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100mm GRAPHICS RECORDER TECHNICAL MANUAL
HA249875
Issue 1 Jan 99
Section 3
Page 3 - 2
SECTION 3: RECORDER DISASSEMBLY
3.1 INTRODUCTION
This section shows how to take a recorder apart, to the level of sub-assemblies (i.e. as far as those items which can be
purchased as spare parts). The instructions are in two main sections - the recorder, including the main processing and
memory circuits as well as the display, and the case (sometimes called 'the sleeve)' which includes the power supply
unit and I/O and option boards, as well as the mechanical connectors etc. accessible from the rear of the case when the
red/orange terminal cover is removed.
Caution
To all intents and purposes, all the circuit boards associated with this recorder contain circuits which are
susceptible to damage by static electrical discharge of voltages as low as 60V. It is therefore essential
that all relevant personnel are aware of correct static handling procedures, and that a proper, static-safe
work area is available, fitted with conductive mats, wrist/ankle strap facilities, and if possible an ion
shower.
Caution
Although this manual describes how to change the display backlight unit, the procedure is not recom-
mended either by the display manufacturer or by the recorder manufacturer. Any repair to the recorder,
which becomes necessary as a result of an unsuccessful attempt to replace the backlight unit, will be
charged for by the manufacturer. I.E. the backlight replacement kit is not warranted.
If an attempt is made to replace the backlight unit, the display manufacturer recommends that a clean
area to class c be available, fitted with static safe equipment as described immediately above.
WARNING!
The recorder must be isolated from all sources of hazardous voltages (i.e. both supply and signal) before
this procedure is started. Hazardous voltages are defined as those greater than 30V RMS or 60V dc.
Note: Flexi-cable connectors consist of two parts,
the housing (which is fixed to the circuit board),
and the clamp which can be slid in and out of the
housing approximately 1mm. To remove the flexi,
the clamp must be released by pulling on the two
lugs (arrowed in the drawing). Once the clamp has
been pulled out (as shown) the ribbon cable can be
gently removed. To re-insert the flexi, the clamp
must again be pulled out, the flexi inserted into the
fixed part of the connector, and the clamp pushed
into its locked position. When correctly inserted
the flexi cable emerges perpendicular to the clamp
face, with the 'silver' part of the cable almost com-
pletely contained within the connector housing
Flexi-cable connector detail
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