A DS-1550A constant-voltage power amplifier, just installed a few days to burn out. View found AC 220V input line fuse 8A has blasted the blackened.H4iservice manual download site
H4iservice manual download site
Remove AC input line fuse, in the measurement of large aluminum heat sink top 5 power output tubes A1943 c-e the resistance of 0 ω. 5 pipes parallel, specifically a breakdown is much breakdown is not important. Amplifier for ease of maintenance surveying and mapping level diagram as shown in Figure 1.H4iservice manual download site
H4iservice manual download site
Toroidal power transformer secondary main winding outputs B1 130V AC voltage into the KBPC3510 aluminum bridge rectifier (current: 35A, voltage rectifier bridge 1000V), rectified the pulsating DC voltage after charging and discharging smoothed by C1-C4, in the anode and cathode connection point for C3 C2 form suspended m, resulting in VCC+90V and VCC-90V for use by the power output section. C1, C2, and C3, C4 series later as two 2350 μ F/126V high voltage electrolytic capacitors,H4iservice manual download site
H4iservice manual download site
Can reduce costs, can also improve the long-term reliability of work. The four capacitors to filter regulator is also the effect of amplifier amplifier module amplified audio signal communication pathways, their capacity through the lower limit of the low-frequency audio signal has no effect, the whole pass band width decision totally on your audio output transformer performance of B2.H4iservice manual download site
The audio input signal is half a week, access roads for cathode → VCC+90V → v+ into the power amplifier module C1 B2 GND output added to the audio output transformer primary winding left right → m → j → C2 speaker protection relay of the cathode, completing a half-cycle of circulation;H4iservice manual download site
H4iservice manual download site
When the negative half cycle of the audio input signal, pathway C3 positive floating speaker protection relay m → j → B2 audio output transformer primary winding on the right side. Left end → → GND power amplifier modules → V-→ C4 cathode VCC-90V. R1, R2 is 4.7k/5W specifications of cement resistor, C1, C2, and C3, C4, pressure resistance, and C1-C4 leak of the remaining charge after shutdown.

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