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SL-Q303
Control
circuit
@ BLOCK
DIAGRAM
Drive
Circuit
8
1C201
(AN6680)
X201
O
9 1C101
(AN6635)
8
Output
amp.
°°
6
2
a
a
3
(3)
oO
w
Output
amp.
Drive
coil
&
®
fk
Cy)
Strobe
illuminator
9on
8
3
>
as]
¢
g
=
&
3 | RL201
| i Start/stop
plunger
$1.
off
(Arm
switch)
Speed
indicator
Oo S2 Ee
b (Start/stop)
Rectifier
Power
transformer
SL-Q303
m TROUBLE SHOOTING GUIDE
1. No rotation
te
Check point
Checking method
Possible defects
Power supply circuit
Q3 emitter voltage
—» 14.3V
Q1~3
Di, 2
Constant voltage
Q201
circuit
Control circuit
(S/S circuit)
1C201
Q201 emitter voltage —»-9.4V
With arm switch (S1) turned on/off, the voltage
changes of 1C201 terminal @ are as follows:
$1
"on"
—7.0V
"oft"
—_>
OV
Voltage at each terminal of 1C101 (in start mode)
(SVs cis "on'"')
Terminal] © | @
sal HEF ®
®
o | @
Drive circuit
Voltage
|13.7/ 9.4| 13.6] 3.3/3.3/ 33/33]
0 | 42/64!
5 .
T
@ | ®
@|@/|@/|®@
0.6/06|
0
[06/06|
0
Terminal
| ® | ©
Voltage
|14.3/13.7/14.3/13.6
Note:
Besides the above-mentioned defects, burnt-out drive coil is also possible.
But if it is on one phase, the motor
rotates although the driving torque is halved.
Also, it is possible that both Hall elements are defective.
2. Abnormal rotation
—
Check point
Checking method
Possible defects
FG amplifier circuit
Solder lead wire to terminal @3) of 1C201; remove
Q203
it from the bottom plate and measure the waveform
1C201
in the state of rotation. (See Fig. 17)
FG coil pattern
20ms
breakage
4
.
;
\
VA
0.4V
2.8V
oe ee
HG
V
Voltage of 1C201 terminal (?) 5.1V
Control circuit
(Reference voltage circuit)
Lead wire
ae
Fig. 17
SL-Q303
3. Unstabl
2
Contro
(Brake,
Note:
Besided |
turntaq
eHow to check
Instrument
1. CR oscillator
2. Oscilloscope
3. 50V 1uF eleq
|
Fz
|
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