Yamaha CA-800 Channel Out.

[avionic]

Check and see if its shorted.

 

[HomerJSimpson]

Replaced it with equivalent and still the same result.

 

[avionic]

Stand by Technical difficulty's,,

 

[avionic]

What resistance are you seeing from the emitter of TR708 to chassis ?

 

[mbz]

R714 looks like it got hot.

Good housekeeping to check F705, 3.9ohm 0.5W fusible, may have drifted very high.
Won't be cause of relay issue, just housekeeping...

 

[mbz]

Also check C715 (47uf/16) which does(?) the power on mute timing

 

[HomerJSimpson]

Also check C715 (47uf/16) which does(?) the power on mute timing

Replaced to no avail.

 

[HomerJSimpson]

What resistance are you seeing from the emitter of TR708 to chassis ?

13k

 

[HomerJSimpson]

Good housekeeping to check F705, 3.9ohm 0.5W fusible, may have drifted very high.
Won't be cause of relay issue, just housekeeping...

Tested good.

 

[avionic]

What voltage are you seeing on the base of TR708.

 

[HomerJSimpson]

What voltage are you seeing on the base of TR708.

10.85vdc

 

[avionic]

What voltage at the base of TR709 ?

 

[HomerJSimpson]

What voltage at the base of TR709 ?

.653vdc

 

[avionic]

Collector voltage of TR709 ?

 

[HomerJSimpson]

Collector voltage of TR709 ?

-.017

 

[avionic]

Whats the resistance of R720 ?

 

[HomerJSimpson]

Whats the resistance of R720 ?

10k

 

[avionic]

Do you have any PNP TO-126 transistors on hand ?

 

[HomerJSimpson]

Do you have any PNP TO-126 transistors on hand ?

Ksa1381

 

[avionic]

Sub it in for TR708..