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RX-8020VBK
SERVICE MANUAL
AUDIO/VIDEO CONTROL RECEIVER
RX-8020VBK
Area suffix
UJ ---------- U.S.Military
A/V CONTROL RECEIVER
CATV/DBS VCR1 TV AUDIO
DVD DVD MULTI CD FM/AM
TV/DBS VIDEO CDR PHONO
VCR1 VCR 2 TAPE/MD USB
SURROUND DSP SURR/DSP ANALOG/DIGITAL
OFF INPUT
RX-8020V AUDIO/VIDEO CONTROL RECEIVER
ANALOG BASS
DIRECT BOOST FRONTˇL FRONTˇR
1 2 3
MENU FM/AM TUNING FM/AM PRESET FM MODE
SOUND TEST CENTER SUBWFR
4 5 6 STANDBY
MASTER VOLUME
ENTER
MEMORY
DIMMER SURRˇL SURRˇR
7/P 8 9
STANDBY/ON
MUTING DIGITAL EQ SBACKˇL SBACKˇR
10 0 +10
RETURN FM MODE 100+ SPEAKERS ON/OFF
CATV/DBS 1
CONTROL
DVD MULTI DVD VCR 1 VCR 2 VIDEO TV SOUND/DBS
SURROUND/DSP INPUT DIGITAL LEVEL
SURROUND DSP OFF ANALOG/DIGITAL EQ ADJUST ANALOG DIRECT
CH/ LEVEL TV VOL VOLUME 2
TV/VIDEO
INPUT ATT
TEXT SUBWOOFER OUT ON/OFF SOUCE NAME
DISPLAY MENU PLAY EXIT VIDEO
EFFECT SETTING BASS BOOST
USB AUDIO
S-VIDEO VIDEO L--AUDIO--R PHONO CD CDR TAPE/MD USB AUDIO FM/AM
REC /REW PAUSE FF/
PAUSE CONTROL
PUSH OPEN DOWN UP
SET
DOWN TUNING UP SOURCE NAME
SLEEP
STOP CONTROL
PHONES
RM-SRX8020J REMOTE CONTROL
Contents
Safety precautions --------------------------------------------------------1-2
Disassembly method -----------------------------------------------------1-3
Adjustment method -------------------------------------------------------1-9
Self-diagnose function-----------------------------------------------------1-10
Description of major ICs -------------------------------------------------1-12~31
No.21161
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
Oct. 2002
RX-8020VBK
Adjustment method
Tuner section
1.Tuner range
FM 87.5MHz~108.0MHz
AM(MW) 531 kHz to 1 602 kHz (at 9 kHz intervals)
530 kHz to 1 600 kHz (at 10 kHz intervals)
Power amplifier section
Adjustment of idling current
Measurement location B2204-B2205(Lch) , B2213-2214(Rch)
Adjustment part VR787(Lch) , VR788(Rch)
Attention
This adjustment does not obtain a correct adjustment value immediately after the amplifier is
used (state that an internal temperature has risen).
Please adjust, after you turn off amplifier and internal temperature falls.
1.Set the volume control to minimum during this adjustment.(No signal & No load)
2.Set the surround mode OFF.
2.Turn VR787 and VR788 fully counterclockwise to warm up before adjustment.
If the heat sink is already warm from previous use the correct adjustment can not be made.
3.For L-ch,connect a DC voltmeter between B2204 and B2205 (Lch)
And,connect it between B2213 and B2214(Rch).
4.30 minutes later after power on, adjust VR787 for L-ch, or VR788 for R-ch so that the DC voltmeter
value has 1mV~10mV.
* It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable
resistance (VR787,VR788) in the direction of counterclockwise.
Heat sink
Rch amp. board
VR788 (Rch)
B2213, B2214
Lch amp. board
VR787 (Lch)
B2204, B2205
1-9
RX-8020VBK
Self-diagnose function
1. Detection of abnormal power supply and voltage
When the power is turned ON, if an abnormality is detected during the signal input at the A/D port (IC901,
pin 2-5, 7) for one second continuously, the status will become STANDBY mode immediately.
When the power is turned ON again, detection of abnormal power supply and voltage will not be carried out
during the first 4 seconds.
Given below is a list of threshold values at the detection of abnormalities.
At abnormal state At normal state At abnormal state
(Low voltage) (High voltage)
Pin 2 Analog value Analog value Analog value
Micro-computer+5V 0 - 2.2V 2.2 - 2.8V 2.8 - 5.0V
Pin 3 Analog value Analog value Analog value
Digital+5V 0 - 2.2V 2.2 - 2.8V 2.8 - 5.0V
Pin 4 Analog value Analog value Analog value
Analog+5V 0 - 2.2V 2.2 - 2.8V 2.8 - 5.0V
Pin 5 Analog value Analog value Analog value
+12V 0 - 2.2V 2.2 - 2.8V 2.8 - 5.0V
Pin 7 Analog value Analog value Analog value
Tuner+9V 0 - 2.2V 2.2 - 2.8V 2.8 - 5.0V
2. Initial setting on ship
To gain the initial setting on ship, put the power plug in the socket while pressing "DOWN" key and "UP" key
together simultaneously, then turn the power ON.
3. Test mode
To enter the test mode, put the power plug in the socket while pressing "EFFECT" key and "UP" key together
simultaneously, then turn the power ON.
Workings of test mode:
All FLs are turned ON for 3 seconds. (the FLs, which are divided in two groups, are turned ON alternatively)
A Faster volume UP/DOWN operation can be achieved with the remote controller.
