9
safety resistors and fuse are employed to protect the amplifier against overload (placed on the power
supply board and around PI-L circuit).
The separate screen grid supply is regulated and stabilized with MOSFET circuits and delivers abt. 350V
DC at 120mA. Control grid voltage is also stabilized (-120V DC). Change of stabilized first grid voltage is
controlled by the software (EBS for example).
The transformer primary is Tap adjustable for 220, 230 or 240V AC.
The factory setting is 230 V AC.
If the AC voltage in your network is 220 or 240 Volts, you need to set the correct transformer tap
before first starting the PA. See part 7.1. for more information. Other primary voltage is possible on
request (for example 200V 50/60 Hz for Japan).
3.3.
Safety Devices
Control and monitoring circuits ensure control and safety during malfunctions of the PA. These are placed
on the Control board, which is located on the chassis subpanel.
One of the important safety elements is a
mechanical switch for AC blocking an opened
amplifier.
4.
INSTALLATION
Read this chapter carefully prior to starting installation. Before unpacking inspect shipping
carton for any damage. Keep all of packing parts for possible future shipment. Check unpacked
power amplifier. If you find any damage, contact your dealer immediately to keep full
warranty.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
