Leader LS 8105A, Service Manual

Page: 18 / 66

ADJUSTMENT
LS 8105A/LS 8106A
18
Item Adjustment No. Procedure P.C.B.
40
A, B SWEEP
TIME 10µs VR107
(A, SWEEP)
VR108
(B, SWEEP)
SWEEP TIME : A, B
î
10µs H.MODE : ALT
DTM : MIN (fully counterclockwise)
X74-1640
1) Input a 10µs marker signal.
2) Adjust so that the marker peak and scale coincides at every div.
41
A, B SWEEP
TIME 0.2µs TC101
(A, SWEEP)
TC102
(B, SWEEP)
SWEEP TIME : A, B
î
0.2µs H.MODE : ALT
DTM : MIN (fully counterclockwise) B.SWEEP : TC102
X74-1640
1) Input a 0.2µs marker signal.
2) Adjust so that the marker peak and scale coincides at every div.
42
A, SWEEP TIME
0.05µs TC301
(A, SWEEP)
SWEEP TIME : A, B
î
0.1µs H.MODE : ALT
DTM : MIN (fully counterclockwise)
X74-1640
1) Input a 0.05µs marker signal.
2) Adjust so that the marker peak and scale coincides at every div.
3) The marker signal for 0.2µs is inputted, 42 clause is checked, and when
having shifted it readjusts.
(Repeat 42 clause and 43 clauses severl times.)
39
H.POSITION
X-POSITION VR303
(H.POSI)
VR302
(X-POSI)
SWEEP TIME : A
î
1ms H.MODE : A
X74-1640
1) Set the AC-DC switch to GND. (The marker signal can be left input.)
2) Set H.POSI to the 12:00 position.
3) Adjust VR303 so that the trace start point is aligned with the left end of
scale.
4) Set H.MODE to X-Y.
5) Adjust VR302 so that the spot comes on the scale center.
44
D.T.POSI
only with a
"LS 8106A"
VR103 (Start)
VR104 (Stop) X74-1640
45
D.T.POSI
only with a
"LS 8105A"
Start: VR103
Start: VR104
1) Turn the MAIN and FINE potentiometer of D.T.M. control fully
counterclockwise.
2) Adjust VR103 so that the start of B-SWEEP is aligned with 0.12div., of
the scale.
3) Turn the MAIN and FINE potentiometers of D.T.M. VR control fully
clockwise.
4) Adjust VR104 so that the end of B-SWEEP is aligned with 10.0 div., of
the scale.
AC/DC: GND H. MODE: ALT
SWEEP TIME: 1ms B. SWEEP: 10µs
X74-1640
H.MODE : ALT AC-DC : GND
SWEEP TIME : 1ms B.SWEEP TIME : 10µs
1) Turn the MAIN and FINE potentiometers of D.T.M. control fully
counterclockwise.
2) Adjust the R/O display to 0.40 ms with FINE.
3) Adjust VR103 so that the start of B sweep is aligned with 0.4 div., of the
scale.
4) Turn the MAIN and FINE potentiometers of D.T.M. control fully
clockwise.
5) Adjust the R/O display to 10.00 ms with FINE.
6) Adjust VR104 so that the start of B sweep is aligned with 10:00 div., of
the scale.
43
Moving caracter TC302
1) Adjust so that the R/O caracter does not move.
Set R/O capaciter to indication
A-SWEEP TIME : 1ms X10MAG: ON
X74-1640
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