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
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: | Power Engine 300: | Power Engine 400: |
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| 100V, | 117V units: use F 6A L | 100V, | 117V units: use F 8A | L |
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| 230V, | 240V units: use F 3.15A L | 230V, | 240V units: use F 4A | L |
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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
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.)
7.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.
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