Zenith XBV613 Service Manual - Page 98

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION 2. Essential Check and Repair Recording density of the video is far higher than the audio. Therefore video parts are very precise so as to allow only error of 1/1000mm or so in order to maintain compatibility with other videos. If one of these parts is polluted or old, same phenomena will appear as they are damaged. To maintain clear screen, regular check, replacement of old and damaged parts and oil supply, etc are essential. 3. Regular Check and Repair Check and repair schedule is not constant since they vary depending on method that the consumer uses video and environment where the video is installed at. However, for the video used by common household, good screen will be maintained if regular check and repair per 1,000 hour is performed. The following chart shows relationship between using time and checking time: Table 1 Time Requiring Checking About 1 year About 18 months About 3 years Average hours used per day One hour Two hours Three hours 4. Tools for Check and Repair (1) Grease: Floil G-3114 (KANTO) or equivalent grease (Green) (2) Grease: Kanto G-754, PL-433 (Yellow) (3) Alcohol (Isopropyl Alcohol) (4) Cleaning Patch (cloth) 5. Maintenance Process 5-1) Removal of Foreign Material (1) Removal of foreign material from video head (Fig. C-9-4) Firstly try to use a cleaning tape. (1) Use a cleaning patch if foreign materials are not removed with the cleaning tape due to severe dirty of the head. Soak the cleaning patch in alcohol and put it to the head tip. Smoothly turn the drum (turning cylinder) to the right or left (In this case, the cleaning patch must not be moved vertically). (1) After completely drying the head, test the traveling status of the tape. (1) If alcohol (Isopropyl Alcohol) remains at the video head, the tape may be damaged when this solution touches with the head surface. Never use a cloth bar (commercial sale) (2) Wipe the tape transport system and the drive system with the cleaning patch soaked in alcohol (Isopropyl Alcohol) when removing foreign materials from them. 1) The part touched with the traveling tape is called as tape transport system. The drive system consists of parts to travel the tape. (2) 2) Care must be exercised so that unreasonable force to change the pattern will be applied to the tape transport system during removal of foreign materials. Drum (Turning Cylinder) Cleaning Patch (Cloth) Soak alcohol (Isopropyl Alcohol). Head Tip Smoothly turn the drum (turning cylinder) touching the soft surface to the head tip surface. Fig. C-9-4 4-20