Kenwood RXD-790 User manual

MINI HiFi COMPONENT SYSTEM
RXD-790/V860/V890
SERVICE MANUAL
(XD-790/V860/V890)© 1997-9/B51-5357-00 (K/K) 1586
3 ¡ 7 2 1
O.T.E. DUBBINGREC/ARM DOLBY NRREV. MODE
A/B
0
PUSH
OPEN
0
PUSH
OPEN
0
6 ¢ 7 4
DISC
SKIP
DISC SELECTOR TIME DISP. OPEN/CLOSE
DISC 1 DISC 2 DISC 3
D
O
W
N
U
P
C
L
A
S
S
I
C
E
Q
.
O
F
F
EX.BASS
STEREO SRS 3D PRO LOGIC
DOLBY
3 STEREO MODE
INPUT
DISPLAY BEST HITS
DEMO
AUTO POWER
SAVE
MIC MIX.
MIN. MAX.
MIC1 MIC2 PHONES
ON/STANDBY
AUTO ENTERBAND
POPROCK M/R
RESET
∞
MINI HiFi COMPONENT SYSTEM
MULTI CONTROL
/
VOLUME
TUNING
Front glass
(B10-2391-02) Panel (A60-1245-11) Knob
(K29-6864-03)
Knob*
(K29-)
Knob
(K29-6759-12)
Front glass
(B10-2282-12)
Cassette lid
(A53-2019-12)
Knob
(K29-6866-02)
Lighting board
(B19-1563-13)
Knob
(K29-6863-03)
Knob
(K29-6832-13)
Phone jack
(E11-0280-05)
Knob
(K29-6832-13)
Knob
(K29-6865-02)
Knob
(K29-6832-13)
Knob
(K29-6865-02)
Front glass
(B10-2283-12)
Cassette lid
(A53-2020-12)
Knob
(K29-6861-04)
Illustration is RXD-790.
* Refer to parts list on page 62.
KENWOOD-Corp. certifies this equipment conforms to DHHS Reg-
ulations No. 21 CFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 2

RXD-790/V860/V890
2
CONTENTS / ACCESSORIES
Contents
Accessories
Remocon configuration System configuration
CONTENTS / ACCESSORIES .................................. 2
EXTERNAL VIEW.......................................................3
DISASSEMBLY FOR REPAIR....................................4
BLOCK DIAGRAM......................................................5
CIRCUIT DESCRIPTION ...........................................6
ADJUSTMENT..........................................................13
WIRING DIAGRAM...................................................17
PC BOARD ............................................................. 19
SCHEMATIC DIAGRAM.......................................... 31
EXPLODED VIEW ................................................... 59
PARTS LIST..............................................................62
SPECIFICATIONS....................................................75
Please confirm that the following accessories are present.
FM indoor antenna ............(1)
(T90-0801-05) Loop antenna ....................(1) (T90-0820-05)
AM loop antenna stand .....(1)
(J19-3645-05)
Speaker cords ................... (2)
(E30-5120-08)
Remote control unit ..........(1)
(A70-1160-05) : RXD-790..........RC-790
(A70-1161-05) : RXD-V860........RC-V860
(A70-1162-05) : RXD-V890........RC-V890
Speaker stabilizer..............(8)
(G11-2345-04)
Battery cover (A09-0380-08)
Batteries (R6/AA) ..............(2)
AC plug adapter................. (1)
(E03-0115-05)
REMOTE CONTROL UNIT
N.B.
SLEEP
INPUT
DISC SKIP
O.T.E.
REPEATRANDOMEDITP. MODE
BAND
P. CALL
CD
TUNING
PTY
TAPEA/B
TA/NEWS
/INFO.
RDS
DISPLAY
EX.BASSSRS 3D
AUTO
VOLUME
EQ.
PTY
SEARCH
1 2 3 4 5 6 7 8 9
0+10
MUTE
PART NAME MODEL NAME
A70-1160-05 RXD-790
A70-1161-05 RXD-V860
A70-1162-05 RXD-V890
SYSTEM MAIN UNIT SPEAKER SPEAKER
XD-790 RXD-790 LS-N850 CRS-N850
XD-V860 RXD-V860 LS-N850 –
XD-V890 RXD-V890 LS-N850 CRS-N850
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 3

RXD-790/V860/V890
3
EXTERNAL VIEW
ANTENNA
AM
FM
300Ω
FM
75ΩGND
R L
AUX
INPUT
R L
AUX
OUTPUT
SUPER
WOOFER
PRE OUT
FRONT
SPEAKERS
(6-16Ω)
SURROUND
SPEAKERS
(8-16Ω)
CENTER
SPEAKER
(8-16Ω)
+ -
AC220-
240V
~
AC110-
120V
~
R L
+ - - +
R L
+ - - +
Metallic cabinet
(A01-3532-01)
Lock terminal board
(E70-0057-05)
Lock terminal board
(E70-0054-05)
Lock terminal board *
(E70-0057-05)
Lock terminal board
(E20-0476-05)
Phono jack
(E63-1001-05)
Phono jack
(E63-0200-05)
Slide switch
(S62-0001-05)
Power cord bushing
(J42-0083-05)
AC power cord *
(E30-)
Illustration is RXD-790.
* Refer to parts list on page 62.
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 6

RXD-790/V860/V890
4
DISASSEMBLY FOR REPAIR
★Remove main PCB's, then connect between
PCB GND and chassis with alligator clip.
1. How to remove the main PCB.
(1) Remove the 4 screws 1.
(2) Remove the 9 screws 2.
(3) Lay the rear panel with left side downward on the
small box .
2. How to remove the front panel.
(1) Remove the 3 screws 1.
(2) Remove the 5 screws 2.
★Remove the deck mechanism only with the fixed
frame on the panel.
3. How to remove CD mechanism
(After remove the front panel)
(3) Remove the 5 screws 3, then remove CD mecha-
nism(4) with the laid set.
(4) Assemble the front panel then check (+) position.
★Connect between video out terminal GND and unit
chassis with alligator clip.
A
1
11
A
2
22
2
2
x2
x4
x3
1
2
2
2
2
2
x2
4
5
3
x2
3
3
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 7

