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If you have the standard RL-H3C then there are 3 buttons. Starting from the left there is the "height alert" then "manual" then "Power".
Height alert is a function that after the laser levels and spins monitors the position of the laser. If the laser moves more then a tiny amount then the height alert function is tripped, and the laser flashes it's lights and stops spinning (or spins slowly) to let you know the base line position of the laser has changed. Pressing the height alert button twice shuts this mode off.
Manual mode means after the laser is leveled, it completely ignores the level vials. You can turn the laser any way you want to and it will always spin and not cause any errors.
Power is self explanatory.
If it's a RL-H3CS then it has two arrow buttons, that when in manual mode, allot one axis of the laser to be manually adjusted up and down to do a manual slope.
There are detailed instructions in your users manual on how to check and adjust your Topcon laser. You'll need a tripod, 2 vertical surfaces about 50 meters apart and your laser receiver. It's done by marking positions of the beams, on the different surfaces and then adjusting your laser position to the center of the different positions.
The procedure is different for different models, but i have attached some pictures from the manual for the RL-VH4 series.
Do you have the subwoofer amp connected to the pioneer thru pre amp connections; pre amp output of pioneer to pre amp input of Kicker amp. Page 10 of the manual explains how to adjust the subwoofer output. You can select the cutoff freq. that will pass to the subwoofer; The slopes don't match perfectly, but if you use the -12 slope , it should work fine.
80HZ same as kicker cut in freq
Put the instrument on a tripod, and line up the gun sights on top of the laser, in the direction you want the slope to be. figure out which axis your in (based on the filled in or empty wedge on the side of the laser above the glass) and then press the up or down arrow for the corresponding display screen on the keypad. Hold up or down until you've reached the percent grade you want.
Likely it's dirty battery contacts. Clean the contacts on the battery tray, and the coil springs in the laser, and it should start.
If not open the laser, reinsert the battery tray with good batteries and test the voltage at the battery connector at the rear of the laser.
Check for signs of water damage or corrosion.
short out the power switch, to make sure it's not the problem.
The switch circuit board, power connectors, battery tray, and motors are the only electronic parts still available for these lasers, and that is only because they share them with the RL-H3A, which was only discontinued in 2011. If none of the above will make it turn on, you'd need to find used parts, and try and rebuild it.
I think you should look into the possibility that your rear brake pads, and your parking brake pads are different items. Replacing one is not necessarily replacing the other. Many vehicles have different brake surfaces, and adjustments thereto, for parking brakes. Find the person who did the back brakes and ask him if there is another set of pads for the parking, and if so, did he replace those too? If they do not know, call a dealer parts department or a plain jane car parts store. I notice advance parts seems to indicate a parking brake shoe set for your car, in addition to the back brakes, but they do not sell them.