博世 安全产品说明书

September 6th Service Note
Pal-NTSC video mode detection and manual override of video mode
Date: September 6th 2010
Problem description
Under most circumstances a DIVAR recorder will automatically select the video mode suitable for the region where the recorder is being used.
However when no analog cameras are connected, the system is sometimes unable to detect the correct video mode. In this case the unit will just choose PAL video mode.
If you have an NTSC monitor attached to your recorder, it may have no visible display output. In this case the user can choose a preferred video mode during start up.
Systems affected
All DIVAR XF/700 Series recorders that do not have analog cameras attached are possibly affected.
Symptoms of failure
When power is applied there is no visible video output on the monitor.
Solution: Manual override
If you want the video output mode to be PAL:
Pressing the buttons Monitor and 1 on the front panel during power up for about 10 seconds, will cause the DIVAR to go into PAL mode.
If you want the video output mode to be NTSC:
Pressing the buttons Monitor and 2 on the front panel during power up for about 10 seconds, will cause the DIVAR to go into NTSC mode.
By now your recorder should show video on the local monitor again.
The preference forced by manual override is used each time the unit is restarted unless it detects a different video mode on its video inputs. The video mode of the video inputs will become the new preferred mode.
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