Hi. I'm working on a SONY TAAX285 stereo amplifier. The problem is when I want to select an input with front panel switches, the input LED above the switch lights but as soon as I remove my finger from the switch, the LED turns off and input is not selected. This goes for all inputs. I have verified all components from switches to Controller and Function Control IC. The inputs on both ICs are active LOW. Switches put the leads at LOW but it seems one of the chip, who should maintain the LOW state, doesn't do his job. Main Controller IC is a M50761-439P. Function Control IC is a LC7818. When I inject an audio signal (100mVp.p. 1kHz) at Function Control audio input lead (which usually gets it from RCA inputs on the back) I get no signal at the OUTPUT lead. VDD, VEE and VSS are good. And when I hold the input switch I still get nothing at the OUTPUT lead. I am suspecting the Function Control IC to be defect. However, it works in parallel with Controller IC and that's where I get lost. CONTACT ME FOR SCHEMATIC. Thank you.
Hi,
U cant get an amplified out put form ur av receiver for zone 2. speaker a A and B is the same out put of frond left and right. it is not ZONE 2 output. U can get only a pre output for zone to from this receiver. U nee a separate stereo amplifier for using zone 2 .put an amplifier in the other room, connect the zone 2 pre out to it. And do the following setup in ur av receiver .
The receiver shows check speaker cable because its amplifier minimum impedance is 8 ohms . when u connect other speaker in speaker the total impedance will come under 4 ohms. Speaker b is not ZONE 2 in this amplifier
1. press the input selector button A or B to select the source component you want to setup.
2. press and hold LEARN (on remote) button about 3 seconds by using a boll pen or similar object ( SETUP and the selected component name appear alternately in the display window.)
3. press up or down arrow to select "zone2"
4. press LEARN to complete the Zone 2 setup.
5. press source select up arrow to display Zone2 in the window.
6. press an input selector button to select input source u want to listen to in the second room
7. u can control the component by using the component control area button
ok
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