Rx-V795A/Rds/Htr-5170 - Yamaha RX-V795a Service Manual

RX-V795a/RDS/HTR-5170

IC21 : HD6433397A97F
Main Micro Processor
No. Name Function I/O
1 /RES /RES
2 XTAL XTAL
3 EXTAL EXTAL
4 MD1 MD1
5 MD0 MD0
6 /NMI Vcc
7 /STBY or Fvpp /STBY or Fvpp
8 Vcc Vcc
9 P52/SCK0 SCKN
10 P51/RXD0 RDTR/FSW I
11 P50/TXD0 SDTN
12 Vss GND
13 P97 CER
14 P96/ φ
/ST
15 P95 CES
16 P94 CEF1
17 P93 CEF0
18 P92//IRQ0 PDT
19 P91//IRQ1 REM
20 P90//IRQ2 VSY
21 P60 SCKP
22 P61 SDTP
23 P62 RDTP
24 P63 CEP
25 P64 /TMT
26 P65 /FLR
27 P66//IRQ6 –––
28 P67//IRQ7 PSW
29 Avcc Avcc
30 P77/AN7 MTR
31 P70/AN0 KEY0
32 P71/AN1 KEY1
33 P72/AN2 KEY2
34 P73/AN3 REC
35 P74/AN4 PRV
36 P75/AN5 PRD
37 P76/AN6 THM
38 Avss GND
39 P40 VIND
40 P41 VUP
(Note 1) Pin 10 Frequency Switch (R only)
0 AM : 530-1710kHz (10kHz step)
1 AM : 531-1611kHz (9kHz step)
(Note 2) Pin 67, 68 Tuner Mode 0 and 1
Tuner Mode 1 Tuner Mode 0
0 0
0 1
1 0
1 1
(Note 3) Pin 69 Video Format
0 NTSC
1 PAL
37
Detail of Function
CPU Reset
8MHz
8MHz
Mode Set 1 Normal:+5M Flush Write:+12V
Mode Set 0 Normal:+5M Flush Write:+5M
Vcc
Stand-by or Fvpp Normal:+5M Flush Write:+12V
Vcc
O SCK for Non Audio
RXD for Non Audio (RDS) / Frequency Switch
O SDT for Non Audio
GND
O CE for Non Audio (RDS)
I Tuner Stereo
O CE for Non Audio (OSD)
O CE for Non Audio (FL1)
O CE for Non Audio (FL0)
I Power Detect (Low Level Detect)
I Remote (Low Edge Detect)
I Video Vartial Sync (Low Edge Detect)
O SCK for Tuner PLL
O SDT for Tuner PLL
I RDT for Tuner PLL
O CE for Tuner PLL
O Tuner Mute
O FL Reset
–––
I Power Switch
Avcc
I Tuner Meter
I Key State 0
I Key State 1
I Key State 2
I Recout Selector
I V Protection
I DC Protection
I Thermal Detect
GND
O Volume Indicator
O Volume Up
FM : 87.5-108.0MHz (100kHz step)
FM : 87.5-108.0MHz (50kHz step)
Tuner Frequency
AM : 531-1611kHz (9kHz step)
AM : 530-1710kHz (10kHz step)
AM : 531-1611kHz (9kHz step)
Tuner Frequency is selected by Frequency Switch (Pin 10)
(Note 4) Pin 70 RDS Exist or Not
0 Not Exist
1 Exist
No. Name Function I/O
41 P42 VDN O Volume Down
42 P43 IPA I
43 P44 IPB I
44 P45 PRI I
45 P46/PW0 FAN O Fan Control
46 P47/PW1 /FMT O Full Mute
47 Vcc Vcc
48 P27 /MLY O Main Level Att.
49 P28 SPA O Speaker Relay A
50 P25 SPB O Speaker Relay B
51 P24 SPE O Speaker Relay Ext
52 P23 CEL O CE Sanyo for Audio
53 P22 CET O CE Toshiba for Audio
54 P21 SDTA O SDT for Audio
55 P20 SCKA O SCK for Audio
56 Vss GND
57 P17 /R2MT O Room 2 Mute
58 P16 I/E O Video Internal/External
59 P15 VRC O Video Recout Select C
60 P14 VRB O Video Recout Select B
61 P13 VRA O Video Recout Select A
62 P12 VIC O Video Input Select C
63 P11 VIB O Video Input Select B
64 P10 VIA O Video Input Select A
65 P30 PRY O Power Relay
66 P31 Z2DET I
67 P32 TUN0 I
68 P33 TUN1 I
69 P34 VID I
70 P35 RDS I
71 P36 TYP0 I
72 P37 TYP1 I
73 Vss GND
74 ––– –––
75 P81 /SBR O Sub CPU Reset
76 P82 TRO I
77 P83 WCIF I
78 P84/TXD1 MTS/TXD1 O Normal:CPU I/F Main to Sub Flush Write:TXD1
79 P85/RXD1 STM/RXD1 I
80 P86/SCK1 CKIF O CPU I/F Clock
FM : 76.0-90.0MHz (100kHz step)
FM : 87.5-107.9MHz (200kHz step)
FM : 87.5-108.0MHz (50kHz step)
(Note 5) Pin 71, 72 Model Type 0 and 1
Model Type 1 Model Type 0
0
0
1
1
Detail of Function
Input Selector A
Input Selector B
I Protection
Vcc
GND
Zone 2 Detect
Tuner Mode 0
Tuner Mode 1
Video Format
RDS Exist or Not
Model Type 0
Model Type 1
GND
–––
CPU I/F Transfer Request
CPU I/F Word Clock
Normal:CPU I/F Sub to Main Flush Write:RXD1
J
U, C
A, L,G
R, T
Model Name
0 RX-V2095
1 DSP-A2
0 RX-V995
1 RX-V795a