ZMODO ZMD-DT-SCN4 - Manual (Page 69)

H.264 Super Digital Video Recorder User Manual
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2、 The DVR reboots automatically or stops working after boot up a few minutes.
Possible reasons are as followed:
1 The input voltage is not stable or too low.
2 The hard disk is damaged or the hard disk lines are broken.
3 The power of the switch power supply is low.
4 Frontal video signal is not stable.
5 Bad heat radiator or too much dust or bad running circumstance for the DVR.
6 The hardware of the DVR is damaged.
3、 System can not detect hard disk.
Possible reasons are as followed:
1 The hard disk power supply line is not connected.
2 The cables of the hard disk are damaged.
3 The hard disk is damaged.
The SATA port of main board is damaged.
4、 There are no video outputs in single channel, multiple channels and all channels.
Possible reasons are as followed:
1 The program is not matched. Please update the program.
2 The image brightness is all 0. Please resume the default setup.
3 There is no video input signal or the signal is too weak.
4 The channel protection or the screen protection is set.
5 The hardware of the DVR is damaged.
5、 Real-time image problems such as the image color or the brightness distortion.
Possible reasons are as followed:
1 When using the BNC output, the option between the N mode or PAL mode is wrong and
the image becomes black and white.
2 The DVR is not matched the monitor impedance.
3 The video transmission distance is too far or the loss of the video transmission line is too
large.
4 The color and brightness setting of the DVR is wrong.
6、 I can not find the video files in local playback mode.
Possible reasons are as followed:
1 The data line of the hard disk is damaged.
2 The hard disk is damaged.
3 Update the different program with the origin program files.
4 The video files to search are covered, or search time is wrong, please refer to the device