Fisher 1266-X User manual

1266-X & 1266-XB
Operating Manual
Deep Search Metal Detector
FISHER RESEARCH LABORATORY

CONTENTS
About Your 1266-X .................................................................pg. 1
Condensed Operating Instructions .....................................pg. 2
Setting Up................................................................................pg. 3
Control Housing ..................................................................... pg. 5
Discrimination Points ............................................................. pg. 6
Dual Discrimination............................................................... pg. 9
Searching ...............................................................................pg. 10
Pinpointing.............................................................................. pg. 12
Target Recovery ....................................................................pg. 13
Recovery Tools ...................................................................... pg. 14
Operating Tips........................................................................pg. 14
False Signals ........................................................................... pg. 16
Battery Replacement............................................................pg. 18
Battery Recharging ............................................................... pg. 18
Maintenance .........................................................................pg. 20
Treasure Hunter’s Code of Ethics ......................................... pg. 20
Where to Hunt in the U.S........................................................ pg. 21
Specifications ........................................................................pg. 22

ABOUT YOUR DETECTOR
1
The 1266-X was designed to excel in three ways: depth,
discrimination and simplicity. It offers a better combination of
these three characteristics than any other metal detector
we’ve ever built. And we’ve been building metal detectors
since 1931.
Depth. Engineered to go deep in mineralized soil at high levels
of discrimination. If you’re an experienced detector operator,
you’ll find yourself recovering good targets at depths you
never reached before. And you’ll really appreciate the loud,
clear audio response you get from those deep targets.
Discrimination. Detect all metals or ignore trash as you detect
valuable targets. Twin discrimination modes allow you to
switch instantly back and forth between any two levels of
discrimination. If you’ve found target ID meters confusing or
inaccurate, you’ll like this quick and simple way to help tell the
cash from the trash.
Simplicity. This is the kind of uncomplicated detector you
would expect from the company that pioneered automatic
turn-on-and-go metal detectors. No meter, no tuner, no
ground adjust. Just pick it up, set your controls once and start
searching. It’s light, balanced, comfortable and the open
center Spider coil makes pinpointing a snap.
Read this instruction manual from cover to cover and treat
your 1266-X as you would any expensive, high quality precision
instrument. Drop us a line if you have any questions,
comments, or exciting 1266-X stories. In the meantime...
Happy Hunting!
Fisher Research Laboratory

2
CONDENSED OPERATING INSTRUCTIONS
The 1266-X is basically a turn-on-and-go metal detector. It
doesn’t take an engineer to operate it but you’ll have more
fun and a better chance of making that BIG find if you have a
complete understanding of what you’re doing. That’s why we
strongly recommend that you read the entire manual. But if
you just can’t wait any longer and you’ve already used a
Fisher “X” detector, here’s some quick instructions to get you
going. 1. Set the controls as follows:
DISC 1 = 4 (small nail discrimination)
DISC 2 = 7 (Pull tab discrimination)
SENSITIVITY = Pull and turn 3/4 clockwise
OFF/VOL = Full clockwise1
2. As soon as you turn the detector on, it is
automatically tuned and ground adjusted in the
DISC 1 search mode.
3. DISC 1 and DISC 2 are motion modes. The
search coil must be at least slightly in motion to
detect a target.
4. When you locate a target, push and hold the
TRIGGER SWITCH for further target identification in
DISC 2. If your target still sounds good, dig it.
5. With practice, you should be able to pinpoint in
either of the DISC modes by moving the coil
slowly backwards and forwards and left to right
and finally stopping over the area of the
strongest target response. The target should be
approximately centered beneath the search coil.
6. To use the Zero-Motion Pinpointing mode,
simply place the coil on the ground (away from
the target), pull and hold the trigger, lift the coil
about a half inch and bring it back over the
target area as you would in a DISC mode. The
differences being that you don’t have to keep
the coil in motion to get a response.
7. HAPPY HUNTING!
1. If you’re using headphones, reduce the volume of the headphones
to a comfortable level when passing the search coil over a large,
shallow target.

