Operation Check - Integra DTR-7.7 Service Manual

OPERATION CHECK-3

CONTROL OF POWER SUPPLY (SPEAKER OUTPUT SENSOR AND THERMAL DETECTOR)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange power amplifier PC board ass'y (NAAF-8678, NAAF-8682).
3. Exchange thermal sensor PC board ass'y (NAETC-8680).
[Procedure]
<Note>
No output. No input.
Output Sensor
1. Press and hold down CD button, then press STANDBY/ON button while the unit is Power ON.
" Test - _ " will be displayed only for 5 seconds.
2. Press VIDEO 3 button while " Test - _ " is displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE
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. (FL+FR+C+SL check)
+
5. Press TONE
button and confirm that the red characters of " FM STEREO " is displayed and
the relays (RL6901 and RL6902) are turned off in 2 or 3 seconds as well as 4. (C+SR+SBL+SBR check)
6. Press STANDBY/ON button.
Thermal Detector
1. Press and hold down DISPLAY button, then press STANDBY button when the unit is power ON.
The main microprocessor version will be displayed only for 3 seconds.
<Ex.>
2. Press TONE button while the version is displayed, then the temperature will be displayed.
<Ex.>
3. Confirm that the displayed temperature is within +/-20 C from the ambient temperatures.
4. Press STANDBY/ON button.
T e s t - _
Blinks
T e s t - 4 - 0 0
+
button until " Test-4-36 " is displayed.
T e s t - 4 - 3 6
FM STEREO
T e s t - 4 - 3 6
FM STEREO
T e s t - 4 - 3 7
C l e a r
V e r . 1 .0 1 / 0 6 9 2 0 a
T : 2 5 C / 7 7 F
C le a r
Turn off
Turn off
DTR-7.7