Onkyo TX-SR502 Service Manual page 33

OPERATION CHECK-1
DC VOLTAGE DETECTION PROTECTORS
[NOTE1]
Limit time to apply voltage is 0.5 - 1.0 seconds each channel.
When protection operation does not occur at once, try several times.
[NOTE2]
Don't connect speakers or any load.
Don't short speaker terminals.
1. Set the unit to test mode " Test-1-00 " .
1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
T e s t - _
1-2. Press the DVD button, while the display of " Test - _ " has come out.
Unit will be in the state of " Test-1-00 ".
T e s t - 1 - 0 0
2. Apply DC voltage (+1.5 to +3V) to MULTI CHANNEL (FL, FR, SL, SR, C, SW) terminal, each channel.
3. Check that " Protect " is display come out.
4. Apply DC voltage (-1.5 to -3V) to MULTI CHANNEL (FL, FR, SL, SR, C, SW) terminal, each channel.
5. Check that " Protect " is display come out.
6. Press the STANDBY/ON button.
CURRENT DETECTION PROTECTORS
[NOTE]
In the state of test mode"Test-4-29", the pulse waveform for checking from speaker terminal outputs automatically.
Therefore, oscillator is unnecessary.
1. Set the unit to test mode " Test-4-29 "
1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
T e s t - _
1-2. Press the VIDEO3 button, while the display of "Test - _" has come out.
Unit will be in the state of " Test-4-00 ".
T e s t - 4 - 0 0
1-3. Repeat and press SPEAKERS B until the display of " Test-4-29 " comes out.
T e s t - 4 - 2 9
2. Connect the lord resister (3ohms) to the speaker terminals.
3. Check the not displayed " PROTECT " and speaker relays not turn OFF.
4. Check the each speaker terminals.
5. Connect the lord resister (1.5ohms) to the speaker terminals.
6. Check the displayed " PROTECT " and speaker relays turn OFF immediately.
7. Check the each speaker terminals.
8. Press the STANDBY/ON button.
C l e a r
C l e a r
Disappears
Disappears
TX-SR502/E/8250/HT-R520