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3 ( ) Unsolder the green wil'e connected to eyelet #75 and

temporarily solder it to eyelet #88 (S).

4 (

Adjust the top slug of 1'73 for maximum closure of

the upper beam of the eye.

5 ( ) Adjust the bottom slug of 1'73 for maximum closure

of the upper beam of the eye.

Repeat step #4.

7 (

Repeat step #5.

8 (

Remove the 1.2 megohm resistor. This can be saved

for future use when realignment is desired.

9 (

Unsolder the green wire from eyelet #88 and resolder

it to eyelet #75 (S).

This completes alignment of your Dynatuner Multiplex

Integrator. If the brass front plate is being installed for

the first time, its protective plastic film must be peeled off

and it is wise to cut threads in the holes above and below

the tuning capacitor shaft with the two small brass plated

self tapping screws by inserting and removing them. This

will avoid scratching the brass by enabling much easier

insertion when the front plate is installed. Remove the

%))

nut holding the volume control to the front panel. Insert

the rectangular plastic insert which is included in the

FMX-3 kit, into the front plate cutout from the rear (the

top edge is narrower than the bottom). Place the front

plate against the steel front panel so that the plastic

insert is held between the two plates, and the volume con-

h'ol shaft and the tuning capacitor shaft protrude through

both panels. Install the

nut on the volume control

shaft and tighten it. Secure the front plate to the panel

with the two brass self-tapping screws above and below the

tuning shaft. Rotate the volume control shaft fully counter-

clockwise and install the small knob with the pointer at the

7 o'clock position. The knob is pushed onto the knurled

shaft. Fasten the large knob onto the tuning capacitor shaft

by tightening the set screw. Install the rubber feet in the

corner holes of the bottom plate, and secure the bottom

plate and the cover with the four sheet metal screws. The

flange on the front of the cover goes between the steel

front panel and the brass front plate.

Your Multiplex Dynatuner is now ready for long pleas-

ureable use.

IN CASE OF DIFFICULTY

Your FM-l Dynatuner manual has some trouble shooting

suggestions (page 13) which are applicable to the complete

stereo tuner. In addition, it is frequently possible to locate

difficulties by using the voltage table in this manual. A

vacuum tube voltmeter is required. Departures of more than

20% from the indicated values (except for voltages

marked ,:,) indicate a possible error or component failure.

Some understanding of the FMX-3 circuitry will assist

in troubleshooting. Review the circuit description at the

beginning of this manual. In addition, the STEREOCATOR

(upper beam of the EMM-801) will aid in locating the

difficulty. The STEREOCA1'OR is operated by the 19KC

amplifier and doubler circuit (1'71, Tn, V71). Remember

thai in most cases, if the EMM-801 socket has been correctly

wired, improper indication by the STEREOCATOR is an

effect, rather than a cause.

If the STEREOCATOR remains closed on both mono and

sicrc>o stations, the 19KC amplifier is oscillating. A rough

check of the STEREOCATOR is to disconnect the green

wire from eyelet #75 and touch the free end with the finger,

which should illuminate the word STEREO.

the STEREOCATOR passes this test, but does not

deflect on a known stereo broadcast, check the 6BL8, and

also check the continuity of 1'71 and Tn with an ohmmeter.

The resistance of each transformer pin to ground is approx-

imately as follows: #1 pin-On, #2 pin-40n, 113 pin-IOn.

#4 pin-100ft The #1 pin is identified on the board by a

white mark (green dot on the can) and the pins are num-

bered clockwise when looking at the bo/.tom of the board.

the STEREOCATOR is operating correctly, but there

is little or no separation on a known stereo broadcast, make

certain that the fault does not lie in the broadcast. Program

material or transmission deficiencies are common causes of

such complaints where stereo programming is relatively

new. Separation may also be adversely affected by "multi-

path distortion"--reflections of the signal by buildings, hilly

terrain, etc., which cause effects similar to television

"ghosts," often accompanied by distortion of the audio sig-

nal. Multipath effects can be reduced only by improving the

antenna system-relocation, reorientation, or replacement

with a more directional antenna.

If it has been determined that poor separation is caused

by the FMX-3, and the STEREOCATOR operates nor-

mally, the T73 transformer may be incorrectly aligned,

although 1'71 and 1'72 should also be checked. Incorrect

alignment can also cause channel reversal. Normally, the

A output jack is the left channel.

A diode which is faulty, or one which is installed incor-

rectly may also reduce the separation, but this will usually

be accompanjed by a significant reduction in output on the

affected channel.

If the 6BL8 tube is removed, there will be no separation,

and the STEREOCATOR will not light, but monophonic

transmissions will still be normally received with equal out-

put from the A and B output jacks.

these signals are un-

balanced, or if one channel is distorted, the difficulty is in

the diode bridge or in the V72 circuit.

If the stereo alignment procedure can be carried out with

eye deflection at both alignment points, it is probable that

the 19KC and doubler sections are functioning properly. If

there is no audio signal when there is deflection of the upper

beam of the EMM-80l when tuned to a stereo broadcast,

then the signal path should be checked from eyelets #33 and

#39 through choke L71, to 1'73, through the diode bridge to

the dual volume control and to pins #2 and #7 of

vn.

Touch-

ing the circuit at any of these points should produce a pop or

hum through the system. If not, something in this path is

malfunctioning.

FACTORY SERVICE AND GUARANTEE

It is recommended that the entire Dynatuner with

FMX-3 installed be returned to the factory for service

should service be required. Rpmoval of the FMX-3 for serv-

icing is generally not practical since its performance is

interrelated with that of the Dynatuner, and both should

be examined as an entity.

Please refer to the FM-l manual for factory warranty

and service on the FM-l. This section is applicable to the

FMX-3 without additional charge for service of the multi-

plex portions of the circuitry.

Dyna Company assumes no responsibility or liability

for damages or injuries sustained in assembly or operation

of the FM-l and/or FMX-3.