Subject to change without notice
33
(14) R134: 100Hz Squarewave 1mV/div Adjustment CH I.
Locate and identify R134 (14) in CH I section of the YPA-Board.
Connect a 5mV/100Hz squarewave signal via 50
Ω
cable and 50
Ω
through
terminator to input channel I.
Press Yx5 channel I (in!) for 1mV/div.
Set time base to 2ms/div.
Check that DC input coupling is selected.
Adjust R134 (14) for flat top.
(15) R658: Y-Gain CH II.
Locate and identify R658 (15) on YPA-Board.
Connect a 25mV/1kHz squarewave signal via 50
Ω
cable and 50
Ω
through
terminator to input channel II.
Check that DC input coupling is selected.
Set time base to 1ms/div.
Adjust R658 (15) for 5 division signal height.
(16) R422: FET operating point CH II.
Locate and identify R422 (16) in CH II section of the YPA-Board.
Press CHI/II pushbutton (in!) for channel II mode.
Press Y x5 channel II (in!) for 1mV/div.
Press GD pushbutton channel II (in!).
Switch the attenuator channel II constantly between 5mV/div (1mV) and 10mV/div (2mV).
Adjust R422 (16) until no Y-position change occurs.
(17) R503: Invert-Balance CH II.
Press GD pushbutton channel II (in!).
Press Y x5 channel II (in!) for 1mV/div.
Using Y-POS.II control set trace to the horizontal center line.
Locate and identify R503 (17) on YPA-Board.
Adjust R503 (17) so that the baseline will not move, when pressing and releasing the
INVERT CH II pushbutton.
(18) R477: Variable-Balance CH II.
Locate and identify VR477 (18) in CH II section of the YPA-Board.
Press channel II Y-MAG. x5 pushbutton for 1mV/div.
Press channel II GD pushbutton (in!).
Adjust VR477 (18) so that the baseline will not move when turning the channel I Y-variable control
through the entire range.
Check adjustment 17) again and repeat it if required.
(19) R439: 100Hz Squarewave 5mV/div CH II.
Locate and identify R439 (19) in CH II section of the YPA-Board.
Connect a 25mV/100Hz squarewave signal via 50
Ω
cable and 50
Ω
through terminator
to input channel II.
Set time base to 2ms/div.
Check that DC input coupling is selected.
Adjust R439 (19) for flat top.
(20) R434: 100Hz Squarewave 1mV/div CH II.
Locate and identify R434 (20) in CH II section of the YPA-Board.
Connect a 5mV/100Hz squarewave signal via 50
Ω
cable and 50
Ω
through terminator
to input channel II.
Press Yx5 channel II (in!) for 1mV/div.
Set time base to 2ms/div.
Check that DC input coupling is selected.
Adjust R434 (20) for flat top.
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...