(X08)
(X09)
RXD-790/V860/V890
(X32)
(X09)
(X14)
T25-0050
(CDM-27)
MECHA. A,B
(X28)
(X05-466) (K,M,X)
(X05-475) (V)
SUR. 20V/8C ch S ch 20V/8
(X05) (X08)
AUDIO OUT
OTHER CH
24.5V/6
17.2V/6FRONT
2ch
5V
9V
RF
D.P.S.S
HIGH SPEED
REC SIGNAL
XLON
MDP
SPOB
L,R
LED A,B
SOL-
MOTOR-
MOTOR B
MOTOR A
P.H A,B
VR5,6
A PB
B R/P
IC DATA1
E STB
IC DATA
IC CLK
RM:ON/OFF P/R NR:ON/OFF BIAS:ON/OFF B:120/70 A:120/70 A/B
BIAS SW
580mV
0dBS
PB OUT
REC IN
PASS
DCL
REC
PB
VR3,4
REC OUT
BIAS TRAP
B PB AMP
LEVEL
VR7,8
A
PB
IC2
A PB AMP
-22dBS
60mV
B ERASE
SRC
OFF
ON
TAPE
TUNER
CD
AUX
AM:180mV/3.3k
FM:600mV/3.3k
TUNER OUTPUT
IC4
BA3126N
70u
120u
B
A
B
PB
LEVEL
VR1,2
IC3
Ω
Ω
Ω
Ω
Ω
Ω
Ω
RXD-790/V890
PRE OUT
RXD-790/V890
RXD-790/V890
RXD-V860/V890
Rch
SEL
/75
1Vp-p
2V/1k
C
S
S
IC10
IC7
SUR. 2ch
200mV/1.1k
AUX OUT
AUX OUT
MUTEATT
ATT MUTE
PAL/NTSC
EHPASIS
MECHA.A,B
MUTEATT
IC3(1/2) IC6(1/2)
IC6(2/2)IC3(2/2)
OUT
VIDEO
IC5
IC4
IC8
(AC10V)
Q13,14
D12
AVR
(W02)
CD
VIDEO
IC7
P/C
EXPANDER
SERE PARA.
IC9
DAC
PCM
IC14
IC10
u-COM
VIDEO-CD
IC5
IC2
IC1
DOLBY
LOGIC
PRO
E-VOL
Q1Q9
Q2Q10
-
+CENTER SP
Q1,2Q3,4
IC3
EXPANDER
AVR
Q61
AVR
Q60,63Q56
AVRAVR
MUTE
Q7-10
Q10,11
IC1 HA12209F
MS
IC2IC1
MAIN
u-COM
A1 ED1
SENSOR
REMOTE FL DISPLAY SPEANA
POWER SUPPLY
FINAL
TR-12V
D28D25,26D20
-30V12V5.6V
IC9
AC
AMP
MAIN
Q5-16
SP.OUTPUT
WOOFER
SUPER
PHONES
SURROUND
SP.
+
+
-
-
R
L
SP.
MAIN
R
L
+
-
-
+
IC5
N.B
GE.
CANCEL
VOICE
VOL.
ELECTRIC
IC2-4
SRS
5V
u-COM
MOTOR
12V
DSP
5.6V
SW1-SW5
P/C
IC6
CONTROL DSP POWER
DRIVER MUTE
RESET
IC2
CXD2500BQ
DSP/DAC
IC1
RF AMP/SERVO
CXA1782BQ
LA6537
IC9
LD SW CONTROL
NJU3713D
S/P
ROTARY MOTOR SPEED CONTROL
L.M DRIVER
LOADING
ROTARY
DRIVER
R.M
TRAVERSE UNIT
D40-1500
START
LIMIT SW
FOCUS
TRACKING
CONTROL
DRIVER GAIN
IC3
4ch BTL DRIVER
D.M DRIVER
DISC MOTOR
DRIVER
FEED MOTOR
F.M
COIL
DRIVER
TRACKING COIL
COIL FOCUS COIL
DRIVER
LD
SW
Q5
LD
F
E
C
B
A
IC5
BA10393
Q3,4
Q1,2
IC6
NJU3714D
MS MAIN
+5V
OUT
L1
MPX
L.P.F.
CHANNEL
OTHER
DOLBY
Q5
CONTROL
BIAS
BEAT CANCEL
Q7,8
OSC
BIAS
AUX IN
AUX IN
200mV/47k
MIC1,2
1.6mV/2.2k
MIC
INPUT
SEL.
IC1
VR1
IC8
IC7
MIC
ECHO
MIXING
IC6
(2/2)
MIC AMP
IC6
(1/2)
BLOCK
TUNER
RXD-790 (X32) : Refer on page5 (X32) of RXD-500/700 servi manual (B51-5300-05)
RXD-V860 (X092) : Refer on page5 (X09) of RXD-500/700 servi manual (B51-5300-05)
(X08) : Except RXD-V860
Ω
Ω
Ω
Ω
RXD-790/V860/V890
5
BLOCK DIAGRAM
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 10

