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.
© 2010 Copyright EMG INC. All Rights Reserved.
PO BOX 4394
SANTA ROSA, CA
95402 USA
P [phone]
F [phone]
EMGPICKUPS.COM
0230-0146A
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) Only one 9-Volt battery is required to power the pickups (unless
otherwise recommended) and any accessories such as the SPC,
RPC, EXG, AB, PA-2, and Pi-2.
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) EMG Active Pickups have very little magnetism compared to
passive pickups. We recommend you adjust the pickups as
close to the strings as possible. Sustain and string movement
will not be inhibited by close adjustment.
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 C1 and C2 are active.
In Single-coil mode, coils C2 andC3 are active.
C1 C2
C3
.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

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
MMTW INSTRUCTIONS Page 2
Using the MMTW Push-Pull Switch
The Push-Pull Switch included with the EMG-MMTW allows you to choose between
two internal pickups of the EMG MMTW, single-coil and dual-coil. The Push-Pull Pot
has two separate 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 35-TW 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) A Master Volume for the Instrument or, the Pickup Volume control
Refer to Diagrams #3 and #4
The pot section (25K) 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 10-pin header and push the cables on and
install the shunts as needed onto the labeled headers H1 thru H5.
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 H3 and H5 sends the pickup signal
to the wiper of the 25K Pot, and the output of the 25K Pot is at Position H1.
For two pickup guitars, Diagram #4 allows you to use the 25K Pot independently
of the pickup output. By taking the output of the pickup from Position H4, the
Volume control is now available to use as a Master Volume with H1 and H2 being
the input and/or output of the Volume control. H1 and H2 Positions are
interchangeable.
Position H4, 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 H5.
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 5 pairs of pins. They are
listed on the PC Board as H1 through H5. By using the the connections
shown in Diagrams #3 through #6, you can choose any of the 4 options.
SHUNT ON (H5)
PICKUP OUTPUT (H4)
MASTER VOLUME
OUTPUT (H2)
MASTER VOLUME
INPUT (H1)
PICKUP OUTPUT (H1)
Diagram #4
PUSH / PULL POT USED AS
THE MASTER VOLUME CONTROL
(2 PICKUP GUITARS)
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
1
2
3
1
2
3
Diagram #3
PUSH / PULL POT USED AS
THE PICKUP VOLUME CONTROL
SHUNT ON (H5)
SHUNT ON (H3)
OR TO THE OUTPUT JACK IN SINGLE
PICKUP GUITARS WITH NO TONE
CONTROL
TO TONE CONTROL OR
SELECTION SWITCH (VIA B157 BUSS)

Diagram #8
One MMTW Pickup
One Master Volume Control
No Tone Control
MMTW INSTRUCTIONS Page 3
OUTPUT CABLE
OUTPUT
T
R
S
BATTERY
NEG (-)
RED
RED
BATTERY
BUSS
OUTPUT
T
R
S
BATTERY
NEG (-)
OUTPUT CABLE
MASTER
VOLUME
CONTROL
VOLUME
CONTROL
MASTER
TONE
(PASSIVE)
BATTERY
BUSS
Using the Pot Section as:
2) A Master Tone control for the instrument or, the Pickup Tone control
Refer to Diagrams #5 and #6
The pot section (25K) 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 10-pin header and push the cables on and
install the shunts as needed onto the labeled headers H1 thru H5.
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 H3 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 is at Position H1.
Diagram #6 uses the 25K Tone control independently of the pickup output.
By taking the output of the pickup from Position H4, the control is now
available to use as a Master Tone with H1 and H2 being the input and/or output
of the Tone control. H1 and H2 Positions are interchangeable.
Position H4, the output of the pickup, would typically go to a selection switch
or a pan-pot.
- 9V +
- 9V +
TO VOLUME CONTROL
SELECTION SWITCH OR...
Diagram #7
Insert the plug onto the 7 pin header
of the pickup as shown here.
Note the orientation arrow.
Diagram #6
PP POT USED AS A MASTER
TONE CONTROL
PICKUP OUTPUT H4
INPUT TO TONE CONTROL
H2
OUTPUT OF TONE CONTROL
H1 (ONLY IF NEEDED)
PICKUP OUTPUT TO
SELECTION SWITCH,
EMG ACCESSORY, OR...
Diagram #9
One MMTW Pickup
One Volume
One Tone
RED
RED
FROM 35-TW PICKUP
FROM MMTW PICKUP
Diagram #5
PP POT USED AS THE PICKUP
TONE CONTROL SHUNT ON H3
PICKUP OUTPUT H1

MMTW INSTRUCTIONS Page 4
Refer to Diagram #10 Above:
1) Install the Pickups and route the cables to the control cavity keeping
any excess cable under the pickup.
2) Choose an up/down option from Diagram #1 or #2 and plug the MMTW
Pickup cable onto the Push-Pull pot.
3) Route a coax cable from the Push-Pull Pot (H4) to the Pickup buss, Position 1.
Plug the pickup cable of the other EMG into Position 2 of the Pickup buss.
4) Plug a coax cable from Position 3 of the Pickup Buss to the Tone control.
Plug a coax cable from the Tone control to the Push-Pull Pot (H1)
5) Plug the output cable from the Push-Pull Pot (H2) to the output jack and push
the connectors onto the T, S, and R terminals of the jack as shown.
6) Plug the RED Wires of the pickups onto the V+ Supply Buss (RED Shroud)
with the RED wire of the battery clip.
7) Strip the insulation from the switch wires and Insert them into the GREEN
and BLACK Terminal Blocks and tighten the screws with a small screwdriver.
Refer to the B157 Pickup buss instructions enclosed.
8) Put the battery in the insulating foam piece provided and place it securely in
the control cavity.
We suggest that you plug in the instrument and test it before closing the
control cavity.
Refer to Diagram #11 Below:
1) Install the MMTW Pickups and route the cables to the control cavity keeping
any excess cable under the pickup.
2) Choose an up/down option from Diagram #1 or #2 and plug the MMTW Pickup
cables onto the push-pull switch sections.
3) Route a coax cable from each of the Push-Pull Pots (H1) to the Tone controls.
4) Plug a coax cable from the Bridge Tone to the Pickup Buss (Position 1)
Plug a coax cable from the Neck Tone to the Pickup Buss (Position 2)
5) Plug the output cable from the Pickup Buss (Position 3) to the output jack and
push the connectors onto the T, S, and R terminals of the jack as shown.
6) Plug the RED Wires of the pickups onto the V+ Supply Buss (RED Shroud)
with the RED wire of the battery clip.
7) Strip the insulation from the switch wires and Insert them into the GREEN
and BLACK Terminal Blocks and tighten the screws with a small screwdriver.
Refer to the B157 Pickup buss instructions enclosed.
8) Put the battery in the insulating foam piece provided and place it securely in
the control cavity.
We suggest that you plug in the instrument and test it before closing the
control cavity.
MASTER
TONE
(PASSIVE)
NECK TONE
BRIDGE TONE
Diagram #10
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 + OUTPUT
T
R
S
BATTERY
NEG (-)
Diagram #11
2 MMTW Pickups
2 Push-Pull Pots as Volume controls
(Volumes are independent)
2 Tones (Passive)
Toggle Style Switch
GROUND
BRIDGE P/U
NECK P/U
OUTPUT RED
RED
RED
OUTPUT CABLE
NECK
VOLUME
FROM MMTW PICKUP (NECK)
BRIDGE
VOLUME
FROM MMTW PICKUP (BRIDGE)