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Фрагмент инструкции
Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation, e) If the product has been dropped or damaged in any way, and f ) When the product exhibits a distinct change in performance - this indicates a need for service. 22) Replacement Parts - When re placement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. 3 23) Safety Check - Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. 24) Wall or Ceiling Mounting - The product should be mounted to a wall or ceiling only as recommended by the manufacturer. 25) Heat - The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat. Note to CATV system installer This reminder is provided to call the CATV system installer's attention to Section 820-40 of the NEC which provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical. POWER SUPPLY REPLACEMENT Replace defective power supplies only with parts specified by the manufacturer. Figure A Example of antenna grounding as per National Electrical Code, ANSI/NFPA 70 4 Things to watch for: No picture … Verify that the video source is on and is producing a video signal. Check that the TV and the modulator are tuned to the same channel. For example, if the modulator is broadcasting on UHF channel 16, make sure the TV is on UHF 16 rather than CATV 16. UHF 16 and CATV 16 are at different frequencies. Weak ChannelPlus UHF channel … If the TV has a separate UHF input, be sure that it is connected. LEDs blink ... You need to have one unused channel space between channels. The display will blink if you have made an ‘illegal’ choice. See the section on programming. Herringbone interference on ChannelPlus channel (diagonal lines) ... You may have chosen a channel number that is not completely vacant. Distant UHF stations may be un-watchable, but will cause interference if you try to create a new channel at the same frequency. Also, cable companies often have extra signals where there should be none. Try moving the ChannelPlus channel to another number. You may have to add a low pass filter to remove cable company noise. Herringbone interference on many channels (disappears when you remove the modulator) … The high output of the ChannelPlus modulator can overdrive many RF amplifiers. Reduce the RF output using an attenuator. (ChannelPlus coax panels are designed to take the full output of these modulators.) Audio volume is low … The left and right audio inputs are combined for monaural. For proper audio level, both right and left inputs must be used. If you have a mono source, connect it to both right and left inputs using an RCA ‘Y’ connector. No color on ChannelPlus channels … You may have chosen the incorrect cable standard. Not all televisions can accommodate the 1.25MHz frequency difference between the H and I cable standards. See the section on programming. Changing modulation standards Cable HRC and IRC considerations Most cable services use IRC frequency assignments. This is the default for the ChannelPlus 5500 series modulators. However, if the cable service uses HRC or the TV appears to search for the "house channels," the modulator can be reprogrammed to use HRC assignments by entering the number “ 98”. Set to IRC by entering a “99”. Both of these settings are only used for setting HRC/IRC. Note: This setting can be entered on any modulator channel, A, B, C, or D, and affects all channel assignments for that unit. Cable channels must either be all IRC or all HRC. 9 If an error has occurred or an incorrect channel is entered, the LED will flash quickly for a second and return to the previous settings. If two adjacent channels are selected, the unit will accept the entry but will blink the LEDs of channels that are too close. If this happens, re-program one of the channels to move it away from the other. To readback modulator C channel assignment (example: C has been programmed to channel 108) Hold button down for 5 seconds, then release. program LED blinks 1 time and pauses LED blinks 8 times LED blinks times, pauses (“10” is read back as 0) 10 Press button until channel LED is on select C select program A B C D select program A B C D select program A B C D select program A B C D select program A B C D Valid Channels: Channel Spacing: Error indication: Channel number readback: 14-64: UHF ...
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