Technics RS-B555

S555
29 30 31 32 33 34 35
Mi TERMINAL GUIDE OF IC’S,
TRANSISTORS AND DIODES
MB capstan motor(o.D) ciRCcUIT
1c2ol
vom)
HA13440MPEL
oom
|
DIN
tofemain
UPC1297CA
|
18
Pin|
1 30ms. fe MOTOR DRIVE ‘
2 ce & circuit
HALL Sx 1c201 Way el ef s-te-Lsct CONn2010 f TEA0665 [28 Pin|
ELEMENTS
Lee
@)
228
eps.
|
Se
GND
’
HW-IOLA-FT S 4 a f AN7351K
« « e.
"| HD404302SA07 | 42 Pin|
MB88511-224N | 42 Pin|
HALL AMP
R206 2.2K
R216 2.2K
A
oo)
as
C213
car
1
+
=
7
MATRIX
C.CONT
<
t
M5218L | 8 Pin |
|BA6218 | 9 Pin
G6 G5G64 G3 G2 GI
————+—-Wwv
2SA1309AQSTA
2SB621ARSTA 2SC3311AQSTA
2SD592A
2SD1450RSTTA
2SB1030RSTTA
FG
CIRCUIT
C205 Ou
BES¢3 DIR
€204 16VI0 2.2V FG AMP thee
O s#——_®) + ZERO ee
R
2 stb —— = sony DTC114YSTP DTA114ESTP
Se] & coLser ee @)e ee DTC114ESTP
2V¢ osc Le" -|
54043025
A07
ae
|
ae
p
MOUE
ERROR
AMP
Sms
ICRO COMPUTER 557 oat SELECT
L METER)
/
(8)
(11)
(0
Connect
the
IC20I@pin
terminal
2
s
Boe
Sek
to
the
ground
with
a
lead
wire
WWA-$-
tf
WW?
Tezos
0.1
i
MA167TA
2S8B1357DEFTA MA165TA
2SD2037EFTA 1SR35200TB
188133
lM TROUBLESHOOTING OF DIRECT DRIVE MOTOR
Possible Cause Check Points
1. The motor does not 1. No power supply (+12V) ¢ Check the voltage applied to the
rotate. 2. The Hall element has failed (Current does connector.
MA4200M
2SK381BCDTA
MA4047MTA
MA4091MTA
MA4062HTA
MA4120M
=
not
flow).
*
Check
the
DC
potential
on
IC
pins
MA4330MTA
S710
(TIMER)
3.
The
ceramic
(or
crystal)
does
not
oscillate.
@Q~@.
MA4056H
2 isteemnotarcnsey t * Check the waveform of IC pin @. MA4051MTA
AW
'
MA4056MTA
2. The motor does not rotate | 1. The coil is broken or not properly soldered. | * Check the conductance of the
R706 R707 R708 R709 R710
2. pe 47K 6.8K 12K
properly. (When pressed, . Output of the Hall element is not proper. coil. If normal, the resistances
r—}
473
432
{
a
it
stops
at
certain
between
IC
pins
©~@, @~®,
P
©
|
"2
9°s 7 Ef
angles.
Sometimes
it
@~@®
will
reach 20
ohms.
£)
5
i
Le]
z
does
not
rotate
even
if
¢
Check
the
waveform
of
IC
pins
ees
=
a
Ez
power
is
ON.)
@Q~@.
ee
1.
The
FG
coil
is
broken.
¢
Check
the
waveform
of
IC
pin
©.
.
1°:
|
¢
Check
if
the
FG
coil
is
broken.
1.
Same
as
those
described
for
problem
2.
Note: Check the points marked with an asterisk () by removing the DD motor control P.C.B. and then connecting IC
pin @ to GND with a lead wire. (After the DD motor control P.C.B. is removed, current will start flowing through
the coil, heating the IC.)
feo
SMCMVUNTP FM
L istops
(O auto REC MUTE)
— 2 — — 26 — = 20S