Gemini BPM-500 Service Manual Download Page 4

Page: 4 / 12

Page 4

Connections

1. Before plugging in the power cord, make sure that the

VOLTAGE

SELECTOR (44)

switch is set to the correct voltage.

NOTE

TE: This product is double insulated and not intended to

be grounded.

2. Make sure that the

POWER (39)

switch is in the off position. The

POWER LED (38)

will be off.

3. The BPM-500 is supplied with 4 sets of amp output jacks. The

BALANCED OUTPUT (45)

jacks are used to connect to your main

amplifier using standard XLR cables. We recommend using the
balanced amp outputs if the cables to your amp are 25 feet or more.

BALANCED OUTPUTS

have three separate conductors, two of which

are signal (positive and negative) and one shield (ground). Pin 1 is
ground (shield). Pin 2 is signal hot (positive). Pin 3 is signal cold
(negative). The

MAIN OUTPUT (46)

jacks are unbalanced and used to

connect to your main amplifier. The

REC OUTPUT (48)

jacks can be

used to connect the mixer to the record input of your recorder enabling
you to record your mix. The

BOOTH OUTPUT (47)

jacks allow you to

hook up an additional amplifier.

4. The

MIC 1 (1)

input (found on the front panel) accepts a 1/4" or XLR

connector.

The

MIC 2 (63)

input and the

MIC 3 (53)

input (found on the

rear panel) accept 1/4" connectors. All accept balanced and
unbalanced microphones.

5. On the rear panel are 3 stereo

PHONO/LINE (55, 59, 62)

inputs and 5

stereo

LINE (51, 52, 54, 57, 60)

inputs. The

PHONO/LINE

SWITCH

(56)

enables you to set the

(55)

input to Phono or Line. The

PHONO/

LINE

SWITCH (58)

enables you to set the

(59)

input to Phono or Line.

The

PHONO/LINE

SWITCH (61)

enables you to set the

(62)

input to

Phono or Line. The phono inputs will accept only turntables with a
magnetic cartridge. A

GROUND SCREW (64)

for you to ground your

turntables is located on the rear panel. The stereo line inputs will
accept any line level input such as a CD player, a cassette player, etc.

6. Headphones can be plugged into the front panel mounted

HEADPHONE (43)

jack.

7. The BPM-500 comes with a front panel

BNC LIGHT (37)

jack. This

jack is for use with a gooseneck light like the Gemini GNL-700.

8. There are

LOOP INPUTS (50)

and

LOOP OUTPUTS (49)

located on

the rear panel. If you are using an outboard signal processor, you can
use the

LOOP OUTPUTS (49)

to send the signal to the device and the

LOOP INPUTS (50)

to bring the signal back in to the mixer. The unit

comes with jumpers to be used with the loop inputs and outputs. Keep
the jumpers in the unit if you are not using the loop to prevent
interruptions in your music program.

Using the Ground Lift Switch

Depending on your system configuration, sometimes applying the ground
will create a quieter signal path. Sometimes lifting the ground can
eliminate ground loops and hum to create a quieter signal path.

1. With the mixer on, listen to the system in idle mode (no signal present)

with the ground applied (the

GROUND LIFT

SWITCH (65)

in the left

position).

Then turn the power off before moving the GROUND LIFT SWITCH
(65)

. Lift the ground by moving the

GROUND LIFT SWITCH

to the

right, turn the power back on and listen to determine which position will
provide a signal devoid of background noise and hum. Keep the

GROUND LIFT

SWITCH

in the ground position if the noise level

remains the same in either position.

CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER
MIXER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE
HAZARDOUS.

Operation

1. POWER ON: Once you have made all the equipment connections to

your mixer, press the

POWER SWITCH (39)

. The power will turn on and

the

POWER LED (38)

will glow RED.

2. CHANNEL 1: The

GAIN (8)

HIGH (9)

MID (10)

and

LOW (11)

controls allow you to fully adjust the selected source. Switch #

(12)

allows you to select the

PHONO 1/LINE 1 (62)

or the

LINE 2 (60)

input. The

CHANNEL SLIDE (13)

controls the input level of this

channel.

3. CHANNEL 2: The

GAIN (8)

HIGH (9)

MID (10)

and

LOW (11)

controls allow you to fully adjust the selected source. Switch #

(14)

allows you to select the

PHONO 2/LINE 3 (59)

or the

LINE 4 (57)

input.

The

CHANNEL SLIDE

(15)

controls the input level of this channel.

4. CHANNEL 3: The

GAIN (8)

HIGH (9)

MID (10)

and

LOW (11)

controls allow you to fully adjust the selected source. Switch #

(16)

allows you to select the

PHONO 3/LINE 5 (55)

or the

LINE 6 (54)

input.

The

CHANNEL SLIDE

(17)

controls the input level of this channel.

5. CHANNEL 4: The

GAIN (8)

HIGH (9)

MID (10)

and

LOW (11)

controls allow you to fully adjust the selected source. Switch #

(18)

allows you to select the

LINE 7 (52), LINE 8 (51)

or the

MIC 3 (53)

input. The

CHANNEL SLIDE

(19)

controls the input level of this

channel.

NOTE

TE: There is Low, Mid and High equalization for each

channel with an extremely wide range of adjustment.

SUGGESTION: You can use the Cut Features on each channel to
remove Low, Mid and/or High to create special effects.

6. CROSSFADER SECTION: The

CROSSFADER (26)

allows the mixing

of one source into another. The BPM-500 features an assignable
crossfader. The

ASSIGN (23, 28)

switches allow you to select which

channel will play through each side of the crossfader. The

ASSIGN (23)

switch has 4 settings (1, 2, 3 or 4) and allows you to select channel 1, 2,
3 or 4 to play through the left side of the crossfader.

The

ASSIGN (28)

switch has 4 settings (1, 2, 3 or 4) and allows you to select channel 1, 2,
3 or 4 to play through the right side of the crossfader. There are two

OFF

(22, 30)

buttons for the crossfader. When the

OFF (22)

button is

pressed, the left side of the crossfader will be inactive and the

OFF

LED (21)

will light. When the

OFF (30)

button is pressed, the right side

of the crossfader will be inactive and the

OFF LED (29)

will light. Using

the

OFF

button, be sure to deactivate the crossfader before changing

the

ASSIGN

setting. This will avoid any click or popping sound in your

signal while you are changing the assign setting. The

CROSSFADER

(26)

in your unit is removable and if the need arises can be easily

replaced. Crossfader units are available in three varieties. Part # RF-45
(which is identical to the crossfader supplied with the mixer) has a 45
mm travel from side to side. Part # RF-30 is available with a 30 mm
travel distance. Also available is the PSF-45 with a special curve
designed for scratch mixing. Just purchase one of these crossfader
units from your Gemini dealer and follow these instructions:

1. Unscrew the outside FADER PLATE SCREWS (B). Do not

touch the INSIDE SCREWS (C).

2. Carefully lift the fader and unplug the CABLE (D).

3. Plug the new fader into the cable and place it back in the

mixer.

4. Screw the fader to the mixer.