Panasonic CT-13R32CE, Руководство по обслуживанию

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Vertical Size
Service DAC Adjustment (C6)
Preparation:
Connect a monoscope pattern.
Procedure:
1.
In the Service Mode, select the Vertical Size
Adjustment DAC (C6). Adjust until a perfect circle
appears (Upper and lower sections of circle may
extend beyond the screen and therefore not
visible). See Fig. 24.
2. EXIT the Service Adjustment Mode.
DC Power Panel Adjustment
(CT-13R52DE)
Preparation:
1.
Connect the ground lead of a 12VDC (10Amp
capability) power supply to pin 5 of the car cord DC
plug. Connect the positive (12VDC) to pin 4 of the
car cord DC plug.
2. Connect DVM positive (+) lead to TPP1 and
negative (-) lead to P5 (GND) on the P-Board.
Procedure:
1.
Turn Receiver ON. Set picture to minimum and
leave Receiver on for 10 minutes prior to making
adjustments.
2. After aging, apply a monoscope pattern.
3. Verify that the applied power is at 12VDC.
4. Set PICTURE and BRIGHTNESS controls to
minimum.
5. Turn R855 (on P-Board) fully counterclockwise.
6. Monitor the DVM reading at TPP1 while turning
R855 clockwise and stop adjusting when DVM
reads 131.0V ± 1.0VDC.
7. Return PICTURE and BRIGHTNESS controls to
normal settings.
8. Vary the power supply from 10VDC to 16VDC and
confirm that B+ voltage at TPP1 is less than
133VDC.
9. Confirm that current is less than 6Amp at 12VDC
power supply input.
10. Return controls to normal.
Clock Adjustment (X3)
Preparation:
Connect the frequency counter from TP5 (IC001
Pin 11) to cold ground ( ).
Note: Frequency Counter probe capacitance should
be 8pF or less.
Procedure:
1.
Turn the Receiver “OFF” with the AC
power applied.
2. Measure TP5 (IC001 pin 11) for the frequency of
the waveform and record the reading.
Note: Pin 11 measurement must have at least four
digits of resolution following the decimal point.
Example: 000.0000
3. Turn the Receiver back “ON”.
4. Place the Receiver into Service Mode for making
electronic adjustment, select the Clock Adjustment
DAC (X3).
5. Calculate and set X3 based on the following
formula:
Note: Pin 11 measurement will not change
regardless of the value stored in X3.
Service Adjustments (Mechanical Controls)
Focus (part of T551)
Preparation:
Connect a Signal generator and select a dot pattern.
Procedure:
Adjust the FOCUS control VR to obtain the sharpest
and clearest dot pattern.
a. Adjust for best center.
b. Adjust for best area between the center and
top right corner.
Figure 23. Horizontal Centering
Figure 24. Vertical Size
X3
128 0.9
6
×
10
TP5
125 –
( ) { }
125
----------------------------------- + =