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KTC-V500E/N/P
X25 Circuit Adjustment Specification (M : For the Other Markets)
Item
1. Video detection co il
adjustment
L303
2. Audio detection coil
adjustment
L300
3. S-METER adjustment
VR300
4. RF AGC adjustment
VR301
5. Diversity free run
frequency adjustment
VR400
6
ADJUSTMENT
Adjustment method/Adjustment value
1. Turn VR301 [RF-AGC] fully to the right.
2. Apply DC2.0V to TP [IF AGC] (IC300 pin36).
3. Feed fo=38.0MHz, Mod=1kHz, AM60%, Level=100dBµ into TP [IF]
(A100 pin8).
4. Observe the TP [VIDEO] (IC300 pin8) waveform on an oscilloscope and
adjust L303 for maximum level.
1. Turn VR301 [RF-AGC] fully to the right.
2. Feed fo=31.5MHz, No Modulation, Level=94dBµ into TP [IF] (A100
pin8).
3. Connect a voltmeter to TP [SIF] (both ends of R314) and adjust L300 for
0V ± 0.01V.
1. Turn VR301 [RF-AGC] fully to the right.
2. Feed a 30dBµ CHINA 9CH color bar RF signal into the ANT input
terminal.
3. Audio (P/S ratio -6dB) no modulation.
4. Connect a voltmeter to CN300 and adjust VR300 [SMET] so it reads
3.5V ± 0.05V.
5. Set the RF signal to 70dBµ and adjust VR301 [RF-AGC] so that the
voltmeter connected to CN300 reads 4.8V ± 0.05V.
1. Connect a frequency counter to CN400.
2. Using the remote control unit TV/NAVI button, switch to adjustment
mode.
3. Adjust VR400 [15kHz] so as to obtain 15625 ± 100Hz.
No ANT signal
If the waveform is clipped,
slightly increase the DC
voltage.
AC range
Maximum
No ANT signal
Postpone adjusting VR301
to prevent AGC having effect
at 30dBµ.
Ensure the RF AGC
adjustment is performed
after the S-METER
adjustment.
No ANT signal
Test mode
Conditions
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