Real-draw the power amplifier circuit diagram is shown in Figure 1. Because amp short circuit damage, voltage amplification possibilities of damage is very small, so the point level check up from behind. A, b two-channel push tube, power tube welding are measured, no damage.6rxservice manual download site
6rxservice manual download site
Power up the system, measuring a voltage between two points a and b channels of 0V, normally should be 2.2V, D1, D2, D3 and D4 all logging penetrates, D1, D2 1N4148 substitution available model 1SS252, D3, D4-HZS4BLL 12V voltage regulator tube replacement available; measured R2, R2 circuit breakers, with 1/4W made of gold film resistors substitution; log V5 is not damaged.6rxservice manual download site
6rxservice manual download site
Power on, power on measuring forward voltage of a normal (denoted by the value in the figure broadly in line), the voltage between two points a and b should be 2.2V (if not, please recheck the fore elements), the voltage should be at about 45V (without negative feedback). Similarly, the b-channel check replacement is complete.6rxservice manual download site
6rxservice manual download site
A, b-ch fitted push tube (A940, C2073 substitution), power management (A1302 and C3281), in the power tube collector series plus a 5 Ohm resistance/2W protection (to prevent accidental damage to power tube, cannot ignore this step),6rxservice manual download site
Power measurement of two-channel voltage normal, every element does not have a fever, shutdown, remove protective resistor.6rxservice manual download site
Another native protection circuit can also be burned, because of its more common circuit may refer to other protection circuit repair and will not repeat them here.6rxservice manual download site