Operation Check - Onkyo TX-SR503 Service Manual

OPERATION CHECK-3

CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)
[When]
1. Exchange power transistors (Q6050 - Q6066).
2. Exchange power amplifier PC board ass'y (NAAF-8523).
3. Exchange thermal sensor PC board ass'y (NAETC-8526).
[Procedure]
<Note>
No output. No input.
Output sensor
1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
" Test - _ " is displays it only for 5 seconds.
T e s t - _
2. Press the VIDEO 3 button, while the character of " Test - _ " is displayed.
Unit will be in the state of " Test-4-00 ".
T e s t - 4 - 0 0
+
3. Repeatedly press TONE
T e s t - 4 - 3 7
4. Adjusts MASTER VOLUME to Max. position.
At this time, check the character of " FM STEREO " displayed.
And, check relay RL6901 and RL6902 are turned off in 2 - 3 seconds.
T e s t - 4 - 3 7
5. Press the STANDBY/ON button.
C l e a r
Thermal sensor
1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON.
" V er. 0. 5 0/0513 1a " is displays it only for 2 seconds.
<Ex.>
2. Press the TONE button, while the character of " Ver.0.50/05131a " is displayed.
<Ex.>
3. Check the displayed temperature is +/-20 C of the ambient temperatures.
4. Press STANDBY/ON button.
C l e a r
Blinks
button until the character of " Test-4-37 " is displayed.
FM STEREO
V e r . 0 .5 0 /0 5 1 3 1 a
T : 2 5 C / 7 7 F
Turn off
Turn off
TX-SR503/503E/8350