Block Diagram - Kenwood LZ-601 Service Manual

LZ-601
PICTURE BRI
CONTROL
WHITH
BALANCE
ADJUSTMENT
No. ITEM
LINE
1
VOLTAGE
OSC&
PULSE
2
WIDE
CONTROL
3 H-POS
the inspection
2

BLOCK DIAGRAM

W201
VIDEO I/P
IC201 IC302
HIGH VOLTAGE
CONTROL
VIDEO PROCESS
W201
POWER SOURCE
R G B
DC 12V I/P
VGH +20V
VSH +14V
LCD MODULE
VGL -5V
VDD +5V
ADJUSTMENT
INPUT OUTPUT
SETTINGS SETTINGS
Connect a DC
– voltmeter to
L102 (output side)
Connect a
oscilloscope or
– frequency
counter to
Q101 (collector)
Puts a video
signal for
–
in VIDEO IN
IC301
SWITCHING
BACKLIGHT REGULATOR
DELAY CONTROL
CIRCUIT
IC101
SWITCHING PULSE
CONTROL
ALIGNMENT
ALIGN FOR
POINTS
1. Adjust SVR102 so that the
output-side voltage of L102 is
between 5.15 and 5.20V.
SVR102 2. After completing the adjust-
ment of SVR102, check the
voltages at D101, 102, 104
and 105.
1. Adjust SVR101 so that the
pulse duration is 13.5µsec
±0.4µsec.
SVR101
Instead, it is also acceptable
to adjust so that the frequency
counter reads 74kHz±2kHz.
Adjust so that figure comes
on the center position.
H-POS
D
(LCD UNIT)
T301
HIGH
VOLTAGE
OSC
H.V. TRAN
VOLTAGE
NFB
T201
Q101
PLUSE
AMP
SWITCHING
TRAN
VOLTAGE
NFB
STANDARD
L102 +5V : 5V +0.2V, –0V
D101 +14V : 14V±0.4V
D102 +20V : 20V +3V, –1V
D104 +30V : 30V +3V, –1V
D105 –5V : –5V±0.2V
13.5µsec±0.4µsec
2Vpp
13.5µS
NTSC : A : 3.0mm±1mm
B : 4.0mm±1mm
C : 18mm±1mm
A
D : 19mm±1mm
C
PAL : A : 4.0mm±1mm
B : 2.0mm±1mm
B : 20mm±1mm
B
B : 21mm±1mm
BACKLIGHT
LAMP
+30V
+14V
+20V
+5.3V
-5V
15Vpp