R9008: Y-Gain Ch I; Y-Gain Ch Ii; R7002, R7003, R7001, R 7005: Readout Position; R4839: Xy-Gain - Hameg HM1004 Service Manual

27) R9008: Y-Gain CH I.

press Cursor Down pushbutton once.
Y1/2-GAIN is highlight, press CURSOR ON/OFF pushbutton.
Locate and identify R9008 (27) on YF-Board.
Connect a 25mVpp/1kHz square wave signal via 50Ω cable and 50Ω through terminator
to input channel I.
Set time base to 1ms/div.
Adjust R9008 (27) for 5 division signal height.
Note: This adjustment affects Y-Gain CH II.

28) Y-Gain CH II.

Note: The adjustment under item 27) must be finished before this procedure is started.
Press TRIG.SOURCE pushbutton once.
Connect a 25mVpp/1kHz square wave signal via 50Ω cable and 50Ω through terminator
to input channel II.
Set time base to 1ms/div.
Press VAR. pushbutton for CH II once
Rotate VAR.(28) for 5 division signal height.
Press RECALL pushbutton to exit Y1/2-GAIN adjust.

29) R7002, R7003, R7001, R 7005: Readout Position.

Press Cursor Down pushbutton once.
Y1/2 POSITION is highlight, press CURSOR ON/OFF pushbutton.
Readout net and two traces appears.
Locate and identify R7002 (29A), R7003 (29B), R7001 (29C)and
R 7005 (29D) on Readout-Board.
Adjust net with R7002 (29A), R7003 (29B), R7001 (29C)and
R 7005 (29D) to the position on the CRT-GRID.
Set trace with POS I to upper net line.
Set trace with POS II to lower net line.
Press SAVE pushbutton once.
Set trace with POS I to lower net line.
Set trace with POS II to upper net line.
Press SAVE pushbutton once.
Press RECALL pushbutton to exit Y1/2 POSITION adjust.
Press AUTOSET pushbutton once to exit CALIBRATION MENUE.

30) R4839: XY-Gain

Press CH II pushbutton to switch channel II on.
Press CH I pushbutton to switch channel I off.
Locate and identify R4839 (30) on MB-Board.
Connect a 10kHz square wave signal of 25mVpp amplitude (HZ60-2) to input CH II.
Press XY pushbutton.
Set X-POS control that the left dot coincides with the graticule center.
Adjust R4839 (30) for a distance of 5 division between left and right dot.

31) VR7006: Calibrator Output.

Locate and identify VR7006 (31) on Readout-Board.
Connect a digital multimeter to the 0.2Vpp calibrator output.
Set up the digital multimeter for DC measurement on a suitable sensitivity setting.
Locate and identify IC7010 on CT-Board.
Connect pin 1 and pin 14 of IC7010 galvanically together.
Adjust VR7006 (31) for exactly 200mV ± 1mV DC.
Remove the connection between pin 1 and pin 14 of IC7010.
Connect a 10:1 probe to the 0.2Vpp calibrator output and connect it to the CH I input of the scope.
Set time base to 0.2ms/div.
Subject to change without notice 55