RXD-790/V860/V890
6
CIRCUIT DESCRIPTION
1. Initialization
1-1 Setting of initial conditions
While pressing the [ENTER] key, plug the AC cord into the AC power outlet.
1-2 Initializing operation
•A microcomputer is initialized for start when the AC power is turned on while pressing the [ENTER] key. At that time, CD
mechanism are also initialized.
•During the initial operation, the display shows “INITIALIZE”and after that the clock blinks up on display.
1-3 Initial items and back up data
ITEMS
★ POWER OFF
★ VOLUME 15
★ BALANCE CENTER
MUTING OFF
★ EQ OFF
★ EQ. MANU FLAT
AMP ★ EX. BASS ON
★ SRS 3D OFF
★ INPUT SEL TUNER
★ AUX INPUT 0 (-6dB)
★ REC LEVEL -17
N. B. OFF
ECHO NONE OFF
★ 3D LEVEL 0
★ REF/MANU REF
★ DEMO ON
★ D-SURROUND OFF NONE
★ D-3STEREO OFF NONE
★ CENTER NORMAL NONE
★ CEN LEVEL 0 (-10dB) NONE
★ SUR LEVEL 0 (-10dB) NONE
ITEMS
★ BAND FM
★ LAST f LIMIT
TUNER ★ LAST Pch — —
★ AUTO/MONO AUTO
★ Pch TEST f
★ CLOCK AM 12 : 00
★ PROG ON AM 12 : 00
CLOCK ★ PROG OFF AM 12 : 00
TIMER ★ PRO MODE PLAY
★ SOURCE TUNER
★ Pch 1
★ EXE OFF
★ OTT OFF
SLEEP OFF
★ DIRECTION FORWARD
★ RVS MODE p
DECK ★ DOLBY NR OFF
A/B B
ACTIVE MODE STOP
PLAY MODE TRACK
REPEAT OFF
CD RANDOM OFF
PLAY MODE STOP
TIME SINGLE
★ A/NTSC/PAL NONE AUTO
VIDEO-CD AUTO PBC NONE ON
DIGEST NONE OFF
MEM STOP NONE OFF
1-4 Mechanism initialization
1-4-1 CD mechanism
•Disc unclamps (traverse down)
•Rotary tray rotates (1/3 rotation)
•If a mechanism error occurs, “C”is indicated on the display.
1-4-2 DECK mechanism
•When initial condition becomes NG for the third time, decide the error.
The error condition is displayed as "X" on the display.
1-4-3 Error display
C ERR or X ERR
★ back up data
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 11

RXD-790/V860/V890
7
CIRCUIT DESCRIPTION
Desti- DSW Receiving frequency Channel PORT
nation 3(D23) 2(D22) 1(D21) 0(D20) Band range space IF RF 47
K1 0 0 0 0 FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 0
AM 530kHz~1700kHz 10kHz +450kHz 10kHz 0
K2 0 0 0 1 FM 87.5MHz~108.0MHz 100kHz +10.7MHz 25kHz 1
AM 530kHz~1610kHz 10kHz +450kHz 10kHz 0
E1 0 0 1 1 FM 87.5MHz~108.0MHz 50kHz +10.7MHz 25kHz 0
AM 531kHz~1602kHz 9kHz +450kHz 9kHz 0
5. Test mode
5-1 Test mode of the receiver
5-1-1 Setting of the test mode
While pressing the [INPUT] key or [Band] key, plug the
AC power cord in AC outlet.
5-1-2 Canceling of the test mode
Unplug the AC power cord.
5-1-3 Condition in test mode
POWER • • • • • • ON
SELECTOR • • • AUX (in case of [INPUT] key)
TUNER (in case of [BAND] key)
FL, LED • • • • • All the fluorescent display indicators
and LEDs light. (The all illuminated
state is cleared by pressing any main
unit key or remocon key.
EX. BASS • • • • • OFF
REC LEVEL • • • All position 0dB (REC 80)
5-1-4 Sub clock osculation diagnosis
Sub clock oscillation be diagnosed OK and NG before
input test mode.
ERR1 : OSC non active
ERR2 : Frequency NG.
5-1-5 All RAM clear
While pressing [3STEREO] key or [HIT MASTER] key,
plug the AC power cord into AC power output, the all
RAM cleared.
5-1-6 Basic operation in test mode.
(1) The muting during mode selection is not controlled in
the test mode.
(2) The REC out level is fixed to 0dB (MAX).
(3) The test mode is cancelled when the AC power is
turned OFF.
(4) The operation of the keys in the test mode, as follows.
5-1-7 The operation of the keys in the test mode.
(1) DISP/DEMO key
When this key is pressed in the test mode, all the flu-
orescent light off and normal display are indicated
cyclically.
(2) DISC 1~3 keys
With the selector on AUX, when the DISC 1~3 keys
are operated, the 3D level settings can be made as
follows.
1DISC 1 • • • • • • 3D ON level -10 (Min)
2DISC 2 • • • • • • 3D ON level 0 (Center)
3DISC 3 • • • • • • 3D ON level +10 (Max)
4. Destination list of tuner
DIODE SW : 0 = Without diode (When static, input low)
I = With diode (When static, input high)
2. KEY MATRIX
3. TUNER preset frequency
Refer to RXD-500/700 service manual (B51-5300-00), if need TUNER preset frequency K1 and K2.
KR0 KR1 KR2 KR3
41 42 43 44
KEY1 97 PIN B PACK B PLAY STEREO F REC
KEY2 96 PIN A PACK A PLAY SD R REC
KEY3 95 PIN POWER A/B/BEATC INPUT POP
KEY4 94 PIN EQ. OFF MANU/REF CLASSIC ROCK
KEY5 93 PIN DSW3 DSW2 DSW1 DSW0
KEY6 92 PIN TEST (RDS) DSW6 DSW5 DSW4
KEY7 90 PIN ¢ (CD) DISC SKIP 6 (CD) OPEN/CLOSW
KEY8 89 PIN TIME DISP 4 (CD) 7 (CD) DISC3
KEY9 88 PIN 7 (DECK) £ (DECK) ¡ (DECK) ™ (DECK)
KEY10 87 PIN OTE (DECK) DUBBING REC/ARM 1 (DECK)
KEY11 86 PIN DISC1 REV MODE DOLBY NR DISC2
KEY12 85 PIN TUNING UP BAND AUTO BEST/ECHO/A
KEY13 84 PIN SRS 3D 3 STEREO ENTER MODE/OTT
KEY14 83 PIN RESET EX.BASS/PRG DISPLAY STEREO/BEST
KEY15 82 PIN TUNING DOWN PRO LOGIC
No. of : Port No. of (X14)IC1 u-COM.
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 14

