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Main 1/5 Schematic Diagram
1-11-3
1-11-4
HE274SCM1
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
INDICATES THAT THE VOLTAGE
IS NOT CONSISTENT HERE.
MODE: SP/REC
PLAY MODE
REC MODE
1
2
3
5.0
5.0
(2.5)
~
“ “ = SMD
Comparison Chart of
Models and Marks
MODEL
MARK
VR340/55
A
VR340/75
B
VR740/55
C
VR740/75
D
IC501 KEY VOLTAGE CHART
0.00 ~ 0.51V
POWER
STOP/EJECT
0.51 ~ 0.92V
CH DOWN
REW
0.92 ~ 1.27V
CH UP
PLAY
1.27 ~ 1.61V
-------------------
FF
1.61 ~ 1.98V
-------------------
-------------------
1.98 ~ 2.39V
REC/OTR
-------------------
2.39 ~ 2.90V
-------------------
-------------------
2.90 ~ 3.60V
S-INH
-------------------
3.60 ~ 4.30V
-------------------
-------------------
4.30 ~ 5.00V
KEY OFF
KEY OFF
KEY 1 (7 PIN)
KEY 2 (8 PIN)