TECHNICIAN's CORNER...
Model # HL722 Case History...
PROBLEM...
The Original Power Amplifiers
Burned!

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125,125,125,147,147,147,251,251,251,130,130,130,315,315,315,hl315,hl315,hl315,330,330,330,415,415,415,
hl422,hl422,hl422,520,520,520,600,600,600,700,700,700,710,710,710,715,715,715,716,716,716,720,720,720,722,722,722,
hl722,hl722,hl722,723,723,723,740,740,740,750,750,750,760,760,760,770,770,770,815,815,815,820,820,820,822,822,822,
hl822,hl822,hl822,825,825,825,860,860,860,900,900,900,910,910,910,925,925,925,x77l,x77l,x77l,x77d,x77d,x77d,
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There are numerous contributing factors that can affect the life
& performance of the original
power amplifier circuits. They can begin as
hardly being noticeable yet becoming critical over
a very short
time. Then in an instant without warning a major failure can occur
ultimately
causing the power amplifier(s) to
burn-out and fail like these actual examples. There was indeed
"fire in the hole" and "the
smoke was let out".
Click on the pictures to see these actual
failures up close!
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