00X1
(DSW1 = 0 : K2 type, 1 : E1 type)
10 11 12 13
1. The back up item and initialization
condition
1-1 Back up
• POWER ON/OFF : OFF
• VOLUME LEVEL : -66dB
• AUDIO INPUT • SELECTOR : TUNER
• VIDEO INPUT • SELECTOR : VIDEO1
• SPEAKER A : ON
• SPEAKER B : OFF
• CD2/TAPE2 MONITOR : TAPE2 OFF
• TONE : OFF
• LOUDNESS : OFF
• DISPLAY MODE : DEVICE+DGTL/ANLG
• DIMMER : DIMMER 1 (LIGHTEST)
• SURROUND MODE : STEREO
• ROOM SIZE : Med
• WALL TYPE : Med
• EFFECT LEVEL : 3
• MIDNIGHT MODE : OFF
• DISTANCE : FL/FR : 10ft
: C : 10ft
: RS/LS : 5ft
: SW : 10ft
• FRONT SP. : LARGE
• CENTER SP. : NORMAL
• SURROUND SP. : NORMAL/WIRED
• SUB WOOFER : ON
• SW Re-Mix : OFF
• INPUT LEVEL : 0dB
• CH. LEVEL : 0dB
• TONE BASS : 0dB
• TONE TREBLE : 0dB
• TUNING MODE : AUTO
• PRESET MEMORY : TEST MEMORY FRE-
QUENCY (Same value with KR-V999D/1090VR)
• LAST BAND : FM
• FM LAST FREQUENCY : 87.5MHz
• AM LAST FREQUENCY : 531kHz (CH. SP 9kHz)
: 530kHz (CH. SP 10kHz)
• LAST P. ch : [- -ch]
1-2 The initial setting
While pressing POWER key, plug the AC power cord into
an AC outlet (K,P type) or turn on the AC POWER
switch.
3. TEST MODE
[setting method]
While pressing INPUT SELECTOR key, plug the AC
power cord into an AC outlet (K, P type) or turn on the
AC POWER switch. When a set is set up in test mode
condition a set becomes the following condition.
Automatic POWER ON. All indicator tube (FL) and
CLIP INDICATOR LED are lighted. The other LED are
flashed.
A backup at the thing except ON/OFF of POWER is
initialized.
[cancel method]
The power supply is turned off.
2. Condition by the destination or model
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 11

KRF-V7772D/VR-3080
7
CIRCUIT DESCRIPTION
(X08)IC16 (X08)IC15
(X08)IC26 (X09)IC5
(X08)IC36 (X09)IC4
(X08)IC42
(X08)S91-96 (X08)S97 (X08)IC71 (X08)IC3
(X08)IC91 (X08)IC51
(X09)ED1
(X09)K2-5
(X05)
(X08)J81
(X08)IC72 (X08) (X08)A91 (X08)J84
MAIN UCOM
µPD784214GF-527
TACT KEY ROTARY-
ENCODER
FLDRIVER
uPD780204
DESTYINA
FL TI
ON SW
LCD REMOTE
TRANSMIT IC
VOLUME IC
TC9412
VOLUME IC
TC9412
VOLUME IC
TC9412
SELECTOR IC
TC9162
SELECTOR IC
NJU7312AL
SELECTOR IC
NJU7313AL TONE CONTROL IC
TC9184
CODEC
CS4226
DSP
YSS912
SP.RELAY
MUTETUNERUNIT
IR RECEIVER
DESTINATION IRREMOTE IR RECEIVER
SYSTEM
CONTROL
uPD17215
4. Main microprocessor: uPD784214GF-527(X08: IC71)
4-1 Microprocessor periphery block diagram
Push key INPUT SELECTOR SP A SP B MUTE DISPLAY MODE
TUNER STEREO P. CALL
UP P. CALL DOWN
ATT
OFF ON FM
AUTO/STEREO MANUAL/MONO
(DOLBY DIGITAL LED : OFF ON)
(Press the key for 2 secs)
CD1 STEREO TONE (TUNED)
+10 (light on) OFF (light off)
ANALOG DIGITAL
MD/TAPE1 STEREO
IR RECEIVER A(ON) OFF
VIDEO1 PRO LOGIC
VIDEO2 3 STEREO
DISPLAY VIDEO3 STEREO
