Philips VR750 Service Manual page 85

Main 1/6 Schematic Diagram
MODE: SP/REC
" " = SMD
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
1-10-3
PLAY MODE
1 2 3
5.0 ~ 5.0
REC MODE
(2.5)
INDICATES THAT THE VOLTAGE
IS NOT CONSISTENT HERE.
Comparison Chart of IC501 KEY VOLTAGE CHART
Pin No.
Models and Marks
KEY 1 (7 PIN)
Voltage
MODEL MARK 0.00 ~ 0.51V POWER
0.51 ~ 0.92V CH DOWN
VR550/02 A
0.92 ~ 1.27V CH UP
VR550/07 B
1.27 ~ 1.61V ----------------
VR550/16 C
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
1-10-4
KEY 2 (8 PIN)
STOP/EJECT
REW
PLAY
FF
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KEY OFF
HG470SCM1