TOA Electronics VM-2120 Switching Off the Phantom Power Supply, RM/TEL input transformer board

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]

Jumpers for Input 1 Jumpers for Input 2 Jumpers for Input 3

(SJP1303)

(SJP1301)

(SJP1302)

INPUT 1

INPUT 2

(SJP1305)

(SJP1306)

(SJP1304) INPUT 3

(SJP1307)

(SJP1308)

(SJP1309)

	Jumper for Input 2
Jumper for Input 1	phantom power supply
	Jumper for Input 3
phantom power supply	phantom power supply

[RM/TEL input transformer board]

(SJP1402)

Jumpers for RM

(SJP1401)

(SJP1403)

RM

TEL

(SJP1404)

Jumpers for TEL

(SJP1405)

Jumper for DC power supply to the RM

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.

14.2. Switching Off the Phantom Power Supply

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

14.3. Instructions When the Sub- and Master VM Amplifiers Are Connected

•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.

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