Gemini Sound PMX-1400 Service manual

SERVICE MANUAL

PMX-1400

Stereo Preamp Mixer

CONTENT’S:

Connections & Operations:............................................................Page 2-5

Specifications:.....................................................................................Page 5

Parts Lists:........................................................................................Page 5-6

PCBs:................................................................................................Page 7-9

Schematics...................................................................................Page 10-11

Gemini Sound Products Corp.

120 Clover Place P.O. Box 6928

Edison, NJ 08818-6928

732-738-9003 (Phone) • 732-738-9006 (Fax)

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PMX-1400

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123

L1 PH1

PH1

PH2

PH3

REC

BOOTH

AMP

MAIN POWER

GND LIFT

RIGHT LEFT

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INTRODUCTION:

Congratulations on your purchase of the Gemini PMX®-1400 Mixer. This state-of-the-art unit is backed by a three year warranty, excluding crossfader and channel slides. Prior to use, we suggest that you carefully read all the instructions.

PHONO/LINE SWITCH (44) enables you to set the (43) input to Phono or Line. PHONO/LINE SWITCH (47) enables you to set the

(46) input to Phono or Line. Attach phono ground line to the GROUND THUMB SCREW (49).

7. Headphones may be plugged into the front panel mounted

HEADPHONE (32) jack.

FEATURES:

• 4 Stereo Channels

• Talkover

• State-of-the-Art Cue Section

• Dual 7 Band Graphic Equalizers

• Booth and Record outputs

• Balanced and Unbalanced Master Outputs

• 3 Phono/Line Convertible, 5 Line, and 2 Mic Inputs

CAUTIONS:

1. All operating instructions should be carefully read before using this equipment.

2. To reduce the risk of electrical shock, do not open the unit.

THERE ARE NO USER REPLACEABLE PARTS INSIDE.

Please refer servicing to a qualified service technician.

In the USA: If you experience problems with this unit, please call 1 (732) 969-9000 for Gemini Customer Service. Do not attempt to return this equipment to your dealer.

3. Do not expose this unit to direct sunlight or to a heat source such as a radiator or stove.

4. This unit should be cleaned only with a damp cloth. Avoid solvents or other cleaning detergents.

8. The PMX-1400 comes with a front panel BNC LIGHT (25) jack for use with a (not provided) gooseneck light.

USING THE GROUND LIFT SWITCH:

Depending on your system configuration, application of the ground will sometimes create a quieter signal path. Lifting the ground occasionally eliminates ground loops and “hum” to create a quieter signal.

1. With the mixer ON, listen to the system in “idle” mode (no signal present) and with the ground “applied” and the GROUND LIFT SWITCH (50) in the LEFT position.

2. Turn the power OFF before moving the GROUND LIFT

SWITCH (50). “Lift” the ground by moving the GROUND LIFT SWITCH to the RIGHT, turn the power back ON and listen to

determine which position provides 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 MIXER.

CABLE. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS!

OPERATION:

1. POWER: Once you have made all the equipment connections to your mixer, press the POWER SWITCH (26). The power will turn on and the POWER LED (27) will glow RED.

5. When moving this equipment, it should be placed in its original carton and packaging. This will reduce the risk of damage during transit.

6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

7. DO NOT USE SPRAY CLEANER OR LUBRICANT ON CONTROLS

OR SWITCHES.

CONNECTIONS:

1. Before plugging the power cord in, make sure that the VOLTAGE SELECTOR (33) switch is set to the correct voltage.

NOTE: THIS PRODUCT IS DOUBLE INSULATED AND IS NOT INTENDED TO

BE GROUNDED.

2. Make sure that the POWER (26) switch is in the OFF position. The POWER LED (27) display will be off.

3. The PMX-1400 is supplied with four sets of output jacks: The MAIN

OUTPUT (34) jacks connect to the main amplifier. The BALANCED MASTER OUTPUT (99) jacks connect the mixer to main amplifier

using standard cables with 1/4” connectors. We recommend using balanced cables if the distance to your amp is 10 feet or more. The REC OUTPUT (36) jacks can be used to connect the mixer to the record input of your recording unit, thus enabling you to record your mix. The BOOTH OUTPUT (35) jacks allow the connection of an additional amplifier.

4. The MIC 1 input (located on the front panel) accepts an XLR connector. The MIC 2 (48) input (on the rear panel) accepts 1/4" connectors. All accept balanced and unbalanced microphones.

5. On the rear panel are three stereo PHONO/LINE (40, 43, 46) inputs and five stereo LINE (37, 38, 39, 42, 45) inputs: PHONO/LINE SWITCH (41) enables you to set the (40) input to Phono or Line.

2. CHANNEL 1: Switch (9) allows you to select PHONO 1/LINE 1 (46) or the LINE 2 (45) input. CHANNEL SLIDE (10) controls the input level of this channel.

3. CHANNEL 2: Switch (11) allows you to select PHONO 2/LINE 3 (43) or the LINE 4 (42) input. CHANNEL SLIDE (12) controls the input level of this channel.

4. CHANNEL 3: Switch (13) allows you to select PHONO 3/LINE 5 (40) or the LINE 6 (39) input. CHANNEL SLIDE (14) controls the input level of this channel.

5. CHANNEL 4: Switch (15) allows you to select either the LINE 7 (38) or LINE 8 (37) input. CHANNEL SLIDE (16) controls the input level of this channel.

6. CROSSFADER: The CROSSFADER (18) allows the mixing of one source into another. The PMX-1400 features an assignable crossfader. The ASSIGN (17, 19) switches allow you to select which channel will play through each side of the crossfader.

7. ASSIGN (17) switch has five settings (OFF, 1, 2, 3 and 4) and allows you to direct Channel 1, 2, 3 or 4 through the LEFT side of the crossfader. ASSIGN switch (19) also has five settings (OFF, 1, 2, 3 and 4) and allows you to direct Channel 1, 2, 3 or 4 through the RIGHT side of the crossfader. Placing either ASSIGN switch in the OFF position inactivates that side of the crossfader. The CROSSFADER in your unit is removable and, should the need arise, can be easily replaced. Replacement crossfaders are

available in three models: the RG-45 PRO (RAIL GLIDE™) Dual- Rail Crossfader; as well as RF-45, which has a 45mm travel from side-to-side; and the PSF-45, which features a special “curve” designed for scratch mixing. Your Gemini mixer is equipped

with an RG-45 PRO (RAIL GLIDE™) 45MM DUAL-RAIL CROSSFADER featuring internal dual stainless steel rails that allow the slider to ride smoothly and accurately from end-to-end.

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