Tandberg Huldra 8 MPX Service Manual

Page 1

PRDID

Installation instructions for

Stereo-multiplex decoder - model 3
in Huldra 8

TANDBERGS RADIOFABRIKKA/s

Page 2

lntructions for installing Decoder 3 in Huldra 8

The figures below show the IF board in Huldra 8 with
serial no. lower than 427200. In receivers having
higher serial number, capacitors 0238 and C242 are
located on the component side of the board. Further- 5.
more, blue and black wires to the switch section are
connected. 6,
Steps 6 and 7 in the installation procedure below can

be omitted for higher serial numbers.

1. Connect a 51k/1W resistor in parallel with R232
on the prim side of the IF board.

2. Remove C231 (0,1 ,LF) from the component side 8.
and solder it to the same terminals on the print
side.

3. Remove R230 and R231. 9.

4. Drill the holes intended for decoder by means of a
1,5 mm drill (1/16) and install an edge connector
(Carr Fastener). Observe that the connector must

be oriented so as to give the greatest distance
between the decoder board and FM detector
shielding can.

Cut excessive wire ends on the print side in order
to avoid short-circuiting to the can.

The two wires (black and blue) should be twisted
and soldered to the switch section and the IF bo»
ard as shown in fig. 2.

. Connect 0238 and 0242 (16 MF, 25 V) to the IF

board, and C12 (1 MF, 40 V) to the switch section
as shown in fig. 2.

Plug the decoder into the connector on the IF
board. The print side should face the FM detector
can.

Check that the IF circuits are optimally aligned.

. Check the decoder operation as outlined on top of

page 4 or perform the complete alignment descri-
bed in the table, page 4.

c235 an

52300

FM
DETECTOR

Fig. 1. The IF board seen from the component side.

353
i

PHONO

TAPE MONO

W

m

%@

2

+

OFF

Fig. 2. The IF board seen from the printed side.