Chapter 5 of the 4025 manual shows how to use the HELP key (located in the group of 8 keys at the right of the 4025 front panel), and how to interpret the error messages that are shown.

Two signals from the telecine (biphase tach and a frame pulse) must be connected from the telecine in order to generate field accurate time code with encoded edge numbers. See figure 2-5 in the 4025 manual that shows the minimum connections required to use the 4025. See section 2.10 of the 4025 manual for information on how to connect these signals from a Rank Cintel Telecine. See section 2.11 of the 4025 manual for information on how to connect these signals from a BTS telecine. For other devices, please contact the factory.

The biphase tach rate is set using the Biphase item of the Engineering Toolbox menu. Make sure that you have selected the correct rate. See section 3.6.3 of the 4025 manual. You also need to select the correct telecine type using the TELECINE item of the Engineering Toolbox. See section 3.2.1 of the 4025 manual.

The procedure outlined in section 2.10.7 of the 4025 manual should be used to verify that you have the correct connections from a Rank Cintel Telecine. The procedure outlined in section 2.11.4 of the 4025 manual should be used to verify that you have the correct connections from a BTS Telecine. It is important to perform these verification procedures before you attempt to use KeyKode with your 4025.

There are several possible scenarios.

Section 2.12 and chapter 8 of the 4025 manual give information on connecting the KeyKode reader to the 4025.

• Correct mechanical alignment of the head with the film path. Make sure that the film is fully engaged in the rollers and that the head is able to follow any sideways motion of the film. See section 2.3 of the 5500 manual for further information on reader head installation.
• Correct negative/print setting.
• Check that the correct sensor is selected for the film type you are using (35 mm or 16 mm). (Section 2.5 of the 5500 manual)
• Check that the intensity setting is set correctly. See the tutorial on LED intensity control in the 5500 manual.
• Check that the barcode has good contrast and that it is printed all the way to the edge of the film. This is particularly a problem with print stock.

The 5500 KeyKode LED should blink each time a barcode is read. The 5500 COMM LED should blink each time a barcode is sent to the 4025. For further information consult the 5500 manual, or the 5500 technical bulletins.

• Check that the correct lower sensor is selected for 35 mm film
• Check that the intensity setting is set correctly
• Make sure that SERIAL BROADCAST is ON and that the SERIAL PROTOCOL is set to WELCH ALLYN. (not WELCH ALLYN MOD)

For further information consult the manual you received with the KeyKode system.

Check the hardware connections. If you have an oscilloscope, check to make sure there is a burst of data on pin #8 of the 4025 end of the cable each time a barcode is read. Check that you have connected the KeyKode reader to the AUX I/O port on the 4025.

If you are using an Evertz 5500 KeyKode reader check that the 5500 baud rate setting is 9600. If you are using the DigiSync reader see section (1b) above.

Check that DIP switch #1 on the centre board of the 4025 is CLOSED and DIP switch #2 is OPEN. With power on, turn the DIP switches to their opposite position and back to verify that the switches are making good contact.

Check that you have learned the head offset in the 4025. Note that there are different head offsets for each film gage and film transfer speed. See section 2.12 of the 4025 manual for the procedure required to learn the head offset. Make sure that you have performed the verification procedures with biphase only before you attempt to learn the head offset. See section 2 of this document.

Check that the KKJAM item of the Film menu is set to PLAY, or ALWAYS.

If you are using 16mm film, make sure that your film type is set to 16MM 20 FR/KEY.

The 4025 edge numbers are driven by the biphase from the telecine. They are updated from the KeyKode coming from the external KeyKode reader according to the setting of the KK JAM menu item. There are several possible scenarios.

The 4025 compensates exactly for the mechanical offset between the reader head and the gate when the telecine is in play. When the telecine is in shuttle, this compensation is only approximate. The 4025 updates primarily from biphase when the telecine is in shuttle. When the difference between the incoming KeyKode data and the 4025's edge number register is greater than the value configured in the SHUTTLE WINDOW parameter (see section 3.7.2 of the 4025 manual) the 4025's edge number register will be updated to approximately to the new KeyKode number. (See section 3.4.1 of the 4025 manual for more information about KK JAM) This apparent discrepancy is no cause for alarm since the 4025's edge number register will be updated to the exact KeyKode number the next time the telecine achieves locked play speed. To eliminate this discrepancy put the telecine in play momentarily before parking on the reference frame.

Setting the SHUTTLE WINDOW parameter to a value that is too small can cause this discrepancy to occur when you are shuttling film with no splices. The recommended setting for this value is 30 frames.

If the 4025's KeyKode numbers are significantly different from those on the reference frame, you have probably shuttled across a splice in the film. When the KK JAM parameter is set to PLAY, the 4025 will update the KeyKode numbers across splices only when the telecine is in play. When the KK JAM parameter is set to ONCE, the 4025 will update the KeyKode numbers only when the telecine goes from stop to play. In both cases KeyKode numbers will not be updated when the telecine is in shuttle. To update the numbers after going across a splice, put the telecine in play momentarily.

