Sansui D 300 M Service Manual

Page 2

D-300M

1. BLOCK DIAGRAM

1-1. TYPE I (GI-1305)

* There exist two kinds of D-SOOM electrical partion, principal difference of
TYPE lfrom TYPE ll.
TYPE I; It has DOLBY NR lC (uA7300) with built in REC amplifier,

A) Recording Operation Block Diagram

TYPE ll; It has DOLBY NR lC (NE64GB), and other models too.

They can not put NE64BB in place of uA7300, please be Carefully.

lCl DOLBY NR
MIC AMP REC LEEEE } 16
REC
v /$/-0<-°---9 HEAD PHONE
MIC -<>--| OPLAY l- OPLAY
l- gVRl pSlc H
951!) *
l
LINE C I2 I4 Is a
[N LP; DOLBY NR
0 pSZk
4 $5
IMUTING fir) LINE our
pSIg Q
IFLI REC LEVEL ADJ 00:2: NR LED PEAK METER
BIAS p nuuunaun
REC/PB TRAP Huang
HEAD iVRl I I I l : I
9529 METERAIVP ' ' I
BIAS ADJ 932 LEVEL METER
pSlu kVRI HM DRIVER
kXOl
TAPE SELECTOR ,
ERASE Béfscgfic TAPE SELECTOR
HEAD
7; N HM M NH METAL INDICATOR
82 $2 ELECTRIC - DC +B_-° f |'°
P C p 3 BIAS SWITCH
pSZh psza
MAGNET
O=>COUNTER mLDI
CONTROL
SWITCH
CfiflzfigARN +8 LOGIC CONTROL
6 ; -[-] FUNCTION SWITCH
52 CUE REVIEW PLUNGER
REC PLUNGER
FF PLUNGER REw PLUNGER
)
B) Playback Operation Block Diagram
PB LEVEL
RECo HEAD AMP ADJ o REC
-<>*- R221? l
pSlb fVRI
olCl I
H-M N N
AMPS
cl CONTROL 5
5 o REC
E 5 H M LPF PLAY 0 DOLBY NR
A pSlg pszk
I . IC 63 , . 4 (If
oOI TAPE SELECTOR MUT'NG ©L'NE OUT
952 952 DOLBY NR LED PEAK METER
T METAL INDICATOR annular.
+8-0 l l l |
0810 METER AMP LEVEL METER
T pSZh 982d DRIVER
STOP PLAY mLDl
KEY KEY