6.2 Solutions for the main board common problems
：
6.1.1 Please check if the lock screws of the AC IN (3P terminal)
power input cable is loose? If yes, please refixed them .
6.1.2 If 5P cable of the Key board does not connect well , it would
cause the indocator light and the buttons out of working, It
seems like no power. Please connect it again.
6.1.3 The checking solutions mentioned above, you can process
it without the case open ,but it must check by a multimeter if
there are around 3.4K resistance value at L and N terminals
of the power input socket. If yes, then the AC current loop is
normal (including transformers, fuses).
6.1.4 If the main board don’t show 12V ,it means it is abnormal,
please check if RL1 is damage.
6.1.5 If the main board don’t show 5V ,it means it is abnormal,
please check if L7805 is damage.
6.1.6 If the main board don’t show 3.3V ,it means it is abnormal,
please check if 7533 is damage.
6.1.7 Up -limited switch is the pulse level control, after the pulse
finished, it still keeps in stop. But the display power is
required to maintain the shading by the photoelectric
control.
6.1.8 Down- limited switch is the low pause control, it will
continue to decline under the high ,so when the decline is
finished, the photoelectric control should be under the
light-shading state.
Summary of Contents for WR-15CL
Page 10: ...6 3 Circuit schematic diagram...
