PAL CHROMA ADJUSTMENTPROTECTOR PERFORMANCE CHECK
No. Adjusting pointAdjusting procedure/conditionsWaveform and others No. Adjusting pointAdjusting procedure/conditionsWaveform and others
1Sub-colour1. Receive the PAL Colour Bar signal.1Beam protector1. Receive the Monoscope Pattern signal.
adjustment: 2. Set to the P-NORM mode.2. Set the contrast control to maximum.
I2C bus3. Connect the oscilloscope to TP852 (RED cath-CyGB3. Set the brightness control to maximum.
adjustmentode). (Use a 10 : 1 probe.)4. Make a short-circuit between the collector and
E Range: 2 V/div.emitter of Q851, Q852 or Q853 and make sure
E Sweep time : m20 sec/div.that the protector is activated and the stand-by
mode is called.
4. Using the remote controller, call the sub-colour
adjustment mode. Adjust the sub-colour data so
that the 75% white and red portions of the PWYA100%WLMg R2High-voltage1. Receive the Monoscope Pattern signal.
colour bar be at the same level. See Fig. 7.protector2. Connect the bias box to the cathode (R635 side)
5. Clear the adjustment mode.Fig. 7of D607.
3. Adjust the bias box voltage to 18 V and make sure
that the protector is not activated.
4. Adjust the bias box voltage to 27 V and make sure
that the protector is not activated.
3Other protec-1. In checking the performance of other protectors
torsN for example, the one against shorting of
smoothing electrolytic capacitor of +B line N, pay
attention not to damage or deteriorate any related
element.
9
NTSC CHROMA ADJUSTMENT
No. Adjusting pointAdjusting procedure/conditionsWaveform and others
A/V INPUT AND OUTPUT CHECK
1Sub-tint1. Receive the NTSC 3.58 Colour Bar signal in the
adjustment:A/V mode.(B�Y)No. Adjusting pointAdjusting procedure/conditionsWaveform and others
IC bus2. Connect the oscilloscope to pin (36) of IC801(B-A2
1Video and1. Receive the Colour Bar (100% white colour bar,
adjustmentY) .
Baudio output400 Hz, 100% modulation audio) signal.
E Range: 20 mV/div.
Ccheck2. Terminate the video output with a 75 ohm imped-
E Sweep time : m20 sec/div. (Use a 10 : 1 probe.)
ance. Make sure the output is as specified
(1.0 Vp-p ?3 dB).
3. Adjust the sub-tint data to obtain the waveform
3. Terminate the audio output with a 10k ohm im-
as shown in Fig. 8.pedance. Make sure the output is as specified
4. Clear the adjustment mode.W Y Cy G Mg R B
(1.76 Vp-p ?3 dB).
Fig. 8
A=B=C
2Video and1. Using the TV/AV key on the remote controller,
audio inputmake sure that the modes change in the order of
checkTV, AV and TV again and that the video and au-
dio outputs are according to the input and output
terminals for each mode.
20CT-250
9-19-2 |
ACEC
SHARP
