Laserpic scanner failure
Background:
Today…I was doing a final alignment adjustment of the scanner head on my projector. This adjustment required a slight movement of the entire scanner head to achieve best placement for the incoming RGB beam. The scanner power supply was off. The scanner head was unbolted and removed and the position hole was enlarged to allow for better alignment of beam to X/Y Galvo mirrors. All went well. The scanners are Laserpic LP 30’s.
Prior to this point in time…when the Scanner PS was powered up…the galvos would center their orientation….and the RGB beam would project very close to a 90 degree from both the X and Y galvo axis. When the scanner power was turned off…the galvos would go to a “ default position” …not at the 90 degree…..but always the same position. When the scanner was on… BOTH red LEDS on the scanner amplifier boards would illuminated…solid red( NO FLASH )…and the green LED on the 24VDC power supply would also light up solid (NO FLASH )
Problem:
After the re-alignment was complete…I went to power up the scanner PS…Now……the Y-Galvo was NOT stationary….as it had operated before….now it has a chatter/movement….about every one (1) second….the Y-Galvo rotates…about 30 degree….up and down….and just keeps this movement up….shifting about every second. And now…The red LED flash on BOTH scanner amplifier boards…their flash rate is in sync with the Y-galvo movement and the green LED on the PS also strobes in sync with the red LED’s. Oh….I observed NO magic smoke puff when the scanner was powered back up !!!!
Trouble shooting:
I tried to determine if my problem was with the Y-galvo. To this end…I exchanged X/Y galvo hook-up to the scanner amplifier. This had NO effect. Either galvo has the same unsolicited movement when connected to the Y scanner amplifier board. Another notable fact…when I disconnect the galvo from the Y amplifier board…..the red LED indicator lights go back to solid red illumination and the green PS also is on solid. As of this time….I would say there is a problem with my Y amplifier board…..What caused it and why did it happen when I moved the scanner head ????? ….Dunno ???. ALL Aluminum drill chips were contained and collected with great care !!! I likely did something wrong ???? Was the projector grounded when the drilling operation was going on ???? mmmmm…..I THINK it was ?????
This unit is long out of any type of warranty !! Can it be repaired ??? Maybe !!! Is there anything or connection I should check ??? Ground to the PS is good… It is a real pisser when I just now have started “ swinging the beam”…… and the “ swinger takes a crap” !!!!....Or…..Should I just use this as an excuse to pop for a new DT-40W ( That’s what TerraWatt sez…..and she is almost ALWAYS right !!!!!!! )….and to that end…..what does everyone think about DT scanners ??????? THANX !!!! Bob.....OH...I have emailed Laserpic....No response yet....
Last edited by CDBEAM; 01-03-2010 at 05:02.
Reason: typo
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