Dynatuner FMX-3 Інструкція для операції вирівнювання збірки - Сторінка 5

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Assembly 01 the PC·

2 Circuit Board

Note that the top of the dched circuit board indicates

the location of each component. The identification symbol

for each part is marked between the holes into which its

leads will be inserted.

It is important that all components be mounted close to

the board. Flow solder from the lead onto the board so that

no ball of solder is evident, but rather a smooth transition

from solder to component lead, and to the board. The

solder must completely surround the lead. Do not apply

excessive solder, but do not hesitate to apply sufficient heat

to assure a smooth flow of solder all around the lead and

onto the board. Be sure that all the eyelets are soldered

to the copper on the board, as well as to the lead. Cut off

all leads close to the bottom of the board after soldering.

1 ( ) Insert all of the resistors R71 through R93 in their

places on the board. Solder all leads and cut off the

excess.

2 ( ) Insert all of the capacitors C71 through C84 in their

places on the board. The direction in which these

capacitors face is not important. Solder all leads.

3 ( ) Mount the two 9-pin sockets V71 and V72. Note the

orientation of the flat side of each socket. Ground

straps have been installed in the sockets. Be sure

each pin penetrates the board and does not bend over

on top of the board. Seat each socket firmly to the

board and then solder each pin, the ground straps,

and the center ground pin.

Mount the choke L71. Solder each lead and cut off

the excess.

vide a "heat sink" when these are soldered in place.

When soldering them, grasp the loop with a pair of

pliers from the top of the board, and solder from the

bottom of the board. This technique prevents damag-

ing the relatively delicate diodes with excessive heat.

final Assembly

1 ( ) Install the completed PC-12 board on top of the

tuner chassis in place of the multiplex adaptor cover

plate, using the four sets of #4 hardware. Follow the

orientation in the pictorial diagram.

2 ( ) Twist together the

8/1

black wire (the longer of the

two black wires) from lug #4 of the volume control,

and the green wire from lug # 5 of the control. Con-

nect the black wire to eyelet #82 (S). Connect the

green wire to eyelet #80 (S).

3 ( ) Twist together the following three wires: the remain-

ing black wire from lug

of the volume control, the

red wire from lug #3 of the control, and the green

wire from lug #6 of the control. Connect the black

wire to eyelet #77

(8).

Connect the red wire to eye-

let 1176 (S). Connect the green wire to eyelet

#78 (S).

4 ( ) Twist together the remaining black wire from lug #1

of the volume control and the red wire from lug #2

of the volume control. Connect the black wire to

eyelet #84 (S). Connect the red wire to eyelet

#86

(S).

5 ( ) Connect one end of a 1

%/1

red wire to eyelet #36 on

the bottom of PC-8

(8).

Connect the other end to

eyelet #38 (S).

•

6( )

Mount transformer '1'73 (432004). Note that this

transformer can only be mounted one way. Seat it

firmly, so that it snaps into position, and make cer-

tain that all 5 connecting lugs, as well as the two

mounting tabs, penetrate the board. Solder all seven

lugs.

7 ( ) Mount PEC-l and PEC-2 (555001). Note that these

identical units face in opposite directions. Solder all

6 leads and cut off the excess.

8 ( ) Observing detail B, mount each of the four diodes

D71 through D74. Those supplied may look like

either of those in the illustration, and will have one end

painted red, or marked with three stripes. (Disregard

single green dot..,> or stripes.) DI-

ODE POLARITY IS IMPOR-

either

TANT. The arrowhead on PC-12

board points to the marked end of

- ' --, -

the diode. Diodes should be soldered

carefully without excessive heat,

using the following technique: The

leads should be bent up, and then

down in the manner shown to pro-

DETAIL"B"

Mount the transformers T7l and '1'72 (432003). Be

careful to orient these correctly. Make certain that

the pin with the green dot is inserted in the hole

nearest to the heavy dash on the board. These trans-

formers must be seated firmly against the board, and

the two mounting tabs should snap into place. Solder

all 6 lugs (4 connecting lugs and 2 mounting tabs)

on each transformer.

6 ( ) Observe the red and the green wires protruding

through the slot in the front of the chassis. Feed the

red wire through grommet #2 (in line with the slot)

and connect it to eyelet #79 on PC-12 (S).

7 ( ) Feed the green wire through grommet #2 and con-

nect it to eyelet #75 (S). This wire may appear long,

but the extra length is used in the alignment pro-

cedure.

8 ( ) Unsolder the two wires from output socket A on the

back panel. Connect the free end of the short wire

(the wire connected

output socket B) to eyelet

#85 (S).

9 ( ) Cut off 5112" from the green wire just unsoldered

from output socket A (the wire connected to eyelet

#39 on PC-8). Strip the insulation back

on the

free end, and connect it to eyelet #71 (S).

10 ( ) Connect one end of a

6112/1

black wire to eyelet #40

of PC-8 (S). Be sure that the solder flows from the

lead, to the eyelet, and onto the copper on the board.

Connect the other end of this wire to eyelet #73 (S).

11 (

Connect one end of a 6" green wire to eyelet #33 of

PC-8 (S). Connect the other end to eyelet #72 (S).

12 (

Connect one end of a

2/1

green wire to the long

(center) lug of output socket A (8). Connect the

other end to eyelet #81 (S).

The remaining steps will require connections to lugs pre-

viously soldered in the construction of the FM-l (unless

you are building the FM-l and FMX-3 at the same time,

in which case solder will not have been applied). It may