Aiwa TV-AS216, Service Manual

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Simple Adjustment
[TV / Measuring instrument setting]
Adjustment Page No. RCO/R CUT OFF
GCO/G CUT OFF
BCO/B CUT OFF
GDV/G DRIVE
BDV/B DRIVE
Input Signal NTSC white luster
SPEC WHITE
MODE VIDEO
* Apply aging for approx. 20 minutes before adjustment.
* Repeat whole through the steps (1 to 6) for adjustment.
CUT OFF Adjustment :
1. Input white luster signal by the pattern generator.
2. Set the cutoff value of the most prominent color on the screen to “128”, and
adjust other two cutoff values in order to produce a white screen, using the
or - key on the jig remote control.
DRIVE Adjustment :
3. Use the or - key on the jig remote control to increase the
G DRIVE value so that the screen becomes reddish.
4. Then, lower the value till a green tinge disappears.
5. Use the or - key on the jig remote control to increase the B DRIVE
value so that the screen becomes bluish.
6. Then, lower the value till a blue tinge disappears.
7. Repeat the steps 1 to 6 so that the screen is tinged with white. (Fig. 2-6)
Note : After adjustment, be sure to apply SBT: Sub-Brightness Adjustment.
5-3. Tuning Adjustment
3-1. RFA RF AGC Adjustment
[TV / Measuring instrument setting]
Input Signal NTSC color bar (FULLFIELD)
Input level : 60dBuV
Channel : fp = 199.25MHz
Test point TU101 1PIN/RF AGC
SPEC 3.5
±
0.5VDC
MODE TUNER
1. Connect the digital voltmeter to the test point.
2. Input the specified input signal to RF ANT to receive 199.25MHz.
3. Use the or - key to adjust the voltage level at the test point to 3.5
±
0.5VDC. (Fig. 3-1)
[TV / Measuring instrument setting] RFA Simple Adjustment
Input Signal NTSC color bar (FULLFIELD)
Channel : 2CH (97.25MHz) or
3CH (103.25MHz)
Test point TP101/RF AGC
SPEC 2.00 to 2.40VDC
1. Connect the digital voltmeter to the test point.
2. Take a measurement of the electric field level of the acquired pattern generator.
3. Use the or - key to adjust the voltage level close or equivalent to
the electric field level specified in Fig. 3-2.
Fig.2-6
Fig.3-1
Fig.3-2
Electrical
field level
Voltage level