Technics RS-BX828

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29
30
31
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Mi TROUBLESHOOTING OF
DIRECT DRIVE MOTOR
¢ OUTLINE OF THE DIRECT DRIVE MOTOR SYSTEM
Da carstan MOTOR(D.D) CIRCUIT
(Po
te
Ay
jeeui
To
OU.
cN201
ae
so
—
=
;
te
oom}
PVN
Hal
3440MPEL
“a
200
NN
a
ae
ee
The
capstan
motor
is
actuated
by
the
DD
motor
digital
servo
(2) vee } CIRCUIT
1 (w2at)
system. The FG pulse is generated after the detection of
the zero crosspoint, and the reference signal generated from
the quartz oscillator is compared with this FG pulse.
From this comparison, the accelerated and reduced speed
pulses are generated, causing the driving coil to function.
HALL
ELEMENTS
HW -1OLA-FT
HALL AMP
C2it 25vI0
FG SIGNAL
MATRIX
C.CONT
R2U 47
FG PULSE
FG
Bi circuit oa
(9.5V)
game 204 tevio 2-2¥
O~(0)
2
?) a 2
Connect tne IC201@) pin terminal
to the ground with a lead wire.
| JUL
sv}
4
tps. eo
CLOCK PULSE
SPEED UP PULSE AMP ORIVER
(|
|
—— eel
i ob
VW
: Uu
SPEED DOWN PULSE
10.3
19.51
CF201
0
2201
bd
R22 C216 R213
15K S600P 1.5K
AN Le |
ec
ra be. a lee ae
|>e 1302 3b cer b cp2 , |
7 a Fd
1€202(173) 1C202(1/3) : a5]
ao
1C202(1/3) sv¥
MASOSEMTW
1202
1¢203
2SO060IRTW
SN74LSO4MEL
SN74LS74AMEL
REGULATOR
INVERTER FLIP-FLOP
Check Points
e Check the voltage applied to the
connector.
¢ Check the DC potential on 1C201 pins
Q~@.
* Check the waveform of 1C201 pin @.
1. No power supply (+12V).
2. The Hall element has failed (Current does not
flow).
. The ceramic (or crystal) does not oscillate.
1. The motor does not rotate.
%* Check the conductance of the coil.
If normal, the resistances between
1C201 pins @~@, @~®@, O©~@ will
reach 20 ohms.
* Check the waveform of 1C201 pins @
~@.
1. The coil is broken or not properly soldered.
. Output of the Hall element is not proper.
2. The motor does not rotate
properly. (When pressed,
it stops at certain angles.
Sometimes it does not
rotate even if power is
ON.)
ORIVE
CIRCUIT
¢ Check the waveform of 1C201 pin ©.
¢ Check if the FG coil is broken.
3.
The
motor
is
out
of
control.
|
1.
The
FG
coil
is
broken.
4,
Abnormal
wow.
1.
Same
as
those
described
for
problem
2.
Note:
Check
the
points
marked
with
an
asterisk
(4
by
removing
the
DD
motor
control
P.C.B.
and
then
connecting
!C201
pin
@
to
GND
with
a
lead
wire.
(After
the
DD
motor
contro!
P.C.B.
is
removed,
current
will
start
flowing
through
the
coil,
heating the IC.)
RS-BX82:
MI TERMINAL GUIDE OF IC’S,
TRANSISTORS AND DIODES
SN7ALSOAMEL | 14 Pin |
SN7ALS74AMEL
M5218AL
x2
2SD592AQRSTA
2SB621ARSTA
E
a)
MA165TA
RVD1SS8133TA
1SR35200TB
Ca
Sa Cathode
A
Anode
MA3056-MTX
Cathode
Anode .
Cee
|
ee
eae
eee
eee
eee
HA13440MPEL AN7351K
MN4066B 14 Pin
UPC1297CA
CXA1331S | 30 Pin |
GP2S06BC
DTA114ESTP 2SB1357EFTA
OTC114ESTP 2SD2037EFTA
2SD601RTW
2SA1309AQSTA
2SC3311AQSTA c
2SD1450RSTA 5
E
Z MTZJSRIBTA
a MTZJSRECTA
ae
a
MTZJ6R2BTA
K MTZJBR2CTA
MTZJORICTA
MTZJ12CTA
Anode MTZJ20CTA
MTZJ33DTA
LP
Anode ae, LN373GP3ULSC
‘Ne?
“Cathode
ENG
ISAS
ca