Matsui 1410R, Руководство по обслуживанию

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10
Electrical adjustments
Adjuntaments on the main panel
(fig.7.2).
1.1. +100V power supply voltage.
Connect a voltmeter (DC) across C2530.
Adjust R3518 for a voltage of +101V5 for 14" or +106V5
for 20" sets at back picture (beam current 0 mA).
1.2. Horizontal centring.
Is adjusted with potenciometer R3354.
1.3. Picture height.
Is adjusted with potenciometer R3410.
1.4. Focussing.
Is adjudted with potenciometer in the line output
transformer.
1.5. If filter (only for sets with SECAM LL' reception
possibility).
Connect a signal genetor (e. g. PM5326) via a
capacitor 5p6 to pin 17 of the tunner an adjust the
frequency for 33.4 MHz.
Connect an osciloscope to pin 1 of filter 1015.
Switch on the set and select a program with system
Europe (BG/L "low" for BGIDK reception).
Adjust L5040 for a minimum amplitude.
1.6. AFC.
a. For a sets with SECAM LL' reception possibility:
Connect a signal generator (e. g. PM5326) as indicated
in point 1.5. Connect a volmeter to pin 44 of IC7015/6A.
Adjust the frecuency for 38.4 MHz and a select a
program with system France (L/L' is "higt" for
reception).
Adjust L5040 for 3V5 (DC).
Next adjust the frecuency for 38.9 MHz. Select a
program Europe (L/L' is "low" for BG- ILDK reception).
Adjust L5043 for 3V5 (DC).
b. For sets without SECAM LL' reception possibility:
Connect a signal generator (e. g. PM5326) as indicated
above and adjust the frecuency for 38.9 MHz (for a
PAL I at 39.5 MHz). Connect a voltmeter to pin 44 of
IC7015/6A.
Adjust L5043 for 3V5 (DC).
1.7. RF AGC.
If the picture of a strong local transmiter is reproduced
distorted, adjust potenciometer R3021 until the picture
is undistorted.
Or: Connect a pattern generator (e. g. PM5518) to the
aerial amplitude=1mV.
Connect a multimeter (DC) at pin 5 of tunner.
Adjust R3021 so that voltage at a pin 5 of tuner
is 3V7 ±0V5(DC).
2. Adjustaments on the CRT panel (Fig. 7.1).
2.1. Vg2 cut-off points of picture tube.
Apply a pattern generator (e. g. PM5518) and a set it
to a white raster pattern.
Adjust contrast and Vg2 at minimum (Vg2 with
potentiometer in the line output transformer to the left).
Adjust brightness until the DC voltage across
potentiometer 3213 is 0V.
Adjust R3207 (B), R3220 (G) and R3234 (R) for a
black level of 115V on the collectors of transistors 7205,
7218 and 7227.
Adjust Vg2 potentiomete until the gun that first emits
ligth is just no longer visible. Adjust the two other guns
with the respective controls (3207 3220 or 3234)
until just no light will be visible.
2.2. Grey sacle (white D).
Apply a test pattern signal and the set for normal
operation. Allow the set to warm up for about 10
minutes.
Adjust R3213 and R3214 until the desired grey scale
has been obtained.
FIG. 7.1