Daewoo DV-K884N-SJ, Service Manual

Page: 57 / 128

56
3) Control Mode Specification
!
Mute control (pin 54)
H: 1.8~5.0V, L: 0.0~1.2V
@
PB/EE control (pin 55)
H: 3.3~5.0V, L: 0.0~2.7V
#
REC/EE control (pin 56)
H: 1.8~5.0V, L: 0.0~1.2V
4) Operational Mode
!
EE mode
The audio signal devided by R219 and R220, is input to pin 57 of IC and then output to pin 59 through ALC circuit and Line Amp.
The signal passes C203 and devision circuit (R202, R203), and is input to REC Amp, and output to Line out too.
@
ALC
ALC point is fixed to –6dBv output inside of circuit, and ALC time can be adjusted by R201 and C202.
#
PB mode
The signal read by audio head, is input to pin 5 through high frequency peaking circuit composed of R211 and C201
(EQ: C201+C207). The input signal is finally output to pin 59 through EQ Amp and Line Amp.
Control Port
Mode
Function
Mute Line SW
H Mute open
L Except for Mute close
Control Port
Mode
PB/EE
H PB
L EE
Control Port
Mode
REC/EE
H REC
L EE
Fig. 1 PB mode circuit