Yamaha RX-V461 Service Manual page 23

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3 7 63 1515 0
9. A/D DATA CHECK
This menu is used to display the A/D conversion value of the microprocessor which detects panel keys of the main unit
and protection functions in using the sub-menu.
When K0/K1 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 turning the VOLUME of the main unit. When using this function, note that
turning the VOLUME more than 1 click would cause the volume value to change.
During signal processing, the condition before execution is maintained.
* The figures in the diagram are given as reference only.
PD/PV
PD: PRD (Power amplifier DC protection detection)
The output of power amplifier DC (DC voltage)
is detected.
Normal value:
PV: PRV (Voltage protection detection)
Voltage detects: ACL, AC2, 10V, S9, +12,
Normal value:
* If PRD and PRV are out of the normal value range,
the protection function works to turn off the power.
PD: 58 PV:119
Reference voltage: 3.3 V=255
TE
L 13942296513
PLDET
LIM H: 255 / L: 90
(LIM: Limiter control)
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.
PI:
www
.
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35 to 81 (Reference volt-
age: 3.3 V=255)
-12, +5V and VP
84 to 153 (Reference volt-
age: 3.3 V=255)
During normal operation
255
H
0 to 100 (Reference volt-
age: 3.3 V=255)
209 to 255 (Reference volt-
age: 3.3 V=255)
6 DE:255
Display
23 ± 4
42 ± 4
66 ± 4
92 ± 4
120 ± 4
147 ± 4
x ao 165 ± 4 u163
y
182 ± 4
198 ± 4
i
217 ± 4
255
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2 9
8
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.
Q Q
3 6 7 1 3 1 5
Value for starting limiter operation
100
L
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)
KEY0 KEY1
SCENE 1 SCENE 3
SCENE 2 SCENE 4
PROGRAM < DIRECT
PROGRAM > AUDIO SELECT
STRAIGHT INPUT <
TONE CONTROL INPUT >
co
SEARCH MODE PRESET/TUNING <
FM/AM PRESET/TUNING >
.
A/B/C/D/E MEMORY
SPEAKERS TUNING
(KEY OFF) (KEY OFF)
RX-V461/HTR-6040/RX-V461DAB
9 4 2 8
0 to 124 (Reference volt-
age: 3.3 V=255)
TH: 69 PL:255
0 5 8 2 9 9 4 2 8
Value for canceling limiter operation
131
H
K0:254 K1:255
m
9 9
9 9
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