3
SETTING UP
Your 1266-X is just about ready to use. The only adjustment
required is the angle of the search coil and the length of the
stem. Take a look at Figure 1 and familiarize yourself with the
parts of the 1266-X before proceeding.
1. Unpack it carefully. You may want to save the
carton and inserts for future storage or shipment.
2. Depress the spring lock on the lower stem and
slip the lower stem into the upper stem. Connect
the search coil cable to the control housing.
3. The stem length is adjusted by loosening the
lock nut and allowing the spring lock to snap into
one of the holes in the upper stem.
4. The search coil angle is adjusted by loosening
the nylon wing nut on top of the search coil.
5. Adjust the stem length and the coil angle so
the search coil rests flat on the ground about 6
inches in front of, and slightly to the right of your
right foot (to the left of your left foot for left
handers). Your arm should be straight and
relaxed, the grip held loosely.
Padded Arm Rest
Battery End Cap
Battery Housing
Built-In Detector Stand
Upper Lock Nut
Search Coil Cable
Spring Lock
Lower Lock Nut
Wing Nut
Open-Center 8-inch Spider Coil
Foam Hand Grip
Control Housing
Search-Coil Cable Connector
and Battery Recharge Jack on
Rear of Housing Injection-Molded
Lower Stem
Upper Stem
Figure 1. Fisher M-Scope 1266-X.

4
SETTING UP
REMEMBER • THE LONGER THE SHAFT, THE MORE
YOU WILL HAVE TO BEND YOUR ELBOW AND THE
SOONER YOUR ARM WILL GET TIRED. THE 1266-X IS
BALANCED FOR COMFORTABLE SEARCHING IN A
TIGHT SEMICIRCLE AROUND THE FRONT OF THE
OPERATOR.
6. With the stem length properly adjusted, tighten
the lock nut and search coil wing nut. CAUTION:
Never use a pliers or anything other than your
hand to tighten the lock nut or wing nut.
7. Disconnect the search coil cable from the
control housing and wrap it around the stem. A
loose cable near the search coil may cause false
signals, but don’t wrap it so tight that it pulls
against the housing or the coil. Reconnect the
loop cable to the housing.
8. With the shaft length and coil angle properly
adjusted, you should be able to move into your
“search” position by leaning forward very slightly
raising your arm (still straight) until the search coil
is about 1 inch above the ground and 12 inches
in front of your foot. The search coil should be
parallel to the ground and may have to be
slightly readjusted at this point.
9. If the armrest is too wide or
too narrow, you may bend it
slightly inward or outward to
meet your exact requirements.
Figure 2.
Search Position

5
1. DISC 1: DISCRIMINATE 1 is the search mode.
The 1266-X automatically operates in DISC 1
unless the TRIGGER-SWITCH is pushed and held or
pulled and held. DISC 1 is a full range
discrimination mode. All types of metal are
detected at the zero level and most small pieces
of trash are rejected at the maximum level of ten.
2. DISC 2: DISCRIMINATE 2 is similar to DISC 1
except that it operates only when the TRIGGER
SWITCH is pushed and held. DISC 2 is used for
target identification and/or pinpointing.
3. STEREO HEADPHONE JACK: Accepts most
stereo and mono headphones with one-quarter
inch diameter plugs. When used, the speaker is
automatically disconnected. A headphone can
be very helpful when hunting in noisy areas or
detecting faint signals.
4. SENSITIVITY: This is a dual range, push-pull knob
that controls sensitivity to targets and soil
minerals. Pull and rotate clockwise for normal
operation in mineralized soil. Push and rotate
clockwise for even more sensitivity in
non-mineralized, non-conductive soil. It should
be noted that faint erratic circuit noise is audible
at the full clockwise position.
5. BATTERY CHECK: Fully charged batteries will
give a loud tone when this button is pushed.
Weak batteries will give a weak signal and dead
CONTROL HOUSING
1
23
4
5
6

or weak batteries will give no tone. Batteries do
not have to be replaced as long as you can hear
a tone. As a general rule, you’ll be able to
operate your 1266-X for an hour or two after the
tone goes silent.
6. OFF/VOL: Power on-off and volume control.
This control turns the power off at the full counter
clockwise position and adjusts volume to
maximum at full clockwise.
7. TRIGGER SWITCH: This spring loaded trigger has
three-positions:
1. Relaxed position: Maintains the 1266-X in the
DISC 1 search mode.
2. Forward position: When pushed and held,
the 1266-X automatically switches into the DISC
2 mode.
3. Rear position: When pulled and held the
1266-X automatically switches into the Zero-
Motion Pinpointing mode.
8. RECHARGE JACK: Located on the rear of the
control housing, this jack is to be used only with
the optional 1266-X recharge kit. Nicad batteries
may be recharged from a 110-volt wall outlet or
an auto cigarette lighter socket (12 volt,
negative ground) without removing the batteries
from the control housing.
6
By adjusting DISC 1 and DISC 2 you will be able to ignore (or
“reject”) small pieces of metallic trash and ground minerals
while detecting valuable targets. The lowest setting at which
an object is rejected is referred to as the object’s
“discrimination point”. Discrimination points are determined by
such factors as size, shape, depth, type of metal and ground
mineralization.
1. Scatter some sample targets such as coins, pull-
tabs and small pieces of foil on the ground 1 to 2
feet apart.
DISCRIMINATION POINTS
CONROL HOUSING

