User manual AKAI AT 901

[. . . ] Check that replaced wires do not contact sharp edged or pointed parts. Use care that foreign objects (screws, solder droplets, etc. The LITHIUM BATTERY employed for memory back up has an explosive probability when the battery itself is Normally, LITHIUM BATTERY is not necessary to replace, because the life of LITHIUM BATTERY is about 10 years. iN CASE OF REPLACING: RESOLDER AND SOLDER AS RECOMMENDED WAY. [. . . ] In 0-6 Split mode, arpeggiation af fects the upper split only. 4-2 and 6-0 split modes, arpeggia tion affects the lower split only. gTT OFF FREQ: To Set a cut off frequency oftheVCF(LPF). 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. cO MOD: To produce musically useful timbre shifts. I-PF: To set a cut off frequency of the high pass filter. 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. ATTCK: DECAY: SUSTAIN: Sets the amount of time (T1). Sets the amount of time (T3) after a key is released. 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. and adjust VR7 so that the Digital Voltmeter Read 0 ±2mV. 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. [. . . ] Keep such information carefully under the name of this file. 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. [. . . ]