Observe the Dianyuan amplifier module power indicator is not lit, the output power is small, a power amplifier tube current is not normal.WZFservice manual download site
WZFservice manual download site
Maintenance: the high costs of power amplifier is a transmitter section. "Failed" as many places. Amp self protection in the former group had incentives to protect. Protection when the first power reduction; middle level is over temperature protection, protection is also reducing power, but are likely to resume; last stage for overload protection, protection is unlikely to recover, and only unplug the amplifier module.WZFservice manual download site
WZFservice manual download site
Solution: test PA quiescent current. Power transistor 1~5 can be measured directly. Power tube 6 current measurement needs to press the Microswitch of the back panel of the amplifier, Vg only front panel indicator lights, can only undertake current measurements.WZFservice manual download site
WZFservice manual download site
1. the amplifier overloads, you should check the amplifier synthesizer and reliable welding between from the RF output: amplifier used in detection of reflected power detection circuit for damage devices between synthesizers and amplifier RF cable for signs of damage. 2. a power amplifier output power decreases. Cause actuator power output increased amplifier when overdrive protection arise, such as amp gate voltage indicator is not lit, adjust the amplifier switches positions. Exclude this phenomenon; amp gate voltage is zero, then touch the Microswitch Reed, there should be clear elasticity, otherwise replace; power amplifier tube, then check the MCU amplifier tubes work, to replace the damaged power tubes. 3. Amplifier overheating, you should check the operation of the fan and air duct; amplifier overheating relay parameters amplifier synthesizer in transmission and reflection of the population; outside is too much dust on the surface of the heatsink.WZFservice manual download site