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アンプ Pioneer GM-4200のPDF サービスマニュアルをオンラインで閲覧またはダウンロードできます。Pioneer GM-4200 35 ページ。 Bridgeable power amplifier
Pioneer GM-4200 にも：サービスマニュアル (36 ページ)

GM-H200

2. CONTROLS AND THEIR USE (UC MODEL)

Power Indicator

The power indicator lights when the power is switched on,

©RCA Input Level Control

Adjusting the RCA input level control will help match the

output of the car stereo to the Pioneer amplifier. If the

output is low even when the volume of the car stereo is

turned up, turn this control clockwise. If there is distortion

when the volume of the car stereo is turned up, turn this

control counterclockwise.

• Adjust control O with the supplied adjustment screwdriver.

Keep the screwdriver if you need to readjust the controls later.

BFC (Beat Frequency Control) switch

Note:

Beating is the combining of two or more frequencies to produce

sum and difference frequencies called beats.

If beating is heard when listening to AM stations on you car

radio, change the position of the BFC switch on the bottom

of the amplifier with a small flat-bfaded screwdriver.

BFC switch

Compulsory fan cooling system

This is a high-power amplifier, so it produces a lot of heat.

To keep it cool, it has fan cooling.

• When the power of the car stereo is turned on, the compulsory

cooling fan of this power amplifier works automatically and

cools inside of this amplifier.

• Install the amplifier so there is enough space front and back to

allow the fan cooling to work properly. If the front or back side is

covered, the amplifier may malfunction or fail.

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Compulsory fan

cooling air outlet