Main 1/5 Schematic Diagram - Philips VR340/55 Service Manual

Main 1/5 Schematic Diagram

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