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DOWN DBA-200H constant-voltage power amplifier power, panel lights, silent repair
Time£º2015-06-04 08:08:07  Source£ºNetwork  Author£ºUnknown  Clicks£º1167
  

Disassemble, observe the circuit board, power supply fuse is blown. Which fuse is for the power output level power supply, road test negative supply side short circuit to ground. For ease of maintenance related to surveying and mapping the circuit shown in Figure 1.GYkservice manual download site
GYkservice manual download site
The measured individually identified promoting A1930 breakdown, A940 substitution, replacing tests after 8A fuse, still silent. +15V voltage measurement, -15V no voltage, welding patch NE5532,-15V return to normal. SMD JRC4558 substitution is still silent,GYkservice manual download site
Check ¢Ü, ¢Ý feet parallel to ground two SMD diode has a short circuit. Remove the short one, try again is sound.GYkservice manual download site
Turn up the volume, 8A insurance is blown, A940 breakdown by A1941 A1930 substitution and replace the 8A insurance, large volume tests for a long time, everything is normal, and troubleshooting.GYkservice manual download site
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