THOMSON Chipper Check II, Руководство пользователя

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13
Entering the Service Mode
During normal operation, newer chassis (CTC195, 197, 203, 210, 211, MM101, 102, DTV306,
307, and LCOS) are continuously monitoring the I
2 C bus for an acknowledgment from the
EEPROM that resides in the Chipper Check interface box. When these newer chassis detect
that the Chipper Check EEPROM has been connected to the I
2 C bus, the chassis automatically
go into the Service Mode. The chassis must supply the I
2
C clock during this auto-detection,
which unfortunately, runs approximately 5 times faster than the Chipper Check interface box.
The interface box supplies the I
2 C clock once the chassis is in the Service Mode. The speed
of the I
2
C clock from the chassis, combined with the extra resistance and capacitance of the
interface cables and the interface box, will occasionally prevent the EEPROM auto-detection
from working. When the auto-detection does not work, use the manual procedure described
below. When the auto-detection does not work, the chassis will usually shut down and may
have to be unplugged before it will power up again.
Manually putting the instrument into the service mode:
This routine applies to all chassis except DTV306 and DTV307.
1. With the instrument ON, press and hold the Menu button.
2. Press and release the Power button then press and release the Volume UP button.
3. Release the Menu button and the instrument should display the ROM version, a ‘P’
number (parameter), and a ‘V’ number (value).
4. Using either the remote hand unit or the front panel buttons, press and hold the Volume
DOWN button until the ‘V’ value displays 200.
5. Now press the Channel UP button to enter the service mode.
After the instrument is in the service mode the interface box maybe connected. If connected
to the interface box and the instrument is NOT in the service mode, the instrument may shut
down. If this happens, AC power must be removed to restart the set. Once the chassis is in
the service mode and the interface is connected to the chassis, Chipper Check software will
be able to communicate with the set.