Kenwood KVT 767 DVD Service Manual

Page 2

KVT-627DVD/627DVDY/717DVD
KVT-737DVD/747DVD/767DVD

NOTES ON ASSEMBLING THE MECHANISM

1. Fasten Screw A so that the interval (a) will be about 5.2mm
and the interval (b) will be about 2.6mm (The interval (a)
can be measured using a pair of vernier calipers or similar
tools.)

2. Turn B so that Position (0) will come at about the center of
interval (d).

3. Then, play the test disc and fine tune A or B so that the jitter
value would be minimized.

Page 11

KVT-627DVD/627DVDY/717DVD
KVT-737DVD/747DVD/767DVD

COMPONENTS DESCRIPTION

Ref. No. Application/ Function Opemtion/ Condition] Compatibility
0101 For DSI signal switching DSI signal control
0204 For LED switching Switching LEDiBIue / LED Green on MINLLCD
0205 For LED switching Switching LEDiBlue / LED Red on MINLLCD
0206 For LED switching Switching LEDiFIed /LEDiGreen
O ELECTRIC UNIT (X34-353/354x-xx)
Ref. No. Application/ Function Operation] Condition] Compatibility
I650 3-terminal regulator IC 8.4V for audio is generated from BU14V
l052 Power supply conversion IC :9.0V for 5V pre-out is generated Irom BU14V
|C54 3-terminal regulator IC 5V for video is generated from BUMV
IC100 Power IC Power amplifier for speaker output
IC150 Operational amplifier Audio mid-point electrical potential 3.3V, SVR voltage 6.8V buffer
IC151 Electrical volume and Selector IC Audio volume control, audio signal selection
ICZOO Operational amplifier For 5V pre-out audio signal amplification (Front)
l0201 Operational amplifier For 5V pre-out audio signal amplification (Rear)
ICZOZ Operational amplifier For 5V pre-out audio signal amplification (Sub-woofer)
ICZOS Isolation amp IC For audio signal GND isolation (AVIN2)
I0204 Isolation amp IC For audio signal GND isolation (AVIN1)
l0251 RDS decoder IC For FIDS signal processing and demodulation
ICSOO Voltage detector For p-com resetting voltage monitoring
I0301 Logic IC (NOR) Muting control for audio
ICBOS Audio microcomputer For X34 board control
IC400 Video switch For video signal selection (R)
IC401 Video switch For video signal selection (G)
IC402 Video switch For video signal selection (B)
IC403 Synchronization separation IC For NT/PAL recognition, AVIN/FIear camera auto detection
IC404 Video switch Video signal selection (Synchronization separation)
IC405 Isolation amp IC For audio signal GND isolation (TV)
|C406,407 Video switch Video signal selection (For monitoring main unit)
|C408 Video switch Video signal selection (For AVOUT)
IC413 Logic IC (Multiplexer) For audio signal selection (For MAIN source)
lC4t4 Logic IC (Multiplexer) For audio signal selection (For 2-ZONE sources)
IC415 Video switch Video signal selection (For monitoring main unit)
IC4t6 Video switch Video signal selection (For AVOUT)
ICSOO Isolation amp IC For audio signal GND isolation (LX)
IC501 Logic IC (Inverter) For reversing resetting signal
ICSOZ Logic IC (Buffer) Buffer for remote control signal for NAVI
l0504 Operational amplifier For DVD audio signal GND isolation (Right)
IC505 Operational amplifier For DVD audio signal GND isolation (LeIt)
Q1 For Ian 11V power supply Comes ON when 02 is ON
02 For Ian 11V power supply Comes ON when Q3 is ON
03 For Ian 11V power supply Comes ON when SW5V is ON

11

Page 35

KVT-627DVD/627DVDY/717DVD
KVT-737DVD/747DVD/767DVD

ADJUSTMENT

O Adjustment item

1 .

Chroma IC adjustment (X14)
(A remote controller is used for adjustment, while confirm»
ing on the waveform with an oscilloscope.)

. PLLiCLK/OSDHSYNC phase adjustment (X14)

(A variable resistor is used for adjustment while confirming
on the waveform with an oscilloscope.)

. Freerun adjustment (X35)

(A variable resistor is used for adjustment while confirming
on the waveform with an oscilloscope.)

. Flicker adjustment

(A remote controller is used for adjustment, while confirm-
ing on the waveform with an oscilloscope.)

. Screen position adjustment

(A touch panel is used for adjustment, while confirming the
screen.)

. Touch Panel Adjustment

(A touch panel is used for adjustment.)

1. Chroma IC Adjustment Procedure (X14)
1.While pressing on the [ATT] + [SRC] keys on the unit. re-
set to enter the Test Mode.
2. Press [DIRECT] key on the TV remote controller to get into
the Chroma IC Adjustment mode.
-> At this point CH : 16 VCO,FREERUN VAL 80 is dis-
played on upper left corner. (VAL value is displayed in HEX.)
3. Perform adjustments in Tables A~M in the order of a~c, one
by one.
a. Use [8] and [0] of 10Key to change the setting value. ->
The values in the VAL on the upper left corner of screen.
b. Press [PLAY/PAUSE] key to confirm the setting values.
a When confirmed, the color of CH :16VCOfiFREERUN
VAL 80 changes.
Press [PLAY/PAUSE] key once more to release.
c. Use [7] and [9] of 10Key to move to the next setting. ->
The CH value in the upper left corner of screen changes.
4. Press [DIRECT] key to write data to E2PROM.
5. Press [DIRECT] key again to move out of Chroma Adjust-
ment mode.
* Conduct this in AUDIO mode using TV/NAVI remote con-
troller.

Test Mode Adjustment Value
Adjustment Item Adjustment Method Condition
Display (Temporary)
A Chroma VCO CH : 16 Connect TP: HD between R249 and R250 and TP:VD NTSC type Input signal
Adjustment between R248 and R251 to GND. Measure TP:TCiHD of 15.734:50Hz : None
l0237 32 pin with a frequency counter. PAL type Input signal
15.625i50Hz : 10 STEP (NTSC)
F Y GCA CH :2 Monitor waveform of 59 pin TP:VG of CN905 with an 2.6V:0.05V 1Vpp V/S ratio
(Brightness Gain) oscilloscope and adjust the oscillation width of forward :7:3 (7552 terminated)
Adjustment rotation-side pedestal and forward rotation-side Step 10. X34 AVIN input
B Brightness CH :6 Monitor waveform of 59 pin TP:VG of CN905 with an 3.2Vi0.05V Oscilloscope range
Adjustment oscilloscope and adjust the oscillation width of forward : 500mV/DIV
rotation-side Step 1 and reverse rotation-side Step 1. AC
G Contrast CH : 13 Monitor TP: VG waveform of 59 pin of CN905 with an 3.0Vi0.05V
Adjustment oscilloscope and adjust the oscillation with of fonNard
rotation-side Step 8 and reverse rotation-side Step 8.
D Black Limiter CH :5 Maintain and confirm 7F and move on to the next step. 7F
Adjustment
E White Limiter CH : 10 Monitor waveform of 59 pin TP:VG of CN905 with an 3.2Vi0.05V
Adjustment oscilloscope and adjust the oscillation width of forward If lower than 3.2V,
rotation-side Step 9 and reverse rotation-side Step 9. finalize with 7F.
(However, 2.7V
or less is NG.)

35