Yamaha RX-V681 Service Manual page 66

RX-V681/RX-A760
P1-3. TMP
TMP1: Temperature of the heatsink (TMP) is detected.
The voltage at 1 pin (THM1) of IC78 is displayed.
TMP3: Temperature of bridge duide (TMP) is detected.
The voltage at 5 pin (THM3) of IC76 is displayed.
Normal value
THM1: 43 to 255
THM3: 43 to 255
(Reference voltage: 3.3 V=255)
* If TMP1 or TMP3 becomes out of the normal value range, the protection function works to turn off the power.
P1-4. OUTPUT LEVEL
Output level of speaker output is detected.
The voltage at 4 pin (AMP_OLV) of IC78 is displayed.
(Reference voltage: 3.3 V=255)
P1-5. LIMITER CONTROL
Power limiter control is detected.
The voltage at 37 pin (AMP_LMT) of IC90 is displayed.
(Reference voltage: 3.3 V=255)
66
P1-3
TMa:224 / 12
THM3
THM1
P1-4
OUTLVL: 255
P1-5
LMTCNT: 255