R1066: +12 Volt Supply; Vr8003: Trace Rotation Check; R6013: Crt Minimum Intensity; R6024: Astigmatism Correction - Hameg HM1004 Service Manual

ADJUSTMENT PROCEDURE
Locate and identify R1059 (1) on PS-Board (screened section).
Locate connector J4400 ( 8pole Molex) on MB-Board and identify pin 1.
Adjust R1059 (1) for exactly +115 Volts (± 0.1 Volt) at J4400 pin 1 with respect to chassis.

2) R1066: +12 Volt supply.

Locate and identify R1066 (2) on PS-Board.
Locate connector J4400 (8pole Molex) on MB-Board and identify pin 6.
Adjust R1066 (2) for exactly +12 Volts (± 10mV) at J4400 pin 6 with respect to chassis.
At J4400 the other voltages +65V ( pin 2), -6V (pin 8), +5V (pin 4) and -1950V on the cathode
of the CRT depend on the correct +12 Volt adjustment. All these voltages with higher
tolerances must be checked and verified.

3) VR8003: Trace Rotation Check.

Locate and identify VR8003 (3) „TR" on the front panel.
Press channel I GD pushbutton to ground the input (readout: „CH1:ground symbol").
Rotate VR8003 (3) and check that the range of inclination of the baseline is at least 1mm
at both horizontal limits of the graticule.
Readjust baseline exactly parallel to the horizontal center line of the graticule.
Press channel I GD pushbutton to switch back to the basic setting.

4) R6013: CRT minimum intensity.

Locate and identify R6013 (4) on CRT-Board.
Set INTENS. control to fully left position (beep).
Press ADD-XY pushbutton briefly for XY mode (readout: both channel deflection coefficients and XY.)
Adjust R6013 (4) so that the dot just disappears.
Press ADD-XY pushbutton briefly for time base mode.

5) R6024: Astigmatism correction.

Locate and identify R6024 (5) on CRT-Board.
Press channel I GD pushbutton to ground the input (readout: „CH1:ground symbol").
Press ADD-XY pushbutton briefly for XY mode (readout: both channel deflection coefficients and XY.)
Adjust INTENS. (front panel) for low intensity.
Turn the FOCUS knob continuously to defocus the spot in both directions from the focus point
until the next procedure is finished.
Adjust R6024 (5) so that the spot shape does not change when defocussed.
Press ADD-XY pushbutton briefly for time base mode.

6) VR9009: Y-Final Amplifier Balance.

Locate and identify VR9009 (6) on YF-Board.
Switch the oscilloscope OFF.
Locate and identify the Delay-Line with the connections 6A and 6B.
Connect 6A and 6B (short) galvanically ( wire with crocodile clips).
Switch the oscilloscope ON.
Adjust VR9009 (6) to set the trace to the horizontal center line of the graticule.
Switch the oscilloscope OFF.
Remove the short-circuiting wire.
Switch the oscilloscope ON.
Subject to change without notice 45