Yamaha RX-V461 Service Manual page 17

RX-V461/HTR-6040/DSP-AX461
TH/PL
TH: THM (Thermo protection detection)
The temperature of the heat sink is detected.
Normal value:
* If THM is out of the normal value range, the protec-
tion function works to turn off the power.
PL: PLDET (Power limiter detection)
The output voltage of power amplifier is
detected.
U, C models (Reference voltage: 3.3 V=255)
PLDET
LIM H: 255 / L: 102
(LIM: Limiter control)
R, K, A, L models (Reference voltage: 3.3V=255)
PLDET
LIM H: 255 / L: 90
(LIM: Limiter control)
J model
PLDET
LIM H: 255 / L: 90
PI/DE
PI: PRI (Current protection detection)
The current of the power amplifier is detected.
Normal value:
DE: PDET (Sub-trans power detection)
Normal value:
* If PRI and PDET are out of the normal value range,
the protection function works to turn off the power.
K0/K1
K0/K1: KEY0/KEY1 (Panel key of main unit)
A/D value of the key fails to function properly
when the standard value is deviated by ± 4.
In this case, check the constant of partial
pressure resistor, solder condition, etc.
Refer to table.
(Reference voltage: 3.3 V=255)
30
0 to 124 (Reference volt-
age: 3.3 V=255)
TH: 83 PL:255
During normal operation
255
H
During normal operation
255
H
255
H
0 to 100 (Reference volt-
age: 3.3 V=255)
209 to 255 (Reference volt-
age: 3.3 V=255)
PI: 33 DE:255
K0:251 K1:252
Value for starting limiter operation
77
L
Value for starting limiter operation
100
L
100
L
Value for canceling limiter operation
100
H
Value for canceling limiter operation
131
H
131
H