Kenwood KAC-819 free download

File name KAC-819.pdf

POWER AMPLIFIER KAC-819 SERVICE MANUAL C 2001-1 PRINTED IN JAPAN B51-7691-00 (4) 3376 Heat sink (F01-1655-01) Accessory Screw set (W01-1515-05) (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 7.5V power control to P-CON terminal A D32 R158 Q38 from SP-P-CON 10u35 4.7K 3.3K + Q46 R188 100K