Kenwood KTC-V300E Service Manual page 6

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