Zoom g9.2tt - Pre Emphasis Check; De Emphasis Check; Reverb (SW) Check; Input Circuit Noise Check

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19. INPUT CIRCUIT NOISE check
Push [PRE-AMP] FOOT SW (SW23)
[PRE-AMP] key lights red.
LCD displays [GAIN +60].
About this check, adjust [TUBE] of ACCELERATOR, [SOLID STATE] of ACCELERATOR,
[TUBE] of ENERGIZER, and [BOOST] of ENERGIZER to 5.
Make sure that noise level increases.
When 7 segment LED displays [on], DSP has +60dB gain and increase white noise of [OUTPUT]
jack (PHONE, L/MONO, R jack) and [SEND] jack sound.
By pushing key repeatedly, 7 segment displays [on], [oF] alternately, and at the same time DSP
gain will be on/off.
20. PRE EMPHASIS check
Push [MOD/EFX2] FOOT SW (SW25)
[MOD/EFX2] key lights red.
LCD displays [PRE EMPHASIS].
By pushing key repeatedly, 7 segment displays [on], [oF] alternately.
* When 7 segment displays [on], PRE-EMPHASIS is on by DSP
21. DE EMPHASIS check
Push [DELAY] FOOT SW (SW27).
[DELAY] key lights red.
LCD displays [DE EMPHASIS].
By pushing key repeatedly, 7segment displays [on], [oF] alternately.
* When 7 segment displays [on], DE-EMPHASIS is on by DSP
22. REVERB (SW) check
Press the [REVERB] FOOT SW (SW 629).
Make sure that the [REVERB] LED lights red, and LCD is displayed [TUBE ACCELARATOR].
By pushing key repeatedly, 7segment displays [on], [oF] alternately.
*The output sound doesn’t change by this operation.
*Make sure that there is no defect on the sound (abnormal noise .etc)