RXD-790/V860/V890
8
CIRCUIT DESCRIPTION
PLL
LC72131
EXPANDER IC
NJU3711
EXPANDER IC
NJU3714D
CD
MECHANISM
UNIT
CDM-27
DECK
MECHANISM
GT-E5000
SYSTEM IC
HA12209F
PARALLEL-SERIAL
TC74HC166AP
SELECTOR
NJU7313
SYSTEM IC
LC75393E
KEY
MATRIX
13SCAN 4RETURN
SPEANA
BA3834S
STB
RECEIVER SECTION IC_CLK/DATA
CE
PH
GRID (10)
(X14) IC1
(X14) IC2
(X32) IC2
(X32) IC6
(X28) IC1
(X28)
IC6
(X32)
IC5
(X14) ED1
(X09) IC1
(X09) IC5
(X05) IC2 SEGMENT (42)
POWER
MUTE
ST. CLEAR
M38199MF-069FP
M38198MCA-807FP
FIP10HMW6R
CD DSP
CXD2509Q
FL
MAIN
u-COM
CD
DECK
EXPANDER
SERI PARA
EXPANDER
SERI PARA
PRO LOGIC
DOLBY
C,S VOL.
SEL.
ST P.LOG.
VIDEO CD
µ-COM
VIDEO CD
(W02-)
CD
MECHANISM
(CDM-27)
DAC
4ch BTL
RF SERVO
DSP
(X32) IC2
(X32) IC1
(X32) IC2
4ch BTL
(X32) IC3
RF SERVO
(X32) IC1
(X32) IC14
(X32) IC10
(X32) IC6,7,9,
CD/VIDEO CD
(X08) IC7
(X08) IC4
(X08) IC2
(X08) IC1
DOLBY PROLOGIC
(X14) IC5
(3) CD STOP key
With the selector on TUNER, when the [CD STOP]
key operated, the preset memory can be changed
as 10 steps.
î10 – – î20 – – î30 – – î40 – – î00 (– –)ì
(4) AUTO, TUNING UP/DOWN
With the selector on something other than TUNER,
the E.Q (Flat, Min, Max) settings can be made by
pressing the [AUTO] key and the tuning [UP]
[DOWN] keys.
[AUTO] key E.Q Flat
TUNING [DOWN] key E.Q Min
TUNING [UP] key E.Q Max
(5) CD SKIP UP/DOWN keys
With the selector on TUNER, the P. CALL is operat-
ed by pressing the skip UP/DOWN keys.
SKIP [UP] key P.CALL up
SKIP [DOWN] key P. CALL down
(6) CD OPEN/CLOSE keys
With the selector on TUNER, the channel space
(emphasis) settings can be mad cyclically by press-
ing the OPEN/CLOSE keys with E1 and K2 version.
(7) Other keys
During the test mode, it can be operated in a special
manner that is different from an ordinary operation
by using the keys on the main body, specifically as
shown in the following table.
TAPE
KEY
INDICATION
OFVOL.
VALUE
Pressmodekeyin theAUXmode
1time
2 times
BALANCE
INPUTLEVEL
RVS MODE
1
L
-13
DOLBY NR
44 (MID)
CENTER
-4
A/B
86 (MAX)
R
+2
DUBBING
-8
O.T.E
-3
6. Main microprocessor M38198MCA-807FP (X14: IC1) : RXD-790
M38199MF-069FP (X14: IC1) : RXD-V860/V890
6-1 Microprocessor periphery block diagram
OPERATION KEY DISCRIPTION
CD ¢CENTER LEVEL UP
CD 4CENTER LEVEL DOWN
TAPE ¡REAR LEVEL UP
TAPE 1REAR LEVEL DOWN
RXD-790/V890
RXD-790 RXD-V860 RXD-V890
CD O
CD/VIDEO CD O O
DOLBY PROLOGIC O O
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 15

