Philips VR540/39 Service Manual page 17

Main 1/8 Schematic Diagram
MODE: SP/REC
" " = SMD
THE SAME VOLTAGE FOR
BOTH PLAY & REC MODES.
1-10-32
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
KEY 1 (7 PIN) KEY 2 (8 PIN) KEY 2 (8 PIN)
(D,E) (F,G,H,I,J,K,L)
0.00 ~ 0.51V POWER STOP/EJECT STOP/EJECT
0.51 ~ 0.92V CH DOWN REW REW
0.92 ~ 1.27V CH UP PLAY PLAY
1.27 ~ 1.61V ------------------- FF FF
1.61 ~ 1.98V ------------------- ------------------- -------------------
1.98 ~ 2.39V REC/OTR ------------------- PAUSE
2.39 ~ 2.90V ------------------- ------------------- -------------------
2.90 ~ 3.60V S-INH ------------------- -------------------
3.60 ~ 4.30V ------------------- ------------------- -------------------
4.30 ~ 5.00V KEY OFF KEY OFF KEY OFF
Comparison Chart of
Models and Marks
MODEL MARK
VR540/39 D
VR540/58 E
VR740/02 F
VR740/07 G
VR740/16 H
VR740/39 I
VR740/58 J
VR742/16 K
VR742/39 L
VR742/58 M
1-10-33 HE473SCM1