Safety Instructions

9
3.2. Power Supply
This Power amplifier uses two 3 KVA toroidal transformer. A soft start is provided using relays and resistors
(placed on the switch-ON board). The high voltage is made by combining 8 x 420 V (total 3360V) @ 2.5A
. Each has its own rectifier and filter. In the high voltage circuit, safety resistors are employed to protect
the amplifier against overload (placed on the power supply board).
The separate screen grid supply is regulated and stabilized with MOSFET circuits and delivers abt. 340V
DC at 200mA. Control grid voltage is also stabilized (-130V DC). Change of stabilized first grid voltage is
controlled by the software (EBS for example).
The transformer primary is Tap adjustable for 230 , 240 or 250V AC.
The factory setting is 240 VAC . If the AC voltage in your network is 230 or 250 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.