Carver pm125 Manuale Utente

C37

P3

P4

14

J14

P5

P6

2   1

RP2

J15

J16

RP1

J1

U5

U4

ADD THIS JUMPER TO

ACTIVATE THE CH2

CLIPPING ELIMINATOR

STEREO/MONO

SWITCH

CH2 LEVEL

BYPASS

CH1 LEVEL

BYPASS

ADD THIS JUMPER TO

ACTIVATE THE CH1

CLIPPING ELIMINATOR

Servicing Instructions

CAUTION: To reduce the risk of electric shock, do not perform any servicing other than that contained in the
Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel.

The Stereo / Mono Switch is located on the amplifier’s main circuit board (see Figure 8) and accessible from the back
panel. Leave the switch centered for normal stereo operation, move it to the left for Bridged Mono operation, and
move it to the right for Dual Mono operation.

The Level controls can be bypassed by moving the jumpers for CH1 and CH2 (J15 and J16), which are located on
the amplifier’s main circuit board near the level adjustment pots (see Figure 8). This will lock the amplifier into full
gain (as if the Level pots were fully clockwise). 

The input sensitivity of the amplifier is set at the factory to 1.5V

RMS

for rated output. To increase the sensitivity by

6dB to 0.775V

RMS

, install jumpers JP1 (CH1) and JP11 (CH2). Sockets for these jumpers are located on the

amplifier’s main circuit board (see Figure 9).

The XLR input connectors on the pm125

/

pm420 are shipped from the factory with pin 2 hot (+), as indicated on the rear

panel. The polarity of the balanced inputs can be reversed by changing four jumpers located on the amplifier’s main circuit
board. Crosswire JP3 and JP4 to change the input polarity of CH1 and crosswire JP101 and JP102 to change CH2 (see
Figure 8).

The clipping eliminator circuit can be activated by installing jumpers in sockets JP9 (CH1) and JP6 (CH2) (see Figure 8). 

Figure 8

16

17

17