Teleton TFS-70 Service Manual page 2

(b) Set S.G. to 465 KHz (Mod. 3000 Hz 30%), and adjust
cores of T401 and 1402 for maximum output reading.
3. AM Tracking Adjustment (Adjusting procedure for LW, MW,
and SW)
3-1 Measuring Equipments
(a) AM Standard S.G. (including loop antenna)
(b) Output Meter (V.T.V.M.)
(c) Oscilloscope
(d) Dummy Load 82 50W
3-2 Preparation of Adjustment
(a) Volume: Max., Mode: LW, Others: Same as procedure 1-2
(b) Measuring connection is as follows:
SP 8 ohm
"Wf Oscilloscope
Ho 47. a a
Mad. 400Hz30%
_SP. OUT 2 ee
Dummy Load
8 ohm
Figure 4
Figure 5
(c) TC301, TC302, TC304, TC305 and TC306 Position are
as shown in Figure 5.
(d) Set the Aluminium ring of LOO1 (Ant. coil) as shown
in Figure 2.
(e) Set LOO2 (Ant. coil) as shown in Figure 2.
(f) Set LOO3 (Ant. coil) as shown in Figure 2.
Note: All adjustments for max. Output.
33 LW Tracking Adjustment
3-3-1 Adjustment of Local Osc. circuit
a
145 KHz
Adjustment Step 2
350 KHz
Frequency (S.G.)
V.C. Position Max. Capacitance
Min. Capacitance
Adjust Point |
Repeat Step 1 and 2 several times. When step 1 and 2 match,
adjustment of the Local Osc. Circuit is finished.
3-3-2 Adjustment of Tuning Circuit
Adjustment Step 1
= ;
Frequency (S.G.) 160 KHz 320 KHz
V.C. Position 160 KHz Tuning 320 KHz Tuning
Position Position
Adjust Position Aluminium Ring TC301
Repeat step 1 and 2 several times. When step 1 and 2 match,
adjustment of tuning circuit is finished. Fix the Aluminium
ring with wax, and adjust finely the Local Osc. Circuit (because
the coverage drag by the Tracking adjustment.)
3-4 MW Tracking Adjustment (Mode: MW)
3-4-1 Adjustment of Local Osc. Circuit
1 2
515 KHz 1710 KHz
Max. Capacitance {| Min. Capacitance
T302 TC304
3-4-2 Adjustment of Tuning Circuit
Adjustment Step
Frequency
V.C. Position
Adjust Position
1
600 KHz
Adjustment Step
Frequency | 1400 KHz
V.C. Position 600 KHz Tuning
Position
L002
1400 KHz Tuning
Position
TC303
Adjust Position
3-5 SW Tracking Adjustment (Mode: SW)
3-5-1 Adjustment of Local Osc. Circuit
Adjustment Step 1
5.8 MHz
Frequency (S.G.)
V.C. Position
Max. Capacitance
T303 Adjust Position
3-5-2 Adjustment of Tuning Circuit
1 2
7 MHz 11 MHz
Adjustment Step
Frequency (S.G.)
V.C. Position 7 MHz Tuning 11 MHz Tuning
Position Position
Adjust Position LOO3 TC305
>
FM, IF Adjustment (FM, IF Adjustment is adjusted with
S Curve.)
4-1 Measuring Equipment
(a) 10.7 MHz Interscope (Sweep generator and scope)
4-2 Preparation of Adjustment
(a) Mode-FM, Others ----- same as procedure 1-2
(b) Measuring connection is as follows:
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oe
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Die Nhe ade
aa OUTPUT LEAD
Figure 6
1. Keep output lead and input lead at a distance.
2. Ground of the output & input lead should be done
near point of hot side.
4-3 Adjustment
(a) In condition of Figure 6, adjust vertical gain (80 dB
ATT.) for approx. 1/3 height output wave form.
Output wave form on the Interscope is as shown in
Figure 7.
Met ttt
|
TO.7MHz Marker
Figure 7
(b) Adjust black core and red core of T201 to obtain the
wave form as shown in Figure 8.
> .. 'Max. Point
ior LA
Noise
Min. Point 77 * 10.7MHz Marker
Figure 8
Note: See Figure 9.
Figure 9