Changing The Speaker Line Voltage - Toa VM-2120 Instructions D'installation

20. CHANGING THE SPEAKER LINE VOLTAGE

Caution: Leave the following work to a qualified service technician.
Be sure to unplug the AC power cord before the work.
The VM amplifier's speaker line voltage is set for 100 V line output. For 50 V or 70 V line applications, change
internal connector wiring as shown below.
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. Pull the cable connector (9-pin) connected to CN1102
connector on the circuit board with the zone volume control
(selector switch).
Step 3. Change wires inserted into the cable connector for different
wires according to color-coding shown in the table below to
switch to the desired line voltage.
Step 4. Connect the cable connector to the circuit board.
Step 5. Using the 4 rear panel screws and 6 side panel screws
removed in Step 1, replace the amplifier cover.
Connector pin assignment
Speaker line voltage
100 V
70 V
50 V
Speaker line voltage/impedance
Speaker line voltage VM-2120 VM-2240
100 V
70 V
50 V
How to remove cables from connector
Pull out the cable pressing the lock spring with a pointed object like tweezers as shown below.
1 2 3
White Violet Blue
Violet Blue Green
Blue Green Yellow
83 Ω 42 Ω
42 Ω 21 Ω
21 Ω 10 Ω
Pull out the cable.
1
CN1102 Connector Pin Number
4 5
Green Yellow Orange
Yellow Orange
Orange Red Brown
Press the lock spring.
9
CN1102 connector
VM amplifier's front panel
6 7 8
Red Brown
Red Brown White
White Violet
9
Black
Black
Black
9