ATI Technologies M1000 Руководство по эксплуатации и техническому обслуживанию - Страница 5

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IC output DC voltages (no signal conditions) should measure 0 VDC +/- .5 VDC.

Significant deviation indicates IC or circuit problem. Measurable DC difference

between +/- amplifier inputs (other than due to meter loading) indicates IC failure.

Five to ten years hence, replace aluminum electrolytics in power supply.

Keep 250 W soldering guns out of the MicroAmp.

If hit by lightning, replace Al through A3.

MODIFICATIONS

230 VAC OPERATION

Your amp is wired for 115 VAC 50/60 Hz operations unless otherwise requested

at the time of ordering. It can be modified for 230 VAC use by removing the

Power transformer primary jumpers W1 and W3 and inserting a jumper in the W2

holes.

150-OHM OUTPUT IMPEDANCE

Transformer output M1000s are converted to drive 150 ohm audio lines by

removing jumpers W4 and W5 located adjacent to output transformers T3 and T2

respectively. Insert two new jumpers for each output transformer between the

original jumper terminals and the empty terminals immediately adjacent to and in

line with the original terminals in order to parallel the secondary windings.

Balanced differential output and single ended output will drive 150 ohm loads

without modification but will current limit before full supply swing is reached.

INPUT CENTER TAP

The center taps of the input transformer primary are available on the PC board

next to the transformers and are labeled CT. They may be grounded by adding

jumpers between each CT point and the adjacent empty holes.

INCREASED GAIN

Additional gain can be provided for low output boom mikes by raising feedback

resistors R21 and R40 (M1000-1, -3) from 220K to 680K ohms (10 dB increase).

The M1000-2 requires that R21 and R40 be increased to 330 K ohms and also

R45 and R49 be increased to 820 K ohms for a 10 dB gain increase.

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