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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.
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/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
123456789
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