RXD-790/V860/V890
9
CIRCUIT DESCRIPTION
Pin No. I/O Name Description
1 I BP-IN Speana input (A/D convertor input)
2 I CW Rotary encoder input B
3 I CCW Rotary encoder input A
4 I A-PH A photo sensor input
5 I B-PH B photo sensor input
6 I HEAD PHONE Head phone sw input H : ON L : OFF
7 O DOLBY ST Surround IC(LV1016/LA2786) strobe
8 I/O SEL ST Selector IC(NJU7313) strobe
9 O IC-DATA Selector/PLL/E. Volume/Expander IC (data)
10 O IC-CLK Selector/PLL/E. Volume/Expander IC (Clock)
11 O E ST Expander IC (NJU3711/NJU3713/NJU3714) strobe
12 O SANYO CE System IC(LC75393(/PLL(LC72131)/E. vol(LC7536) CE
13 I PLL DO PLL data input
14 O DAC ST DAC(PCM1717E) strobe
15 O C BUSY VCD busy output
16 O VCD CLOCK VCD clock
17 O C DATA VCD data output
18 I M DATA VCD data input
19 O CD-CLK CD DSP clock (CXD2509Q)
20 O SQCK Sub cord clock(CXA 1782BQ, CXD2509Q)
21 O CD-DATA CD IC DATA
22 I SUBQ Sub code data
23 O CD-XLAT CD latch output (CXA1782BQ, CXD2509Q)
24 I SENSE CD sense input (CXA1782BQ, CXD2509Q)
25 O PS-LOAD Parallel serial IC load H : Shift L : Load
26 I PS-SIN Parallel serial IC data
27 O E. VOL ATT E. Vol attenuation H : ON L : OFF
28 O IC-CLR Expander IC reset H : Normal L : Reset
29 I CE Power failure input H : AC ON L : AC OFF
30 I SCOR Sub code synchronism signal (CXD2509Q)
31 O A MUTE Mute control H : OFF L : ON
32 I REM Remote control input
33 I PROTECT Protection input H : Protect L : Normal
34 I M BUSY VCD board u-COM busy input
35 I RESET Reset H : Normal L : Reset
36 I Xcin Timer clock input/output(32.768kHz)
37 O Xcout
38 I Xin Main clock input/output(8.38MHz)
39 O Xout
40 Vss (GND)
41~44 I KR0~KR3 Key return 0~3 H : ON
45~54 O 1G~10G FL grid 1G~10G
55~73 O SEG41~SEG23 FL segment SEG41~SEG23
74~76 O SEG22/BP OUT3~SEG20/BP OUT1 FL segment SEG22~SEG20/band pass control 3~1
77~81 O SEG19~SEG15 FL segment SEG19~SEG15
82 ~90 O SEG14 / KEY15/~SEG6/KEY7 FL segment SEG14~SEG6/Key scan KEY15~KEY7
91 Vcc u-com power supply
92 ~ 97 O SEG5/KEY6/~SEG0/KEY1 FL segment SEG5~SEG0/Key scan KEY6~KEY1
98 Vee Pull down power supply
99 AVss A/D GND
100 Vref A/D reference voltage
6-2 Pin description
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 18

RXD-790/V860/V890
10
CIRCUIT DESCRIPTION
EMPHASICE
ECHO A
ECHO B
POWER
SRS LED
3ST LED
PRO LED
H.TAP
DC OFF
DOLBY
SP RELAY
CS RELAY
A SOL
A CPM
B SOL
B CPM
BEAT CANCEL
R/P
RMUTE
A/B
BIAS
NR
D-R/P
LMUTE
LDC
PMON
CD VMUTE
NTSC/PAL
BRKM
LMF
RMR
LMR
RMF
CD MUTE
AUTO/MANUAL
CD RST
UNLOAD
LOAD
NC
MUTE
+3.3C
UP SW
DN SW
LMT SW
EMPHA
DPSS
NC
NC
PAL/NT
PS SW
ST SW
NC
SIN LOAD CLK LOAD CLK
AM
LW/SW
MONO
FM
ATT
IF ON
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
B01
B02
B03
B04
101
102
(X05) IC2
(X09) IC5
(X08) IC1,2
(X08) IC4
(X09) IC1
(X32) IC14
SI
(X32) IC6 (X32) IC7
QH
(X32) IC5
(X32) IC9
(X28) IC6
(X14) IC5
EX ST
SEL ST
DOLBY ST
DAC ST
SANYOU CE
RXD-V860/V890
RXD-790
/V890
IC CLK IC DATA
CLR
SYSTEM IC
LC75393E
DOLBY IC
LV1016
LA2786
C.S VOL IC
LC7536
INPUT SEL IC
NJU7536
DAC IC
PCM1717E
PARALLEL
SERIAL
PARALLEL
SERIAL
TC74HC166 TC74HC166
NJU3713
NJU3714
NJU3714 PLL IC
LC72131
DO
7. Expander IC
7-1 Expander port connection
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 19

RXD-790/V860/V890
11
CIRCUIT DESCRIPTION
Pin No. Name I/O Description
1 BEAT-C O Beat cancel H=ON L=OFF
2 R/P O REC/PLAY changeover H=REC L=PLAY
3 RMUTE O REC MUTE H=OFF L=ON
4 A/B O A/B play changeover H=B L=A
5 VSS GND
6 BIAS O BIAS changeover H=ON L=OFF
7NR O Noise redaction changeover (DOLBY) H=ON L=OFF
8 D-R/P O Dolby REC/PLAY changeover H=REC L=PLAY
9 LMUTE O LINE MUTE H=OFF L=ON
10 SO O Shift resister data output
11 DATA I Data input
12 CLK I Clock
13 STB I Strobe
14 CLR I Data clear
15 VSS GND
16 A-SOL O A deck solenoid control H=ON L=OFF
17 A-CPM O A deck motor control H=ON L=OFF
18 B-SOL O B deck solenoid control H=ON L=OFF
19 B-CPM O B deck motor control H=ON L=OFF
20 VDD Power supply(5V)
Pin No. Name I/O Description
1 SRS_LED O SRS LED H=ON L=OFF
2 3ST_LED O 3STEREO LED H=ON L=OFF
3 PRO_LED O PRO LOGIC LED H=ON L=OFF
4 H.TAP O HIGH TAP control H=ON L=OFF
5 VSS GND
6 DC_OFF O CD DSP power supply H=OFF L=ON
7 DOLBY O DOLBY ON/OFF (LOW TAP) H=ON L=OFF
8 SP RELAY O SP relay control H=ON L=OFF
9 CS RELAY O CS SP relay control H=ON L=OFF
10 SO O Shift resister data output
11 DATA I Data input
12 CLK I Lock
13 STB I Strobe
14 CLR I Data clear
15 VSS GND
16 EMPHASIS O FM emphasis changeover H=100k L=50kHz
17 ECHO A O ECHO Control H=ON L=OFF
18 ECHO B O ECHO Control H=ON L=OFF
19 POWER O Power supply control H=ON L=OFF
20 VDD Power supply (5V)
7-2 Expander IC port description
7-2-1 Display section NJU7314(X14 : IC5)
7-2-2 DECK section NJU7314(X28:IC6)
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 22

