ATI Technologies L1000 Manuale di funzionamento e manutenzione - Pagina 4

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ADJUSTMENTS

The amplifier has sufficient gain and output capability to overdrive some console

inputs, particularly those providing preamps for high-level input channels. A -1

0dBm line input will provide +8dBm output from the amplifier with the gain pot to

approximately 2 o'clock. 12 o'clock is approximately 0dBm output and 10 o'clock

is -10dBm output (unity gain).

The common mode adjustment pots R1 6 and R35 are factory set to an 80dB null

at 60Hz If disturbed, they can be readjusted by applying a common mode 60Hz

input to HI & LO input together referenced to ground and renulling R16 for CH

1/L and R35 for CH 2/R. The null drops to 40dB at 20kHz due to slightly unequal;

roll offs in the input RF bypass capacitors.

MAINTENANCE NOTES

Power supply voltages are +/- 18VDC nominal, dropping to +/- 16VDC under full

output. If zeners are replaced, remove Al, A2, and A3 ICs and check output

voltage before plugging ICs back into the circuit. Remove power when inserting

or removing ICs.

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

Significant deviation indicates IC or circuit problem. Measurable DC difference

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

MODIFICATIONS - 230 VAC OPERATIONS

Your L1000 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.

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