Ecler HAK320, Руководство по обслуживанию

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Apply the same signal now to the Line2 input terminal, and repeat the steps as listed
above in order to check this input.
While maintaining the user's control knobs at its initial position, adjust the VU-meter's
right channel, until the 0dB indicator led lights up. Now change the switch from its
actual input position to reverse, and adjust the VU-meter's left channel. Verify that no
one of the leds is burned, all of them should light up when needed. Check also the
Peak function. When using the front-end Reverse switches, verify that their
corresponding led lights up at the Hamster section.
Verify that the output signal is only affected now by the Input1 control functions, and
afterwards the Gain control does.
Verify both PHONO inputs, applying a -45dB level input signal. Also verify the RIAA
filter response curves; signal gain at 100Hz and 10KHz should respectively be +12
and -14dB.
Apply an unbalanced -50dB level signal to the MIC input, and adjust the rejection rate
up to better than 70dB at 1KHz. Now apply a balanced input signal and verify the
Level control range, which allows from maximum gain down to signal cut-off. The gain
potentiometer located at the unit's backside allows up to a 20dB adjustment.
Verify the tone control responses, which should be:
• ±
12dB at 100Hz for the low frequencies adjustment.
• ±
11dB at 10KHz for high frequency adjustment.
Verify both XLR-type and Jack connectors.
Check the INSERT input/output.
Apply again the input signal at the Line1 input terminal, and verify output OUT1,while
adjusting its balanced. Also verify the jumper-settings at +6dB, and leave it at 0dB.
Verify the Level potentiometer.
Verify output OUT2. Also have a look at the jumper-settings at +6dB, and leave it at
0dB. Verify the Level potentiometer.
Verify the Mix and Session inputs using their corresponding potentiometers.
While applying a test signal on the Line input, verify the EFF output when its
corresponding pushbutton is pressed, and also check that its corresponding led lights
up. Repeat this process on both inputs.
Verify the headphones output; when the Monitor switch is set to PFL, sliding the
potentiometer will allow us to hear channel one and two; when the switch is set to
PGM, the mixed output signal will be heard. Verify this output's volume and gain
controls.
The correct correspondency between the left and right channels should be revised all
over the unit's different inputs and outputs. Moreover, the unit's frequency response
should be linear from 10Hz to 30KHz (-1dB cut off frequencies), excluding the
channels subjected to RIAA filtering.
Leave the unit connected to the mains and turned on for at least 24 hours.