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3-2. PIF VCO (PIF) Adjustment/Image Transfer Frequency Free Running Adjustment
[TV / Measuring instrument setting]
Input Signal
Test Point
SPEC
Adjustment Point
MODE
1. Connect the oscilloscope to IC301 44 PIN.
2. Input the specified input signal to TU101 11 PIN, and adjust L205 so that the
voltage level of the IC301 44 PIN becomes 2.8 ± 0.2VDC.
3-3. SIF Audio IF Adjustment
[TV / Measuring instrument setting]
Input Signal
Test Point
SPEC
Adjustment Point
MODE
1. Connect the oscilloscope to IC301 54 PIN.
2. Input the specified input signal to IC301 52 PIN, and adjust L201 so that the
voltage level of IC301 54 PIN becomes 4.0 ± 0.2VDC.
3-4. ATT ATT Adjustment
[TV / Measuring instrument setting]
Input Signal
Test Point
SPEC
MODE
This adjustment requires NTSC US MPX SOUND MODULATOR.
1. Configure the NTSC US MPX SOUND MODULATOR setting. (Fig. 3-3)
2. Connect the oscilloscope to the test point.
3. Input the specified input signal to ANT, and adjust the voltage level of the test
point to 300m Vp-p, using the VOLUME + or - key. (Fig. 3-4)
Input level
: 90dBuV
MODULATE : OFF
FREQUENCY : 45.75MHz
INPUT
: TU101 11PIN/IF
OUTPUT : IC301 44PIN/AFT
2.8 ± 0.2VDC
L205
TUNER
Input level
: 90dBuV
MODULATE : OFF
FREQUENCY : 4.5MHz
INPUT
: IC301 52PIN/LIMIT IN
OUTPUT : IC301 54PIN/DEEMPHASIS
4.0 ± 0.2VDC
L201
TUNER
FREQUENCY : US 11ch (199.25MHz)
IC251 21PIN/L-OUT
300mV ± 3mVp-p
TUNER
– 45 –
NTSC US MPX SOUND MODULATOR
Modulation
300Hz
Audio
Manaural
Channel
199.25MHz
Image signal
Color bar
Fig.3-3
Fig.3-4
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