Subject to change without notice
31
(8)
RV6021 : Astigmatism correction.
Locate and identify RV6021 (8) on CRT-Board.
Connect a 1MHz squarewave signal with 25mVpp at 50
Ω
(HZ22) to input CHI.
Set time base to 0.1µs/div.
Adjust FOCUS control for optimum sharpness.
Adjust RV6021 (8) until leading edge and top of signal have equal sharpness.
Recheck range of FOCUS control.
Adjust FOCUS control for optimum sharpness.
(9)
R640: Y-Gain CH I.
Locate and identify R640 (9) on YPA-Board.
Connect a 25mV/1kHz squarewave signal via 50
Ω
cable and 50
Ω
through terminator
to input channel I.
Set time base to 1ms/div.
Adjust R640 (9) for 5 division signal height.
(10) R122: FET operating point CH I.
Locate and identify R122 (10) in CH I section of the YPA-Board.
Release all pushbuttons (out!) for channel I mode.
Press Y x5 channel I (in!) for 1mV/div.
Press GD pushbutton channel I (in!).
Switch the attenuator channel I constantly between 5mV/div (1mV) and 10mV/div (2mV).
Adjust R122 (10) until no Y-position change occurs.
Do not change the operating conditions.
(11) R203: Invert-Balance CH I.
Press GD pushbutton channel I (in!).
Press Y x5 channel I (in!) for 1mV/div.
Using Y-POS.I control set trace to the horizontal center line.
Locate and identify R203 (11) on YPA-Board.
Adjust R203 (11) so that the baseline will not move, when pressing and releasing the
INVERT CH I pushbutton.
(12) R177: Variable-Balance CH I.
Locate and identify VR177 (12) in CH I section of the YPA-Board.
Press channel I Y-MAG. x5 pushbutton for 1mV/div.
Press channel I GD pushbutton (in!).
Adjust VR177 (12) so that the baseline will not move when turning the channel I Y-variable
control through the entire range.
Check adjustment 11) again and repeat it if required.
Summary of Contents for HM 303-4
Page 3: ...Subject to change without notice 2...
Page 5: ...Subject to change without notice 4 Y Preamplifier CH I YP Board...
Page 6: ...Subject to change without notice 5 Y Preamplifier CH II YP Board...
Page 7: ...Subject to change without notice 6 Y Intermediate Amplifier and Trigger Amplifier YP Board...
Page 8: ...Subject to change without notice 7 YPA Board Top side...
Page 9: ...Subject to change without notice 8 YPA Board Top side...
Page 10: ...Subject to change without notice 9 XY Amplifier YF Amplifier OS Circuit...
Page 11: ...Subject to change without notice 10 XY Board Top side...
Page 12: ...Subject to change without notice 11 XY Board Top side...
Page 13: ...Subject to change without notice 12 Sync Amplifier...
Page 14: ...Subject to change without notice 13 Time base...
Page 15: ...Subject to change without notice 14 Sweep Generator...
Page 16: ...Subject to change without notice 15 TB Board...
Page 17: ...Subject to change without notice 16 CRT Board...
Page 18: ...Subject to change without notice 17 CRT Board Top and Bottom side...
Page 20: ...Subject to change without notice 19 PS Board Top side...
Page 21: ...Subject to change without notice 20 PS Board Bottom side...
Page 22: ...Subject to change without notice 21 Component tester Calibrator...
Page 23: ...Subject to change without notice 22 CCT Board Top and Bottom side...
Page 24: ...Subject to change without notice 23 Front control board...
Page 25: ...Subject to change without notice 24 Front Control board Top and Bottomside...
Page 26: ...Subject to change without notice 25 Adjustment Procedure...
Page 31: ...Subject to change without notice 30 10 12 7 11 9 8 YPA Board PS Board...
Page 35: ...Subject to change without notice 34 A C D B 24 B D C A 23 YPA Board 21 A D B C...
Page 39: ...Subject to change without notice 38 YPA Board 35 32 34 31 33 TB Board XY Board...
Page 41: ...Subject to change without notice 40 37 36B Pin 14 Pin 1 CT Board 36A XY Board...
