Orion TV 38100

Service procedure for Chassis Professional 8000

Power supply

Adjust PP1 for 140V +/- 0.5V across CP37.

Entering service mode

Turn the appliance at the mains switch while holding down the MENU key on the local control until the read LED lights up.
Release the MENU key on the local control an press the stand-by key on the remote control. The appliance will start up in service mode with a specific support menu.
The various functions can be selected using the P+ an P- keys on the remote control and the adjustment can be made using the Volume ± keys. It is advisable to make a note of the initial value before making the adjustment so that it can be easily be restored if necessary.

If the memory NVM (ICR3) is replaced, it is essential to carry out all the adjustments required in service mode because the replacement memory is supplied NOT pre-programmed. If the EPROM (ICR2) containing the software is replaced, compatibility with the existing NVM is verified automatically and if necessary it is initialised. These operations may take some time, so you must wait until they are completed.

Although the individual settings can be accessed and memorised individually and independently, it is advisable to carry them out in the sequence in which they appear when pressing the P- key.

Option byte

The correct value to be set for each appliance is marked on the label on the back of each item alongside the writing Option byte. The value can be entered using the number keys on the remote control.

AFC setting

Connect a generator (or a known transmitter of reliable quality) to the antenna input and use the remote control number keys to enter the value of its RF frequency (which must be within the frequency band indicated by the menu), then press OK. The setting will be made automatically. Repeat the procedure for BG, L and L’ standards. If any of the settings are omitted, operation, automatic search and tuning in this standard may be incorrect.

AGC tuner setting

Connect a generator with an RF level of 1 mV (60 dBmV) (or a known transmitter of reliable quality) to the antenna input and use the remote control number keys to enter the value of its frequency (which must be within the frequency band indicated by the menu), then press OK. The setting will be made automatically.

Screen grid voltage (Vg2)

Adjust the potentiometer G2 on the transformer EHT until the confirmation message appears. No particular signal set-up is required.

Vertical geometry

The VS (Vertical Slope) function must be adjusted in such a way that the central horizontal line in the test signal is exactly on the border between the visible image and the lower black part. It must not subsequently be altered.
Now set the remaining parameters as accurately as possible in the sequence in which they appear.

Horizontal geometry

Adjust as accurately as possible in the sequence in which they appear.

Adjusting white (Red/Green)

Using a B/W bar signal, adjust to obtain a grey image. The blue setting is fixed.

Exiting service mode

Once you have made the necessary adjustments, press the OK key on the remote control in one of the menus in which it is active to memorise all the functions and return to normal operation of the appliance.

Erstellt 27.01.2008, zuletzt geändert 02.09.2008 19:52:55, Zugriffszähler