RXD-790/V860/V890
12
CIRCUIT DESCRIPTION
Pin No. Name I/O Description
2 EMPHASIS I VCD emphasis H=EMPHA ON L=OFF
3 DPSS I DECK non music (black) cletect H=MUSIC L=NON MUSIC
4NC I GND
5NC I GND
10 PAL/NTSC I VCD board visual mode H=PAL L=NTSC
11 PSSW I CDM-27 MECHA position sw H=OFF L=ON
12 STSW I CDM-27 MECHA stop sw H=OFF L=ON
14 NC I GND
Pin No. Name I/O Description
1 BRKM O Rotary motor control brake H=BRAKE L=NORMAL
2 LMF O Loading motor control(CW) H=ON L=OFF
3 RMR O Rotary motor control(CCW) H=ON L=OFF
4 LMR O Loading motor control (CCW) H=ON L=OFF
5 VSS GND
6 RMF O Rotary motor control (CW) H=ON L=OFF
7 CD MUTE O CD analog mute H=OFF L=ON
8 MANU/AUTO O TV changeover control H=MANUAL L=AUTO
9 CD _RST O CS DSP reset control H=NORMAL L=RESET
10 DATA I Data input
11 CLK I Clock
12 STB I Strobe
13 CLR I Data clear
14 LDC O CD LD control H=OFF L=ON
15 PMON O PMON control H=ON L=OFF
16 VMUTE O Visual mute control H=ON L=OFF
17 PAL/NTSC O PAL/NTSC changeover H=PAL L=NTSC
18 VDD Power supply(5V)
Pin No. Name I/O Description
2 UNLOAD I CD unloading sw H=ON L=OFF
3 LDSW I CD loading sw H=OFF L=ON
4NC I GND
5 MUTE I CD zero mute detect H=MUTE OFF L=MUTE ON
10 +3.3C I VCD power supply detect H=3.3V OFF L=3.3V ON
11 UPSW I CD up sw H=OFF L=ON
12 DNSW I CD down sw H=OFF L=ON
14 LMTSW I CD limit sw H=OFF L=ON
7-2-3 CD section (RXD-V860/V890) NJU7313D (X32 : IC9)
7-2-4 CD Section (RXD-V860/V890)
Input expander IC (parallel-serial) TC74HC166(X32 : IC6,7)
• IC 6
•IC 7
★ CD section (RXD-790) : refer to RXD-500/700 service manual (B51-5300-00) on page11.
RXD-790/V860(k)COVER( 97.11.283:55AM y[W 23

RXD-790/V860/V890
13
ADJUSTMENT
ANTENNA
AM
FM
300Ω
FM
75ΩGND
R L
AUX
INPUT
R L
AUX
OUTPUT
SUPER
WOOFER
PRE OUT
FRONT
SPEAKERS
(6-16Ω)
SURROUND
SPEAKERS
(8-16Ω)
CENTER
SPEAKER
(8-16Ω)
+ -
AC220-
240V
~
AC110-
120V
~
R L
+ - - +
R L
+ - - +
(A)
(B)
(C)
(E)
(D)
AG
AG
AG
FM-SG
FM-MPX
POLAR SG
FM-SG
FM-SG
AM-SG
AC voltmeter Oscilloscope Distortion meter Dummy antenna
Fig (a)
NO.
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
TUNER
SETTINGS
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1
DISTORTION
(STEREO)
(A)
98 MHz,
60dBµ(ANT INPUT)
1 kHz, ±67.5kHzDEV
PILOT:±7.5 kHzDEV
(B)
AUTO
98.0MHz
IFT (A1)
Minimum
distortion.
(a)
TO X05 CN1
9PIN (Lch)
11PIN (Rch)
10PIN (GND)
1. Tuner adjustment
RXD-790 COVER(-2 97.11.28 5:51 AM y[W 2

RXD-790/V860/V890
14
ADJUSTMENT
KEY
DISPLAY
OPERATION
PLAY/PAUSE
6+AC IN
5 01
SETTING OF THE TEST MODE
CANCEL THE CLAMP
TRAY 1 ROTATION
TRAYOPENSAUTOMATICALLY
STOP 7
5 01
TRAYCLOSE
CANCEL THE CLAMP
PLAY/PAUSE
6
5 05
PLAYMARK
ON 3
TRAYCLOSE/DISCCLAMP
05MODE
DISC3
5 03
PAUSEMARK
0N 8
TRAYCLOSE/DISCCLAMP
03MODE
(TRACKING SERVO OFF)
DISC1
5 16
DISC1 STOP
PLAYDISC2TRACKNO.16
DOWN
(SKIP DOWN)
4
5 32
DISC2 STOP
PLAYDISC1TRACK NO.32
DISC2
5 – –
CANCEL THE CLAMP
DISC STOPS IN THE DISC 3
POSITION
KEY
DISPLAY
OPERATION
TIMEDISP.
+ AC IN
CD 00
SETTING OF THE TEST MODE
CANCEL THE CLAMP
TRAY1/3ROTATION
TRAYOPENSAUTOMATICALLY
STOP 7
CD 00
TRAYCLOSE
CANCEL THE CLAMP
PLAY/PAUSE
6
CD 03
CD 05
TRAYCLOSE/DISCCLAMP
T-SERVO OFF(03) OR ON(05)
DISCSKIP
TRAY1/3ROTATION
DISC2
MECHA OK
CANCEL THE CLAMP
TRAY1/3ROTATION
DISC1
CD 01
CANCEL THE TEST MODE
2. Test mode of CD player
2-1 Mechanism
(1) Setting of the test mode
While pressing the [PLAY/PAUSE] key, plug the AC
power cord in AC outlet.
(2) Canceling of the test mode unplug the AC power
code.
(3)Operation
2-2 Main unit (X32)
(1)Setting of the test mode
While pressing the [TIME DISP] key, plug the AC
power cord in AC outlet.
(2)Canceling of the test mode press the [DISC 1] key or
unplug the AC power code.
(3)Operation
••
RXD-790 COVER(-2 97.11.28 5:51 AM y[W 3

