Tech-21 POWER ENGINE 300 User Manual download pdf (Page 3)

15. This unit must be earth grounded. To reduce the risk of electric shock,

NEVER remove or otherwise attempt to defeat the ground pin of the power

cord. If the provided plug does not fit into your outlet, consult an electrician

for replacement of the obsolete outlet.

WARNING: To avoid the risk of fire, electric shock or injury, do not expose this unit to

rain or moisture. Do not remove the chassis from its cabinet, or remove metal covering

from chassis parts. Removing the chassis from its cabinet exposes extremely dangerous

high voltages. There are no user-serviceable parts inside. Hazardous voltages are pre-

sent inside the chassis. Refer all servicing to qualified personnel.

CAUTION: Never modify the power cord. If original power cord becomes damaged,

frayed, or has exposed wires, replace immediately with same rating and gauge, or high-

er. Replacements are commercially available or you can contact Tech 21 directly.

WARNING: Attempting to repair this unit is not recommended and may void its

warranty. NOTE: In the U.S. and Canada, servicing is performed at factory only. In other

countries, please refer repairs to the local Tech 21 authorized distributor.

FUSE

Fuse holder is located inside A/C cord receptacle. You must unplug and

remove power cord to change fuse.

Replace with similar type and same

value:

PRECAUTIONS

1. Improper wiring may result in serious operating difficulties.

2. Do not short the ground lead of a speaker output cable to the input signal ground.

This may form a ground loop and cause oscillations.

3. NEVER connect the output to a power supply, battery or power main or

electric shock may occur.

4. Tampering with or performing unauthorized circuitry changes may be hazardous and

void warranty.

5. Do not operate if the Clip LED is constantly flashing.

6. Never operate the amplifier with less than the minimum load impedance or prema-

ture clipping and speaker damage may result.

INSTALLATION & MOUNTING

1. During installation, be sure the unit is not connected to a power source, the power

switch is in the “off” position, and Level control(s) is/are at minimum (7 o’clock).

2. If rackmounting, you will need a standard 19” rack case (not included).

3. Rackmounting holes are ISO standard spacing. Four 10-32x.5” philip machine

screws are typically used to secure the amplifier.

4. Considering its weight, we recommend mounting unit on bottom of rack case.

5. If there isn’t enough clearance at the bottom of the rack case, detach the rubber

feet simply by removing the screws.

6. If there’s too much clearance (with or without rubber feet) and you have a gap, pro-

vide additional support to the rear of the unit (such as larger feet, wooden shims, etc.)

DO NOT BLOCK AIR VENTS. Allow a minimum of 4” of airspace at the rear.

STARTING UP

MAIN POWER

• Connect the AC power cord to the Power Engine and to main power

source. NOTE: The 3rd prong of the plug (ground) is an important safety fea-

ture. DO NOT attempt to defeat the ground by using an adapter or removal.

• You will need input wiring cables and output wiring cables (not included) to connect

to your preamp and speaker cabinet(s).

• Be sure all levels in the signal chain, including the Power Engine, are at minimum.

• Turn on the Power switch on the front of the unit, which will glow red.

• Turn up the level of your audio source approx. 3/4.

• Gradually turn up the Level control(s) on the Power Engine to approx. 3/4.

• Adjust the level of our audio source accordingly to normal amount.

FRONT PANEL

LEVEL(s)

Adjusts the overall volume. We recommend starting with Level(s) approx. 3/4 up and

then adjusting to desired amount.

SIGNAL LED

Green status indicator for presence of an input signal. It will flash when the signal

passes to your speakers.

CLIP LED

Red status indicator for presence of input clipping distortion. It will flash when at maxi-

mum output. Lower bass frequencies may cause occasional flashing, for which there is

no need for concern. Higher frequencies causing consistent flashing, indicates there is

excessive distortion, which could result in damage to high frequency drivers, but not

the amp itself.

NOTE: If the Clip light(s) remain on when there is no signal, it may

indicate there’s a problem. Contact Tech 21 for technical assistance to determine how

to proceed.

Power Engine 300:

100V, 117V units: use F 6A L

230V, 240V units: use F 3.15A L

Power Engine 400:

100V, 117V units: use F 8A L

230V, 240V units: use F 4A L

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Tech-21 POWER ENGINE 300 User Manual Page 3

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