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6.10 Updating the firmware in the 4025TR
TECHNICAL DESCRIPTION
The 16 digit display is self-scanning and contains its own character display
memory. Data is written to the displays once per frame. Address latch U1
generates chip enable and address information to the display devices to
allow the MCU to write data to the display and control registers.
The status LED's are controlled by interface drivers U2 and U4. These
drivers are accessed with a serial clock and data stream once per frame.
When all the LED information has been shifted into the drivers, it is latched
there by the LEDSTB signal from the MCU (display header pin 10).
6.9.2
Push buttons (7025-31)
The 28 push buttons are arranged in a 4 x 7 matrix. Data from 7 keys at a
time is latched into U3 by signal SH/LD on U3 pin 1. Address decoder U1
selects which set of 7 switches is latched into U3.
Each time a key is pressed, the MCU firmware generates a key scan code
corresponding to the position of the key in the key matrix.
diagnostics can be invoked by selecting the RAM VIEW from the Toolbox
menu.
The front panel display will show three sets of digit pairs, the
leftmost being the keyboard scan codes. When no keys are depressed,
the key scan code is 00. Pressing a key will show the corresponding key
scan codes, as shown in the table below. To Exit the keyboard test, turn
RAM VIEW off by pressing SHIFT* and then selecting RAM VIEW off from
the Toolbox menu or remove and re-apply power to the unit. See section
5.9 for a complete description of keyboard diagnostics.
6.10.1 611 LTC/VITC Reader
The firmware in the 611 reader is contained in EPROM U23. The following
procedure can be used to update the firmware.
1.
Remove the left circuit card, and remove the three screws which hold
down the submodule. Carefully remove the submodule (6111 VITC
Reader).
2.
If the current firmware in your 611 is JR11L6, then you need to install
the 6110L3 upgrade kit. Contact the factory for instructions if you did
not receive them. If your current firmware is JR11L7 then proceed
with step 3.
3.
Using a small screwdriver, carefully lift out the EPROM U23 being
careful not to bend the pins.
electrostatic conductive foam.
4.
Install the new EPROM, labelled JR11L7, in the socket U23, so that
the notched end is in the same orientation as the silk screening on
the circuit card. Make sure that jumper J7 is in the "O" position and
J5 is in the Ext Sync Position. Make sure that integrated circuit U26
is removed from it's socket. It is no longer needed.
Model 4025TR Film Footage Encoder Manual
Store the old EPROM and in
Keyboard
Page 6-24
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