Self-Powered Concert Series
Service Manual
MP-2/4 Amplifier
Doc #: 05.033.040.01
Rev.: A
Date: 08/31/98
Page: 4 of 26
© 1998 Meyer Sound Laboratories, Inc. All rights reserved.
Pre-Service Checks and Precautions:
1. When servicing any electronic assemblies, a clean low static bench should be used and
internal assemblies should be kept free of metallic debris.
2. AC power must be disconnected and the Power Supply module allowed to bleed for at
least 3 minutes before performing any work inside the chassis.
3. While individual electronic components are very sensitive to static electricity, the
completed subassemblies and boards used in the MP-2/4 are of relatively low static sensitivity.
It is always preferable to use a static control station, but in lieu of this, careful handling will
minimize the potential for static damage. When reaching for an assembly (this is when the
greatest static potential exists), never grab connector pins or component leads, pickup and
handle the assembly by its edges or mounting brackets. Always lay assemblies on the same
work surfaces as the other electronics which should be a low static or semi-conductive surface.
Avoid placing foam or plastic underneath objects as they hold capacitive/static charge.
4. Use caution not to bend any vertical components on the circuit boards as this stress to the
components can seriously shorten their life.
5. If there is any dirt, dust, or oil buildup in the chassis, it should be cleaned before
reassembling.
6. The low frequency drivers should always be checked for splashed ferro-fluid, aged
suspension, and DC resistance when servicing any of the electronics. A low oil or fatigued low
frequency driver will jeopardize the newly serviced electronics, possibly damaging the entire
amp/heatsink module. Refer to “Low Driver Inspection and Evaluation Procedure for Self
Powered Series Products” (# 17.010.120.01). A fatigued driver should always be replaced using
an HTS grade driver.
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