EMG MMTW Service manual

INSTALLATION INFORMATION
EMG MODEL: MMTW
Warranty
All EMG Pickups and accessories are warranted for a period of two years. This warranty does not cover failure due to improper installation, abuse or damage. If
upon examination the pickup is determined to be defective, a replacement will be made. Warranty replacement products are covered by this same warranty. This
warranty covers only those pickups and accessories sold by authorized EMG Dealers. This warranty is not transferable.
© 2012 Copyright EMG INC. All Rights Reserved.
PO BOX 4394
SANTA ROSA, CA
95402 USA
P [phone]
F [phone]
EMGPICKUPS.COM
0230-0146B
Installation notes:
The EMG-MMTW has a variety of ways it can be wired into a bass. The diagrams included are limited to the most popular because of space.
The additon of the plug-on PC Board on the Push-Pull Pot adds further flexibility as you will see in the diagrams. We suggest you look fully at the
installation diagrams included in this sheet along with the B157 Pickup Buss data sheet included in this package before beginning your installation.
The Push-Pull Pot allows you 2 options as a volume control and 2 other options using the pot as a tone control. If you don’t see a diagram that
fits your instrument directly, or you want to do something completely different, contact our technical department and we’ll create a diagram you can
follow for your installation. Certain limitations apply...
SPECIFICATIONS: MODEL:
MMTW Single-Coil Dual-Coil
Logo Color Copper
Magnet Type* C/S
Resonant Frequency (KHz) 3.50 2.50
Output Voltage (String) 1.00 2.00
Output Voltage (Strum) 3.00 4.50
Output Noise (60 Hz) -107 -107
Output Impedance (Kohm) 10 10
Current @9V (Microamps) 160
Battery Life (Hours) 1500
Maximum Supply (Volts DC) 27
* Magnet Type CS (Ceramic and Steel)
IMPORTANT INSTALLATION NOTES:
1) We recommend operating Dual-Coil EMG Pickups with an 18 Volt
power supply. This will help avoid distortion, especially if you add
EQ accessories to your instrument.
Use an Alkaline or Lithium battery for longest life.
2) The Volume Control included with the EMG System is 25K Ohm.
This value is required for the system to work correctly.
3) A stereo output jack (12B) is included with the EMG Pickups;
it grounds the black battery wire to turn on the pickups when
the plug is inserted into the jack. If you are replacing passive
pickups, make sure to use the jack included. If your guitar has a
long panel jack make sure it is a stereo type, a Switchcraft 152B
is recommended.
4) When installing any EMG Active Pickup, DO NOT connect the
bridge ground wire. This wire is usually soldered to a volume or
tone control casing and goes to the bridge. This wire grounds the
strings and uses them and your body as a shield against hum and
buzz. It also creates a shock hazard.
EMG Pickups are shielded internally and DO NOT require string
grounding. This greatly reduces the possibility of reverse
polarity shock from microphones and other equipment.
5) Dynamic performance is affected by the distance between the
pickup and the strings. We recommend experimenting with pickup
height adjustment. Lowering the pickup will help reduce attack
transients and often give your instrument a more natural sound.
6) If your installation is different from the diagrams in these
instructions or you need additional diagrams visit our website:
emgpickups.com for a complete listing of available diagrams.
7) SPECIAL NOTE:
7) SPECIAL NOTE:
The diagrams shown are for EMG Active Pickups.
The diagrams shown are for EMG Active Pickups.
All diagrams show the Red Wire coming from the pickups
All diagrams show the Red Wire coming from the pickups
connected to the battery. If you are installing EMG-HZ
connected to the battery. If you are installing EMG-HZ
Passive Pickups refer to their diagrams. The Red Wire of
Passive Pickups refer to their diagrams. The Red Wire of
the HZ Pickup is NOT for battery power, it is a coil wire.
the HZ Pickup is NOT for battery power, it is a coil wire.
EMG-MMTW (SIDE VIEW)
In Dual-coil mode, coils L1 and L2 are active.
In Single-coil mode, coils L2 and L3 are active.
