Yamaha CDR-HD1500 Service Manual page 47

A B
SCHEMATIC DIAGRAM (OPERATION 1/2)
1
FL TUBE
-22.2
-22.2
2
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~
3
~
~ ~
~ ~
~ ~
~ ~
4
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
-22.2
-22.2
5
1.0 4.1
2.7 4.1
6
1.8 4.1
2.7 4.1
7
8
9
C D E
5.0 5.0 5.0
5.0 5.0 5.0
0 0 0
0 0 0
0 0 0
FL TUBE DRIVER
DECODER/
DEMULTIPLEXERS
0
5.0
5.0
0 5.0
0 5.0
5.0 5.0
5.0 0
0
4.3
0
-28.2
4.1 5.0
4.8
2.7 0.1
0
4.8
0 5.1
0
0 0
0 0
REMOTE CONTROL
RECEIVER
5.1
5.0
2.7 1.8
0
0 0
0 0
F G
~ ~
~ ~
~ ~
~ ~
~ 5.0
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
4.3 ~
5.1 ~
5.1 ~
5.1 ~
5.0 ~
5.0 ~
5.0 ~
2.3 ~
2.3 ~
0 ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~
4.3
Key Input (A-D) Pull-Up Resistance 10 k-ohms
Ohm + 2.2k + 4.7k + 8.2k + 22.0k
V ~ 1.5 ~ 2.5 ~ 3.5 ~ 4.5
PUI_KEY0
INPUT ERASE FINALIZE REC
91pin/AN0
PUI_KEY1
FF/SKIP+ COMPLETE PLAY/PAUSE STOP
92pin/AN1
PUI_KEY2 TRACK NO./
TEXT/TIME REW/SKIP– OPEN/CLOSE
93pin/AN2 BOOKMARK
PUI_KEY3
COPY CDR HDD A.M.Q.R.
94pin/AN3
PUI_KEY4 ENTER
CLEAR MENU MODE
95pin/AN4 (MULTI JOG)
H I J
# All voltage are measured with a 10MΩ/V DC electric volt meter.
# Components having special characteristics are marked s and must be
replaced with parts having specifications equal to those originally
installed.
# Schematic diagram is subject to change without notice.
K L
CDR-HD1500
IC400: HD74HC139FPEL
Dual 2 line to 4 line Decoders/Demultiplexers
4
1Y0
ENABLE 1G 1
5
1Y1
6
1Y2
2
SELECT 1A
7
INPUTS 1Y3
1B 3
12 2Y0
ENABLE 2G 15
11 2Y1
10 2Y2
2A 14
SELECT
9 2Y3
INPUTS
2B 13
PIN CONNECTION DIAGRAM OF TRANSISTORS,
DIODES AND ICS.
2SC2878 DTA114ES HD74HC139FPEL
DTC114ES
8
16
E 1
E
C B C B
M66005-0141AFP-280
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