TechInfo Sheet
Audio Visual
fax: 01344 853689
email: av.technical@mail.panasonic.co.uk
Product Group: VCR |
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Model: NV-SD450 |
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Date: 16/10/98 |
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Revision No: 01 |
Document No: 02 |
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Subject: Common Faults |
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Intermittent Loss of Colour or Picture Sync During Playback |
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SYMPTOM: |
During playback of a pre-recorded tape on to a digital TV occasional loss |
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of colour or sync disturbance (“Top Curl”) at the top of the picture may |
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occur. |
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CAUSE: |
The V sync signal is unstable when playing back some pre-recorded tapes |
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which contain special “copy-guarded” signal. |
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REMEDY: |
Add a new board (Part No. VEDMACRO) as shown on the attached sheet. |
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After installing this new board, check the playback picture after self |
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recording of colour bar signal. |
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If the sync disturbance “Top Curl” appears perform the following adjustment. |
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ADJUSTMENT PROCEDURE |
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1) |
After installing the new board, connect the oscilloscope to video out |
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and Pin 5 of PS301 for Y/C pack. |
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2) |
Make a self recording of colour bar signal. |
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3) |
If the sync disturbance at the top of the picture appears, check the |
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waveform on the oscilloscope and adjust the variable resistor on the |
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new board clockwise until normal waveform appears. |
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Panasonic CS U.K.
Document No: 02
Model: NV-SD450
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