Tuner Unit Adjustment (X86-367 K, R Type); Tuner Unit Adjustment (X86-367 E, M Type) - Kenwood KVT-915DVD Service Manual
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- Instruction manual (122 pages)
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TUNER UNIT Adjustment (X86-367 K, R type)
Item
1. Video detection
1. Turn VR103 [RF-AGC] fully to clockwise.
coil L103
2. Apply approximately DC 2.0V to TP [IF AGC] (IC101 36pin).
3. Feed fo=45.75MHz, Mod=1kHz, AM60%, Level=100dBµ into TP [IF] (CF1 1pin).
4. Observe the TP [VIDEO] (IC101 8pin) waveform on the oscilloscope and adjust
2. Audio detection
1. Turn VR101 [RF-AGC] fully to clockwise.
coil L101
2. Feed fo=41.25MHz, No Modulation, Level=94dBµ into TP [IF : CF1 1pin].
3. Connect the voltmeter to TP [SIF : both ends of R107] and adjust L101 so that the
3. S-METER
1. Turn VR101 [RF-AGC] fully to clockwise.
VR102
2. Feed the 30dBµ 11CH color bar signal into the ANT input terminal.
3. Audio (P/S ratio -6dB) no modulation.
4. RF AGC
4. Connect the voltmeter to TP [S-METER : IC102 12pin] and adjust VR102 [SMET]
VR101
TE
L 13942296513
5. Set the RF signal to 70dBµ and adjust VR101 [IC101 12pin : RF-AGC] so that the
5. Diversity free run
frequency VR1
2. Connect to lead wire between CN5 3pin [IC2 8pin] and CN5 2pin [GND].
3. Adjust VR1 [15kHz] so as to obtain 15,734Hz±100Hz.
TUNER UNIT Adjustment (X86-367 E, M type)
Item
1. Diversity free run
frequency VR1
2. Connect to lead wire between CN5 3pin [IC2 8pin] and CN5 2pin [GND].
3. Adjust VR1 [15kHz] so as to obtain 15,625Hz±100Hz.
2. Audio detection
1. [TV signal =9ch, color bar signal, Level=70dBµ] into antenna terminal.
coil L101
2. Connect the voltmeter to TP [SIF : both ends of R107] and adjust L101 so that the
3. Diversity video
1. [TV signal =9ch, stair step signal, Level=70dBµ] into antenna terminal.
detection coil
2. Observe the TP [VIDEO : Q102 emitter between R108] waveform on the
L103
www
.
28
Adjustment method / Adjustment value
L101 so that the output level will be the maximum.
voltmeter reads 0V±0.01V.
so it reads 3.75V±0.05V.
voltmeter connected to TP [S-METER] reads 4.6V±0.05V.
1. Connect the frequency counter to CN5 1pin [IC2 7pin] and GND line.
Adjustment method / Adjustment value
1. Connect the frequency counter to CN5 1pin [IC2 7pin] and GND line.
voltmeter reads 0V±0.01V.
oscilloscope and adjust L103 so that the output level will be the following figure.
x
ao
y
i
NG
ADJUSTMENT
8
Maximum level
Q Q
3
6 7
1 3
u163
.
OK
NG
2 9
9 4
2 8
Conditions
• No ANT signal
• If the waveform is clipped,
slightly increase the DC
voltage.
• AC range
• No ANT signal
• Postpone adjusting VR101
to prevent AGC having
effect at 30dBµ.
• Ensure the RF AGC adjust-
ment is performed after the
1 5
0 5
8
2 9
9 4
S-METER adjustment.
• No ANT signal
Conditions
• No ANT signal
• PAL B/G
• P/S ratio 10dB
• PAL B/G
• Color off
m
co
9 9
2 8
9 9
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