When the power is turned OFF, the test mode will be released.
The FL display returns to normal after the three seconds. Then the STANDBY LED is turned ON (flashing
ON and OFF for each one second) to show the present status being a test mode.
1-10
RX-8020VBK
4. Self-diagnose
To enter the self-diagnose mode, put the power plug in the socket while pressing "SETTING" key and "UP" key
together simultaneously, then turn the power ON.
While the working status is being displayed, the each item can be switched with the UP/DOWN key
operation.
When the power is turned OFF, the self-diagnose mode will be released.
During the self-diagnose mode, the STANDBY LED is turned ON (flashing ON for one second then OFF for
three seconds).
FL transient display will be carried out as follows. When the transient display is not carried out,
normal display/workings are carried out.
S 0 0 0 1 Information on VERSION of system microcomputer (IC901)
2 0 0 2 0 2 2 0 9 Example : 2002/2/20 9th ROM
D1 V e r 1 . 0 0 Display the local version (IC581)
Example : Ver_1.00
D2 0 2 / 0 2 / 1 0 Display the local creation date
Example : 2002/2/10
D3 D S P R e v 4 1 Display the DSP version (IC511)
Example : DSP Rev41
D4 A N A L O G x x Display the input sources
D I G I T A L 1
D I G I T A L 2 However, since it is the source of DIR processing, actual source may be
D I G I T A L 3 contradicted.
D I G I T A L 4 Example : ANALOG08
D I G I T A L 5
D I G I T A L
D5 U N L O C K
Display the input Fs
F s 3 2 k H z Example : Fs48kHz
F s 4 4 k H z
F s 4 8 k H z
F s 9 6 k H z
N G D A T A
D6 U N L O C K Display the input format
P C M
A C 3 Example : PCM
A C 3 - E X
D T S
D T S - E S M
D T S - E S D
A A C
M P E G
N G D A T A
D7 U N L O C K Display the input channel
1 / 0 . 0
2 / 0 . 0 Example : 2/0.0
2 / 0 . 0
2 / 0 . 0
3 / 0 . 0 L t
2 / 1 . 0 D M
3 / 1 . 0
2 / 2 . 0
3 / 2 . 0
N G D A T A
1-11
RX-8020VBK
Block diagrams
LVA10336-6
COMPU LINK
TEXT LINK
Monitor out
7.1ch
Preout
DVD
STB
CN393
LVA10220-1 LVA10221-1
5 CN392
IC399 SBL/SBR
RL/RR
FRONT Y/C
C/W
L/R
Q761
IC389
IC390
CN711
CN701
TEXT Lch
FW881
CN881
CN243
Q763
IC396
IC397
IC398
CN244 CN242
CN731
LVA10338-1
TEXT TEXT
IC388
L/R LVA10338-7
CN240
MONI
CN241
DATA S video
(Refer to the following page.)
C
LVA10336-5 LVA10221-2
CN712
CN702
CN732
Q762
CN205
Vido5, 6 Rch
RL/RR
Q764
CN201
IC384
IC381
IC382
IC383
4 Vido5, 6
FRONT VIDEO L
CN200 CN204 CN206 RY831 SPK1
R
Vido5, 6
L/R
C
RL/RR
SBL/SBR
Video LVA10220-2
(Refer to the following page.)
R L
LVA10336-4
L
CN813
CN823
CN721
SBL/SBR
CN501
L RY832 SPK2
RL/RR
DSP CLK
CN601
R
IC380
L/R
SW
AUDIO
C
AUDIO R
CN587 CN581
LVA10220-3
DSP
(Refer to the following page.)
3 Cch
CN722
CN713
CN703
LVA10337 Q1751 C
CN381 RY851 CENTER
DVD SUB WOOFER
Q1752
CN303
DATA V SIG
FRONT AUDIO
DVD CENTER
CN814
CN824
IC901
CN313 CN371 CN416
CPU
RL
AUDIO REAR L
Video audio RR
DVD REAR
RR RY852
MAIN_STK,
CLK,DAT
(Refer to the following page.) REAR R
V SIG
CN723
LVA10336-3 RL
IC386
CN301
LVA10336-1
CN361
LVA10220-4
DATA
CN311 CN351
LVA10336-2
TUNER
2
MAIN_STK,
CLK,DAT
AUDIO
V SIG
DVD REAR
IC 303
CN715
CN705
TUNER
RLch Q1851
SUB WOOFER
CENTER
EQ SOURCE SELECTOR Q1853
IC 304
DVD
IC 301 IC 302
DVD
PHONO
L/R
CD
L/R
P.B
REC
P.B
REC
REAR
TAPE
TAPE
CDR
CDR
DVD
LVA10218-1
CN101
Y/C
CN716
CN706
CN111 VIDEO Q1852
RRch
CN406
AUDIO Q1854
FM
TUNER
AM/FM DET TUNER
IC102 RF 101 USB USB DAC
CN400 IC 410
1 MW RF
& OSC AM LVA10221-5
PLL FL DISPLAY
T111
DATA IC121 DI400
LVA10009
CN410
SYSTEM CONTROLLER
IC 400
KEY
A B C D E F G 2-1
RX-8020VBK
Standard schematic diagrams
Power supply section
Power trans1 board Power trans2 board Power/fuse board
5
131 PW10 PW20
132
PW11
113 F4
PW21
CN811
PW27 PW17
112 PW12
PW22
Power supply board Sheet 2/10 111
PW23
PW13
123
PW24
F61
122 PW14 PW25
VS1
4 F62
121 QSW0812-001