LEM Hurricane H200A User Manual

1
Index
Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
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Technical data2
Passive versions3
Checking & adjustement
9
10 H350A schematics
11
H300A, H300MA schematics
12 Spare part list
H350SA, H400SA schematics
4
H100MA, H150A, H200A, H200MA schematics8
with the same signal name inscribed.
ATTENTION Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only. Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (μ) micro symbol of capacitance value is substituted by U.
The (
Ω) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8W unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
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service manual
schematic diagrams
CODE: 270306 version 1.02
Powered & passive loudspeaker systems
hurricane

LEM Hurricane H200A Specifications

General

Power Handling	200W
Impedance	8 Ohms
Frequency Response	20kHz
Outputs	XLR (Link)
Enclosure Type	Bass Reflex

Summary

General Precaution

Visual Check

Inspect speakers for damage and internal assembly integrity.

Test Instruments

List of required test equipment for service procedures.

H100MA Checking & Adjustments

Setup

Verify insulation/PTC, connect Variac and audio generator.

Supply Check

Check AC and DC supply voltages on the supply board.

Channel Check

Test voltage and current amplifier stages for distortions.

Limiter Check

Verify output voltage and wave shape stability with increased input.

Bias Adjustment

Adjust VR1 trimmer for specific DC voltage across resistors.

Bandwidth Check

Test frequency response by varying generator frequency.

Offset Sensor Check

Verify protection circuitry detects DC voltage and opens relay.

Signal to Noise Ratio Check

Measure output signal noise with input shorted.

H300A H300MA Checking & Adjustments

Low Frequency Channel Check

Test low frequency channel amplification.

High Frequency Channel Check

Test high frequency channel amplification.

H350SA H400SA Checking & Adjustments

Load Current Test

Connect 4 Ohm 500W load and repeat tests.

Sign/Comp Sensor Check

Check SIGNAL/COMP LED activity with signal level increase.