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■ Troubleshooting
●
No Power_1
Check the switching regulator.
STR-Z2156A
Switching regulator
Caution : "HOT" Circuit !
If a temperature of this
frame reaches to 150˚C,
the IC632 will be shut
down.
Timing chart
Pin 4
OSC OUT
Pin 2
Pin 10
Check the Unit_ Sub Power.
FAN_A12V
FAN_A12V
K66L
25V
FAN-ON/OFF
TP7614
6.35V
K66A
UNIT_SUB-POWER
If this Vcc voltage reaches to
abnormal voltage (exceeds
22V), the IC632 will be shut
down.
IC632
7
11
CHECK !
FL
FL
3
1
2
2
3
K66G
Q1
Q23
Q5
FAN-A ADJ.
FAN-ON/OFF
Q2
TP7611
6.35V
16V
9V
-6V
16V
-6V
POWER-SW
Check the signal at pin 5
of T621. (Switching power
IC output signal.)
Vcc
8
9
PROTECTION
ABNORMAL
ABNORMAL
START
TEMP. DET.
VOL. DET.
DELAY
LATCH
REF
LOGIC
OSC
OC-RC
OSC
CONTROL
6
5
4
CONT
ABNORMAL VOLTAGE DETECT
FAN_B12V
FAN_B12V
FL
FAN_C12V
3
1
2
6
K66E
K66F
Q9
FAN-A ADJ.
FAN-A ADJ.
FAN-B ADJ.
PF
FAN-B ADJ.
Q6
FAN-C ADJ.
IC6
I/O EXP
FAN-C ADJ.
Q18
Q16
Q12
Q14
-55-
If this voltage reaches to
abnormal voltage (exceeds
6.8V), the IC632 will be shut
down.
G (H)
15
2
Vin
1
FET
OUT
14
FET
12
10
G (L)
6
VOLTAGE CONTROL
5
PC611
4
6
PC612
5
4
FAN-ON/OFF
IC5
IC1
I/O EXP
CONTROL
IC2
SCL/SDA
CONTROL
POWER-SW
S9.6V
S3.3V
S6.35V
5VB
16VA
-5V
16V_AU
K66D
T621
D655
9V
D651
16V
D652
6.35V
-6V
1
3
2
3
3
2
2
IC652
1
1
1
2
3
FAN_C12V
SCL/SDA
POWER-SW
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