QSC DSP-4 Referenzhandbuch

1DSP0009 rev. A.

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)

Service Bulletin

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

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.

Continued on next page

➜

Figure 1. The problems may occur when these two screws

are tightened.

Figure 2. Locate the microcontroller U7.

2DSP0009 rev. A.

Contact information

This bulletin is available for download from the Service Bulletins page in the

Tech Support

section of the QSC Audio Web site:

http://www.qscaudio.com/support/technical_support/bulletins.htm. If you need any further information regarding this

service procedure, please contact QSC Technical Services at the addresses or numbers below.

Telephone:

1-800-772-2834 (within USA only)

+1 (714) 957-7150

Fax:

+1 (714) 754-6173

E-mail:

[email protected]

Web sites:

www.qscaudio.com (product info/support)

www.qscstore.com (on-line accessory and replacement component sales)

Postal and parcel address:

QSC Audio Products, Inc.

Technical Services Group

1665 MacArthur Blvd.

Costa Mesa, CA 92626 USA

Reassembly

7. Reassemble the two PCBs by

connecting the two headers J10 and

J1.

8. Insert the PCB assembly into the

chassis, while making sure the power

and signal LEDs are lined up correctly

in their appropriate openings.

9. Place the cover on the chassis. Insert

and tighten all 18 screws.

Procedure: Testing the DSP-4

1. Mount the DSP-4 to the rear of a QSC CX, DCA, PL2, or SRA Series amplifier equipped with a single DataPort (Figure 1).

2. Install the two long screws next to the DataPort.

3. Install the #8-32 screw to secure the right side of the DSP-4 to the amplifier.

4. Plug a 9-pin serial cable into the DSP-4’s RS-232 connector (Figure 3).

5. Plug the other end of the serial cable into an available COM port on your computer. Tighten the retaining screws.

6. Turn the amplifier on and confirm that the DSP-4 has power.

7. Launch the Signal Manager application.

8. Confirm that the DSP-4 can communicate with Signal Manager.

Figure 3. Connect the DSP-4 to the computer via the 9-pin serial port.

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