Onkyo HT-R820THX Service Manual page 7

OPERATION CHECK-4
OUTPUT LEVEL & THERMAL DETECTION
<Operation check of microprocessor by test mode>
The following is the procedure of checking detection operation of a microprocessor in false, by using test mode.
Output level detection
1. Set the unit to test mode " Test-3-3 "
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 VIDEO 2 button, while the " Test - _ " is shown.
Unit will be in the state of " Test-3-00 ".
T e s t - 3 - 0 0
1-3. Repeat and press SPEAKERS B button to the " Test-3-3 " is shown.
T e s t - 3 - 0 3
2. Apply signal (sine wave 1kHz, -1.5dBV) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channel.
3. Check that FM STEREO indicator is shown.
4. Press the STANDBY/ON button to power Off. (Exit from the test mode.)
Thermal detection
1. Set the unit to test mode " Test-3-3 "
Refer to the clause of " Output level detection ".
2. Connect the resistor 1.8kohms /1W between " HT2 " and " COM " terminals of P6301.
P6301
1.8 kohms
1W
3. Check that FM STEREO indicator is shown.
4. Press the STANDBY/ON button to power Off. (Exit the test mode.)
FM STEREO
Test - 3-03
TH1
TH2
COM
TH1
COM
TH2
P6301
MEMORY
Test - 3-03
FM STEREO
U16
NAAF-8245
POWER AMPLIFIER PC BOARD
MEMORY
HT-R820THX
Front side