- 83 -
16V
6V
33V
DELAY
ABNORMAL
VOL. DET.
LATCH
START
LOGIC
OC-RC
OSC
CONTROL
REF
OSC
ABNORMAL
TEMP. DET.
PC661
PC662
PC663
D652
D651
D681
T651
4
3
2
1
4
3
2
1
4
3
2
1
1
3
2
PROTECTION
8
9
15
2
1
14
12
10
4
3
5
6
11
7
Vcc
DRI Vcc
VB
FET
FET
CONT
CSS
CT
GND
G (L)
G (H)
OUT
Vin
VOLTAGE CONTROL
OVER CURRENT DETECT
ABNORMAL VOLTAGE DETECT
-6V
OC
CD
COM
IC681
K
A
REF
STR-Z2156A
Switching regulator
IC651
Timing chart
Pin 4
OSC OUT
Pin 2
Pin 10
Caution : "HOT" Circuit !
Check the switching regulator.
t
t
t
t
t
t
t
t
t
t
t
t
H
L
H
L
ON
LPS
Standby
Suspend
H
L
Turn ON
Turn ON
Picture
Turn OFF
TIMING CHART OF SYSTEM CONTROL STATUS
Power ON Timing
Power OFF Timing
Power Management ON (Ready)
FAN_SW
PANEL_SW
5V_SW
LAMP_POW
No signal
Count down
(FAN Drive)
Projection
Monitor
(15V ON/OFF)
(5V,12V,3.3V,
2.5V,1.8V ON/OFF)
(Lamp ON/OFF)
H
L
4 min.
5 min.
4 min.
Green (light)
Green (blink)
Red
Orange
POWER_LED
15 sec
LPS
LPS
30 sec
Suspend
Check the timing of system controls.
●
No Power
Check !
If this voltage reaches to
abnormal voltage
(exceeds 6.8V), IC651
will be shut down.
If this Vcc voltage reach-
es to abnormal voltage
(exceeds 22V), IC651
will be shut down.
Check the signal at pin
5 of T651. (Switching
power IC output signal.)
Troubleshooting
(
LA P_
AMP
LA
Lamp ON
P
L
(L
W
OW
_P
N/OFF)
P
P_P
N
L
t
●
No Power
P
0
1
4