If the 4025's KeyKode numbers are only one or two frames different there may be a biphase problem. You need to perform the connection verification procedure described in section 2.10.7 of the 4025 manual if you have a Rank Cintel telecine, or section 2.11.4 if you have a BTS telecine.

If the 4025's edge numbers are not updating from the KeyKode reader see section 3 of this document.

If the 4025's edge numbers are only one or two frames different there may be a biphase problem. You need to perform the connection verification procedure described in section 2.10.7 of the 4025 manual if you have a Rank Cintel telecine, or section 2.11.4 if you have a BTS telecine.

In order for the 4025 to accurately detect where the film frame boundaries are (with respect to the biphase pulses and the KeyKode numbers), it is essential that you calibrate the 4025's framing reference each time a new roll of film is loaded onto the telecine, or when the telecine framing changes due to incorrect splices, panning, zooming, etc. This action in known as 'centering'. See section 3.10.8 of the 4025 manual for a description of several different ways to perform centering.

Whether you are using KeyKode or not, the centering procedure described in section 3.10.8 of the 4025 manual is essential to the accurate operation of the 4025.

If you are performing the centering function each time you load a new roll of film and are still experiencing counting sequence problems then the problem may be that the head offset has not been learned properly. See section 2.12.5 of the 4025 manual for a detailed procedure for calibrating the head offset. Particular attention should be paid to the Target Partial Frame Offset numbers shown on page 2-30 of the 4025 manual. If this value is not correct then you may experience counting problems especially in perf 4 or perf 1 type 35 mm stock.

The 4025 does not update KeyKode numbers across splices in these modes. Use KK JAM PLAY or ALWAYS.

Here is what happens in the 4025 to detect a splice. The 4025 sees data from the KeyKode reader that is showing an out of sequence barcode. It has to delay putting these numbers into the 4025 characters and VITC until the splice goes through the gate. (Usually about 20 frames later). Because the barcodes only come every half foot, the 4025 can not tell exactly where the splice is. Also the delay mechanism is tied to the reading of an actual barcode, so the updating will not occur exactly where the splice is. It should be within 1 foot. During the time between detecting the splice and putting it into the VITC and characters, the + sign (between the feet & frames) will go off. Also the LOCK LED on the front panel will go off. This is normal and is a visual check on when the 4025 detects a splice. When the 4025 puts the new number into its VITC the + sign and the LOCK LED will come back on.

The KKSTATS display of the 4025 gives additional information about the KeyKode and biphase relationships that can aid in determining if the head offset is correctly calibrated. The KKSTATS display is turned on from the Toolbox DEBUG menu. See section 3.8 in the 4025 manual for information on how to access the DEBUG menu. Section 3.11.3 of the 4025 manual gives a detailed explanation of the KKSTATS display.

The following procedure can help you quickly identify if you have learned the correct head offset.

1. Set the 4025's KKJAM setting (on the FILM menu) to NEVER.
2. With the KKSTATS display turned on, park the film on a reference frame. Manually enter the KeyKode number for this frame into the 4025 KKODE register. Note the perf orientation of the KeyKode on the film.
3. Put the telecine in PLAY. The PERF display on the KKSTATS line should correspond to the perf of the KeyKode on the film. The ERR display on the KKSTATS line should be 00. If you try this on different pieces of film with other perf orientations the perf should agree.
4. If either the perf is wrong, or the ERR is non-zero then you should go back and do the head offset calibration described in section 2.12 of the 4025 manual.
5. If you go across a splice in the film, the PERF display should show the new perf orientation of the KeyKode. The ERR display will show ** indicating that the 4025 has not updated its KeyKode registers. If you stop on a reference frame after the splice and enter the new reference frame's KeyKode number, then repeat step 3 above you should see the ERR display go to 00.

These events are usually caused by one of two conditions occurring in the 4025. The messages that occur on the bottom window of the Key-Log capture screen will help in determining what the cause of the extra events is.

When the 4025 senses a change of the pulldown sequence, or speed change in the telecine, it will issue a 'Lock Exit' packet to the Key-Log software that will finish the event. When the 4025 sees a stable telecine speed or frame sequence again it will generate a 'Lock Entry ' packet which will start a new event (if Key-Log is configured for Rolling Start mode.)

Check the 615 Help message before you stop the telecine to see what the probable cause of the lock exit is. Check to make sure that the Frame LED on the 4025 is on steady. If it is not, then you need to perform the checks outlined in section 2.10 (for Rank telecines) or 2.11 (for BTS telecines.)

Another common cause of lock exit errors is the failure to perform the centering function when you load a new piece of film. Put the 4025 in the KKJAM NEVER mode and see if the problem persist. If it does, you may not be centering the film when you load a new roll of film. See the answers to question 5 above.

You can also check the SCANTRACK range by using the KKSTATS display. See section 3.8 in the 4025 manual for information on how to access the DEBUG menu. Section 3.11.3 of the 4025 manual gives a detailed explanation of the KKSTATS display.

The 4025 thinks that there has been a splice in the film. This could be because of a centering problem or an incorrect head offset. See the answers to question 5 above.