RXD-790/V860/V890
15
ADJUSTMENT
CH1
RF signal
CH2
TE signal
VC
VC
(c) (d)
CN2
GND
+
_
L.P.F. +
+
L.P.F.
VTVM
VTVM
1
2
3
4
5
6
7
1.2 kHz
50 mVrms
(a) Laser Power
Pickup
0.05~0.15 mW
Optical power meter
(b) Tracking Gain Adj.
¶RF signal and TE signal in test mode (Focusing servo
ON / Tracking servo OFF). (Disc Type 4)
¶Adjust TE signal so that the waveform is symmetrical
in relation to VC. VR 2 (TE BALANCE)
¶RF signal in test mode (PLAY).
¶Perform the tangential and focusing offset are focused
into one point on the display. The crossing points
above and below the center shall also be looked clear-
ly.
No.
1
2
3
4
ITEM
LASER
POWER
TRACKING
ERROR
BALANCE
FOCUS
ERROR
BALANCE
TRACKING
GAIN
INPUT
SETTING
–
Test disc Type 4
Test disc Type 4
Test disc Type 4
Apply signal of
1.2kHz, 50mVrms
to CN2 pin5-6.
OUTPUT
SETTING
Connect an oscillo-
scope as follows.
CH1 : RF (CN2-1)
CH2 : TE (CN2-6)
GND : VC (CN2-4)
Connect an oscillo-
scope as follows.
CH1 : RF(CN2-1)
CH2 : FE(CN2-2)
GND : VC (CN2-4)
Connect a LPF to
CN2 pin 5-6 to
which connect an
oscilloscope or AC
voltmeters.
Set the senor sec-
tion of the optical
power meter on the
pickup lens.
PLAYER
SETTING
Press the"PLAY"key
to check that the dis-
play is "03".
Press the "PLAY"
key. Confirm the
display is"03".
Press the "PLAY"
key. Confirm that
the display is”05”
Press the "PLAY"
key. Confirm that
the displays”05"
ALIGNMENT
POINT
TE
BALANCE
VR2
FE
BALANCE
VR1
TRACKING
GAIN
VR3
–
ALIGN FOR
On the power
from.0.05 to
0.15mw. when the
diffraction grating is
correctly aligned
with the RF level of
0.8Vp-p or more
Symmetry between
upper and lower or
DC=0±25mV
Optimum eye pattern
Two VTVMs should
read the same
value.
FIG.
(a)
(c)
(d)
(b)
Note:
Type 4disc :SONY YEDS-18 Test Disc or equivalent.
LPF : Around 47kΩ+ 390pF or so.
3. Adjustment of CD player
Step 1~4 are in TEST MODE
TEST MODE : While pressing the (TIME DISP.) key, plug the AC power cord into the AC outlet.
RF signal : AC coupled
RXD-790 COVER(-2 97.11.28 5:52 AM y[W 6

RXD-790/V860/V890
16
ADJUSTMENT
No
<1>
<2>
<1>
<1>
<2>
ITEM
Demagnetization
and cleaning
Azimuth of the
REC/PLAY head
TAPE
SPEED(NORMAL)
PLAYBACK
LEVEL
BIAS CURRENT
INPUT
SETTING
–
TCC−153
MTT−114
10kHz, −10dB
TCC−110
MTT−111
SCC−1727
3kHz
(A)
Adjust the AG
for the output of
the DECK to
become 1kHz
-30dBs.
400Hz/10kHz
MTT−130
400Hz Adjust the playback output to -2.0dBs
OUTPUT
SETTING
–
(B)
(B)
(B)
(B)
DECK
SETTING
Power : OFF
Demagnetiza-
tion,cleaning,
PLAY
PLAY
PLAY
PLAY
REC
↕
PLAY
ALIGNMENT
POINT
Recording
head, erase
head,capstan
pinch roller
FWD RVS
A DECK
VR 5
B DECK
VR 6
A DECK
VR 7 (L)
VR 8 (R)
B DECK
VR 1 (L)
VR 2 (R)
VR 3 (L)
VR 4 (R)
ALIGN FOR
Demagnetize the
REC / PLAY head
with the head eras-
er.Clean the REC /
PLAY head, erase
head,capstan and
pinch roller using a
cotton swab slightly
damped with alcohol.
Adjust the output to
maximum and adjust
the azimuth adjust-
ment screw for the
Lissajours waveform
pattern of the oscillo-
scope to become
close to a 45°
straight line.
Adjust the tape
speed so that 3kHz
is obtained at the
center of the tape.
Record 1kHz and
10kHz alternately,
and adjust the bias
current adjustment
potentiometer for the
playback levels to
become the same.
FIG.
Unless otherwise specified, set the respective switches as follows: 0dBs=0.775V
TAPE : NORMAL DOLBY : OFF PLAY OUT : Lch (X28,CN6 4pin), Rch (X28,CN6 1pin)
ø.Cassette mechanism unit (Adjustment of the REC / PLAY head)
¿. PC BOARD ADJUSTMENT
¡. PC BOARD ADJUSTMENT
4. Cassette Deck adjustment
{
(A) (B)
X28, CN6
R IN R OUT
L OUT
L IN
GND
1
5
AC voltmeter AG Oscilloscope AC voltmeter
Frequency counter
RXD-790 COVER(-2 97.11.28 5:52 AM y[W 7