7
2. Pull the SENSITIVITY control out and turn full
clockwise. (Back it off slightly if circuit noise is too
loud or annoying in the full clockwise position.)
3. Turn the OFF/VOL control full clockwise. (If
you’re wearing headphones reduce the volume
to a comfortable level when the search coil is
over a large target).
4. Set DISC 1 and DISC 2 at zero.
5. Hold the search coil about 2 inches above and
parallel to the ground. Move it slowly over the
samples and note the sharp loud response as you
pass over each one. Keep in mind that DISC 1 and
DISC 2 are motion modes and respond only when
the search coil (or the target) is moving.
6. Increase DISC 1 to a setting of 3 and again pass
over the targets. Repeat this process at settings of
4,5,6 and so on to 10. You will note that as you
increase the level of discrimination, the 1266-X will
reject some targets and continue to respond to
DISCRIMINATION POINTS
Figure 3. Typical 1266-X audio responses over 1 inch deep targets
with search coil sweeping 1 to 2 inches above ground.

8
others. You have now determined the approximate
discrimination points for the rejected objects.
For example, the small nail discrimination point
may be 4 and the pull-tab discrimination point 6.
7. Push and hold the TRIGGER-SWITCH. The 1266-X is
now operating in the DISC 2 mode.
8. Repeat steps 5 and 6 and you will note that the
DISC 2 discrimination points are about the same as
DISC 1 discrimination points.
9. The actual discrimination points for different
targets may vary slightly from DISC 1 to DISC 2 and
from detector to detector. However,
discrimination points are determined mainly by
such factors as target size, shape, depth, type of
metal and ground mineralization.
10. Some objects such as shallow bottle caps, bent
pull tabs or trash less than 2 inches from the coil
may be difficult to reject. The 1266-X will instead
respond with a strong broken signal, which will,
usually disappear if the search coil is raised slightly.
(The strong signal of a good target will just get
weaker when the coil is raised).
11. The 1266-X will remain silent when some objects
are rejected however other objects may “snap,
crackle and pop” as they are rejected. This is a
perfectly normal response indicating that the
powerful discrimination circuitry is doing its job.
12. Large pieces of trash such as beer cans or jar
lids may sound like good targets no matter what
you do. With a little practice however, you will be
able to tell the difference between a large target
and a small coin sized object.
13. The chart on page 7 shows some of the
different target responses you may expect at
different levels of discrimination. Note that as you
increase the discrimination level, you progressively
eliminate more targets including some good ones,
such as nickels and gold rings.
DISCRIMINATION POINTS

9
Take a look at the illustration above and note how the
discrimination level (as well as sweep speed and ground
mineralization) affects the search coil detection pattern. Not
only is depth reduced at high discrimination levels but also the
width of the pattern is reduced. This change in width has a
very important implication: if you’re searching at a high level
of discrimination you’ll have to sweep almost directly over a
target to get a response. The higher the degree of ground
mineralization, the more pronounced this effect.
This is where the 1266-X dual discrimination system comes in.
Set DISC 1 at a low level (like 2 or 3) and DISC 2 at a higher
level (6 or 7). As you search in DISC 1 you’ll have a better
chance of finding good targets. Of course, you’ll get more
trash too, so when you do get a response, switch over to DISC
2. If you still get a good response, dig it, keeping in mind that
had you been searching at a high level of discrimination you
may well have missed this one. This is the preferred method of
searching in relatively non-trashy soil.
In very trashy soil however it is generally easier to search
with DISC 1 at a high level of discrimination (at the pull-tab
discrimination point for example) and DISC 2 at a lower level
of discrimination (3 for example). In this manner a good target
4
12
3
Figure 4. Search coil detection
pattern and the effects of
sweep spread, discrimination
and ground mineralization.
Motion Mode.
1. Minimum Depth
a. Very slow or fast sweep speed.
b. Discrimination set at “10.”
2. Good Depth
a. Moderate sweep speed.
b. Discrimination set at “5.”
3. Maximum Depth
a. Moderate sweep speed.
b. Discrimination set at “0.”
4. Missed Target
Many targets within the range of
your 1225-X will not be
detected unless you closely overlap
your swings.
DUAL DISCRIMINATION

