Crown PIP-AMC Technical Information download pdf (Page 46)

Page 46

Com-Tech 200/400/800/1600 Power Amplifiers

8.2 Com-Tech 200 Cooling Fan

A three-speed cooling fan (part GCT200FAN) is avail-

able for North American

Com-Tech 200s

(all other

units include a fan). We strongly recommend the kit if

you will be operating a

Com-Tech 200

at high levels or

in high temperatures for long periods (see Section

3.2.1).

CAUTION: Because the installation of this fan involves

the risk of electric shock, it should ONLY be attempted

by a qualified technician.

Each cooling fan kit contains the following parts:

Fan motor (H42934-2)

Fan blade (C 9939-7)

Mounting bracket (F11106-6 or D 8439-8)

2 phillips flat head 6-32 machine screws (C 7062-0)

2 torx head 6-32 machine screws (A10110-70605)

Installation is not difficult, but you should be sure the

unit’s power cord is unplugged before beginning.

1. Turn off the amplifier and disconnect its power

cord from the AC power receptacle.

2. Remove the top cover of the amplifier. Use a

phillips screwdriver to remove the two screws that

secure it to the back panel. Gently pry the back of

the cover up and away from the chassis, then pull

the front up and back to unhook it.

WARNING: The power supply capacitors are very

large and can cause shock. Always discharge

them before working in close proximity.

3. Locate the two large power supply capacitors on

FRONT

TOP VIEW

Fig. 8.2 Cooling Fan Option

SUB–CHASSIS

A10110-70605

C 7062-0

H42934-2

C 9939-7

F11106-6

or D 8439-8

COLLAR

either side of the

P.I.P.

compartment. Safely dis-

charge them by placing a 100 ohm, 10 watt resis-

tor across the + and – terminals of each capacitor.

Use caution: DO NOT TOUCH the discharge re-

sistor—it can become quite hot. (Use pliers to hold

the resistor while you discharge the capacitors.)

4. Attach the fan motor to its bracket using the two

flat head screws supplied in the kit (Figure 8.3). A

phillips screwdriver is required.

5. Push the fan blade on the motor shaft until the

shaft end is flush with the collar (Figure 8.3). The

fan blades should be positioned so the collar

faces away from the fan motor.

6. Attach the fan assembly to the subchassis (Fig-

ures 8.2 and 8.3) with the two torx head screws

supplied in the kit (a torx nut driver is required).

The fan motor assembly should be positioned with

the wires facing the front of the amplifier.

7. Connect a wire from the fan motor to jumper block

W3 and the remaining wire to W2 as shown in Fig-

ure 8.2. (It doesn’t matter which wire goes to which

location because the fan uses an AC motor.)

8. Replace the cover and reconnect power.

8.3 Constant Voltage Computer

Crown’s constant voltage computer is a easy-to-use

slide rule for audio applications. The first scale finds

the impedance of a step-down transformer based on

delivered power and the transformer’s rated voltage.

This scale also identifies the proper transformer tap to

use when a particular constant voltage rating is not

provided with the transformer (such as 25, 35, 50, 70,

100 or 140 volts). Other scales include line loss, paral-

lel resistance, dB-SPL vs. distance and dB-SPL vs.

power. To get your own constant voltage computer,

call Crown’s Technical Support Group and ask for lit-

erature.

Fig. 8.3 Cooling Fan Assembly

1 2 ... 41 42 43 44 45 46 47 48 49

Comments to this Manuals

No comments

Crown PIP-AMC Technical Information Page 46

Comments to this Manuals

Related products and manuals for Processors Crown PIP-AMC