User manual AKAI AT 901

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Manual abstract: user guide AKAI AT 901

Detailed instructions for use are in the User's Guide.

[. . . ] 1) Wires covered with PVC tubing Double insulated wires High voltage leads Insulation Tape Use specified insulating materials for hazardous live parts. Note especially: 2) PVC tubing 3) Spacers (Insulating Barriers) 4) Insulation sheets for transistors 5) Plastic screws for fixing microswitch (especially in turntable) When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc. Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc. Check that replaced wires do not contact sharp edged or pointed parts. [. . . ] LFO SELECT BUTTON and INDICATORS- OCTAVE SELECT BUTTON and INDICA TORS To set the basic octave range of the key board between 2' (highest range) and 32' (lowest range). VCO PARAMETER SET-UP KNOBS PJLSE WIDTH: Acts tike a tone control that changes the timbre of each SEED: waveform. RESONANCE: To boosts the Amplitude of frequencies near the cut off frequency setting. ICY FOLLOW: To change the cut off fre quency according to the key played (higher or lower note) to maintain the same timbre. eG POLARITY SELECT BUTTON and IN DICATORS EG ASSIGNMENT/SELECTION BUTTONS and INDICATORS ARPEGGIO SPEED CONTROL KNOB EG PARAMETER SET-UP KNOBS MASTER LEVEL CONTROL SPUT BALANCE LEVEL CONTROL UNISON MODE SELECT BUTTON and INDICATORS AUTO TUNE BUTTONWHEEL UPPER/LOWER SELECT BUTTON and INDICATORS PINCH BEND DEPTH CONTROL KNOB Sets the amount of pitch change. DEPTH LEVEL: Sets the overall amplitude of the maximum deflection and also the sustain level. 3) Adjust VRI so that the Voltage Value at Pin | land 2) Read the + Voltage Value at the Pin [T|, and connect a Pin GQ are equal or within ± 0. 6-2 VOICE PCB Adjustment Points 1) Set the ENVELOPE GENERATOR to VCA mode and set the EG DEPTH Control to maximum posi tion. 2) Connect a Digital Voltmeter between TP1 and GND 3) Connect a Digital Voltmeter between TP2 and GND and adjust VR8 as same manner as VR7. 4) Adjust VR1 so that the Clipping level at upper side and lower side of the waveform are the same clipping level. 5) Connect an oscilloscope between TP2 and GND , and adjust VR2 as same manner as VR1. 3) Connect an Audio Signal Generator to Pin [I] and||] of connector PI on the CHORUS PC Board, and supply 1 kHz Audio Sine wave signal, and Adjust output level control of Audio Generator, so that the waveform on 6-4. oFF-SET OF IC6 (LF356) ON THE CPU PC BOARD \ VR I /off set □ Fig. 6-5 CPU PCB ADJUST POINT 1) Set to center position of VR1 on the CPU PC Board. FINAL ASSEMBLY BLOCK 17 18 INDEX This Manual is FOR INTERNAL USE ONLY and must not be made available to unauthorized personal. No part of this manual may be re produced in any form without permission from AKAI-ELECTRIC CO. This Parts List lists those parts which are considered necessary for repairs. Other common parts, such as resistors and capacitors, are listed in the "Common List for Service Parts" from which these parts should be selected and stocked. [. . . ] This Manual is TOR INTERNAL USE ONLY and most not be made available to unauthorized personal. No part of this manual may be re produced in any form without permission from AKAI-ELECTRIC CO. MS-0008 DATE: March 1986 The ROM IC program has been changed to improve the following points. Up to 6 times causing request by AUTO MUTE button inoperative for is executed and the data is accepted recorded functions seconds. [. . . ]

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