TOA Electronics VM-2120 用户手册

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Step 3. Solder the input transformer to the removed input transformer board (5 places). 

Note: Be sure not to mistake the solder side for the mounting side. 

Step 4. Cut off jumper wires (2 places marked with X for each input). 

Note: The jumpers are on the back of the circuit board in the figure below. 

[Inputs 1 – 3 input transformer board] 

[RM/TEL input transformer board] 

Step 5. Replace the input transformer board on the circuit board. 

Step 6. Using the 4 rear panel screws and 6 side panel screws removed in Step 1, replace the amplifier

cover. 

By cutting the following jumper wires on the Inputs 1 – 3 Input Transformer Board, the corresponding input's
phantom power can be switched off. (See the figure above.)

Input 1: SJP1301
Input 2: SJP1304
Input 3: SJP1307

• Be sure to cut the jumper wires SJP1401, SJP1402, and SJP1403 on the RM/TEL input transformer board in

the sub-VM amplifier. 

• To make the Remote Microphone (RM) input transformer-isolated, be sure to install the input transformer on

the RM/TEL input transformer board in the master VM amplifier. In addition, cut the jumper wires SJP1402
and SJP1403 while remaining SJP1401 intact. 

INPUT 1

INPUT 2

INPUT 3

(SJP1303)

(SJP1301)

(SJP1302)

(SJP1306)

(SJP1305)

(SJP1304)

(SJP1307)

(SJP1308)

(SJP1309)

Jumpers for Input 1

Jumpers for Input 2

Jumper for Input 1 
phantom power supply

Jumper for Input 3 
phantom power supply

Jumper for Input 2 
phantom power supply

Jumpers for Input 3

RM

TEL

(SJP1402)

(SJP1401)

(SJP1403)

(SJP1404)

(SJP1405)

Jumpers for RM

Jumper for DC power supply to the RM

Jumpers for TEL