VIDEO4 DSP
ARENA JAZZ CLUB
THEATER STADIUM
CATHEDRAL
AV AUX STEREO TAPE2
OFF ON
PHONO STEREO INPUT LEVEL
0dB -3dB -6dB
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 14

KRF-V7772D/VR-3080
8
CIRCUIT DESCRIPTION
Pin No. Name I/O Connect Description
1-8 REM_D0-D7 O P.D. LCD REMOTE DATA OUT-7
9 VDD - - +5V
10-13 TSW3-0 I - TUNER DESTINATION SWITCH3-0
14 ENC_A I - VOLUME ENCODER INPUT A
15 ENC_B I - VOLUME ENCODER INPUT B
16 - I P.D. Not used
17 T_MUTE O P.U. TUNER MUTE
18 PLL_CLK O P.D. PLL(LC72131) CLOCK
19 PLL_DATA O P.D. PLL(LC72131) DATA
20 PLL_DO I P.D. PLL(LC72131) DO
21 PLL_CE O P.D. PLL(LC72131) CE
22 TEST/VPP - - GND
23 PLL_SD I P.U. PLL(LC72131) SD
24 PLL_STEREO I P.U. PLL(LC72131) STEREO
25-28 WIDE_V1-4 I P.U. VIDEO1-4 S1 WIDE DETECTOR
29 WIDE_AUX I P.U. AV AUX S1 WIDE DETECTOR
30 WIDE_OUT O P.D. MONITOR OUT S1 WIDE INPUT
31 VIDEO_MUTE O P.D. VIDEO MUTE (mute on:H)
32 TONE_ST O P.D. TONE(TC9184) STROBE
33 VOL_ST O P.D. VOLUME(TC9412) STROBE
34 VOL_DATA O P.D. VOLUME(TC9412), TONE(TC9184) DATA
35 VOL_CLK O P.D. VOLUME(TC9412),TONE(TC9184)CLOCK
36 CE I P.D. CHIP ENABLE
37 VDD - - +5V
38 X2 - - 12.5MHz
39 X1 I - 12.5MHz
40 VSS - - GND
41,42 XT2,1 - - Not used
43 RESET I - RESET
44 REM0 I P.D. REMOTE CONTROLLER SIGNAL INPUT 0 (FRONT PANEL)
45 REM1 I P.D. REMOTE CONTROLLER SIGNAL INPUT 1 (IR RECEIVER)
46 CODEC_CS I P.D. CODEC(CS4226) CHIP SELECT
47 CODEC_ERR I P.D. CODEC(CS4226) ERROR DETECT
48 CODEC_AC3 I P.D. CODEC(CS4226) AC-3(DOLBY DIGITAL, DTS, MPEG DETECT
49 DSP_DTS I P.D. DSP(YSS912) DTS DETECT
50 DSP_AC3 I P.D. DSP(YSS912) AC-3 DETECT
51 AVDD - - +5V
52 AVREF0 - - GND
53 DATA_DET I P.D. DIR DATA DETECT
54 CODEC_FREQ1 I P.D. CODEC(CS4226) CHANNEL STATUS FREQ. BIT 1
55 CODEC_FREQ0 I P.D. CODEC(CS4226) CHANNEL STATUS FREQ. BIT 0
56,57 Not used I - GND
58 CODEC_AUDIO I P.D. CODEC(CS4226) non AUDIO DETECT
59 DSP_NPCM I P.D. DSP(YSS912) non PCM DETECT
60 DSP_SENC I P.D. DSP(YSS912) SURROUND ENCODE DETECT
61 AVSS - - GND
62 DSP_CS_A O P.D. DSP(YSS912) CHIP SELECT
63 DSP_CS_B O P.D. DSP(YSS912) SUB DSP CHIP SELECT
64 AVREF1 - - +5V
65 DSP_SI I P.D. DSP(YSS912), CODEC(CS4226)DATA IN
4-2 Pin description
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 15

KRF-V7772D/VR-3080
9
CIRCUIT DESCRIPTION
Pin No. Name I/O Connect Description
66 DSP_SO O P.D. DSP(YSS912), CODEC(CS4226)DATA OUT
67 DSP_SCK O P.D. DSP(YSS912), CODEC(CS4226)CLOCK
68 TEXT_RX I P.D. CD TEXT UART COMMUNICATION DATA IN
69 TEXT_TX O P.D. CD TEXT UART COMMUNICATION DATA OUT
70 DSP_IC O P.D. DSP(YSS912) INITIAL CLEAR
71 FL_RST O P.D. FL DRIVER(uPD780204) RESET
72 FL_STB O P.D. FL DRIVER(uPD780204) STROBE
73 FL_DI I P.D. FL DRIVER(uPD780204) DATA IN
