Service and Maintenance Instructions
The following procedures are designed to assist in the
isolation of malfunctions. The operations described
should be undertaken only after an investigation of all
external connections and adjustments has indicated,
beyond reasonable doubt, that the problem is actually
within the amplifier.
WARNING:
Disconnect the amplifier from the power
source before performing service operations or
replacing components.
Voltage Conversion
Either amplifier can be operated from either a 120 V AC
or 240 V AC, 50/60 Hz source. The line voltage selector
terminal strip, TB401, Figure 3, changes the primary
connections of the power transformer. Use the follow-
ing procedure to change the voltage range:
1. Remove the 10 screws which hold the top cover
to the chassis.
2. To convert from 120 V A C to 240 VAC, remove the
two terminal strip jumpers, Figure 4a. Install one
jumper only per Figure 4b.
3. Change the line cord and/or attachment plug to
match the supply source receptacle, or use a 120 V
to 240 V A C adapter (not provided).The adapter
as well as the power supply cord and/or attachment
plug used for the 240 VAC mode in the U.S.,
Canada and Japan shall be both UL Listed and
CSA Certified for use with said power source
receptacle and wired per Table 4. For use in other
countries, adapter, line cord and/or attachment
plug selection shall be based on local regulations
governing 240 V A C , 50/60 Hz supply sources.
4. Change the line fuse from a 3A, 3AG type to a
1.5A, 3AB.
WARNING
THIS SECTION OF THE M A N U A L
CONTAINS SERVICE INSTRUCTIONS
FOR USE BY QUALIFIED SERVICE
PERSONNEL ONLY.
FIGURE 4A
120 V A C
FIGURE 4B
240 V A C
FIGURE 3
TB401
TABLE 4
Line Cord Connections
Terminal Strip
Fuse Holder
Ground
Lug
Country
Wire Color Code
(TB401)
(Center Terminal)
(Figure 3)
U.S., Canada and Japan
Black
—
Attached
—
White
Attached
-
-
Green
-
-
Attached
Europe
Blue
Attached
—
Brown
Attached
Green/Yellow
-
Attached
120
240
120
120
240
120
