Kenwood KAC819 free download

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POWER AMPLIFIER KAC-819 SERVICE MANUAL C 2001-1 PRINTED IN JAPAN B51-7691-00 (4) 3376 Heat sink (F01-1655-01) Accessory (W01-1515-05) Screw set (N99-1587-05) KAC-819 CIRCUIT DESCRIPTION SP P-CON Switching Circuit When the SP output from the head unit is connected to SP IN, the power can be switched ON/OFF based on the DC voltage of the SP output. However, As certain haed unit models output DC permanently or generate a click during switching OFF, it is required to provide the capability of previous P-CON switching. A circuit which can perform the switching without using a switch is described below. This circuit performs switching by inhibiting the operation of the S-P-CON circuit when a voltage is applied to the P-CON pin. Circuit operation description When the head unit is connected to SP-IN, the DC component in the SP output turns Q38 ON through D32 and R158. When a voltage is applied to the P-CON pin under this condition, Q45 is turned ON via R188, positive feedback is applied by combination of Q45 and Q46, Q45 and Q46 are held at ON, so the voltage at point (A) is almost 0V and the SP-P-CON circuit is not activated. This circuit holds the ON status while the DC voltage from SP is present. Therefore, in this condition, the P-CON circuit continues functioning. To cancel the functioning, the voltage at the SP-IN pin should go 0V. D29 to P-CON terminal 7.5V power control D32 from SP-P-CON R188 A R158 10u35 Q38 3.3K Q46 100K 4.7K Q45 ADJUSTMENT No. ITEM INPUT SETTINGS OUTPUT SETTINGS TUNER (RECEIVER) SETTINGS ALIGNMENT POINTS ALIGN FOR FIG. Connect a cassette receiver or other receiver. IDEL CURRENT Connect a DC voltmeter to CN3 After sufficient aging adjust to 2mV + 1 - Volume : 0 VR3 - 2 A B C D E F G H I J PC BOARD (Component side view) 1 PC BOARD (Foil side view) AUDIO UNIT (X09-5360-10) X09-5360-10 A/4 (J74-1030-21) Q14 Q13 D8 E W14 W4 AUDIO UNIT (X09-5360-10) X09-5360-10 A/4 (J74-1030-21) Q12 Q11 B TH1 E Q6 R77 B E B E Q13 D8 R102 B R88 R84 E Q14 B E D7 W16 C64 R110 R101 W15 W17 W20 R76 C40 VR3 W18 W19 W23 W26 R42 R46 2 R165 B E R164 R108 W32 R187 W28 W30 W33 R19 R81 R80 B E C63 R109 R163 W34 R162 W40 W46 W48 Q8 E B W45 W41 W47 W22 W25 R104 W27 C62 W29 W31 R106 R103 Q16 E B C61 R105 R83 R82 B E Q10 B E Q9 R37 R38 R49 R50 C21 R52 R44 R43 R32 R31 W37 R107 D19 D16 D15 D17 C42 Q7 E B D9 C48 R71 B E Q15 W44 R41 W39 W42 R47 W38 D13 D14 D11 W51 W52 W53 W54 W55 D20 D18 C47 C38 E B D4 W49 W50 R27 R10 R8 D12 R9 C6 D6 R72 Q4 D3 C12 R33 C14 Q5 B E R74 R79 R93 E B Q3 C39 R36 C15 R35 R34 W57 W58 R28 3 W62 W63 W65 W66 R40 D5 R70 W73 W76 R14 R15 C5 C1 R1 R5 R7 R2 R188 R6 W81 B E W80 C2 R184 W85 R194 Q44 E B W88 W90 R185 W87 4 E B Q37 W89 D32 W91 W93 W94 D34 W92 R160 B E R170 W96 R23 R22 R21 R24 D36 D35 W98 Q19 B E B E B E Q20 B E 5 R131 W201 Q17 Q18 W101 W102 D33 R142 R143 C58 R144 (X09-5360-10) Ref. No. Address IC1 3D IC2 2D IC3 5E IC4