RCA MR14V001 Service Manual
Colour Television Chassis: M123A
7. Electrical Diagrams
7.10 CRT Panel
49
Colour Television Chassis: M123A
7.11 Faultfinding and Test point with Waveform Diagram
Wave Shape
Freq.
NO .
Wave Shape
Hz
Period
Vpp
WF 1
WF 2
WF 3
WF 4
15.74
kHz
15.74
kHz
15.74
kHz
60
KHz
64
us
64
us
64
us
16.7
ms
2.77
V
10.88
V
925
V
135.7
mV
WF 5
WF 6
50
60
KHz
60
KHz
16.7
ms
16.7
ms
2.95
V
4.94
V
Colour Television Chassis: M123A
7.11. Faultfinding and Test point with Waveform Diagram
Wave Shape
NO .
WF 7
WF 8
WF 9
WF 10
Wave Shape
Freq.
Hz
15.74
kHz
15.74
kHz
15.74
kHz
60
KHz
Period
64
us
64
us
64
us
16.7
ms
Vpp
345
mV
319
mV
314
mV
174
mV
WF 11
51
15.74
kHz
64
us
93.2
V
Colour Television Chassis: M123A
8. PCB
8.1 Main PCB
52
Colour Television Chassis: M123A
8. PCB
8.2 CRT PCB
53
Colour Television Chassis: M123A
9. Alignment Procedures
1. FLOWCHART OF ALIGNMENT PROCEDURE
B+
Adjustment AGC
Center & Amplitude
and OSD adjustment
Pincushion correction &
Horizontal Amplitude
adjustment
Screen&
focus
Adjustment
White
Balance
Adjustment
SubÂbrightness
Adjustment
2 Adjustment of B+ voltage
1) Apply 120VAC(5V) to mains power input, and Philips standard testing pattern to RF input.
2) Adjust VR830 in STANDARD mode until voltage at TP2 (B+) is 106V 0.5V.
3. RF AGC adjustment
Observe monitor the collector waveform of Q101 with the probe of Oscilloscope as illustration
below. Select channel 2 (>70dB) from the antenna input. Enter D-mode, select menu6 to adjust
RFAGC item until the monitor peak value to 0.8V .
p-p
4. Screen & Focus voltage adjustment
--- Apply pattern signal in normal status, enter D-mode, press TV/AV button to turn off the
vertical output.
--- Adjust the SCREEN switch on the flyback transformer to make a horizontal shining line just
visible on the screen.
---Turn on the vertical output, adjust the FOCUS on the flyback transformer to obtain the
optimum focus.
5. White balance adjustment
1)Apply the black and white pattern in normal status;
2)Alignment of normal colour temperature
---- Change Colour Temperature to normal status
---- Use a colour analyzer to measure the black side of the screen. By changing the value of
RC, GC and BC, set the reading of the colour analyzer to X=284, Y=299.
---- Use a colour analyzer to measure the white side of the screen. By changing the value of
GD, BD, set the reading of the colour analyzer to X=284, Y=299
---- Separately set the brightness and contrast from min. to max., repeat the step 2 and 3 until
The reading of the colour analyzer is correct.
56
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