VENT VOIDING THE WARRANTY. If the amp repeatedly blows fuses, it should be taken to a qualified service center for repair.
WARNING: THE FUSE SHOULD ONLY BE REPLACED WHEN THE POWER CORD HAS BEEN DISCONNECTED FROM ITS POWER SOURCE.
POWER SWITCH (28)
Center position is OFF. Two ON positions are provided, one of which will properly ground the amplifier. Switch to the ON side that yields the lowest amount of residual hum or popping noise when the instrument is touched. 220 and 240 volt models have a
LINE CORD (120 V PRODUCTS ONLY) (29)
For your safety, we have incorporated a
OUTPUT BARRIER STRIP (30)
Provided for connection of external speakers. Power output is 150 watts RMS. This is available as a direct output from the power amplifier or as transformer isolated outputs. Transformer outputs can be used for an 8 ohm
(35 V) loudspeaker or used to drive 25 V or 70 V speaker systems. Only one output should be used at a time. The balanced transformer isolated line level output is provided for connection to booster power amplifiers, additional sound systems, etc. This output is designed to deliver 1 V RMS into a 600 ohm load.
CHANNEL 1-8
|
| PHANTOM |
|
|
| POWER |
|
|
|
| +48VDC |
| 6.8K | 6.8K | MIC |
LOW Z | 1 |
| PREAMP |
|
| - | |
MIC | 3 |
| |
INPUT | 2 |
| + |
|
|
| |
LINE |
|
|
|
INPUT |
|
|
|
AUX/TAPE
LEVEL |
|
|
3 BAND EQ | ||
|
| MAIN BUS |
Low | Mid | AUX |
Hi | ||
|
| AUX BUS |
|
| MON BUS |
MON |
| 600 OHM HI |
|
| 600 OHM LO |
|
| GND |
|
| 4 OHM |
|
| XFMR |
AUX IN
TO MON
|
| N/C |
POWER AMP |
| COMMON |
| OUTPUT | 8 OHM |
|
|
AUX/TAPE
TO MAIN
TAPE IN
PA IN | XFMR | 25 V |
| SPS | 70 V |
|
|
MAIN OUT GR IN
MAIN BUS
MAIN
| 9 BAND GRAPHIC EQUALIZER |
63 125 | 250 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz |
GR OUT
TAPE
TAPE OUT
MON
MON BUS 
AUX
AUX BUS
MON OUT
| IRM™ 8150 |
AUX OUT | BLOCK DIAGRAM |
7