74 FL_DO O P.D. FL DRIVER(uPD780204) DATA OUT
75 FL_CLK O P.D. FL DRIVER(uPD780204) CLOCK
76 8/16 I/O - SERIAL XS8/SL16 CHANGEOVER(SL16:L)
77 S_DATA I/O P.D. SERIAL DATA
78 S_BUSY I P.D. SERIAL BUSY
79 SW_MUTE O P.D. SUBWOOFER MUTE
80 ATT-20dB O P.D. 20dB AMP CHANGEOVER (AMP on:H)
81 SUR_MUTE O P.D. SURROUND ch MUTE
82 MAIN_MUTE O P.D. MAIN MUTE
83,84 SP_A,B O P.D. SPEAKER A,B RELAY
85 SP_CS O P.D. CENTER,SURROUND SPEAKER RELAY
86 POWER O P.D. POWER RELAY
87 SECOND O P.D. POWER RELAY 2
88 I_PROT I P.D. PROTECTION CURRENT DETECT
89 V_PROT I P.D. PROTECTION VOLTAGE DETECT
90 IR_RCV I - IR RECEIVER DISTINCTION(IR RECEIVER EXIST:H)
91 SEL_CLK O P.D. SELECTOR(NJU7312,NJU7313,TC9162) CLOCK
92 SEL_DATA O P.D. SELECTOR(NJU7312,NJU7313,TC9162) DATA
93 SEL_ST O P.D. SELECTOR(NJU7312,NJU7313,TC9162) STROBE
94 IN_ATT3 O P.D. INPUT ATTENUATOR -3dB
95 IN_ATT6 O P.D. INPUT ATTENUATOR -6dB
96 TAPE2_LED O P.D. TAPE2 LED
97 REM_RWR I P.D. LCD REMOTE RWR
98 REM_ENB I P.D. LCD REMOTE ENABLE
99 REM_REQ O P.D. LCD REMOTE REQUEST
100 VSS - - GND
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 18

TC9162AF(X08:IC15) (1:H , 0:L)
PIN No.(L ch) 2 3 5689
PIN No.(R ch) 27 26 24 23 21 20
SW No. (L.R ch) L1,R1 L2,R2 L3,R3 L4,R4 L5,R5 L6,R6
TONE on 1 0
TONE o ff 0 1
SPEAKERS B on 1 0
SPEAKERS B o ff 0 1
ANALOG THROUGH 1 0
D/ A OUT (LOW BOOS T on *1) 0 1
D/ A OUT (LOW BOOS T o ff) 0 0
11
18
L7,R7
0
0
1
*1: SW off
NJU7313AL(X09:IC4), NJU7312AL (X09:IC5) (1:H , 0:L)
NJU7313AL NJU7312AL *3
PIN No.(Lch) 2 3 4 5 7 8 10 11 2 3 4 6 7 8
PIN No.(Rch) 27 26 25 24 22 21 19 18 27 26 25 23 22 21
SW No. (Lch) L1 L2 L3 L4 L5 L6 L8 L9 L1 L2 L3 L4 L5 L6
SW No.(Rch) R1 R2 R3 R4 R5 R6 R7 R8 R1 R2 R3 R4 R5 R6
*1 TUNER 1 0 0 0 0 0 1 1 1 0 0 0
CD1 000010 111000
MD/TAPE1 000100 011000
VIDEO1 0 0 0 0 0 0 1 1 0 0 1 0
VIDEO2 0 0 0 0 0 0 1 1 1 0 0 1
VIDEO3 0 0 0 0 0 0 1 1 1 0 0 0
VIDEO4 0 0 0 0 0 0 1 1 1 0 0 0
AVAUX 000000 111100
PHONO 0 1 0 0 0 0 1 1 1 0 0 0
CD2 /TAPE2 o ff 0 1
CD2 /TAPE2 on 1 0
*2 00100000111000
10 11
19 18
L7 L8
R7 R8
00
00
00
00
00
10
01
00
00
00
KRF-V7772D/VR-3080
10
CIRCUIT DESCRIPTION
4-3 Circuit control
(a) Selector IC
(b) Selector IC
(VIDEO SELECTOR, DIGITAL/ANALOG INPUT DISTINCTION) (1:H , 0:L)
PIN No. 32 33 34 35 36 37 38
P0 P1 P2 P3 P4 P5 P6
VIDEO1 0 0 0 0 0 0
VIDEO2 1 0 1 0 0 0
VIDEO3 1 1 1 1 0 0
VIDEO4 0 1 0 1 0 0
AVAUX11111 0
DIGI TAL IN 00
ANALOG IN 10
39
P7
0
0
0
0
0
0
0
(c) DSP:YSS912 (X08:IC51)OUTPUT PORT :OPORT0~7
*1: ANALOG INPUT or DIGITAL INPUT with except STEREO mode
*2: DIGITAL INPUT with STEREO mode
*3: CD2/TAPE2 MONITOR is set CD2 position and L2,R2(REC OUT of CD2/TAPE2) of NJU7312AL is always
used by '0'.
KRF-V7772D(K)COVER1,1( 99.10.2910:11AM y[W 19