KTC-V500E/N/P
5
ADJUSTMENT
NG
OK
NG
X25 Circuit Adjustment Specification (K : For North American Markets)
Item
A
djustment method / Adjustment value
Conditions
1. Video detection coil
adjustment
L303
1. Turn VR301 [RF-AGC] fully to the right.
2. Apply DC2.0V to TP [IF AGC] (IC300 pin36).
3. Feed fo=45.75MHz, Mod=1kHz, AM60%, Level=100dB
µ into TP [IF]
(A100 pin8).
4. Observe the TP [VIDEO] (IC300 pin8) waveform on an oscilloscope and
adjust L303 for maximum level.
Maximum
No ANT signal
If the waveform is clipped,
slightly increase the DC
voltage.
AC range
2. Audio detection coil
adjustment
L300
1. Turn VR301 [RF-AGC] fully to the right.
2. Feed fo=41.25MHz, No Modulation, Level=94dB
µ into TP [IF] (A100
pin8).
3. Connect a voltmeter to TP [SIF] (both ends of R314) and adjust L300 for
0V
± 0.01V.
No ANT signal
3. S-METER adjustment
VR300
4. RF AGC adjustment
VR301
1. Turn VR301 [RF-AGC] fully to the right.
2. Feed a 30dB
µ11CH 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 70dB
µ and adjust VR301 [RF-AGC] so that the
voltmeter connected to CN300 reads 4.5V
± 0.05V.
ostpone adjusting VR301
to prevent AGC having effect
at 30dB
µ.
Ensure the RF AGC
adjustment is performed
after the S-METER
adjustment.
5. Diversity free run
frequency adjustment
VR400
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 15734
± 10Hz.
No ANT signal
Test mode
X25 Circuit Adjustment Specification (E : For European Markets)
Item
A
djustment method / Adjustment value
Conditions
1. Diversity video detection
coil adjustment
L303
1. Input RF signal 70dB
µ 9CH stair step into the ANT input terminal.
2. Observe the TP [VIDEO] (IC300 pin8) waveform on an oscilloscope and
adjust L303 so that the edges of sync chip and pedestal are horizontal.
PAL B/G
Turn color off.
2. Audio detectioncoil
adjustment
L300
1. Input RF signal 70dB
µ 9CH bar into the ANT input terminal.
2. Connect a voltmeter to TP [SIF] (both ends of R314) and adjust L300 for
0V
± 0.01V.
PAL B/G
P/S ratio 10dB
3. Diversity free run
frequency adjustment
VR400
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
± 10Hz.
No ANT signal
Test mode