CAUTION IN HANDLING
Read this manual carefully before using the amplifier.
1. Do not apply neither voltage nor current to the output terminal of this amplifier from external
source.
2. Use this amplifier with power supply voltages from 85 VAC to 132 VAC, 180 VAC to 264 VAC, or
10 VDC to 30 VDC. The AC power supply selection switch is provided inside the chassis. To switch
the AC power supply voltage, refer to Page 7-4. If the power fuse is burnt, check the cause of fuse
blow-out. To replace the fuse, always disconnect the power plug and input/output signal cable first,
and then replace the fuse in the fuse holder. For how to replace fuse, see Page 7-3. When
replacing, examine the ratings of fuse (e.g. for AC or DC).
3. The operating temperature and humidity of the amplifiers is –10 to 50C and 20 to 85%,
respectively. If opening the package in a warm room during the cold season, open the package
after it has reached room temperature to avoid any operational failure due to condensation on
the surface of the product.
Do not use this instrument at the following locations.
- High-humidity locations
- Locations with direct sunlight exposure
- In the vicinity of high-temperature heat source
- Location with vibrations
- Locations where salt, water, oil, or corrosive gases exist
4. When using many amplifier units, install fan units.
5. When a case is used to accommodate amplifiers, the case must be grounded.
6. This product uses a flash memory for saving setup values. Replacement of battery is not needed
accordingly.
7. This amplifier unit uses rotary encoders are used for knobs to control functions. However,
indication position of the knob sometimes stays at the position between scale markings. In such
case, the settings upon power-up may differ from those upon turning off the amplifier. To avoid
such event, it is recommended to allow knob indication to be at the correct scale marking position.
