Kenwood KRFV 7773 Service Manual

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KRFEV7773D(K) COVER1,1P( 5/10/00 6:23 PM N? 2 /\

KRF-V7773D/V7773D-B/V9993D

CONTENTS / ACCESSORIES / CAUTIONS

Contents
CONTENTS / ACCESSORIES / CAUTIONS ............. 2 PC BOARD .............................................................. 17
CONTROLS ........................... ...3 SCHEMATIC DIAGRAM .. 30

....e1
....63
...65

DISASSEMBLY FOR REPAIR
CIRCUIT DESCRIPTION.

EXPLODED VIEW ............
....5 PARTS LIST .......
..15 SPECIFICATIONS

ADJUSTM ENT ...............

WIRING DIAGRAM ................................................... 16

Accessories

I N
Remote control unit Batteries AM Loop Antenna FM Antenna

(A70-1313-05): RC-R0912

(A70 1344 05)- RC R0910 @ (T900852'05 (T90-0855-05)

Battery cover(A09-1166-08)

Remote control unit (PowerTouch)
(A70-1350-05): RC-R1011 AC plug adaptor .............. (1)
(A70-1351-05): RC-R1010 (E03-0115-05)

Use to adapt the plug on

fly the power cord to the
shape of the wall outlet.
(Accessory only for

regions where use is

r\
\/

necessary.)
Battery cover(A09-f177-08)
Pen(WOt-0976-08)
L J
Cautions
r \
®
DU nomv DE] DOLBY sunnoumn| I-DCD
DIGITAL PRo-Loelc
Manufactured underlicense from Dolby Laboratories. HDCDn High Definition Compatible Digitalu

Dolby , Pro Logic , AC-3 .andthe double»D symbol are
trademarks of Dolby Laboratories. Confidential Unpub-
lished Works. ' 19924997 Dolby Laboratories. All rights
reserved.

and Pacific MicrosonicsTM are either registered trade-
marks or trademarks of Pacific Microsonics, Inc. in
the United States and/or other countries. HDCD sys-
tem manufactured under license from Pacific Micro-
D I G l T A '7, sonics, Inc. This product is covered by one or more
of the following: IN the USA: 5,479,168, 5,638,074,
5,640,161, 5,808,574, 5,838,274, 5,854,600,
5,864,311, 5,872,531, and in Australia: 669114. Other
SURROUND patents pending.

Manufactured under license from Digital Theater Sys-
tems, Inc. US Pat. No. 5,451,942 and other world-
wide patents issues and pending. DTS and DTS
Digital Surround are trademarks of Digital Theater
Systems, Inc. ' 1996 Digital Theater Systems, Inc.
All rights reserved.

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KRF-V7773D/V7773D-B/V9993D

CIRCUIT DESCRIPTION

3. Test Mode

3-1 Entering the Test Mode
- While pressing the "INPUT SELECTOR DOWN" key, plug the power cord into AC wall outlet.
3-2 Cancelling the Test Mode
- Initialized and cancel the test mode if pulling out the power cord
- Not initialized and cancel the test mode if the power switch turns off.
3-3 Contents of the Test Mode
3-3-1 Key Operation
*The following operation is available when the FL is all lighting up mode only.

KEY OPERATION DISPLAY
SOUND Set up the RF frequency to 411.3MHz. RF 417.3MHz
LISTEN MODE Set up the RF frequency to 414.3MHz. RF 414.3MHz
INPUT MODE Set up the RF frequency to 411.3MHz. RF 417.3MHZ
SET UP Indicates Tuner destination on the FL. EX. TYPE E1 ->TYPE E2
MEMORY Changed dimmer off/1/20yclically. All FL light on->ALL FL light off
BAND KEY Indicates the u-com version. EX. Ver . XXXXXX-X

4. Main Microprocessor : uPD784215-GF570 (X13, ICZ3)
4-1 Main Microprocessor Periphery Block Diagram

PROTECTION

x11, iCa
x13, |081
SELECTOR IC x13, i022 FAN POWER R
mum LCD REMOTE SR RLY
r \ TRANSMIT lC
\ 2 x11, iC5 SELECTOR .c qu7215
X13 382 NJU71312
x25, IC4
x11, IC1 SELECTOR IC
x25, IC3 NJU71313
MUTING
VOL- '0 VOLUME IC
x11 1-094ng SUB .00," X08, IC40
030V304 uPD784036

VOLUME IC

794ng UART x25, ED1
VOLUME IC

TCQ459F . X25, lCt
(Main) u-com

. FL DRV
VOLUME [C uPD784215 GF570
uPD780204
TCQ459F
POWER
lNPUTUP/DOWN KEY
TONE CONTROL IO X13, |C71 PANEL KEY

TC9184

DESTINATION

X05, I02 TUNER UNlT PANEL DOOR
LC72131 /:

PLL for Remocon VIDEO
LV2105V SELECTOR IC

X13, IC1/5/7/8

BA7649

lR/RF Front/Rear
switch ROTARY IR RECEIVER
ENCODER

IR/RF Front/Rear

switch
6 RELAY CONTROL

l l A?

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KRF-V7773D/V7773D-B/V9993D

CIRCUIT DESCRIPTION

Y7DETECT(Pin72) = L

COMP A A COMP A B COMP A C COMP A D COMP A E
VIDE01 L L L L H
VIDE02 H H L L H
VIDE03 H L L L H
VIDEO4 L H H L H
AV-AUX L H L L H
DVD L H L H L
V MUTE L H L H H
- COMPiB(Pin17,18,19)
COMP_B_A COMP_B_B COMP_B_C
VlDEOf H H H
VIDE02 H H L
VIDEO3 L H L
VIDEO4 H L L
DVD L L L
- KRF-V7773D/VFI-4080
COMP_A Y_C SEL CTRL
A B C D E A B V_$EL A B
VIDE01 L L L L H L H L L L
VIDE02 H H L L H L H L L L
VIDE03 H L L L H L H L L L
VIDEO4 L H H L H L H L L L
AV-AUX L H L L H L H L L L
/\ DVD L H L H L H L L L L
K j V MUTE L H L H H H H L L L

8. DSP IC: ADSP-21065L(X08,IC21) CHECK METHOD

Note: This IC is scarcely damaged. Pay attention to poor soldering if replace it.

.Sel the selector to ANALOG(TAPE or TUNER). In this mode, Fs will be 48kHz.

. Set the mode to JAZZ CLUB.

. Check the square waveform which is 500HZ period at #76(FLG11) of to. It is good if #76 has the waveform.
. Check the waveform which is 30MHz at #30(CLK|N) of IC.

. Check the voltage which is 3.3V at #157(RESET) of IC

. Check the every ports which are 48MHz at #7(TFSO), #13(RFSt) and #18(TFSt) of IC

. Check the every ports which are 3.07MHz at #8(TCLKO) and #15(RCLK1) of IC.

8. Check the waveform which are data at #16(DR1A) of IC. Refer to figures.

xos ICZ1 wepin)
FLGtt waveform in JAZZ club selected to TAPE.

\ICDUIJBMN-e

SV/div. ZmS /dlv. 5V/dlv. ZuS/div. 5V/dlv ZuS/dlv.

CH1:
DATA

C H1 2
DATA

CH2:
BCK
CH3:
LRCK

CH2
BCK
CH3
LRCK

DATA waveform will change figure by trigger as above.

Check the AD converter and DIR and oscillation circuitry if you can get no good at above steps.
9. Check the waveform which are data at #11 (DTOA), #12(DTOB) and #22(DT1A) of to.
Check the DA converter and so if you can get step9, too.

13