Ps1/Ps2; Tm; Output Level; Limiter Control - Yamaha RX-V667 Service Manual

RX-V667/HTR-6063/RX-A700
P1-2. PS1/PS2
Power supply voltage protection detection
The voltage at 2 pin (PS1_PRT)/1 pin (PS2_PRT) of IC902 are displayed.
Voltage detects:
PS1: ACBH, ACBL, AC_12, AC-5, ±12, ±7, +3.3D, +1.8D
PS2: +5I and -5V
Normal value
PS1: 38 to 141
PS2: 34 to 138 (Normal), 120 to 224 (PURE DIRECT mode)
(Reference voltage: 3.3 V=255)
* If PS1 or PS2 becomes out of the normal value range, the protection function works to turn off the power.
P1-3. TM

TM:

Temperature of the heatsink is detected.
The voltage at 2 pin (TMH1) of IC902 is displayed.
Normal value: 42 to 255 (U, R, T, K, A, B, G, F, L models)
(Reference voltage: 3.3 V=255)
* If TM 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 IC901 is displayed.
(Reference voltage: 3.3 V=255)
P1-5. LIMITER CONTROL
Power limitter control is detected.
The voltage at 4 pin (AMP_OLV) of IC901 is displayed.
(Reference voltage: 3.3 V=255)
50
116 to 255 (C model)