Yamaha RX-V671 Service Manual page 61

P1. SYSTEM MONITOR
This menu is used to display the A/D conversion value of the microprocessor which detects panel keys and protection
functions by using the sub-menu.
When "P1-7. KEY1/KEY2" sub-menu is selected, keys become non-operable due to detection of the values of all keys.
However, it is possible to advance to the next sub-menu by pressing the "SCENE RADIO" (forward) key or "SCENE
CD" (reverse) key on the remote control.
*
Numeric values in the figure are given as reference only.
P1-1. DC
Power amplifier DC (DC voltage) output is detected.
The voltage at 5 pin (DC_PRT) of IC89 is displayed.
Normal value: 35 to 68
(Reference voltage: 3.3 V=255)
* If DC becomes out of the normal value range, the protection function works to turn off the power.
P1-2. PS1/PS2
Power supply voltage protection detection
The voltage at 2 pin (PS1_PRT)/1 pin (PS2_PRT) of IC89 are displayed.
Voltage detects
PS1: ACBL, AC12, AC5, ±7, +3.3s, -5VA
PS2: -VP, +5T, +5A, +3.3s
Normal value
PS1: 33 to 128
PS2: 90 to 166
143 to 220 (±5VA: Off)
(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
Temperature of the heatsink is detected.
The voltage at 12 pin (TMH1) of IC89 is displayed.
Normal value: 42 to 255
(Reference voltage: 3.3 V=255)
* If TM becomes out of the normal value range, the protection function works to turn off the power.
(±5VA: On)
RX-V671/HTR-6064/RX-A710
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