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OPERATION CHECK-3
CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange power amplifier PC board ass'y (NAAF-8911).
3. Exchange thermal sensor PC board ass'y (NAETC-8913).
[Procedure]
<Note>
No output. No input.
Output sensor
1. Press and hold down the CD button, then press the STANDBY/ON button while the unit is Power ON.
" Test - _ " is displayed only for 5 seconds.
2. Press the 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, check relay RL6901 and RL6902 are turned off in 2 or 3 seconds.
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L 13942296513
5. Press the STANDBY/ON button.
Thermal sensor
1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON.
" V er . 0 . 50 /05131a " is displayed only for 2 seconds.
<Ex.>
2. Press the TONE button while " Ver.0.50/05131a " is displayed.
<Ex.>
3. Confirm that the displayed temperature is within +/-20 degree C from the ambient temperatures.
4. Press STANDBY/ON button.
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Te s t - _
Blinks
Te s t - 4 -0 0
+
button until " Test-4-37 " is displayed.
Te s t - 4 -3 7
FM STEREO
Te s t - 4 -3 7
C le a r
V e r. 0 .5 0 /0 5 1 3 1 a
T: 2 5 C / 7 7 F
Cl e a r
x
ao
y
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Turn off
Turn off
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HT-R640
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