Technics RS-BX606 - Troubleshooting Direct Drive Motor; Terminal Guide ICs, Transistors, Diodes

RS-BX606
Mi TERMINAL GUIDE OF IC’S,
TRANSISTORS AND DIODES
SN7ALSOAMEL | 14 Pin |
SN74LS74AMEL | 14 Pin |
26
28 29
30
=
@i
TROUBLESHOOTING
OF
DIRECT DRIVE MOTOR
¢ OUTLINE OF THE DIRECT DRIVE MOTOR SYSTEM
The capstan motor is actuated by the DD motor digital servo
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.
HA13440MPEL AN7351K
MW capstan motorip.p) ciRCUIT
1c 208 (3)
HAI3440MPEL aoomy { i
MOTOR DRIVE smo
To [iJ motor
CIRCUIT
(weol)
HALL
ELEMENTS
HW -IO1A-FT
=
|
2
HALL AMP
C21 25VvI0
[ain |
furcxaarca | 16 Pin
R216 2.2K
:
3
FG
SIGNAL
|
CXA13318
|
|
30
Pin
|
M5218AL
BA6218
GP2S06BC
FG
PULSE
CONT.
AMP
|
FG
BB
crecuit
ens
e
<
BUFFER
AMP
FG
W201k
ALIN
iM
MI
CLOCK
PULSE
2SD592AQRSTA
DTA114ESTP
2SB1357EFTA
OQ
Ps
KSB564ACYGTA
DTC114ESTP
2SD2037EFTA
J201A
sey
Connect
the
IC20I@pin
terminal
to the
ground
with
a
lead
wire.
TT
oev|
SELECT
SPEED
UP
PULSE
AMP
DRIVER
E
cF2o1
ev
[ev
n
C
8B
Be
206
R202
E
Oo.
68K
'
|
era
2]
eet
OT
if
—>{_}
2SD601RTW
Uu
1¢202(1/3)
1¢202(1/3)
SPEED
DOWN
PULSE
2SA1309AQSTA
c
ae
2SC3311AQSTA
ic202
2SO060IRTW
SN74LSO4MEL
SN74LS74AMEL
ECU
EAVOR
2SD1450RSTA
S
INVERTER
FLIP-FLOP
E
E
eB
¢
TROUBLESHOOTING
OF
DIRECT
DRIVE
MOTOR
onesie
en
i
a
ae
Ca
;
;
1SR35200TB
de
MTZJ5R6CTA
5a
Cathode
A
MTZJ9RICTA
1.
The
motor
does
not
rotate.
|
1.
No
power
supply
(+12V).
¢
Check
the
voltage
applied
to
the
fn
pts
bals
2.
The
Hall
element
has
failed
(Current
does
not
|
connector.
Anode
MTZJ33DTA
¢ Check the DC potential on IC201 pins
@Q~@.
* Check the waveform of IC201 pin @.
flow).
3. The ceramic (or crystal) does not oscillate.
MA3056-MTX
Cathode
Anode S
* Check the conductance of the coil.
If normal, the resistances between
1C201 pins @~@, O©~®, O©~@ will
reach 20 ohms.
¢ Check the waveform of IC201 pins @
2. The motor does not rotate
properly. (When pressed,
it stops at certain angles.
Sometimes it does not
rotate even if power is
ON.)
1. The coil is broken or not properly soldered.
2. Output of the Hall element is not proper.
~@.
1. The FG coil is broken. © Check the waveform of IC201 pin ©.
¢ Check if the FG coil is broken.
4. Abnormal wow. 1. Same as those described for problem 2. Poe es
Note: Check the points marked with an asterisk ( by removing the DD motor control P.C.B. and then connecting 1C201 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.)
3. The motor is out of control.
— 2 — 26 =