Alesis Microverb User Manual

Confidential Alesis Service Manual 8-31-0160-A
ALESIS
MicroVerb/
Microverb II
(C1/C2)
Service Manual
P/N: 8-31-0160-A
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Alesis Microverb Specifications

General

Brand	Alesis
Model	Microverb
Category	Recording Equipment
Language	English

Summary

Preface

Warnings

Regarding the Power Supply Fuse

Caution regarding replacement of power supply fuses to prevent fire or electrocution.

Regarding the Internal Battery

Caution regarding internal battery replacement to prevent explosion.

Safety Instructions

General Description

Power Supply

Analog Signal Paths

Digital Signal Paths

The DASP 16 ASIC

Detailed description of the DASP-16 ASIC pin functions and diagrams.

The Shaft Encoder

Explanation of the shaft encoder circuit's function and signal path for program switching.

Overflow Indicator

Logic for controlling the tricolor LED for signal presence and overflow conditions.

Successive Approximation

Updates and Corrections

C13

Correction for C13 capacitor replacement from blue monoblock to film type.

C16

Correction related to C16 capacitor and LED indication of overflow.

C20

Correction for C20 capacitor replacement from Mylar to film type for signal integrity.

C23

Correction if C23 is faulty, affecting effects output.

C32

Correction if C32 is faulty, affecting +5V rail stability.

Input/Mix/Output Potentiometers

Recommendation to replace all potentiometers together due to scratchiness.

Goldstar 4053s (U9)

Recommendation to replace Goldstar 4053s with Phillips CD4053s due to unreliability.

Goldstar 7404s (U11)

Recommendation to replace Goldstar 7404s with TI 74HC14s to prevent program switching pops.

Beige Power Supply Jacks

Recommendation to replace older beige power supply jacks with black ones.

Test Procedures

Troubleshooting and Repair

Service Parts List