LG GoldStar TSR-580 Service Manual page 10

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Note 1.: Adjust T4, T5 and T6 to get maximum gain and symmetry in IF response as shown in Fig. 5.
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IF response for weak input signal IF response for strong input signal
After adjust IF response for weak input signal, supply strong input signal and also adjust T4, T5 and T6 to makepart
(a) flat as shown in Fig. 6.
Note 2.: Adjust output of sweep
generator so that noise appears
on |F-curve as shown in Fig. 7 below and adjust
T1 and T2 for maximum indication. |
Note 3.:
Adjust T3 to be |F-curve into S-curve (See Fig. 8) and adjust T3 so that declined part of S-curve has to be
just linear.
If ceramic filter is used in RF part, adjust T3 so that part (A) and part (B) are symmetrical on either side of vertical
line, because the marker of 10.7MHz on sweep generator is not on the center of S-curve.
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Rg: FM SSG Output
Ri: 75-9
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