Ii. installation, Tools needed, Ground – JBL MPC-X100 100 Hz User Manual

Page 2

II. Installation

CAUTION: The MPC-X100 contains active components which can be damaged by electro-

static discharge (ESD). Be sure to practice standard ESD precautions, and always ground

yourself and your workstation before handling exposed circuit cards.
Installing the MPC-X100 requires PC board soldering skills. Only qualified service technicians

should attempt it. Any authorized JBL service center can perform the installation.
The MPC-X100 installs on the amplifier input board of any JBL MPA or MPC amplifier.

Tools needed:

Soldering iron
¼-inch (6.3 mm) nutdriver
Phillips screwdriver
Wire cutters
Rosin-core solder
Desoldering iron or other suitable desoldering equipment (Do not use desoldering braid; it can

damage the solder pads on the input board and might not remove solder adequately.)

CAUTION: Preparing the input board for installation of the MPC-X100 involves removing

solder from feed-through holes on a 2-sided circuit board. Excessive heat can damage the

solder pads you will be working on. Proper equipment and experience with desoldering

delicate PC board circuitry is essential to successfully perform the procedure. Damage caused

by improper installation is not covered under warranty.
1 Turn off the amplifier and disconnect the AC power cord from the AC source. Disconnect

all cables from the amplifiers input panel.

2 Position the amplifier so the rear of the chassis is facing you. The input panel is located on

the left side of the rear panel. See Figure 2a.

3 Locate and remove the screws securing both the upper blank and the lower input panels to

the rear side of the chassis (2 screws on each mini panel). The upper blank panel will

simply drop off when its screws are removed.

4 Gently pull the lower input panel out from the amplifier. Once it is removed, you will

notice a ribbon cable connecting the input PC board to the amplifier. Disengage the

locking wing clamps on the ribbon header and carefully remove the ribbon head from the

socket on the board. Now the input panel assembly is completely free from the amplifier.

5 Desolder and remove the wire jumper pairs indicated in Figure 2b or 2c.
6 Under where the jumpers were located, youll find two rows of solder pad holesone

with 10 holes and another with 12 holes. Remove the solder from all 22 holes.

7 With the input panel facing you and the component side of the MPC-X100 board facing

away from you, carefully insert the header pins of the MPC-X100 fully into the socket

holes. Turn the assembly over and solder the MPC-X100 in place. Make sure all the header

pins are well soldered. Visually inspect for cold solder joints and verify that you have

sufficient clearance to re-install the ribbon connector on the top side of the assembly.

Finish by trimming the MPC-X100 header pins as required.

CH1

CH2

CH1

CH2

BRIDGE

MONO

BRIDGE

MONO

LOW IMPEDANCE

DIR. OUTPUT

ISOL.OUTPUT

AUDIO TRANSFORMER

70V

25V

100V

0 70 100

-dB

STEREO

CH2 INPUT CH1

CH2 CH1

PARALLEL BRIDGE

LEVEL

GROUND

INPUT

Figure 2a. The input panel’s location
on the rear panel of the amp

Figure 2b. The input panel (MPC)

Input panel

Figure 2c. The input panel (MPA)

Wire jumpers: W303/304 and
W403/404 (MPC); or W305/
306 and W405/W406 (MPA)

Solder holes for MPC-XU