Gestetner A193 Service Manual page 730

TROUBLESHOOTING
5.2 OTHER POSSIBLE CASES
5.2.1 Possible Cases and Results
Fax Unit Installed Software
A639 A639
A804
A804 A639
A804
5.2.2 When A804 Software is Downloaded to the A639 Fax Unit
Because the A804 software is not designed to work in the A639 Fax Unit, if it
is downloaded to the A639 Fax Unit by mistake, the Fax Unit will not start up
at power-on. So, the base copier machine cannot recognise the presence of
the fax unit in this case. No fax functions are available.
To fix this problem, download the correct A639 software to the fax unit using
the ROM board. All the programmed data remain the same as before after
software download, because no RAM initialization was performed when the
wrong software was downloaded.
5.2.3 When A639 Software is Downloaded to the A804 Fax Unit
The A639 software works in the A804 Fax Unit if the Fax Unit is installed in
the A193 copier. However, the standard SAF memory capacity is limited to
1MB because of software limitations.
This does not look like a problem, but is not recommended. So, if A639
software was downloaded to an A804 Fax Unit by mistake, download the
correct A804 software to the fax unit using the ROM board.
(A804)
Base Copier
A193
No problem
Fax Unit not detected.
See section 5.2.2.
See section 5.2.3
No problem
7-24
A224
SC681
See section 5.1.
Fax Unit not detected.
See section 5.2.2.
SC681
See section 5.1.
No problem
SM