Aiwa TV-AS216, Service Manual

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3-2. PIF VCO (PIF) Adjustment/Image Transfer Frequency Free Running Adjustment
[TV / Measuring instrument setting]
Input Signal Input level : 90dBuV
MODULATE : OFF
FREQUENCY : 45.75MHz
Test Point INPUT : TU101 11PIN/IF
OUTPUT : IC301 44PIN/AFT
SPEC 2.8
±
0.2VDC
Adjustment Point L205
MODE TUNER
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 Input level : 90dBuV
MODULATE : OFF
FREQUENCY : 4.5MHz
Test Point INPUT : IC301 52PIN/LIMIT IN
OUTPUT : IC301 54PIN/DEEMPHASIS
SPEC 4.0
±
0.2VDC
Adjustment Point L201
MODE TUNER
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 FREQUENCY : US 11ch (199.25MHz)
Test Point IC251 21PIN/L-OUT
SPEC 300mV
±
3mVp-p
MODE TUNER
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 or - key. (Fig. 3-4)
Fig.3-3
Fig.3-4
NTSC US MPX SOUND MODULATOR
Modulation 300Hz
Audio Manaural
Channel 199.25MHz
Image signal Color bar