Table of Contents
Advertisement
SD-AS10
Resistor RA415 voltage drop is much.
Circuit
QA400 drive circuit
2
QA424 ON > QA408 ON > +D5V is supplied to QA423 BASE >
QA423 ON > QA420 ON > ICA100 RESET (21 pin) low > SLA5515
output FET OFF > Short current OFF.
QA423 ON > Pull QA408 BASE current – – – This circuit is latch.
When QA424 change off, this latch circuit keep "QA408 ON &
QA423 ON".
So, "QA420 ON > ICA100 RESET (21 pin) low > SLA5515 output
FET OFF > Short current OFF" is keeped.
Then µcom detect "1-BIT PROTECT" by QA410 or QA420 and
change into power off mode.
This circuit work is controlled by QA427 & QA411.
+D5V is supplied at speaker relay on only. Because prevent fault
action.
protect response is faster than µcom "1-BIT PROTECT"
Circuit
5
detection.
µcom "1-BIT PROTECT" detection expend long time.
6. When set temperature rise, circuit
QA412.
QA412 ON > QA413 ON > µcom detect "PROTECT" > µcom
change into power off.
<Attention>
: Don't mistake capacitor CA193, CA192 0.001µF.
1
When capacitance is more large, response is delay.
Can't PROTECT IC.
/
: Confirm fault action at high temperature aging.
6
3
Don't work at aging.
This circuit work at abnormal condition.
: Confirm work at (L-) or (R-) short to chassis.
4
: Confirm work at short after speaker relay on.
5
Confirm latch circuit – – – We already confirmed this circuit by your
DC voltage information (Result is OK).
1
-2
1
RA148
5.6K
RA146
5.6K
QA409
KTA1504 GR
2
.
5
work to drive circuit
3
RA147
RA149
5.6K
5.6K
1 2
1
2
DA337
-1
1
KDS121E
3
3
RA354
33K
DA338
RA415
0.1
(2W)
RA409
560
RA406
1K
QA400
KTA1504 GR
6
5
2 – 8
3
RA437
2.2K
4
DA408
KDS160
CA414
RA481
10/16
4.7K
RA474
0
2
1
3
RA480
4.7K
2
1
3
CA418
QA423
2
0.01
KRC102 S
CA419
1
3
0.047
3
2
3
1
QA408
1
KRA102 S
2
3
1
2
CA420
CA422
2
0.1
100/16
QA424
KRC104 S
1
3
CA416
0.0022
6
QA413
KRC102 S
2
1
3
CA421
0.1
RA487
47K
RA485
RA489
1K
1K
RA490
10K
RA488
10K
+B
Advertisement
Table of Contents
