Teleton TFS-70 Service Manual

Tel. Chelmsford 62 442 TX 99 338
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Technical Service Organization
Waterhouse Lane, Chelmsford, Essex.
:
Tel. 0245-54621
TX 99338
2200 Borgerhout Belgium
MODEL
TFS-
70
Prins-Leopold-Straat
28
Tel. 03/361045 TxX32508
03/357670
Switzerland: TRANSACO AG
Kanzleistrasse 126 8004 Zurich
Tel. 39 45 60/23 50 40 TX 52 3262
When transistors Q711, 712, 713, 714 are exchanged, the
following adjustment is necessary:
1-1 Measuring Equipment
(a) Current Meter
1-2 Condition of the Set
e: P ine is 2
Upper Cabinet ay Ping Boat a: ee
Punetung Koad Bx4 | (p= —,
( d B x f Bove oN
a a Secs
(a) Treble... ......02. Middle Position
(i) Bass 2.4) oo dat Sore Snes Middle Position
(c) Volume .......... Minimum
(d)Balance .......... Middle Position
(e) Muting, AFC, Loudness, Tape, Low, High ........
Stopper Plate Crd OFF Position
(f) ST/MONO......... ST
vere
te
ee
(g) Mode ............
AUX
(ak Cabin - (h) Speaker... 2.0.00... A
A QUA 6 oc ea Gee ade: 3 ST
=
1-3 Adjustment
Stepner
(a) Adjust VR701, VR702 to middle position.
Diseases
= :
(b) Connect the Current Meter
@ Side to Terminal 3(Rch.)
Pater
ee
oo e e
or 4(Lch.) on the Fuse Board A, and the Current Meter
oe ae
c
© Side to Terminal 1(R ch) or 2(L ch).
(c) Adjust VR702 to 40 mA £3 mA.
<i aa (dj Set the Current Meter to L Channel.
pee (e) Adjust VR701 to 40 mA +3 mA.
Figure 1 (f) Repeat Procedure a - d several times.
CABINET
REMOVAL
2, AM IF Adjustment
; :
2-1 Measuring
Equipments
Remove six screws on the cabinet sides.
,
(a) AM Standard Signal Generator
Remove two screws on the cabinet rear.
Pull backward the upper cabinet, then this will be removed. (b) Audio Oscillator
ADJUSTMENT INSTRUCTIONS 2-2 Preparation of Adjustment
(a) Volume: Max., Mode: MW, Others: same as procedure 1-2
(b) Measuring Connection is as follows:
FwWN >
Audio-Osc.
(3kHz) Out s
AM _IF Board Terminal
Standard sa, Soe!
Signal Generator : Dummy toad Oscilloscope
EXT 10K 9.01
O QO
@ w—tt
> a
Figure 3
2-3 Adjustment
(a) Set S.G. to 465 KHz (Mod. 400 Hz 30%) 80 dB, and
adjust IF cores of T401, T402, T403 and T404 for maxi-
mum output reading.
Adjust the Attennator of S.G. according to increase the
Output, and put the output reading to 500 mW (2¥V)
Figure 2 appro