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12-9-proverka-ispravnosti-funkcionirovaniya-i-vosstanovitelnyjj-remont-obogrevatelya-zadnego-stekla.html
12.9. Check of serviceability of functioning and recovery repair of a heater of back glassThe working element of a heater of back glass represents a horizontal lattice from the conducting threads pasted on the internal surface of glass. Food on a heater moves through a big safety lock from the block of the distribution of power located in a motive compartment of the car. Inclusion of a heater is made by means of the switch located on the car dashboard.
Small breaks of conducting threads of a lattice of a working element of the heater can be eliminated without dismantle of back glass.
Check
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- Include ignition and a heater of back glass.
- Press the positive probe of the voltmeter to the positive plug of a lattice of a heating element, press the negative probe to the negative plug. The device has to register battery tension, otherwise check a condition of a safety lock, the switch and a connecting electrical wiring. If tension normal, however, a part of the heater does not work. You pass to the following stage of check.
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- To measure tension during the checks described below wind the positive probe of the voltmeter with a metal foil which it is easy then a finger will directly press to conducting thread of a lattice of a heating element. Connect the negative probe of the measuring instrument to the negative plug of a lattice.
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- Measure tension in the central part of each of lattice threads. The indication in 5 — 6 V confirms serviceability of a condition of thread. The zero indication speaks about existence of break between the center of thread and a positive side of an element. Overestimate of the indication twice (10 — 12 V) happens in the presence of break between the center of thread and a negative side of an element. Serially check each of lattice threads.
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- In the absence of breaks connect the negative probe to the mass of the chassis and repeat check — indications should not change, otherwise violation of quality of grounding of a lattice takes place.
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- For localization of break press the negative probe of the voltmeter to the negative plug of a lattice of a heating element. The positive probe which is wrapped up by a foil begin to probe conducting threads of a lattice, moving from giving of food to weight. In a break point instrument reading has to reduce from several volts to zero.
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Recovery repair
Restoration of integrity of conducting threads is made by means of a special remnabor of the Dupont 4817 type. The basis of set is made by the conducting epoxy paste delivered complete with a hardener.
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- Before starting recovery repair of a lattice of a working element switch off a heater and let's an element cool down within several minutes.
- Slightly smooth out the damaged site of thread felt, then carefully wipe it with alcohol.
- Paste two strips of an adhesive tape along the site of thread which is subject to restoration.
- Carefully mix epoxy paste with a hardener (follow the instructions enclosed in set).
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- Apply the received structure on the damaged site (with an overlap approximately in 20 mm on edges of the intact thread).
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Final polymerization of a compound happens in 24 hours after which protective strips of an adhesive tape can be removed from glass.
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