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Johnson BlueLine 50R Instruction Manual page 3

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POWER SOURCES
This product should only be operated when the power outlet voltage
matches the voltage required by the unit. If you are not sure of the type
of power supply to your outlet, please consult your product dealer or local
power company before operating the unit.
OBJECTS AND LIQUID
Do not insert objects of any kind into this product. It may touch dangerous
voltage points, which could result in fire or electric shock. Keep all liquid
away from the unit at all times.
SERVICING
Do not attempt to service this product yourself by opening or removing
covers. This may expose you to dangerous voltage or other hazards. Refer
all servicing to a qualified service technician.
HEAT
The unit should be set away from heat sources, such as radiators, heat
registers, stoves, or other appliances that produce heat.
CLEANING
Unplug this product from the wall outlet before cleaning. Do not use liquid or
aerosol cleaners. Use a damp cloth for cleaning the outside of the unit. To
clean the inside, take the unit to a qualified service technician.
SAFETY CHECK
Upon completion of any service or repairs of this product, ask the service
technician to perform a safety check to determine that the product is in
proper operating condition.
6
PRECAUTIONS
10
OVERDRIVE CHANNEL — GAIN
This channel adjusts the amount of distortion of the output. NOTE: This will also affect the
volume of the amplifier.
11
OVERDRIVE CHANNEL INDICATOR LIGHT
This LED light glows when the CHANNEL SELECTOR is in the IN position.
12
CHANNEL SELECTOR
To choose the CLEAN or OVERDRIVE channels, the IN position routes the input signal to the
OVERDRIVE channel, whereas the OUT position routes the input signal to the CLEAN channel.
13
CLEAN CHANNEL — BASS, MIDDLE, TREBLE
These three knobs shape the amplifier's tone by adjusting the low, middle, and high frequency
ranges respectively while using the CLEAN CHANNEL.
14
CLEAN CHANNEL — VOLUME
This knob controls the volume level of the CLEAN channel (without overdriving).
15
CLEAN CHANNEL — GAIN
This channel adjusts the pre-amp level. NOTE: Higher levels will achieve a slight overdrive
breakup.
16
CLEAN CHANNEL INDICATOR LIGHT
This LED light glows when the CHANNEL SELECTOR is in the OUT position.
17
HIGH INPUT JACK
Connect the cable from the instrument's output jack to this jack if it has an average
output (i.e., Strat-Style and Les Paul-Style guitars). Always use an undamaged, shielded
instrument cable.
18
LOW INPUT JACK
Connect the cable from the instrument's output jack to this jack. This jack is provided for
instruments that have extremely high outputs (i.e., active pickups) that can result in distortion
when connected to the HIGH INPUT JACK. Always use an undamaged, shielded instrument
cable.
3

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