Kenwood LZ-702IR Service Manual page 15

QQ
3 7 63 1515 0
Fig. 2 After TINT adjustment
TE
L 13942296513
Fig. 3 After PHASE adjustment
IR-TX (Infrared ray transmission) Frequency ad-
justment (X35-)
Adjustment procedure
Boot up in test mode.
Start the adjustment using TV code on the remote controller
(three-mode remote).
Initial configuration conditions
• Audio output is set normal
• V.Sel causes audio output to switching
www
• Surround is off
• Frequency is 2MHz
.
q Transmit infrared ray at the initial condition. Measure the
frequency of TP804 located closed to IC800 L_OUT (pin
9) using frequency counter, and adjust to 2.3MHz±50kHz
ADJUSTMENT
Ch1: Input
signal
Ch2:
B output
Ch3:
R output
Ch1: Input
signal
Ch2:
B output
Ch3:
R output
x ao u163
y
i
2 9
8
with VR800.
wTransmit infrared ray at the initial condition. Measure the
frequency of TP803 located closed to IC800 R_OUT (pin
8) using frequency counter, and adjust to 2.8MHz±50kHz
with VR801.
ePress "Tenkey" on the remote controller and switching to
3MHz mode.
rTransmit infrared ray at the condition of e. Measure the
frequency of TP804 located closed to IC800 L_OUT (pin
9) using frequency counter, and adjust to 3.2MHz±50kHz
with VR803.
t Transmit infrared ray at the initial condition. Measure the
frequency of TP803 located closed to IC800 R_OUT (pin
8) using frequency counter, and adjust to 3.8MHz±50kHz
with VR802.
Remote controller code
• Set the switch to "TV" on the remote controller.
Key code
Tenkey1 IR HEADPHONE Surround On/Off
Tenkey2 IR HEADPHONE 2MHz/3MHz
Tenkey3 IR HEADPHONE Normal/Off
Q Q
∗ IR: Infrared Ray
3 6 7 1 3 1 5
Flicker adjustment (X35-)
Conditions
Video source : VIDEO (composite signal)
Video : Luster white 30%~50%
BRIGHT : MAX (If using PWM control, it can not be
adjusted due to the frequency component)
MODE : ZOOM
Adjustment procedure
q Display luster white 30%~50%.
w Measure waveform using oscilloscope.
e Turn VR100 and adjust to make the amplitude of the wave-
form is at minimum.
(For NTSC signal, use 60Hz or 30Hz component.
For PAL signal, use 50Hz or 25Hz component.)
∗ Make sure that the flicker component level is adjusted
to minimum.
co
.
Oscilloscope rate: 20mV, 0.5mS
LZ-702IR
9 4 2 8
Item
0 5 8 2 9 9 4 2 8
m
9 9
9 9
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