Read Sharp ER-A770 (serv.man7) Service Manual online
NOTE 3:
Pull-up/down in the table indicates that the lines con-
cerned require external pull-up/down resistance.
cerned require external pull-up/down resistance.
2-2-2. General description
2-2-3. Signal description
No.
NAME
DESCRIPTION
1
+20V
—
2
+20V
—
3
/RESA
Inverted signal of RESA
4
RESA
Reset signal (Not battery back-uped)
5
SCK2A
Shift clock
6
/HTS2A
Data (Host to Sattellite)
7
/STH2A
Data (Sattellite to Host)
8
SHEN2
Shift enable
9
GND
—
10
GND
—
2-2-4. Display control
1) 7 segment
CKDC9 directly drives the 7-segment display.
The display tube employs a grid blanking dynamic drive and operates
in the following timing.
in the following timing.
<7-segment display>
2) Dot display
M66004FP receives command from CKDC9, and drives the dot dis-
play.
play.
The display tube is driver in the following timing.
RESA
/RESA
SCK2A
/HTS2A
/STH2A
SHEN2A
POS Side
UP-I16DP
RESA
/RESA
/RESA
SCK2A
/HTS2A
/HTS2A
/STH2A
SHEN2A
POS Main PWB
+20V
RESA(RESET)
SHEN2A
SCK2A
-26V
-26V
+5V
CKDC9
G1-G11
SA-SG,DP,AP
SA-SG,DP,AP
7SEG-display
Gn-1
SA~SG
DP,AP
DP,AP
Gn
(n-1~11)
58µS
15~
24µS
24µS
976µS
976µS x 11
/CS
/DCS
SCK
/DSCK
SDATA
DS0
CKDC9
M66004FP
-26V
5V
DG0~DG15
D0~D34
DOT
DISPLAY
DISPLAY
DGn-1
D0~D34
DGn
61µS
11~40µS
488µS
488µS x 16
<Dot display>
Click on the first or last page to see other ER-A770 (serv.man7) service manuals if exist.