Toa vm 2120 2240 man en

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2 13. CHOKE COIL INSTALLATION Caution:Leave the following work to a qualified service technician. Be sure to switch off the power before the work. If a checkbox for the indication of "The choke coil is installed." on the rear panel of the VM amplifier is marked with "X", this represents that the choke coil has been installed. Therefore, the following tasks are not necessary. When you installed the choke coil, mark the checkbox with "X". To suppress harmonic component radiation from the power line of the unit, install the optional Chock Coil CT- 200M. Note:In the countries where use of the CE Marking conformity is obligated, the Choke Coil must be installed. Step 1.Remove 4 screws on the amplifier rear panel and a total of 6 screws on the sides to remove the cover. Step 2.Install the Chock Coil near the AC inlet inside the unit. Fix the Choke Coil with its accessory screws from the unit bottom side. Step 3.Remove the jumper connector from the power input board connector (CN1202). Step 4.Plug the Choke Coil connector into the power input board connector (CN1202). Step 5.Using the 4 rear panel screws and 6 side panel screws removed in Step 1, replace the amplifier cover. Side: M4 x 8 machine screw ..... 3 pieces each Rear: M3 x 6 machine screw and M3 plain washer ..... 4 pieces Rear panel Bottom side CT-200M Choke coil Tapping screw 4 x 10 Jumper connector Choke coil connector Power input board AC inlet Rear panelCT-200M Choke coil 3 4

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3 14. INPUT TRANSFORMER INSTALLATION AND ITS BOARD MODIFICATION Caution:Leave the following work to a qualified service technician. Be sure to switch off the power before the work. 14.1. Transformer Installation You can convert the audio input section in Input 1 -“ 3 terminals, Remote Microphone (RM) terminal, and Telephone Paging (TEL) terminal on the unit from electronically-balanced input to transformer-balanced type. Solder the optional IT-450 input transformer to the required input section. Step 1.Remove 4 screws on the amplifier rear panel and a total of 6 screws on the sides to remove the cover. Step 2.Removing the input transformer board [Inputs 1 -“ 3] Remove the Inputs 1 -“ 3 input transformer board, which is installed on the rear upper circuit board in the unit. [Remote Microphone (RM) or Telephone Paging (TEL)] Remove the RM/TEL input transformer board, which is installed on the rear lower circuit board in the unit. Side: M4 x 8 machine screw ..... 3 pieces each Rear: M3 x 6 machine screw and M3 plain washer ..... 4 pieces Inputs 1 -“ 3 input transformer board Rear upper circuit board Rear lower circuit board RM/TEL input transformer board Input transformer