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RS-BX606
Mi TERMINAL GUIDE OF IC'S,
TRANSISTORS AND DIODES
SN7ALSOAMEL | 14 Pin |
SN74LS74AMEL | 14 Pin |
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
¢ 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 =
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