Kenwood KTC-V300N, Service Manual, Page: 6 / 20

KTC-V300E/V300N/V300P
6
ADJUSTMENT
●
X34 Circuit Adjustment Specification
KTC-V300E
Item Adjustment Method and Adjustment Values Conditions
1. Video detection 1. Turn VR302 [RF-AGC] all the way to the right. • ANT non signal
coil adjustment 2. Apply DC 2.0V to TP [IF AGC] (IC301 #36) • If the waveform is
L301 3. Input fo=38.9MHz, Mod=1kHz, and AM60% Level=100dB
µ
for TP [IF] (A201 #6) clipped, slightly
4. Measure the waveform on TP [VIDEO] (IC301 #8) using oscilloscope, and adjust increase DC voltage
L301 to the maximum output level. • AC range
2. Sound detection 1. Turn VR302 [RF-AGC] all the way to the right. • ANT non signal
coil adjustment 2. Input fo=33.4MHz, and continuous wave level = 94dB
µ
for TP [IF] (A201 #6)
L302 3. Connect voltmeter to TP [S-IF] (both edges on R324) and adjust L302 at 0V
±
0.01V
3. S-METER 1. Turn VR302 [RF-AGC] all the way to the left. • Shift VR301 so that
adjustment 2. Input RF signal 30dB
µ
9CH color bar into the ANT input terminal AGC is not affected at
VR301 3. Sound (P/S ratio -10dB) Continuous wave 30dB
µ
4. RF AGC 4. Connect voltmeter to CN302 and adjust VR301 [SMET] at 3.7V
±
0.05V • Be sure to adjust
adjustment 5. Adjust RF signal at 70dB
µ
, and connect voltmeter to CN301 S-METER before
VR302 After turning VR302 [RF-AGC] all the way to the right, adjust VR302 [RF-AGC] until adjusting RFAGC
voltmeter value becomes 1.75V
±
0.02V
5. Diversity free-run 1. Short 2 and 3 pins at CN201
frequency 2. Connect frequency counter to CN 201 pin 1.
VR201 3. Adjust VR201 [15kHz] and set the value to 15625Hz
±
100Hz.
KTC-V300N
Item Adjustment Method and Adjustment Values Conditions
1. Video detection 1. Turn VR302 [RF-AGC] all the way to the right. • ANT non signal
coil adjustment 2. Apply DC 2.0V to TP [IF AGC] (IC301 #36) • If the waveform is
L301 3. Input fo=45.75MHz, Mod=1kHz, and AM60% Level=100dB
µ
for TP [IF] (A201 #6) clipped, slightly
4. Measure the waveform on TP [VIDEO] (IC301 #8) using oscilloscope, and adjust increase DC voltage
L301 to the maximum output level. • AC range
2. Sound detection 1. Turn VR302 [RF-AGC] all the way to the right. • ANT non signal
coil adjustment 2. Input fo=41.25MHz, and continuous wave level = 94dB
µ
for TP [IF] (A201 #6)
L302 3. Connect voltmeter to TP [S-IF] (both edges on R324) and adjust L302 at 0V
±
0.01V
3. S-METER 1. Turn VR302 [RF-AGC] all the way to the left. • Shift VR301 so that
adjustment 2. Input RF signal 30dB
µ
11CH color bar into the ANT input terminal AGC is not affected at
VR301 3. Sound (P/S ratio -6dB) Continuous wave 30dB
µ
4. RF AGC 4. Connect voltmeter to CN302 and adjust VR301 [SMET] at 3.7V
±
0.05V • Be sure to adjust
adjustment 5. Adjust RF signal at 70dB
µ
, and connect voltmeter to CN301 S-METER before
VR302 After turning VR302 [RF-AGC] all the way to the right, adjust VR302 [RF-AGC] until adjusting RFAGC
voltmeter value becomes 1.75V
±
0.02V
MAX
MAX