Sony STR-K790 Service Manual - Page 1

SERVICE MANUAL Ver. 1.1 2007.03 STR-K790 US Model Canadian Model AEP Model UK Model • STR-K790 is the tuner and the amplifier section in HT-DDW790 and HT-DDW795. This receiver incorporates Dolby* Digital and Pro Logic Surround and the DTS** Digital Surround System. * Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Laboratories. ** "DTS" and "DTS Digital Surround" are registered trademarks of DTS, Inc. SPECIFICATIONS AUDIO POWER SPECIFICATIONS POWER OUTPUT AND TOTAL HARMONIC DISTORTION: (Models of area code US only) With 6 ohm loads, both channels driven, from 120 - 20,000 Hz; rated 85 watts per channel minimum RMS power, with no more than 1% total harmonic distortion from 250 milliwatts to rated output. Amplifier section Power Output1) Stereo mode (rated) (6 ohms 1 kHz, THD 1%) 85 W + 85 W Surround mode2) (reference) (6 ohms 1 kHz, THD 10%) RMS output FRONT:133 W per channel CENTER: 133 W SURROUND: 133 W per channel Surround mode2) (reference) (6 ohms 100 Hz, THD 10%) SUB WOOFER: 135 W 1)Measured under the following conditions: Area code Power requirements US, Canadian AEP, UK 120 V AC, 60 Hz 230 V AC, 50 Hz 2)Reference power output for front, center, surround speakers and sub woofer. Depending on the sound field settings and the source, there may be no sound output. Inputs Analog Sensitivity: 800 mV/ 50 kohms Digital (Coaxial) Impedance: 75 ohms Tone Gain levels ±6 dB, 1 dB step Reproduction frequency range: 28 - 20,000 Hz FM tuner section Tuning range 87.5 - 108.0 MHz Antenna FM wire antenna Antenna terminals 75 ohms, unbalanced Intermediate frequency 10.7 MHz AM tuner section Tuning range Models of area code US, Canadian With 10-kHz tuning scale: 530 - 1,710 kHz4) With 9-kHz tuning scale: 531 - 1,710 kHz4) Models of area code AEP, UK With 9-kHz tuning scale: 531 - 1,602 kHz Antenna Loop antenna Intermediate frequency 450 kHz 4)You can change the AM tuning scale to 9 kHz or 10 kHz. After tuning in any AM station, turn off the receiver. While holding down DIMMER, press ?/1. All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure. General Power requirements Area code Power requirements US, Canadian 120 V AC, 60 Hz AEP, UK 230 V AC, 50/60 Hz - Continued on next page - FM STEREO/FM-AM RECEIVER 9-887-542-02 2007C16-1 © 2007.03 Sony Corporation Home Audio Division Published by Sony Techno Create Corporation