R7004: Mean Readout Y-Plate Potential; R5015: Auto Focus Correction; R2001: 10Hz Squarewave 5Mv/Div Ch I; R2002: 10Hz Squarewave 1Mv/Div Adjustment Ch I - Hameg HM1004 Service Manual

7) R7004: Mean Readout Y-Plate Potential.

Locate and identify R7004 (7) on Readout-Board.
Press channel I GD pushbutton to ground the input (readout: „CH1:ground symbol").
Set trace to the horizontal center line of the graticule.
Locate and identify the ceramic (double) resistor R9037 with the connections 7A and 7B.
Connect a 10:1 probe to the Y-input of the control oscilloscope.
Set the controlscope to DC input coupling, 1V/div and 2ms/div time deflection coefficient.
Connect the probe crocodile clip with chassis.
Connect the probe tip with connector 7B.
Set the Y position control of the control oscilloscope in such a way, that the signal becomes visible.
The signal contains of a trace (+45V) that represents the trace and two 2ms AC signals representing
the readout signal.
Adjust R7004 (7) that the AC signal is set symmetrically to the DC content.
Remove the probe from connector 7B.

8) R5015: Auto Focus correction.

Locate and identify R5015 (8) on Main-Board.
Press channel I GD pushbutton to ground the input (readout: „CH1:ground symbol").
Turn the FOCUS knob for maximum trace sharpness. This setting must not be changed until
the following adjustment procedure is finished.
Press the INTENS. pushbutton briefly to switch over to readout intensity setting.
Turn the INTENS. knob fully clockwise (beep) for maximum readout intensity setting.
Adjust R5015 (8) for maximum readout sharpness.

9) R2001: 10Hz Squarewave 5mV/div CH I.

Locate and identify R2001 (9) in CH I section of the AT-Board.
Connect a 25mVpp/10Hz square wave signal via 50Ω cable and 50Ω through
terminator to input channel I.
Set time base to 10ms/div.
Adjust R2001 (9) for flat top.

10) R2002: 10Hz Squarewave 1mV/div Adjustment CH I.

Locate and identify R2002 (10) in CH I section of the AT-Board.
Connect a 5mVpp/10Hz square wave signal via 50Ω cable and 50Ω through terminator
to input channel I.
Set input attenuator channel I to 1mV/div
Set time base to 10ms/div.
Adjust R2002 (10) for flat top.

11) R2005: 10Hz Squarewave 5mV/div CH II.

Press CH II pushbutton to switch channel II on.
Press CH I pushbutton to switch channel I off.
Locate and identify R2005 (11) in CH II section of the AT-Board.
Connect a 25mVpp/10Hz square wave signal via 50Ω cable and 50Ω through
terminator to input channel II.
Set time base to 10ms/div.
Adjust R2005 (11) for flat top.

12) R2006: 10Hz Squarewave 1mV/div CH II.

Press CH II pushbutton to switch channel II on.
Press CH I pushbutton to switch channel I off.
Locate and identify R2006 (12) in CH II section of the AT-Board.
Connect a 5mVpp/10Hz square wave signal via 50Ω cable and 50Ω through terminator to
input channel II.
Set input attenuator channel II to 1mV/div
Set time base to 10ms/div.
Adjust R2006 (12) for flat top.
Subject to change without notice 47