TOA Electronics VM-2120 Manuale Utente
44
20. CHANGING THE SPEAKER LINE VOLTAGE
Caution: Leave the following work to a qualified service technician.
Be sure to switch off the power 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.
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).
(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.
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/impedance
How to remove cables from connector
Pull out the cable pressing the lock spring with a pointed object like tweezers as shown below.
VM amplifier's front panel
CN1102 connector
Pull out the cable.
Press the lock spring.
1
9
Speaker line voltage
CN1102 Connector Pin Number
1
2
3
4
5
6
7
8
9
100 V
White
Violet
Blue
Green
Yellow Orange
Red
Brown
Black
70 V
Violet
Blue
Green
Yellow Orange
Red
Brown
White
Black
50 V
Blue
Green
Yellow Orange
Red
Brown
White
Violet
Black
Speaker line voltage VM-2120 VM-2240
100 V
83 Ω
42 Ω
70 V
42 Ω
21 Ω
50 V
21 Ω
10 Ω