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LGB LMB-889-amplifier machine, boot, relay not closing
Time£º2015-05-26 08:11:00  Source£ºNetwork  Author£ºUnknown  Clicks£º1162
  

Open the Cabinet and observe fuse found faults that were burnt black, and have serious short circuit description the circuit. Using fuzzy method directly to the power amplifier mounted on a heatsink to inspect the pipe, found two PNP-type power amplifier tube (2SA1301) total breakdown, NPN-type power amplifier tube (2SC3280) is good.A3Cservice manual download site
A3Cservice manual download site
Removed all power tube, an 8 a fuse and replace the boot, relay normally absorbs, VBE of the two channel amplifier output voltage measurement (equivalent to the voltage figure 2 g, f), completely normal.A3Cservice manual download site
A3Cservice manual download site
Driver output voltage measurement (equivalent to voltage between c and d in Figure 2), is also normal, other circuits no "fault". Installing the power amplifier for NPN-type tube and damage of the PNP-type power amplifier tube new, "failed" excluded.A3Cservice manual download site
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