Block Diagram - Technics Rs-D400 Serviceanleitung

BLOCK DIAGRAM
Record,'playback
head
Record mode
Test tape
EVM Oscilloscope
MIC JACK
15
ter) AF oscillator RECORD/PLAYBACK
H EAD
• Oscilloscope
—dB
+6
+3 LINE IN(L-CH)
right
VR4
g. 17
• AF oscillator
VR3
Oscilloscope
VR4
IC5 (L-CH) and IC6
ERASE HEAD
NOTES:
Record/Playback switch (shown in playback
position).
EVM Oscilloscope
. ...Input select switch (shown in line in position).
-Dolby NR switch (Shown in OFF position).
..Tape select switch (for Cr02) (shown in OFF
position).
..Tape select switch (for normal) (shown in OFF
position).
FFICUE/REW/REV switch (shown in OFF position).
. Power ONIOFF switch (shown in OFF position).
.Dolby BIC select switch (shown in Dolby B position).
Sl-l Sl-3 Sl.5 S2-l
QI
Cr02/
ooe oee ooe ooe
Metal
ON
Playback EQ
VRI
oee ooe
VR7
To R-CH
VR8
1-8
To R-CH
ooo
S5-2
S4-2
013
ooo ooo
Bias
osc
• VRI,2
• VR3
VR4
• VR5, 6
• VR7,8
• (CZ+) this arrowindicates the flow Ofthe playbacksignal.
) this arrow indicates
) this arrow indicates
playback signal combination.
— this arrow indicates
S2-3
019 PB/ON
ooo
15 14 21
16 17 18
POWER suppL
B/C/OFF
6dB
O
o o
LPF
Sl-9
OGO
Playback gain adjustment VR.
.Balance control.
Input level control.
.Overall gain adjustment VR.
.Bias current adjustment VR.
the flow of the recording signal.
the flow of the recording signal and
the flow of the control signal.
IC5
Dolby NR
19 22
23
VR
HLS
OFF/B;C
BIC
O O
SI-IO S5-2
S5-1
QIS
RECTIFI RE
016
017 D8
Dll
RS.D400
LINEOUT
IC3
REC A M p
05,
REC,EQ
03 | I
Qli
HALF/ONI
Q 14
VoI tage
Regum tor
17 16 15
IC2
2
LED Driver
From R-CH
AC IN