Expert FD-760 User manual

SERVICE MANUAL
GxpGrl
FD-760
Stereo Cassette Deck
SPECIFICATIONS
Track System 4-track 2-channel, stereo recording lnput Sensitivity/lmpedance
andplayback MlC.. ...0.3mY/4.7kohms
Tape Speed . 1-718 i.p.s. (4.75 cm/sec.) LINE . . . 40 mV/8.2 kohms
WowandFlutter ... O.\Yo(WRMS) DlN.. ...0.5mV/3.3kohms
Frequency Output Level (at Dolby level)
Response ...50-17,000H2(Metaltape) LINE. ...400mV
50 - 16,000 Hz (CrOu, tape) DIN . . . . 800 mV
50 - 14,000 Hz (Normal tape)
(Dolby NR off)
Sisnal-to-Noise GENERAL
Ratio . . . . . 53 dB (Dolby NR off, CrO2 or Power
Metal tape, CCIR/ARM weighted Consumption 15 watts
400 Hz) Power Supply . . . . . AC 22OY SOl0OHz
The S/N is improved by 9 dB with Dimensions .. 442lWl x297 lDl x 133(H) mm
DolbyNRon. Weight(Net) ......5kg(l1lbs.)
Total Harmonic Accessory . . Shielded Audio Cables (2) .
Distortion ... 1.8Yo(at1 kHz.0VU)
Erase Ratio . 65 dB (at 1 kHz,OVU + 10 dB) Specifications and design are subject to change without
Fast Forward and notice.
RewindTime . . . . . . 90second (C-60tape)

FRONT VIEW
REAR VIEW
V U meter
KL-258T-6 Cassette Holder
N 2031 5Knob 44
N41660
Cassette Key Cap (x S ) Knob 21
N41 53&SS N41661
Push Button (x 6)
N42052-SS Cassette Key Cap
N4153&SSR
rr-r ra,rrrt
a /ar
Lart
o
arDat
Foot Bottorn
No.7102 N20574
-2-

PLAY AMP
ALIGNMENT PROCEDURE
Set the position of Rec. Volume to Max.,
1) Head Azimuth
RIP HEAD PLAY I
(For Alignment points see page 5.)
and of Bal. Volume, Bias Adj. to Center in allalignment.
OUTPUT
DOLBY AMP AMP LIN E OUT
U
\- 2l vu Meter LrN E rN DO LBY AMP OUTPUT
METER AMP
+2dB (DOLBY LEVEL)
CONF IRMED OUTPUT
VO LTAG E
100mV
QVM
VU METER
400H2
PLAY AMP
TP705, 706
DO LBY AMP
TP705 ,706
ADJ
V.M = 100mV
OUTPUT
METER AMP
\-
\- RIP H EAD
3) PIay Back Level
+2dB
ADJ.
Controls to be positioned Test Tape P roced u re
Dolby NR : OFF
MPX : OFF
Tape Selecto r . NO R MA L
Function : PLAY
MTT.114 1 ) Adjust the head mounting screw in order to
obtain max. V.M. indication.
VU METER
Contro ls to be positioned Test Tape P roced u re
Dolby NR : OFF
MPX : OFF
Tape Selecto r . NO R MA L
Function : REC.
BIank
Normal 1) Apply 400H2, approx. 40mV signal at the LINE
lN terminal.
2) Make the voltage at TP705 and TP7 06 be 100mV
by adjusting applied signal level. (GND: TP710)
3) Set the VU meter indication to DO LBY LEVE L
(+2dB) (double D mark position) by the
adjustment of SV RB 1 1 an d 812.
Controls to be positioned Test Tape P roced u re
Dolby NR : OFF
MPX : OFF
Tape Selector : NO R MA L
Function : PLAY
MTT.150 Ad just SV R 70 1 an d 702 to make the output
voltage at Dolby testpoints of TP705 and 706 be
100mV. (G N D: TP7 10)
-3-

