M-Audio Hammer 88 Pro, Руководство по обслуживанию

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7. Hit PAD issues
1) Check that the PAD structure is installed correctly.
2) Check whether the connection line and socket between the PAD and the motherboard are normal.
3) Check whether the power and ground are normal on the PAD.
4) Check whether r125/165 is welded normally on the PAD.
5) Check PAD strike signal, otherwise the sensor is damaged.
6) Check whether the U27/33 (4051) circuit is welded normally. If PIN3 has no output, replace 4051.
8. Issues related to the pedal, slider, knob
1) Pedal circuit includes CC PEDAL/SUSTAIN. Check if the sockets and related circuit is properly soldered or
damaged.
2) Slider issues
：
a) Check whether the connection line and socket are connected properly.
b) Check whether the power supply and ground are normal on the small plate where the push rod is
located.
c) Check whether the push rod circuit is welded normally and whether the device is damaged by
virtual welding.
d) Check whether the U5 (4051) circuit is welded normally and PIN3 cannot output signals, then
replace the 4051.
3) Knob issues
：
a) Check whether the connection line and socket are connected properly.
b) Check whether the power supply and ground are normal on the panel where the knob is located.
c) Check whether the knob circuit is welded normally and whether the device is damaged by virtual
welding.
d) Check whether the U46 (4051) circuit is welded normally and PIN3 cannot output signals, then
replace the 4051.
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