- ページ 6

マルチプレクサ Dynatuner FMX-3のPDF 組み立て説明書アライメント操作をオンラインで閲覧またはダウンロードできます。Dynatuner FMX-3 9 ページ。 Stereomatic multiplex integrator

ページを印刷する

•

be necessary to clear away some of the solder previously

applied. To make these connections, heat the lug and push

the wire through the terminilL Bc certain that when solder-

ing is called for, all of the wires are finnly soldered to the

terminal.

13 ( ) Connect one end each of two 6/1 green wires to lug

#1 of the three lug terminal strip. For convenience

of wire location, insert one wire from each side of

the lug. See the pictorial diagram. Solder all wires.

A total of 8 wires are connected to this lug.

14 ( ) Connect onc end each of two 6" black wires to lug

#2 of the three lug terminal strip. For convenience

of wire location, insert. one wire from each side of

the lug. Solder all wires. A total of 6 wires are con-

nected to this lug.

1.'5 ( ) Twist together the black and the green wire from

the front side of the lug terminal strip. Connect the

black wire to the center ground pin of socket. V71

(S). Connect the green wire to eyelet #74 (S). Posi-

tion the wires as shown in the pictorial.

16 ( ) Twist together the remaining black and green wires

from the lug terminal strip. Connect the black wire

to the center gwund pin of socket

(S). Connect

the green wire to eyelet #83 (S). Position the wires

as shown in the pictorial.

17 ( ) Connect one end of a 9" red wire to lug #4 of the

quadruple section filter capacitor. Solder all wires.

A total of 3 wires and one resistor lead are connected

to this lug. Connect the other end to eyelet #87 (S).

The wiring of your Multiplex Integrator is now com-

pleted.

is wise at this point to go back and check all

solder connections in the unit. One poor solder connection

can upset the performance of your unit. Check to· be sure

that the position of the wires in your unit agrees closely

with the pictorial diagram and the photographs. The pic-

torial diagram must necessarily be exaggerated for clarity,

but any discrepancies between it and the photographs are

of no consequence. Make sure you remove all loose pieces

of solder or wire.

Position the red-black and green-black pairs of leads from

the volume control to eyelets #80, #82, 1184 and #86 exactly as

shown in the pictorial diagram, around the V-71 socket and

away from T73. Keep them clear of the board. Insert the

tubes in their respective sockets on the PC-8 and

PC~12

boards, and install the tube shields. Make sure the ground

straps on the sockets slip between the shield and the tube.

Insert the EMM-801 tube in the V8M socket.

Now tum the tuner on and allow it to operate for one

half hour or more to allow the tubes to age and for operat-

ing conditions to stabilize. Assuming that your FM-l has

been aligned according to its instructions, you should be

able to enjoy the use of your tuner at this time, and nonnal

monophonic reception should be available at both output

jacks, using the lower beam of the dual-beam tuning eye

for tuning in the stations. The upper beam will be used as

a stereo indicator. A stereo program may have insufficient

separation pending complete alignment, but in other

respects should be satisfactorily received.

If the above conditions are not apparent, refer to the

sedion "In Case of Difficulty" before proceeding with

alignment of the FMX-3.

ALIGNMENT

The Dynatuner should have been aligned according to

the instructions in the manual for the FM-1 before you pro-

ceed with the alignment of the FMX-3. Correct alignment

of the tuner is especially important for proper stereo opera-

tion, and in particular, the discriminator mllst be accurately

aligned according

the instructions in the PM-I manual if

maximum noise rejection is

be realized.

is necessary to

remove the 6BL8 tube from the completed FMX-3, although

the 12AX7 (V72) must be in place when alignment of the

tuner only is carried out. The lower beam of the new dual

beam tuning eye is used in the same way as the EM84 in the

alignment procedures described in the FM-l Dynatuner

manual.

The alignment procedure for your multiplex integrator

is as simple and precise as the alignment procedure for

your Dynatuner. It involves only the peaking of the tuned

circuits for the proper reinsertion of the stereo sub-carrier.

The transformers of the FMX-3 integrator have been presd

close to the proper alignment point. The accuracy with

which the alignment procedure is performed will determine

the stereo separation capability of the tuner, hut due to

variations in the broadcast material, the same degree of

separation will not always be apparent.

The only tool required for alignment is the plastic tool

supplied with your Dynatuner. Only this type of tool

should be used for adjusting the transformers. When using

this tool, all adjustments should be made using the end

which has a shoulder to prevent inserting the tool too far.

CAREFUL IN

HANDLING

THE

CHASSIS

DURING ALIGNMENT. THERE IS SOME SHOCK

HAZARD DUE TO THE EXPOSED WIRING. If you

are careful, it is possible to unsolder and resolder the

required wires in the following steps without turning off

the tuner. However, if you wish to avoid all risk of shock,

you can turn the tuner off, make the connections, and t.um

it on again. It is essential that you give the set a few

minutes to warm up thoroughly after any time that you

tum it off., even if the off time is only a minute or less.

is suggested that you read these instructions over

completely before proceeding to completely familiarize

yourself with the alignment procedure.

the 6BL8 has

been removed, it and its shield must be reinstalled. The

tuner is to be connected to an antenna, turned on, and

precisely tuned to a known stereo broadcast. The connec-

tion of an amplifier and speaker is not required.

The lower beam of the EMM-801 eye indicates proper

tuning of either mono or stereo. It is designed so

that

does not overlap, but maximum closure indicates the point

of correct tuning.

The upper beam of the eye is the

S'TEREOCATOll.

will

close completely (after alignment) in the presence of the

H:lKC pilot signal which is an integral part of a stereo

broadcast. It will be fully open when a monophonic broad-

cast is correctly tuned, and, depending on ambient noise

conditions, it may flicker between stations.

1 ( ) Temporarily solder one end of the 1.2 megohm

(brown-red-green) resistor R94 to the center ground

pin of V71 (S). Temporarily solder the other end to

eyelet #75 (S). This is one test point, TP. Using

the shoulder end of the plastic alignment tool, adjust

transfonners T71 and T72 for maximum closure of

the upper beam of the eye. Adjust first one trans-

former, and then the other, and repeat. The purpose

of the resistor is to reduce the closure of the eye for

easiest adjustment. Usually only a very small adjust-

ment is necessary to reach the right point.

2( ) Remove the 1.2 megohm resistor from eyelet #75,

and temporarily solder it to eyelet #88 (S). This is

the other test point, TP.