ATI Audio DA1000 Betriebs- und Wartungshandbuch - Seite 5
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Audio inputs and outputs should be connected using the rear panel labels as a guide. HI
outputs are all in phase with each other and in phase with the HI inputs. Fanning strips
are provided so that our ears won't be burning in the middle of the night while you are
trying to wrap wires around tiny barrier strip screws. The fanning strips are Kulka part
number 649A22 and extras are available from our Parts and Accessories Department.
To allow maximum flexibility in grounding in high RF environments, the circuit grounds
are isolated from case ground. For normal operation, add a ground jumper from the
barrier strip ground terminal closest to the inputs to the chassis ground screw.
CAUTION
The balanced differential outputs have active drivers for both HI and LO output
terminals. DO NOT GROUND either HI or LO terminals. To drive an unbalanced
(one side grounded) load, connect it between HI and GND terminals and let the LO
terminal float. Two separate 600 ohm unbalanced loads can be driven from each output
without interaction by connecting one between HI and GND and the other between LO
and GND. The two loads thus driven will be out of phase with each other.
MAINTENANCE NOTES
Power supply voltages are + and - 20 VDC nominal. Maximum allowable voltages are
±22 VDC (limited by IC). If zeners are replaced, remove 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 0VDC ± .5 VDC.
Significant deviation indicates an IC or circuit problem. Measurable DC difference
between HI and LO amplifier inputs (other than due to meter loading) indicates IC
failure.
If hit by lightning, replace Al through A3.
MODIFICATIONS
230 VAC OPERATION
Your DA1000 is wired for 115 VAC 50/60 Hz operation unless otherwise requested at
the time of ordering. It can be modified for 230 VAC use by removing the power
transformer primary jumpers J1 and J3 and inserting a jumper in the J2 holes.
GAIN
To increase gain by 10dB, change R13 to 680 ohms and increase C15 to 68 µF.
ATI Audio Inc.
■ Tel: 856-626-3480
■
Fax: 856-504-0220
■
www.
audio.com