Hameg HM 1005 oscilloscope repair

Item

Image showing a broken trace on the Hameg HM1005 analog oscilloscope in its vertical deflection amplifier.
Image showing bridged and repaired solder joints for a broken trace on the Hameg HM1005 analog oscilloscope in its vertical deflection amplifier.
Image showing part of the front panel of the Hameg HM1005 analog oscilloscope as well as part of the internals. The image shows a detached belt for ganged switching controlling the regular and delayed timebase.
Image showing a dirty front panel of the Hameg HM1005 analog oscilloscope. This front panel is detached from the rest of the instrument laying flat on a table. It is being prepared to be cleaned.
Image showing the now clean front panel of the Hameg HM1005 analog oscilloscope. This front panel is detached from the rest of the instrument laying flat on a table.
Date
13 November 2022
Is Part Of
Image showing the front panel of the Hameg HM1005 oscilloscope. This 90s series oscilloscope uses physical buttons and a CRT screen for its interface.Hameg HM 1005
Title
Hameg HM 1005 oscilloscope repair
Description
The vertical deflection driver for the CRT had been known bad for quite some time. Upon investigation a damaged trace was found (image 1) on one side of the totem pole drivers and it was bridged (image 2).

After this the unit appeared fully functional if not for several intermittent potentiometers. After identifying several of these potentiometers including, brightness, focus and timebase further ailments where discovered. These include the misalignment of the delay and regular timebase.

The timebases where promptly realigned by adjusting the belt (image 3).

Finally, the front panel was cleaned (image 4 and 5). The final steps remain to clean or replace misbehaving potentiometers.
Media
Image showing a broken trace on the Hameg HM1005 analog oscilloscope in its vertical deflection amplifier.Vertical deflection before repair
Image showing bridged and repaired solder joints for a broken trace on the Hameg HM1005 analog oscilloscope in its vertical deflection amplifier.Vertical deflection after repair
Image showing part of the front panel of the Hameg HM1005 analog oscilloscope as well as part of the internals. The image shows a detached belt for ganged switching controlling the regular and delayed timebase.Realign timing belts
Image showing a dirty front panel of the Hameg HM1005 analog oscilloscope. This front panel is detached from the rest of the instrument laying flat on a table. It is being prepared to be cleaned.HM1005 Front panel dirty
Image showing the now clean front panel of the Hameg HM1005 analog oscilloscope. This front panel is detached from the rest of the instrument laying flat on a table.HM 1005 Front panel clean