HI,

1.after 15 of operation the sound from the tuner fm/am
is mute.sometims i hear a burst of the sound and it mute again.i replaced the an-7273.didnt help.others
inputs,tape,cd good.only the sound from tuner.

2.where can i get the schematics of the sa-r177?

thanks,
david

Hi,
A few things it could be.
1) dirty swich contact.
2) Failing capacitor in the shared portions of the tuning strip.
3) poor solder joint from the factory. I would carefully re-flow the solder on all of the shared connections, making sure that the leads actually accept the flow of solder. I would check around the selector switch too.
4) Failing component between the output of the tuning strip to the actual driver stage of the amp.

Give it a thorough visual check, rocking components slightly to see if the leads are loose. Get a can of circuit chiller use the little red tube to keep the spray in a tight space, spray small amounts until you find the area that brings the sound back. This narrows it to an area, and it becomes a matter of checking individual components. It is possible that a discreet transistor is defective. The circuit chiller will reveal this.

Otherwise you need to use noise injection (sitting near a flourescent light< and using a screwdriver as point contact probe) With the screwdriver, touch each solder joint from the point starting from the selector switch, and working back towards the antenna circuit. When you start touching functioning portions of the circuit, you will hear a "buzz", at the point where the buzz stops occuring, is the point to look at things closely, as this would be the portion where most of the problem is going to be.

: HI,

: 1.after 15 of operation the sound from the tuner fm/am
: is mute.sometims i hear a burst of the sound and it mute again.i replaced the an-7273.didnt help.others
: inputs,tape,cd good.only the sound from tuner.

: 2.where can i get the schematics of the sa-r177?

: thanks,
: david

hi, i was given the technics sa - r177 reciver and i didn't get the owner manual wiht it. i was woundering what the total output powere in wats was for this reciver, and what its total output per speeker channel it had( for the fromt left, rear left, front right rear rihgt) if anyone has an answer to my question e-mail me at damnitt@hotmail.com

whut is the total output power to the technics sa - r177 reciver. i wnat to know the total and the total per channal.whut i mean is whut is the output for the fromt right, rear right, fromt left rear left (each individually