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SHIELD BOX
C297
10UF
-12VDCPL
R397
20.0
PROBE INPUT AMPLIFIER
+12V
R490
3.32K
6.2V
BEC
Q492
Q390
Q295
GAIN TO TP389
APPROX. 1.15 (X1)
Q390
Q-0712
VR390
D-0166
C391
.1UF
+12V
2
TP389
1
2
1
2
P389
1
2
J389
AND 11.5 (X10)
Q294
Q-0190
C392
4.7PF
R395
*SEL
+12V
-12V
R393
1.00K
R394
82.5
R392
2.21K
R298
2.21K
R391
100.0
R390
47.5
SDG
Q493
Q493
Q-1025
Q496
Q-0188
Q492
Q-0711
CR493
D-0246
+12V
+12V
-12VDCPL
-12VDCPL
R496
1.82K
R396
5.62K
R497
332.0
R493
100.0
COMP
PROBE
R495
1.13M
C495
.047UF
R492
9.1M
C493
1.8-10PF
-12V
C494
4700PF
R494
475.0K
R499
249.0
1
2
J498
PROBE
PANEL
FRONT
1
2
P1203
D3
<25>
LOW - X1
HIGH - X10
C492
.1UF
2
3
6
7
4
U490
LF351
C490
.22UF
R491
10M
/PROBE_X1
+12V
-12VDCPL
X10 RESP
CR294
D-0141
C394
2-18PF
R295
20
C395
33PF
+12V
-12V
R296
2.21K
X10 GAIN
Q295
Q-0711
Q296
Q-0188
+12V
-12V
R398
82.5K
R399
39.2K
C491
.1UF
-12V
R297
1.50K
R498
10.0K
NOTE: R395 IS USED FOR CUSTOMER SERVICE APPLICATIONS.
WHEN THIS BOARD VERSION IS INSTALLED IN INSTRUMENTS
BEFORE S/N B020000, REMOVE Q295 AND INSTALL A
357.0 OHM RESISTOR FOR R395.
CVR796
+5V
+12V
R893
37.4K
R797
1.00K
R798
1.00K
VR796
431C
PROBE CALIBRATOR
R795
20K
+12V
R897
2.00K
1V P-P
PANEL
FRONT
CAL OUT
1
J899
CALIBRATOR
AMPLITUDE
Q897
Q-0190
PROBE_CAL_OUT
-12V
-12V
R896
15.0K
R898
1.00K
R899
2.00K
R895
2.00K
A
R
RAC
<25>
A3
J885-33
CAL_TIMING
+2.5V
R894
1.00K
1780R-SERIES
PART OF A6 VECTORSCOPE BOARD
PROBE INPUT & D.C. RESTORER <3>
PROBE OUTPUT AMPLIFIER
6.2V
VR1117
D-0166
Q1113
Q-0188
C1118
.1UF
+12V1
+12V1
R1111
3.32K
<4>
A4
PROBE_VIDEO
1V VIDEO
3
TP1120
Q1115
Q-0190
C1222
1.8-10PF
C1116
10PF
+12V1
R1117
2.21K
R1116
1.00K
C1113
22PF
Q1218
Q-0198
Q1111
Q-0198
R1107
250
+12V1
-12V1
R1218
1.00K
R1115
2.21K
R1108
681.0
R1106
1.00K
R1113
10.0
PROBE GAIN
1
2
J1203
Q1110
Q-0190
-12V1
-12V1
R1109
1.21K
R1213
5.62K
R1214
5.62K
R1110
20.0
R1114
20.0
PROBE RESP
-12V1
1781
22PF
DC RESTORER
1780REF
36PFC1221
C1221
36PF
-12V1
C1211
100PF
C1212
470PF
R1216
22M
C1213
.1UF
+12V1
R1112
301.0K
<7>
C5
C1312
.1UF
Q1309
Q-0190
Q1215
Q-0198
2
3
6
7
4
U1211
LF351
R1314
7.5M
SLOW/FAST
+12V1
-12V1
-12V1
R1309
26.7K
R1217
1.50K
R1310
118.0K
R1215
332.0
3
2
6
57
4
U1217
3080E
C1220
450PF
L1220
56UH
C1216
.001UF
C1313
.47UF
+12V1
R1219
665.0
R1122
665.0
SEE ELECTRICAL PARTS LIST
PARTS WITHIN BOX
HAVE BEEN CHANGED
IN REAR OF MANUAL
Q1315
Q-0188
R1315
7.50K
R1317
1.50K
<9>
G5
CLAMP_-
-12V1
-12V1
R1312
3.32K
R1316
18.2K
-12V1
PART OF A2 WAVEFORM BOARD