Onkyo TX-SR302, Service Manual

Page: 6 / 67

OPERATION CHECK-3
OUTPUT LEVEL & THERMAL DETECTION
TX-SR302
P6301
COM
TH1
TH2
30
U16
NAAF-8245
POWER AMPLIFIER PC BOARD
P6301
TH1
COM
Front side
2.7 kohms
1W
T e s t - _
T e s t - 3 - 0 0
T e s t - 3 - 0 2
T e s t - 3 - 0 2
FM STEREO
FM STEREO
C l e a r
Disappears
0.5 sec.
C l e a r
Disappears
0.5 sec.
T e s t - 3 - 0 2
FM STEREO
FM STEREO
OUTPUT LEVEL DETECTION
1. Set the unit to test mode
" Test-3-2 "
1-1. Press and the hold down the
CD
button , then press the
STANDBY/ON
button when the unit is Power On.
1-2. Press the
VIDEO 2
button, while the
" Test - _ "
is shown.
Unit will be in the state of " Test-3-00 ".
1-3. Repeat and press
SPEAKERS B to while the " Test-3-2 " is shown.
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.
THERMAL DETECTION
1. Set the unit to test mode
" Test-3-2 "
Refer to the clause of "Output level detection".
2. Connect the resistor (2.7 kohms, 1W) between
" HT1 "
and
" COM "
terminals of
P6301
.
3. Check that
FM STEREO
indicator is shown.
4. Press the STANDBY/ON button.
<Check by test mode>
The following is the procedure of checking detection operation of a microprocessor in false, by using test mode.