Philips VR750 Service Manual page 19

Main 1/7 Schematic Diagram
MODE: SP/REC
" " = SMD
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
1-10-32
PLAY MODE
1 2 3
~ 5.0
5.0 REC MODE
(2.5)
INDICATES THAT THE VOLTAGE
IS NOT CONSISTENT HERE.
IC501 KEY VOLTAGE CHART
Pin No.
KEY 1 (7 PIN)
Voltage
0.00 ~ 0.51V POWER
0.51 ~ 0.92V CH DOWN
0.92 ~ 1.27V CH UP
1.27 ~ 1.61V ----------------
1.61 ~ 1.98V ----------------
1.98 ~ 2.39V REC/OTR
2.39 ~ 2.90V ----------------
2.90 ~ 3.60V SENS-INH
3.60 ~ 4.30V ----------------
4.30 ~ 5.00V KEY OFF
Comparison Chart of
Models and Marks
MODEL
VR750/02
VR750/07
VR750/16
VR750/58
VR752/07
VR752/16
VR752/58
1-10-33
HG490SCM1
KEY 2 (8 PIN)
STOP/EJECT
REW
PLAY
FF
--------------
--------------
--------------
--------------
--------------
KEY OFF
MARK
F
G
H
I
J
K
L