Hameg HM5014-2 Service Manual page 17

forming a rectangle and a center cross. Also shown is a verti-
cal line 1.5 cm from the right vertical side line, which is 6 cm
large and has highlighted points at each end.
Figure 3-4: Adjustment menu on CRT
The outer 4 lines forming the rectangle must be aligned ex-
actly along the outer perimeter of the CRT graticule, while the
center cross must be aligned with the 2 main axis of the grati-
cule. Deviations of up to 1 mm are permissible, the main axis
permissible deviation is 0.75 mm.
P10
(below 2nd cover)
TCXO
Figure 3-5: Illustration of adjustment locations
To adjust the CRT display, use RV3 on XYZ board (see Fig. 3-
5) to adjust X-amplitude, P2 (see Fig 3-5) to adjust X-position.
Use P5 to adjust Y-position and P7 to adjust Y-amplitude. P2,
P5 and P7 are located on CPU-Board (see Fig. 3-5).
3.2.3 Adjustment of CRT-Z Display and Focus
Select item „TR-ROT" in the internal adjustment menu as
described in section 2.2.1. A set of 6 lines will appear on the
CRT, forming a rectangle and a center cross. Also shown is a
vertical line 1.5 cm from the right vertical side line, which is 6
cm large and has highlighted points at each end.
This display must be without any extra points showing at any
place in the CRT area. Adjust the intensity setting with RV1 on
XYZ-board so that the extra points are not visible, but the rest
of the picture is. Also the width of the horizontal and vertical
center lines should be equal to each other in the center area
of the CRT (astigmatism check). Optimize the representation
of the lines using RV2 on XYZ-board.
Select item „FOCUS" in the internal adjustment menu as des-
cribed in section 3.2.1. Set the value displayed on screen to
2.50 V using the rotary encoder. Now very carefully using an
isolated tool made entirely of plastic or ceramic adjust the Po-
tentiometer RV1005 (see Fig. 3-3) on the PS-board right next
to the XYZ-board for best focused traces on screen. If you pre-
fer working with the unit not in operation, adjust the RV1005
to a new value when the unit is switched off, and switch it on
to check, pressing only Focus button longer to get the normal
P8
P9
3 . A d j u s t m e n t
P3
P6
P7
P4
P1
P5
P2
RV3
RV2
RV1
Subject to change without notice
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