L1 L2
L3
.125 DIA. MOUNTING HOLES
3.500
.770
.950
3.700
1.900
R .250 TYP
R .125 TYP
.880
MAXIMUM RECOMMENDED STRING WIDTH 2.50"
2.900
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MMTW INSTRUCTIONS Page 2
General Notes:
Every attempt has been made to make this a solderless installation.
There are some instances where this is not possible;
1) If your instrument uses the long panel output jack and you had passive pickups
you will need a new stereo output jack, the Switchcraft 152B is recommended.
Soldering to the new jack will be required.
2) Some instruments may already have a battery holder installed, in that case
soldering may be required.
3) Instruments with two pickups may need soldering to the selection
switch in some installations.
Installation Instructions:
EMG Model: MMTW
Using the MMTW Push-Pull Switch
The Push-Pull Switch included allows you to choose between the two internal
pickups of the EMG-MMTW, single-coil and dual-coil. The Push-Pull Pot
has two seperate sections: The Switch and the pot, described below.
Refer to Diagrams #1 and #2
The push-pull switch section (DPDT) lets you choose between the
single-coil sound and a dual-coil sound by pulling or pushing the pot shaft
up or down. You have the option of having the single-coil sound in either
the up or down position and vice-versa for the dual-coil sound.
Diagrams #1 and #2 show how to connect the MMTW Pickup cable to choose
either option. Select the diagram that suits you and push the cable
connectors onto the single line 6-pin header.
Simply turn over cable connectors 1 and 2 to change the wire order
and this will choose between the two options.
Connector 3 remains the same for either choice.
Using the Pot Section as:
1) The Pickup Volume control, or a Master Volume for the Instrument.
Refer to Diagrams #3 and #4
The pot section (25KA) can be used either as a Volume control
for the pickup or, it can be used as the Master Volume for the guitar.
Diagrams #3 and #4 show how to connect either option.
Use the dual-line 12-pin header and push the cables on and
install the shunts as needed onto the labeled headers H1 thru H6.
Use Diagram #3 if you have a single MMTW installed in your instrument,
or have two or more pickups in your instrument and want to use the
pot as the Volume control for the MMTW Pickup only.
Installing the shunts on positions H4 and H6 sends the pickup signal
to the wiper of the 25K Pot, and the output of the 25K Pot is at position
H1 or H2.
Diagram #4 allows you to use the 25K Pot independently of the pickup output.
By taking the output of the pickup from position H5, the Volume control is now
available to use as a Master Volume with H1 or H2 being the input to the Volume
control. H1 and H2 positions are interchangeable.
Position H5, now the output of the pickup, would typically go to a selection switch
or a pan-pot. Don’t forget to install the shunt on H6.
Using the MMTW Push-Pull Pot Section
The Push-Pull Pot side of the EMG-MMTW allows you 4 different options:
1) Use the pot as a Master Volume for the Instrument
2) Use the pot as a Volume control for the MMTW Pickup
3) Use the pot as a Master Tone control for the Instrument
4) Use the pot as a Tone control for the MMTW pickup
On the PC Board there is a dual-line header with 6 pairs of pins. They are
listed on the PC Board as H1 through H6. By using the the connections
shown in Diagrams #3 through #6, you can choose any of the 4 options.
SHUNT ON (H6)
PICKUP OUTPUT (H5)
MASTER VOLUME
OUTPUT (H3)
MASTER VOLUME
INPUT (H1 OR H2)
Diagram #4
PUSH / PULL POT USED AS
THE MASTER VOLUME CONTROL
Diagram #1
HUMBUCKING ON: DOWN POSITION
SINGLE COIL ON: UP POSITION
Diagram #2
SINGLE-COIL ON: DOWN POSITION
HUMBUCKING ON: UP POSITION
FLIP CONNECTORS 1 AND 2
AS SHOWN
WIRE ORDER:
WHITE
GREEN
BLUE
YELLOW
ORANGE
SHIELD
WIRE ORDER:
GREEN
WHITE
YELLOW
BLUE
ORANGE
SHIELD
TO SELECTION SWITCH
(VIA B157 BUSS)
OR PAN-POT
PICKUP OUTPUT
(H1 or H2)
INSTALL SHUNT (H6)
INSTALL SHUNT (H4)
1
2
3
1
2
3
Diagram #3
PUSH / PULL POT USED AS
THE PICKUP VOLUME CONTROL
OR TO THE OUTPUT JACK IN SINGLE
PICKUP GUITARS WITH NO TONE
CONTROL
PICKUP OUTPUT:
TO TONE CONTROL OR
SELECTION SWITCH OR BUSS
FOR 2 OR 3 PICKUP GUITARS
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B124rH
TONE
Diagram #9
One MMTW Pickup
Master Volume and Tone Control
Diagram #8
One MMTW Pickup
Master Volume
MMTW INSTRUCTIONS Page 3
Using the Pot Section as:
2) The Pickup Tone control or as a Master Tone control for the instrument.
