I have a Yamaha Rx-v 1067 (L model)
My receiver shows Ps2 prt 169
According to service manual
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: +3.3s, ACBL, ACM1, ACM2, +5,
DCDC, -3.3V, +3.3HDR (U model)
PS2: ±12A, ±12RY, +5A, +44V, +5DK
Normal value
PS1: 84 to 141 (Nomal), 132 to 190 (PURE
DIRECT)
PS2: 81 to 153
(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.
According to service manual ps2 line has 1.6 v (that means Ps2 prt 124 is ideal) but I found 2.18v (Ps2 prt 169). Higher normal range Ps2 prt 153 (1.98V).
I measured all power supply DC volt is ok (±12A, ±12RY, +5A, +44V, +5Dk) then why the protection circuit volt is not in normal range?
After that I also use a series 100W light bulb in ac and connect my receiver, light is glow a little and all the DC volt drop 12v down to 10v and 44 down to 30v in that situation ps2 part volt goes down to 1.8 and its work fine (as its came down to normal range) (but its not a solution)
Service manual link:
https://drive.google.com/open?id=11gXNl8_cLPWHVZpx68tvevcZ8klxmXItAny help would save me. Thanks