Service Bulletin

 

Title:

DSP-4 RS-232 Communication/Turn-Off Thump

 

Bulletin #:

DSP0009

 

Issue Date:

July 27, 2006

 

Models Affected:

DSP-4

 

Bulletin Revision:

Rev. A

 

Production Range:

05/2001 through 05/2006 (serial numbers 0501xxxxx–0506xxxxx)

 

 

 

 

 

 

Description

When a DSP-4 unit is mounted directly to a QSC single DataPort equipped amplifier and the two long screws shown in Figure 1 are tightened, the torque bends the two internal PCB boards slightly. This causes the leads from U7 (a 20-pin DIP microcontroller) to touch the top of capacitors C42 and C45, causing communication and audio problems. To correct this inadvertent connection, trim all 20 of U7’s lead pins.

Symptoms

When mounted directly to a QSC single DataPort-equipped amplifier and the two #4-40 screws shown in Figure 1 are tight- ened, the DSP-4 may exhibit any of these problems:

•Loss of RS-232 communication with the computer and the Signal Manger software

•A thump on the output signals during turn off.

•A buzz in the output signals.

Instructions

Tools and materials required:

•#2 Philips screwdriver

•Small boxes or compartments (to hold assorted screws during disassembly)

•Small diagonal cutters

Figure 1. The problems may occur when these two screws are tightened.

Caution: Take appropriate anti-static measures to guard against damage from electrostatic discharge (ESD).

Procedure: Trimming the leads on the microcontroller U7

Gaining access to the IC

1.Disconnect the DSP-4 from the amplifier.

2.Remove all 14 screws on the front panel of the DSP-4. Turn the DSP-4 on its side and remove the other two screws, then flip the DSP-4 over (Data Port receptacle side) and remove the remaining ones. Note that there are four different screw sizes.

3.Gently and carefully pull the chassis apart and remove the printed circuit board (PCB) assembly.

4.Separate the two PC boards and locate the one with the QSC part number that begins with WP-000411-.

5.Locate the microcontroller U7. See Figure 2.

6.Use small diagonal cutters to trim all 20 leads of U7.

Figure 2. Locate the microcontroller U7.

Continued on next page ➜

DSP0009 rev. A.

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QSC Audio DSP-4 RS-232 manual Description, Symptoms, Instructions, Tools and materials required
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DSP-4 RS-232 specifications

The QSC Audio DSP-4 RS-232 is a cutting-edge digital signal processor designed for professional audio settings, offering unmatched flexibility and precision in audio management. It is particularly suited for installations in venues such as theaters, conference rooms, and large entertainment spaces where high-quality audio control is crucial.

One of the standout features of the DSP-4 is its comprehensive signal processing capabilities. The device comes equipped with four input and four output channels, allowing users to manage multiple audio signals simultaneously. This multi-channel configuration enables seamless routing and manipulation of audio sources, making it ideal for complex sound environments.

The DSP-4 utilizes advanced algorithms for audio processing, ensuring high fidelity and clarity. It includes a range of built-in effects like equalization, dynamic processing, delay, and crossover management. This ensures that audio engineers can tailor the sound to meet the unique needs of any event or venue, optimizing the listening experience for audiences.

Connectivity is another strong feature of the DSP-4. It supports RS-232 control, which allows for remote control and integration with other systems. This capability is essential for automated environments where audio management needs to be synchronized with lighting and video systems. Additionally, Ethernet control options provide more user-friendly interfaces for monitoring and making adjustments.

Moreover, the DSP-4 boasts a user-friendly interface with a graphical display that simplifies programming and operation. Users can easily configure settings and recall presets, making it accessible for both seasoned audio professionals and less experienced operators alike.

The DSP-4 is built for durability and reliability, designed to withstand the rigors of professional environments. Its robust construction ensures that it remains operational under various physical conditions, establishing it as a staple in professional audio setups.

In summary, the QSC Audio DSP-4 RS-232 combines advanced signal processing, flexible routing capabilities, and ease of use into a single solution for professional audio management. Its features cater to a wide range of applications, solidifying its position as a powerful tool for enhancing audio performance in diverse environments. The integration of cutting-edge technologies and user-friendly design make it an excellent choice for audio professionals seeking to elevate their sound systems.
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