RXD-790/V860/V890 RXD-790/V860/V890
(X09- ) (D/5)
PRIMARY UNIT
PRIMARY UNIT
(X09- ) (D/5)
RXD-V890
USED RXD-790/
USED RXD-V860
SECONDARY UNIT
(X09- ) (B/5)
CONSTANT VOLTAGE UNIT
(X09- ) (E/5)
SWITCH UNIT
(X09- ) (D/5)
PRIMARY UNIT
RXD-790/V860/V890
(X09- ) (C/5)
(X32- ) (B/2)
SECONDARY UNIT
SURROUND UNIT
(X08-28XX-XX)
(X28-2880-20)
CASSETTE DECK UNIT
CASSETTE MECHA.
(D40-1510-X5)
NOT USED RXD-V860
USED RXD-V860/RXD-V890
AUDIO UNIT
(X09-4XXX-XX) (A/5)
USED RXD-V860/RXD-V890USED RXD-790
TUNER UNIT
(X05-46XX-XX)
(X14- ) (B/2)
DISPLAY UNIT (DECK, CD)
CD CHANGER
CD UNIT
(D40-1562-X5)
(D40-1542-X5)
(X32-3270-20)
CD UNIT
MECHA. : CDM-27
CD CHANGER
V-CD BOARD
(X32-3XXX-XX) (A/2)
MECHA. : CDM-27
(W02-2618-X5)
DISPLAY UNIT (AMP)
(X14-4XXX-XX) (A/2)
X09-4724-11(H) :
X05-4752-10
X14-4652-10
X32-3532-10
CN7
CN7
J6 FRONT
SPEAKERS
PHONES
MIC 1
J5
J3
J6
SPEAKERS
FRONT
SPEAKERS
SURROUND
E2
S1
SW
WH1
E1
MATRIX
E5
WH2
J4
E4
MIC 2
S2
CN7
POWER
TRANSFORMER
E6
CN4
WH3
E1
CN1
WH1
E3
J2
J1
CN18
E2
WH2
CN3
E1
WH1
(M,I) :
(K,M,I,X,H) :
RXD-V890
RXD-790
(V) :
CN5
X08-2800-20
X08-2800-20
X08-2832-10
WH2
J1
SUPER
WOOFER
(PRE OUT)
AUX INPUT
X09-4720-20
X09-4720-71
X09-4880-20
X09-4720-20
X09-4822-10
X09-4832-10
RXD-V860
RXD-790
RXD-V890
(X) :
(M,I) :
(V) :
(M,I) :
(V) :
(M,I) :
J2
AUX OUTPUT
(M,I) :
(K,H) : X05-4660-11
X05-4660-20
CN2CN1
(M,I) :
(M,I) :
(V) :
(V) :
X05-4660-20
X05-4660-20
X05-4752-10
(X) : X05-4660-71
(K) : X09-4720-11
FM
FM 75 Ω
J1
AM ANT
GND
300
RXD-V890
RXD-V860
RXD-790
CN19
E7
WH7
CN6
E4
WH4
E35-1760-05
CN1
(K) :
(X,H) :
(M,I) :
(V) :
(M,I) :
(V) :
(M,I) :
X14-4490-11
X14-4490-21
X14-4490-71
X14-4490-20
X14-4490-22
X14-4652-11
FL
CN5
CN1
E3
WH3
E1
X32-3440-20
X32-3440-20
X32-3532-10
E1
E8
WH5
E6
E2
WH2
E5
(V) :
(M,I) :
(M,I) :
RXD-V890
RXD-V860
E1
J2
WH1
CN7
VIDEO
OUT
(V) :
CN9
WH1WH1
WH1
CN7
WH8
CN13
RXD-V890
RXD-V860
RXD-790
Ω
V
V
V
V
(H)
AC220V 60Hz
(K) TYPE
V V
AC120V
60Hz
(V)
V V
(X)
AC220V 50Hz
AC240V 50Hz
(X,H,V) TYPE
1
2
F5
2
1
+Lch
-
-
Rch
+
+
-
Lch
-
+Rch
+Lch
-
-
Rch
+
1
ON
OFF
1
1
7
1
7
(M,I) TYPE
50/60Hz
220-240V
AC220-
240V
V V
1
2
WH8
WH7
AC110-120V/
F4
F5
AC110-
120V
WH6
WH5
F8
12
F1
F2
F3
1
F9
12
11
1
11
6
3
1
F6
6
CENTER
-
+
+
-
+
1 SURROUND Lch
2 SURROUND Rch
19114
91114
1
1
1
13
-
Lch
Rch
1
Lch
Rch
1
15
1
15
11
51
1
15
111
11 1 13
13
13
1
11
11
11
1
14
1
12
1
8
1
8
31
30
30
11
1
-CN1
-E1
14
X14-A/2
1
1
X09-A/5
14
1
12
V
V
VV
V V
VV
V V
V V
V
V
V V
V
V
V V
V
17 18
WIRING DIAGRAM
RXD-790/V860(K)SD2P-2 97.11.287:20AM y[W 2

ABDFHJCEGI
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
CASSETTE MECHANISM UNIT
(X28-2880-20) TUNER UNIT (X05-4660-11) : KH (X05-4660-20) : MI
(X05-4660-71) : X
(X05-4752-10) : V
19 20
RXD-790/V860(K)SD2P-2 97.11.287:20AM y[W 1

KMOQSLNPRT
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
21 22
CD MECHANISM UNIT (X32-3270-20) : RXD-790
RXD-790/V860(K)SD2P-2 97.11.287:52AM y[W 4

UV X Z AB ADW Y AA AC
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
23 24
AUDIO UNIT
(X09-48XX-XX) 80-20 [RXD-V860 (MI)]
32-10 [RXD-V860 (V)]
RXD-790/V860(K)SD2P-2 97.11.287:22AM y[W 3