Refer to Diagrams #5 and #6
The pot section (25KA) can be used either as a Tone control
for the pickup or it can be used as a Master Tone control for the guitar.
Diagrams #5 and #6 show how to connect either option.
Use the dual-line 12-pin header and push the cables on and
install the shunts as needed onto the labeled headers H1 thru H6.
Use Diagram #5 if you have a single MMTW installed in your instrument,
or have two or more pickups in your instrument and want to use the pot as the
Tone control for the MMTW Pickup only.
Installing the shunt on position H4 connects a tone capacitor on the PC Board
to the wiper of the 25K Pot and creates a passive Tone control. The output of
pickup icanbe either position H1 or H2.
Diagram #6 uses the 25K Tone control independently of the pickup output.
By taking the output of the pickup from Position H5, the control is now
available to use as a Tone Control independent of the pickup output.
Position H3 is the input to the Tone Control, with H1 or H2 being the output of
the control, if necessary.
Position H5, the output of the pickup, would typically go to a selection switch
or output jack.
OUTPUT
T
R
S
BATTERY
NEG (-)
RED
RED
BATTERY
BUSS
PICKUP
VOLUME
CONTROL
MASTER TONE
OUTPUT
T
R
S
BATTERY
NEG (-)
RED
RED
BATTERY
BUSS
PICKUP
VOLUME
CONTROL
PICKUP OUTPUT:
TO VOLUME CONTROL
SELECTION SWITCH OR...
PICKUP OUTPUT
(H1 or H2)
INSTALL SHUNT ON (H4)
OUTPUT OF TONE CONTROL
(H1 or H2) ONLY IF NEEDED
INPUT TO TONE CONTROL (H3)
PICKUP OUTPUT
(H5)
- 9V +
- 9V +
Diagram #7
Insert the plug onto the 7 pin header
of the pickup as shown here.
Note the orientation arrow.
PICKUP OUTPUT TO
SELECTION SWITCH,
EMG ACCESSORY, OR...
Diagram #5
PP POT USED AS THE PICKUP
TONE CONTROL
Diagram #6
PUSH-PULL POT USED AS A MASTER
TONE CONTROL
FROM MMTW PICKUP
FROM MMTW PICKUP

B124rH
TONE
B124rH
TONE
B124rH
TONE
Diagram #7
One MMTW Pickup
Master Volume and Tone Control
Diagram #8
Two MMTW Pickups
Volume/ Volume/Tone
MMTW INSTRUCTIONS Page 4
OUTPUT
T
R
S
BATTERY
NEG (-)
RED
RED
BATTERY
BUSS
PICKUP
VOLUME
CONTROL
OUTPUT
T
R
S
BATTERY
NEG (-)
RED
RED
BATTERY
BUSS
PICKUP
VOLUME
CONTROL
MASTER TONE
PICKUP
VOLUME
CONTROL
MASTER TONE
MASTER TONE
- 9V +
Diagram #9
2 Pickups (1 EMG + 1-MMTW)
Toggle Style Select Switch
Push-Pull Pot as Master Volume
with a Master Tone (Passive)
FROM NECK PICKUP
FROM MMTW PICKUP
BATTERY
NEG (-)
- 9V +
OUTPUT
T
R
S
OUTPUT CABLE
RED
RED
RED
GROUND
BRIDGE P/U
NECK P/U
OUTPUT
MASTER
VOLUME
- 9V +
FROM MMTW PICKUP
FROM MMTW PICKUP FROM MMTW PICKUP