ALIGNMENT PROCEDURE
4l Bias Trap / Bias Voltage A ,^ , ,,
TP7071708
B IAS-OSC APPROX. 60KHz
OSC
TP705 /706
R ECOR D EO AMP
NOTE: The Bias Voltages indicated in the above table do not necessarily correspond to the best recording character-
istics of dynamic range, distortion, frequency response, etc.
Make some adjustments according to the best values actually obtained.
5) Recording Level Caliblation DOLBY AMP R ECOR D EO AMP {-ADJ
RIP
LINE IN
400H2
H EAD
ADJUSTMENT (A) (BIAS TRAP)
Controls to be positioned Test Tape P roced u re
Dolby NR : OFF
MPX : OFF
Tape Selector . METAL
Function : R EC.
Blank Ad justing L703 , 704 to m in. ind ication on the
V.M. scale at the Test point of TP7 07 and 708.
(GND: TP709)
ADJUSTMENT (B) (BIAS VOLTAGE)
Dolby NR : OFF
MPX : OFF
Tape Selector : METAL
J
EXTRA
J
NOR MAL
Blank
Metal
X L-II
B H F-60
1) Connect V.M. across TP7011703 and TP7021704.
Step ITa pe Se lecto rAppro x.
Voltage Adjust
1 [ MErAL T ao mv SV R 707 ,7OB
2 | rxrRA(croz) | b5mV SVR2
3 [ NoRMAL | _1x ly_ _SVR 1
Controls to be positioned Test Tape P roced u re
Dolby NR : OFF
MPX :OFF
Tape Selector . NORMAL
1 ) Apply 400H2, approx. 40mV signal at the
LINE lN terminal.
2l Make the voltage at TP705 and TP7 06 be 100mV
by adjusting gpplied signal level.(GND:. TP7 lOl
3) Set the SVR705 and 706 to the mechanical
center.
4l Record the signal into the test tape.
5) Play the recorded signal and check the output
voltage at TP705 and 7OG being either 100mV
or not. lf not, adjust SVR705 and 706, and
then repeat step 4l and 5) untill 100mV is
obtained.
-4-

o-
E.
F
(n
g
co
)5
703
irj-
0
'06
704
(R)
*
7oe t Prrro,
O nlss
R 745
EC/PLAY LEVE L
SV R 701
(L)
,,^. R 756
v
P TP708
TP
PLAY BACK LEVEL
DCA.196
ALIGNMENT POINTS
BIAS (METAL)
,D'II,'O'
co-21 1A
METER
SVR 1 (NORMAL)
(CrOz )
B IAS
-5-

E :*d
g I?
!P
oi-
e B3d
3 F=
,S i7t
o!v,
orE
t'!! or
EC
K"0
CASSETTE AMp WTH DOLBY NR BOARD (DCA-196)
I
L____1
I
b-e=-e---l--Fa-
-
Itsr .Sqr
o
()
I
(o
g)
E
-
TD
!
z
o
r;+l
Li'rt
,v,
-J
2-
o
g
u,
o
1A
C)
f)
o
I
!
t
o
E
rI
6
G,
{
o
!0
{
m
,,
U,
G
!
!
r
-m
o
IP
3
t
T
f)
IP
!m
t
N
@
or
rt{
't, o o
I tD!
: ZE
N-m
ouI.
Gtr
\/!v, r,C
tp!l-
-
5
'N.g'D
oo
!
m
!
tD
o
o
-6-

powER suppLy, EQ & AMp BoARD (pEA-286)
31
{9
I \,,
^!,-{
-otno
T@B
:.!
3-Z
vm
r-{
>o
I-
v6
a
3B
@9
t
rI
;
o\
!{
cro
E
Gg
DZ
?>
-=
.O!
o
vTP
3=
Po
=>
P=
G!
p{
oO)
P=
=o
>>
'3
\O!
xd
E-
a lTl
,o
rno
rp
rQ
\l
;B
._r {
{
o
99
Dz
'D
:3
rO!
o
'/x
@
CC'
3r
m-
-{ \O
mor
v
-7-

DIN AMP BOARD (DRA-lgO)
7O MIC AMP
PcB(MlA-t9l)
TO POWER SUPLLY,
EO & AMP PCB
(PEA -286)
TO POWER SUPPLY I
EE } AMP PCB
(pen-2s6 )
BIAS OSC BOARD (CO-211A)
TO CASSETTE AMP WITH
DoLBY NR PCB(Dcr-t96)
a.
ll
!t
L---J ^
MIC AMP BOARD (MIA-191)
TO VOLUME CONTR OL
PCB(VR- 193)
I
I
I
I
f
t
TO PoWER SUPPLY, E0
f Al,lP Pc B ( PEA-286)
TO
ERASE HEAD
TO DIN AMP
PCB(DRA-I90) TO C ASS E TTE AM P HTH
DOLBY NR PCB(DRA. I96 )
-8-

