Integra DTR-4.9 Service Manual page 77

OPERATION CHECK-4
POWER SUPPLY CONTROL
Configuration
The power supply voltage of +/-B1 for power amplifier is changed by the relays (RL6901, 6902).
Power amplifier
FL
FR
C
SL
SR
Condition to operate
The power supply voltage of +/-B1
The state of "VOLH", "T", and "VH or VL" can be confirmed on the FL display. Refer to "OPERATION CHECK-1".
Operation of power supply control (VH or VL)
T ( C) < 60
Thermal sensor
60 <
temperature
Output sensor
[When]
Same as the Current detection check on "OPERATION CHECK-3".
[Procedure]
Notes : No output. No input.
1. Press and hold down CD button, then press On/Standby button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
T e s t - _
2. Press Game/TV button while " Test - _ " is displayed. The unit will be in the state of " Test-4-00 ".
T e s t - 4 - 0 0
3. Repeatedly press + (Tone) button until " Test-4-36 " is displayed.
T e s t - 4 - 3 6
4. At this time, confirm that the red characters of " FM STEREO " is displayed.
And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.
T e s t - 4 - 3 6
5. Press + (Tone) button then " Test-4-37 " will be displayed.
T e s t - 4 - 3 7
6. At this time confirm that the red characters of " FM STEREO " is displayed.
And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.
T e s t - 4 - 3 7
7. Press On/Standby button.
Cl e a r
Thermal sensor
Same as the Thermal detection in "OPERATION CHECK-1".
Output sensor
Thermal sensor
Q6380
THERMAL
Q701
67
MPU
(Main Microprocessor)
VOLH
66
under the following condition.
VOLH (V)
VOLH port of MPU
0.33 to 1.65
< 0.33
5 min.
VH VL
VL VL
Blinks
Test - 4 - 36 : Front L, R, Center, Surround L ch check
FM STEREO
Test - 4 - 37 : Surround L, R
FM STEREO
Turn off
RL6901
S1H+
S1H-
RL6902
S1L+
S1L-
SEC1H
63
Q6707
Operation of relay
1.65 <
VH : high voltage
5 sec.
VL : low voltage
VL
VL
DTR-4.9
+22V
+B1
D6901
To Power amp.
section
-B1
D6903
RL6901, 6902
ON
Off