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74HC04
SWITCH BLANKING
RETRACE &
+5VD
B4
<12>
LINESEL_RETR
LINE SWEEP
GATING
1
2
3
U775A
74HC32
1
2
3
U780A
74C08
NC
E3
<7>
C786
270PF
SWITCH_BLANK
+5VD
R786
3.57K
12
13
11
U775D
74HC32
C
X
1
4
R
X
1
5
A
1
B
2
C
L
3
Q
13
Q
4
U789A
74HC221
B2
<11>
LINE RAMP
CR775
D-0141
CR778
D-0141
CR777
D-0141
RETRACE_&_SWITCH_BLK
END OF SWEEP
5
6
7
U690B
LM393
+5VD
R593
24.3K
R887
5.62K
DETECTOR
CR590
C593
1000PF
R590
1.00K
2
GENERATOR
C690
51PF
C587
3300PF
CR485
D-0141
CR488
D-0141
Q589
Q-0190
+5VD
-12VDCPL
R692
1.00K
R690
2.74K
R689
26.7K
R588
20.0
1
E5
G3
<9>
LINE
+REF_H_SYNC
4
5
6
U775B
74HC32
3
4
U880B
74HC04
J147-5
<12>
E5
<12>
1L/F
E5
<12>
2L/F
C3
<7>
6.2V
Q361
Q-0190
VR492
D-0461
/TWO
+12V2
+5VD
+5VD
R463
10.0K
R492
3.01K
R363
13.0K
R493
1.00K
NC
DAC
+REF
14
-REF
15
A1(MSB)
5
A2
6
A3
7
A4
8
A5
9
A6
10
A7
11
A8
12
VCC
13
RNGE
1
GND
2
OUT
4
COMP
16
VEE
3
U490
1408
9
10
8
U385C
TL074
+5VD
R489
7.50K
R488
2.21K
RAMP ATTENUATOR
FOR EXT STAIRCASE
R581
499.0
R485
3.01K
R486
3.01K
A3
<11>
RAMP
+12V2
R592
13.0K
R591
10.0K
4
5
6
U790B
74HC32
J130-27
B2
<12>
C3
<7>
TRIG_EN
R891
500.0
NC
P585
1
2
3
J585
J147-2
B3
<12>
J585
RGB - YRGB
1-2 3-STEP RGB PARADE
2-3 4-STEP YRGB PARADE
Q686
Q-0190
/RGB_EN
+5VD
R686
26.7K
R687
2.74K
R587
100.0
R583
59.0
R688
1.00K
13
12
U880F
C394
270PF
12
13
14
U385D
TL074
-12VDCPL
-12VDCPL
R487
13.0K
R490
750.0K
+5VD
+5VD
9
1
0
8
U780C
74C08
E5
<12>
C793
1800PF
FIELD
+5VD
R793
68.1K
FIELD SWEEP GATE
D3
<9>
FLD_RETRACE_GATE
J694
F2
<9>
1-2 NTSC (1780R)
2-3 PAL (1781R)
123
J694
P694
V_SYNC
9
10
8
U790C
74HC32
9
8
U880D
74HC04
4
5
6
U780B
74C08
NC
C795
270PF
CR795
D-0141
D
2
Q
5
CK
3
Q
6
P
R
4
C
L
1
U795A
74HC74
C
X
6
R
X
7
A
9
B
10
C
L
1
1
Q
5
Q
12
U789B
74HC221
NC
3
+5VD
12
13
11
U790D
74HC32
4
FIELD RAMP GENERATOR
C485
.5UF
Q386
Q-0190
+5VD
-12VDCPL
R387
26.7K
R388
2.74K
R394
1.00K
END OF SWEEP
C693
.022UF
CR592
D-0141
-12VDCPL
2
3
1
8
4
U690A
LM393
+12V2
+5VD
R691
26.7K
R890
5.62K
SEE ELECTRICAL PARTS LIST
PARTS WITHIN BOX
HAVE BEEN CHANGED
IN REAR OF MANUAL
DETECTOR
R489 7.50K 7.87K
R487
CKT # 1780R 1781R
13.0K 16.5K
NC
+5VD
DIR_REMSYNC
/DIR_REMSYNC_EN
R795
10.0K
5
6
U880C
74HC04
D
12
Q
9
CK
11
Q
8
P
R
1
0
C
L
1
3
U795B
74HC74
D1
<9>
D1
<9>
F2
<9>
/V_SYNC
1780R–SERIES
RAMP GENERATOR <10>
PART OF A2 WAVEFORM BOARD