I'm going to quote myself here...
http://bbs.stardestroyer.net/viewtopic. ... ht=burning
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Also, there is some evidence that Owen Lars and Beru were subjected to interrogation by the stormtrooper squad. One blood-stained skeleton was prone a foot or so next to the stair down to the farmhouse, the other draped backwards over some low crates or the like. Neither was close enough to the stairs that they could have staggered out of the blazing inferno of the farmhouse and then scenically draped themselves; legs with the muscles burned off don't work. Further here is a possibly illuminating quote:
Han Solo at Star's End , by Brian Daley, 1979 (Daley also wrote the old Star Wars radioplay)
"...You Know what I refer to, Solo-Captain?"
Han did. The Burning was a torture involving the use of a blaster set at low power, to scorch and sear the flesh off a prisoner, leaving only blood-smeared bone. Usually, a leg would be first, immobilizing the vicitim; then the rest of the skeleton was exposed, inch by inch. Any other prisoners could be made to watch, to break their will. The Burning seldom failed to obtain answers, if answers were to be hand; but in Han's opinion, no being who employed such methods deserved to live.
Also, in the novel Lando Calrissian and the Starcave of Thonboka, L. Neil Smith, 1983, one of the characters, Klyn Shanga, uses his blaster pistol set at one-hundredth power to light a cigar. Of course, Shanga is from a technologically backward area that was rather brutally assimilated by the Empire, and so his blaster may not be quite up to spec in terms of its maximum output.
There are also references to variable power levels and focus of blasters in the above-mentioned Han Solo novel and its sequels. In Han Solo and the Lost Legacy, from 1980, Han and company are embroiled in a desperate fight with the ancient, armored war robots of Xim the Despot.
Han threw aside the useless assault rifle and drew his blaster, setting it for maximum power. Chewbacca stepped back, removing the magazine from his weapon and taking one of the larger ones from his bandoleer. Han stepped in front to cover him in a stiff-armed firing stance. He squeezed off bolt after bolt, deliberately and with great concentration, into the approaching robot's cranial turret. Four blaster rounds stopped the machine just as it fired in response. Han ducked the heatbeam that split the air where he had stood. As the robot fell, the beam traced a quick arc upward.
[Note: the robots are of pre-Repblic make, heavily armored enough that it takes two men to lift a disconnected head, and about half again as tall as a Trade Federation super battle droid.]
Later in the battle, the gunman Gallandro temporarily saves Han's bacon by shooting one of the robots. Gallandro is using a custom quick-draw blaster pistol similar to Han's:
The war-robot seemed to block out the sky, a machine out of a nightmare. But abruptly its cranial turret flew apart in a blast of charred circuitry and ruptured power routing as a thread-thin, precisely aimed beam found its most vulnerable point. Han scarcely had the presence of mind to take a step back, nearly treading on Chewbacca, as the automaton crashed at his feet like an old tree.
Han commenting on the shot:
"It was him, Gallandro," Han told his partner, "A fifty-, maybe sixty-meter tight-beam shot." The Wookie shook his head in bewilderment, mane flying.
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In Han Solo at Stars' End, one of Han's compatriots sets a large disruptor pistol to deliberate overload, ruining the pistol, blistering the man's hands, and ruining the front of a CSA Espo troop hovervan. In Han Solo and The Lost Legacy, a shot from a compact disruptor pistol, sends the torso and limbs of one of Xim's war robots in a wild scatter, analogous to the effect of regular blaster bolts on TradeFed battle droids in The Phantom Menace.