CIRCUIT DIAGRAM
r------r-- -----I ---
I ,',rt rrPuI
l-- --I OUIPUI
CUIPUI 3 -
oa
c,-
R6ts 4.7(
R6il ?2x I
I
221 I
r'
I ,,,^,
I -,1
I I sros I
lg'r,
!m
I ro rrrr
I <+,
I l-s'03 I
!
l'.ggl-
I tt*l
1--
I IC IX PUI
n
0n
Lrxt
=l !p
rEt t= l=l
=l
ot
-l
E+
L
-t
ol
;*
E.
t, I
l,'f
l4- it)
t-0lll T
rrP(0RA-rg0)
-
o
4
-
o
:
ol
el
-J-
t-r I
cl21 R73t rt0 0
I
6
6
@
o
I
o
o
o
(J
'+
+l
R'33
-
ot
,r, I rr1
'I
t:
+
=
B=r
I
o+l
fi.
IP703 r I
9T
I P7!I
o
Z
9
e,
2
(J e
o
oP
CASSTIIT AHP ITITH t)OLBY I{R (t)CA - I96)
--,,rit=J
L - - - ?oiiri-*ol?, i]- - r r J
uui]r
Erto-it",
S 701 ry Il2
s00l
s r0r
51Qltl05
o'' i
?SC132t 1f 5
l6
(SIr lO
c;21 0 006,,,
E
@
r-
@
@
r
lc,or
I rsl'o
J
Ieg
-ee
lec
t--
l6€
Ioc
fn
r00 P
-1F
c705@
=
=
e
*,r, ,,irn ls'02- ' l
3l cnl tloo.t,J,
R73t
It0
F= SYl106r' r,0,
t:r
|----
Iil003
l:l
E
,50
IF
001
P
G
et
.o
n
E
3t
6-
-l
c:th
-<
!o
c-
*o a
==.
9!3
o
o
a-
Eo
G-
o
()
t-t
lol
I -l
EI
cTlt t6Il0
-
G, ffit;
lFo.z*l
e
c
o
o
E#
I c-l
)L
IB
o'"k- -'j"i-
1 l " lr{rr{
o I clrg .ll -- lr
R-,f--.-;;l
SVn,05 r I t03
0 001 1t.003
--I
J ,ract r{tAo
e ?0 r,02 ( lll?300PC I0I l6 0r.I
2356rle 1 3
065 a
JII5 65 6515s17165 6655 55 I

I ,,,^r o
r
l,'*,
I lsros I
ls
I rrr* r
l-
Iry.
I@
OllTBYTT
<-+
Isroil
P0rER suPrrY & t0 t AxP(PEA-2S6)
-----------R '09
56r
-I 5?01-S7l?---Rtt0RD rtnY SU (rr.nvr
Stol ---P0W[R SUtorrl
Sl0t ---D0LBY XB Sw( o x )
sl03 ---i0 StttCItR sw(o N)
Sll4 ---BIAS Sw(o x)
s60l 602 --- 0ll- i(R ruro 5w( Rc A)
510? ---H0T0l sw(o r)
ol
ol
-ol-
6r
,6
'*
_E\
--l
rrh
8Ei =
Eb:
--l c.
,fl7
I
I
I
I
oa90
oJOo
syR4.2l(e- 0?
0t? 5 6
tsrtttl +;I
13r
mIl
.Cl5 Rzt
--r
' a-l
^ llr
ir
HtAD PH0lrt (HP-193)
06 rl S r
?s059?xC
LAMP ( tuclu oe vu METER )
ru ro+ I
rd rn l5':
!
I
I
J
0t0r ?sc?209,R s-
r1s",r f rB
t ut0l
I500ml
-)r
--J ItUl0t T50r
I-I- l 8l0ux
P0ttt rnlxct
t?l - o7t5
.!I u u !l! sjlE s,o, s7o6 s,os s,ol s,03 sro? sTol
n;ma,;a;t rrc-P*Y sr
l0l ry 7l? RtC-Pl.tY SW (Pl.lY) S80? I0I0n Sr t 0X r
l0r Pottn sw ( (lft I s 60t.60? llu-lcl lulo sl (tcl)
l0l 00l.lY lf SW ( 0I r S t02 IPI Sf (0ff r
193vl05 IlPtStLtcltn SW (Itlltl
AC B0rR0 (P[- r95)
.A/ rC220
II
DZor , I nerono
L9J,'l,i:
B:o'r.rrf i \<Y l(Rtt-trO)
,ii; rJii"' =t ;' +-=!
Ii= trl l:ls
t h rhr
0 | ?sc t3?' ,s I
,iii,l:srffi
iiosgzrc J -- E
a= El I
-: IEl\.; -t-t+|J I I ^r
02 2SCr3?' S I
Cl0l tUl0l l3l5ol
Rro3 ro - | E=A E=T O
I o*l ir*l'
iEt:! ;lll# _!
!n
L+
st{lssY I
rltlrt I:
r00tt r0. ex?.