DRM 85-C, DRM 85
09/2007
25/41
3.7
Known faults
To date there have been very few reoccurring faults, most problems relate to the
use of very early firmware, please see above There is one known hardware problem
that has occurred on a few occasions and that is detailed in section
failure of
keyboard buttons
.
3.7.1 Failure of Keyboard buttons
This fault is exhibited by a total lack of any operation being possible from the
Record, Play or Menu keys.The cause of this is the failure of the interboard
connector between the Connector PCB (009) and the Keyboard PCB (010) – one
half of the mating pair will have detached from the Connector PCB at the solder
pads.
Figure 19: Keypad connector
Repair requires disassembly of the unit as detailed in steps 1-5 above. It is then a
case of aligning and resoldering the detached part to the connector PCB.
Figure 20: Connector location
The connector can then be resoldered onto the PCB. Note that there are small
alignment pips on the socket to locate the socket square in the PCB, it is most
important to ensure the socket is square to the PCB once soldering is complete.
Figure 21: Connector re-attached
Detached
connector
Keyboard
PCB
Connector
location
Connector
resoldered