Panasonic TC-26LX60C Service Manual page 20

A
B
KEY SCAN
Note:
K-board is included in the control panel assy.
KEY SCAN
C
P
POWER UNIT
N0AB3GJ00010
Exchange board only
D
1 3
CN1
AC CORD
E
F
TC-26/32LX60C Block Diagram (1 of 2)
1
AP DC-DC CONV.
K1 AP6
KEY
1 1
CN3 AP2
24V
1 1
24V
2 2
24V
3 3
10V
4 4
10V
5 5
RELAY
11 11
7VS
12 12
SUB_ON
13 13
CN2 AP1
1 INV 24V 1
2 INV 24V 2
3 INV 24V 3
4 INV 24V 4
5 INV 24V 5
6 INV 24V 6
7 INV 24V 7
8 INV 24V 8
9 INV 24V 9
TO
LCD PANEL
(INVERTER) AP3
INV 24V 2
INV 24V 3
INV 24V 6
INV 24V 7
TO
LCD PANEL
*Q7223
(INVERTER)
AP7
RELAY ON/OFF
INV 24V 1
INV 24V 2
*Q7224
INV 24V 3
INV 24V 4
2 3
20
IC7218
SOUND_20V OVP
SOUND_20V
D7303 D7304
1 +20V 2
5 (+22V)
Q7301
SOUND+18V ON
5V OVP
IC7205
D7301 D7302
MAIN_5V
(+7.5V)
1 +5V 2
5
Q7303
MAIN+5V ON
D7601
(+13V)
D7404
D7403
UNREG_30V
MIX
D7602
9V OVP
IC7209
SUB9V
1 +9V 2
5
10V OVP
*D7223 *D7224
(+15V)
24V OVP
D7203 D7204
(+27V)
10V,24V,SUB+9V
MAIN+5V,MAIN+9V
SOUND VCC,PANEL VCC
OVP DET
Q7204-Q7207
O.V.P, DET CIRCUIT
(DET:AC RELAY OFF)
4
Q7210
SHORT SOS
L:NORMAL
H:ABNORMAL
D
10V, BT30V
SOUND VCC,PAN
SHORT SOS
IC7210
MAIN9V OVP
MAIN_9V
D7452 D7453
1 +9V 2
(+13V)
5
*Q7450
MAIN+9V ON
IC7212 PANEL_Vcc OVP
D7704
D7703
PANEL_Vcc(12V)
(+18V)
1 2
+9V
5
Q7701
PANELVCC_ON
P
5 6