10
electrical interference caused by radio/TV
stations, power lines, etc. Turn your sensitivity up if
you want those deepest, smallest targets and
you’re willing to put up with some background
noise and more false signals. The maximum
sensitivity position is with the knob pushed in and
rotated full clockwise.
2. Decide how much discrimination you want to
use (see “DUAL DISCRIMINATION”).
3. Search slowly and systematically, sweeping in
a tight semicircle.
4. KEEP THE COIL PARALLEL TO, AND AS CLOSE TO
THE GROUND AS PRACTICAL (See Figeure 6). This is
Figure 5. Search pattern.
When the stem is properly
adjusted, the 1266-X is
balanced for sweeping in a
tight semicircle. Wide to the
right for right-handers. Wide to
the left for left-handers. Always
overlap your sweeps.
Good search techniques are every bit as important as
having a good metal detector.
1. Adjust your SENSITIVITY control. Only
experience will tell you how to set it in every
situation but start out in the ‘pull” position, turned
fully clockwise. As a general rule, turn your
sensitivity down to reduce excessive false signals
caused by mineralized ground “hot rocks” or
SEARCHING
may be detected in DISC 1 and pinpointed in DISC 2. (Lower
levels of discrimination produce stronger signals on deep or
small targets and it may be difficult to use the pinpoint mode if
there’s a lot of nearby trash.)
DUAL DISRCRIMINATION

11
Figure 6. Keep the search coil parallel
and as close to the ground at all times.
important for maximum coverage and depth. 4. If
you’re hunting on a lawn you can set the coil
right on the grass and search.
5. Take your time and overlap your sweeps by at
least 50%.
6. Search in a methodical manner. Pay close
attention to where you’re going and where
you’ve been.
7. Keep the search coil moving at a comfortable
rate. Remember that the 1266-X is a motion
detector and responds only when the search coil
(or the target) is moving while in the DISC modes.
8. TAKE YOUR TIME. Also very important. If you
walk too fast you can’t overlap your sweeps and
you’ll miss a lot of ground. If you sweep too fast,
you’ll lose sensitivity and miss the deepest targets.
9. The diagram on page 9 shows the search coil
detection pattern and how it is affected by
sweep speed, discrimination level and ground
mineralization while searching in DISC 1 or DISC 2.
Note that any one of the three, improper sweeps
speed, high discrimination or ground
mineralization will reduce your depth. All three
factors occurring at the same time will cost you
all but the shallowest of targets.
SEARCHING

12
ZERO MOTION PINPOINTING MODE
Target location is a snap using the Zero-Motion Pinpointing
mode. You do not have to keep the coil moving to get a
response in this mode.
1. Once the presence of a buried target is
indicated by the “beep-beep” of the 1266-X,
simply place the coil LIGHTLY on the ground,
away from the target area. Pull the TRIGGER-
SWITCH and hold. (At maximum sensitivity you
may hear a faint tone, which will disappear as
soon as the coil is raised. If the tone doesn’t
disappear, lower the sensitivity slightly.)
2. Raise the coil 1/2 half inch or so and move it
side to side across the target area a few times.
3. Stop the search coil over the center of the
response area.
4. Now move the coil slowly forward and back a
couple of times, again stopping in the center of
the response area.
5. Repeat one more time, moving the coil side to
side. Your target should be directly below the
open center of the search coil.
6. For quick and accurate pinpointing of strong
signals, place the coil on the ground very close
to the approximate target area and pull and hold
the trigger switch. You have now “tuned-out”
most of the target so you will only receive a
response directly over or very nearly over the
target.
PINPOINTING IN THE MOTION DISK MODES
Pinpointing in either DISC 1 or DISC 2 will take a little practice
but you may find that for most targets, it’s even quicker than
the Zero-Motion Pinpointing mode. Simply use the same
procedure as in steps 2 through 5 above. The only difference
will be that when you stop the coil over the target, you will
PINPOINTING

