Yamaha HTR-2064, Service Manual

Page: 60 / 96

Key detection for A/D port
Key input (A/D) pull-up resistance 10 k-ohms
Ohm 0 + 1.0 k + 1.0 k + 1.5 k + 1.5 k + 2.2 k + 3.3 k + 4.7 k (22 k + 33 k) 22.0 k 33.0 k
Nor mal voltage
value range
0 – 0.15 0.15 – 0.42 0.43 – 0.70 0.71 – 0.97 0.98 – 1.24 1.25 – 1.53 1.54 – 1.84 1.84 – 2.10 2.11 – 2.33 2.34 – 2.54 2.54 – 2.71
A/D value range
(3.3 V=255)
0 – 11 12 – 32 33 – 54 55 – 75 76 – 96 97 – 119 120 – 142 143 – 163 164 – 181 182 – 197 198 – 209
Key name
(KEY2, 91 pin)
SCENE
RADIO
SCENE
CD
SCENE
TV
SCENE
BD/DVD
PROGRAM
>
PROGRAM
<
INPUT
>
INPUT
<
–
(Power)
TONE
CONTROL
Ohm 0 + 1.0 k + 1.5 k + 1.8 k + 2.2 k + 3.3 k + 4.7 k + 8.2 k + 10.0 k
Normal voltage
value range
0 – 0.15 0.15 – 0.48 0.49 – 0.82 0.83 – 1.14 1.15 – 1.46 1.47 – 1.79 1.80 – 2.12 2.13 – 2.40 2.41 – 2.91
A/D value range
(3.3 V=255)
0 – 11 12 – 37 38 – 64 65 – 88 89 – 113 114 – 139 140 – 164 165 – 186 187 – 226
Key name
(KEY1, 92 pin)
STRAIGHT MUTE FM MODE
TUNING
>>
TUNING
<<
PRESET
>
PRESET
<
MEMORY INFO
P i n
No.
Port Name
Function
Name
(P.C.B.)
Full on Power off MCU sleep AC off Detail of Function
94 AVSS AVSS MCU MCU MCU MCU Microprocessor GND
95 AN0 IPD_TYPE
AD I I I
DOCK discriminate
AD standby AD standby AD standby
96 VREF VREF MCU MCU MCU MCU AD reference voltage
97 AVCC AVCC MCU MCU MCU MCU Microprocessor power supply
98 SIN4 E2R_MISO SI SI O SI Synchronous data input for EEPROM
99 SOUT4 FLD_MOSI
SO SO O SO
FL driver/Synchronous data output for EEPROM
Low Fix
100 CLK4 FLD_SCK
SO SO O SO
FL driver/Synchronous clock output for EEPROM
Low Fix
60
HTR-2064/NS-B20/NS-C20/NS-SWP20
HTR-2064/NS-B20/ NS-C20/NS-SWP20