Kenwood KTC-V500E Service Manual page 5

X25 Circuit Adjustment Specification (K : For North American Markets)
Item
1. Video detection coil 1. Turn VR301 [RF-AGC] fully to the right.
adjustment 2. Apply DC2.0V to TP [IF AGC] (IC300 pin36).
L303 3. Feed fo=45.75MHz, 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.
2. Audio detection coil 1. Turn VR301 [RF-AGC] fully to the right.
2. Feed fo=41.25MHz, No Modulation, Level=94dBµ into TP [IF] (A100
adjustment
L300 pin8).
3. Connect a voltmeter to TP [SIF] (both ends of R314) and adjust L300 for
0V ± 0.01V.
3. S-METER adjustment 1. Turn VR301 [RF-AGC] fully to the right.
2. Feed a 30dBµ 11CH color bar RF signal into the ANT input terminal.
VR300
4. RF AGC adjustment 3. Audio (P/S ratio -6dB) no modulation.
VR301 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 4.5V ± 0.05V.
5. Diversity free run 1. Connect a frequency counter to CN400.
frequency adjustment 2. Using the remote control unit TV/NAVI button, switch to adjustment
VR400 mode.
3. Adjust VR400 [15kHz] so as to obtain 15734 ± 10Hz.
X25 Circuit Adjustment Specification (E : For European Markets)
Item
1. Input RF signal 70dBµ 9CH stair step into the ANT input terminal.
1. Diversity video detection
coil adjustment 2. Observe the TP [VIDEO] (IC300 pin8) waveform on an oscilloscope and
L303 adjust L303 so that the edges of sync chip and pedestal are horizontal.
1. Input RF signal 70dBµ 9CH bar into the ANT input terminal.
2. Audio detection coil
adjustment 2. Connect a voltmeter to TP [SIF] (both ends of R314) and adjust L300 for
0V ± 0.01V.
L300
3. Diversity free run 1. Connect a frequency counter to CN400.
frequency adjustment 2. Using the remote control unit TV/NAVI button, switch to adjustment
VR400 mode.
3. Adjust VR400 [15kHz] so as to obtain 15625 ± 10Hz.
ADJUSTMENT
A djustment method / Adjustment value
A djustment method / Adjustment value
NG OK
KTC-V500E/N/P
No ANT signal
If the waveform is clipped,
slightly increase the DC
voltage.
AC range
Maximum
No ANT signal
ostpone 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
PAL B/G
Turn color off.
NG
PAL B/G
P/S ratio 10dB
No ANT signal
Test mode
Conditions
Conditions
5