13
TARGET RECOVERY
Once you have pinpointed a target, your objective is to
recover it quickly and neatly, leaving virtually no trace of your
excavation. There are almost as many ways to do this, as there
are Treasure Hunters. Whatever works for you is good enough
as long as you don’t break any laws, damage vegetation, or
leave your search area looking like a World War II battlefield.
Generally speaking, beachcombers do little if any damage
to the environment while recovering targets. However, if you
plan to use your 1266-X on lawns or in parks, your target
recovery method can be very important. Two of the most
successful methods are illustrated in a separate booklet
enclosed with your 1266-X.
WHICHEVER TOOL OR METHOD YOU CHOOSE, REMEMBER THAT
RESPONSIBLE TREASURE HUNTERS TAKE PRIDE IN THEIR ABILITY TO
LEAVE SOIL AND VEGETATION INTACT AND UNDAMAGED.
PINPOINTING
lose the audio signal. You MUST keep the coil moving at least
slightly to determine the location of the strongest signal before
you stop it.
1. For very strong signals, you may improve your
DISC mode pinpointing accuracy by, adding one
or more of the following steps.
a. Lift the coil until the signal is just barely heard.
b. Reduce the sensitivity level.
c. Increase the discrimination level.
d. Rest the coil on the ground and move it
back and forth very slowly.
2. For very weak signals try the following:
a. Move the coil closer to the ground.
b. Increase the sensitivity level.
c. Decrease the discrimination level.
d. Speed up the sweep rate slightly.

14
OPERATING TIPS
1. We’ve already said it but it bears repeating:
TAKE YOUR TIME AND OVERLAP YOUR SWEEPS.
2. Keep your discrimination levels set low. You’ll
dig more trash but you’ll find more good targets,
too. If you continually run at the pull-tab
discrimination level you’ll find coins and silver
rings but very few gold rings for example.
3. Use a good headphone. You won’t miss faint
targets, you won’t attract unwanted attention
and you won’t bother others.
4. Practice pinpointing. There’s nothing sacred
about the methods described in this manual.
Many 1266-X users have developed their own
pinpointing methods.
5. Always bury a coin when working in unfamiliar
territory and check it at different discrimination
and sensitivity levels. There is some sensitivity loss
at higher levels of discrimination. The greater the
RECOVERY TOOLS
1. A heavy duty, blunt screwdriver is commonly
used by expert Treasure Hunters and the tool of
choice for cut lawns.
2. A sturdy hunting knife with a 5-inch blade will
do the job in most other soils. A high quality
double-edged “survival” knife is even better
(and more expensive) choice since it will be
almost impossible to bend or break.
CAUTION: Using a jack knife without a locking
blade is a good way to lose a finger!
3. A narrow garden trowel will work in loose or
wet soil.
4. Several excellent digging tools are made just
for the Treasure Hunter and especially designed
sand scoops are available for beachcombing.
5. A thin, dull probe is the preferred tool for
precise target location.

15
ground mineralization, the higher the sensitivity
loss. For example, you may be able to detect a
penny 6 inches deep at zero discrimination, but
no deeper than 4 inches at the pull tab
discrimination point. Also, ground mineralization
can reduce a detector’s ability to discriminate
accurately. In highly mineralized soil, some trash
targets may not be rejected.
6. If a target gives a good strong response in the
search mode but no response in the Zero-Motion
Pinpoint mode, you may have “tuned-out” your
target (and all others) by pulling the TRIGGER-
SWITCH over another piece of metal. If you
suspect this may be the case, check the ground
first in DISC 1 at zero discrimination to insure
there’s no buried metal before placing your coil
on the ground and pulling the TRIGGER-SWITCH to
go into the pinpoint mode.
7. In trashy areas, to reduce the “masking”
effects of trash on nearby good targets, use a
shorter and slower sweep pattern. Also, the
optional smaller 5-inch search coils will zero in on
good targets closer to trash.
8. When in doubt about the possible identity of a
target, dig it up.
9. The 1266-X is an easy detector to use but if
you’re having trouble with any aspect of its
operation (pinpointing, searching, false signals,
etc.) go back and reread the part of this manual
relating to your problem.
OPERATING TIPS

