Pioneer SX-3800 manual I I I, vR2*€ @vnr

8 . 4 FL INDICATORCIRCUIT

FrequencyDisplayCircuit

oThe counter IC (PD5009) has been designedto match FM ceramic filter IF offset (caused by displacementof the central frequency) by com- bination of the inputs (of H or L level) applied to pin nos.3 & 4. The matching IF offset in the SX-3800 is determined according to the com- binations of connections and disconnections between the R 28 and R 28 resistors in the equalizer assembly(AWM-22?). Check that the combinations shown in the table below have

followed for the conesponding grades of FM ceramicfilters F1 - F3 (3 ranks- color coded).

FM ceramicfilter		PD5009		AVtM-227
{ F 1 - F 3	}	Pin no . 3	Pin no . 4	R 2 8 ( 2 . 2 n 1 8 2 9 ( 2 . 2 n )
R e d		L	H	Cut	Connect
Blue		H	H	Cut	Cut
Orange		H	L	Connect	Cut

H = 5 . 5 V , L : O V

If the SX-3800 frequency display reads 97.95MH2 or 98.05MH2 when a 9B.00MHz signal is applied to the receivet, adjust TCl so that the display reads98.00MH2 correctly.

If an accurate 9B.00MHz input signal source is not available, tune the receiver to the nearest known broadcasting station in the 98MHz re' gion, and check that the station'sfrequency is correctly displayed,adjustingTCl if necessary.

Output PowerIndicatorCalibration

1.Apply a l"kHz signal to the POWER AMP IN terminals.

2.Adjusi the level of this input signalso that the voltage on the output terminals(SPEAKERS)

read8.95V (AC).

3. Adjust VR1(L) and VR2(R) so that the out- put power indicator read L0 watts.

FL indicatorassembly

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Fig .8 - 5

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