16
FALSE SIGNALS
Due to the extreme sensitivity of the 1266-X, you’re bound to
get some “false signals” once in awhile. A false signal occurs
when something that shouldn’t sounds like a good target. The
1266-X does a good job of rejecting junk but it is so sensitive
that “hot” mineralized spots in the soil, large, can fool it pieces
of junk, some kinds of bottle caps and pull tabs or trash less
than 2 inches from the coil.
So what do you do about false signals? Well, 90 percent of
them will sound suspicious to you after you’ve had some
experience and you’ll just ignore them.
They may be very faint or very abrupt with static. Often
when you go back over the same spot, a false signal will
simply disappear. Other false signals may be very loud and
sharp but most of these will also disappear if the coil is
speeded up or raised slightly. Some shallow, large or irregular
pieces of junk however, will sound off no matter what you do.
You may reduce the number of false signals by increasing the
discrimination level and/or reducing the sensitivity. Some other
sources of false signals are:
1. ELECTRICAL INTERFERENCE: Caused by radio/TV
stations,powerlines, nearby detectorsoperating at
thesamefrequency.SOLUTIONS:Movefurtheraway,
lower the sensitivity, and reduce sweep speed.
2. HIGHLY MINERALIZED SOIL: Usually causes
constant static or good target sounds. SOLUTIONS:
Make sure you’re in the normal “Pull” sensitivity
control position. Lower the sensitivity, increase the
discrimination, raise the search coil until false
signals disappear and sweep at that height.
3. WET SAND: Same as highly mineralized soil.
4. ELONGATED FERROUS OBJECTS: If you hear two
beeps very close together and can’t find either
one, you’re probably over a nail or some other
long iron object. But a very shallow coin or a
buried coin on edge may give the same
response. In all cases, the target will be between

17
the beeps or, if you sweep at right angles to your
original direction, you’ll receive a single beep
directly over the target (except for the very
shallow coin). One way to tell the difference
between a coin and a nail is to set your
discrimination at about 5. Most small nails will be
tuned out while most coins will respond with a
good, smooth signal.
5. EXTREMELY TRASHY SOIL: May result in a
constant chatter or “snap, crackle and pop” with
assorted, hard to find “good signals”. The obvious
solution is to increase the discrimination level to
maximum. Slow down your sweep speed and
shorten your sweep pattern. An even better
solution is to try one of the optional 3-3/4" or 5" coils.
You’ll be able to zero in on good targets in the
midst of junk.
6. DIGGING TOOL: If you’re carrying a metal sand
scoop, digging knife, screwdriver or whatever,
hold it behind your back or keep it above your
waist. Your 1266-X is sensitive enough to sound off
each time you sweep the coil beneath it.
False signals may also occur in the Zero-Motion Pinpointing
mode. When in this mode, the 1266-X detects all metals so you
may pinpoint a piece of nearby junk instead of your good
target. The solution is simple: always recheck your target area
after recovering any target to insure that you haven’t missed
something. Or learn to pinpoint in the discrimination modes.
You may also receive false pinpointing signals in highly
mineralized soil. In this case, it is important to keep the coil
parallel to the ground and at least an inch above it.
FALSE SIGNALS

18
BATTERY RECHARGING
Rechargeable nicad batteries may take as many as 1,000
recharges, however they do have some limitations you should
be aware of:
1. Nicads will last only about half as long as
standard carbon-zinc batteries before
recharging is required.
2. Nicads may develop a “memory” if you give
them repeated “booster” charges. In other
words, if you charge your batteries over and
over again for only three hours at a time, the
BATTERY REPLACEMENT
1. Two drop-in battery packs are located in the
battery housing below the armrest. Each pack
contains four 1.5 volt AA batteries.
2. Remove the battery end cap by partially
unscrewing the knob on the battery end cap.
3. Remove the battery packs and replace the
batteries. Make sure the batteries are oriented
correctly as indicated by the polarity marks on
the inside of the packs.
4. Reinstall the battery packs, connector end first.
Note that the large split connector with the
spring behind it is the negative terminal and the
smaller terminal is the positive terminal. Both
should match up with the polarity markings on
the battery end cap. Another way to tell if the
packs are in correctly is by checking the position
of the rivets on the back end of the packs: the
rivets should always be facing in towards the
center of the battery housing.
5. Put the battery end cap back on and lock it in
place by tightening the knob, finger tight only.
NOTE: If either or both of the battery packs are installed
incorrectly, the 1266-X will simply not turn on. The instrument
will not be damaged.