For removal of a combination of devices preliminary remove facing, having turned away four screws. Then turn away four screws of fastening of a combination; separate electric sockets and remove a combination of devices. Repair of a combination of devices make block replacement of faulty devices. For replacement of devices remove protective glass and on an underside turn away a nut of fastening of the faulty device.

Speedometer

In a combination of devices the electronic speedometer with the step-by-step electric motor is established. The speedometer consists from стрелочного the index of speed, the counter of the passed way and the daily counter of the passed way. The daily counter has the button of dump of indications. The speedometer works complete with the electronic gauge of the Hall established on a transmission. At movement of the car the gauge is resulted in rotation from a gear wheel of a secondary shaft of a transmission. For one turn of a shaft of the gauge 6 impulses of an electric current are developed. These impulses arrive in a speedometer microcircuit, will be transformed and arrive on the microampermeter which specifies speed of the car, and in the step-by-step electric motor which rotates барабанчики indexes of the passed way.

Fig. 9.51. The electric scheme of check of a speedometer: 1 — a socket штекерный ХРЗ combinations of devices, 2 — the generator of signals Г5-54, 3 — the storage battery

For check of serviceability of a speedometer it is necessary to collect the electric scheme shown on pис. 9.51. The generator of signals Г5-54 submit on conclusions № 10 and № 3 sockets ХРЗ squared impulses, positive polarity with amplitude 6+1 In duration 200—250 мкс. Accuracy of indications of high-speed knot in control points should keep within:

60 km/h — 93,7—100 Hz

100 km/h — 157,2 — 166,6 Hz

By the same principle accuracy of indications счетного knot is checked.

At frequency of 100 Hz for one minute барабанчик «Km/h» should turn on 1 figure. The error счетного knot should not exceed +1 %.

Fig. 9.52. The electric scheme of check of the gauge of a speedometer: 1 — a socket key, 2 — a socket штекерный the gauge, 3 — the storage battery, R1 — resistance МЛТ-0,25-10 a clod, V1 — light-emitting diode АЛ102

For check of the gauge of a speedometer collect the electric scheme shown on fig. 9.52. For one turn of the platen of the gauge the light-emitting diode should flash 6 times.

Tachometre

In a combination of devices the electronic tachometre for measurement of frequency of rotation of a cranked shaft of the engine is established.

The tachometre consists from миллиамперметра and the electronic scheme. The alternating voltage from the generator (undertakes to выпрямительного the block from a phase статора) arrives in the amplifier, then will be transformed in a microcircuit and arrives in миллиамперметр which arrow shows number of turns. The above frequency of rotation of the generator, the is more than alternating current impulses arrives in an electronic part, that on больший the corner deviates an arrow of a tachometre.

Fig. 9.53. The electric scheme of check of a tachometre: 1 — a socket штекерный ХРЗ combinations of devices; 2 — the storage battery; 3 — the generator of signals Г5-54

For tachometre check collect the electric scheme shown on fig. 9.53. From the generator of signals Г5-54 submit on conclusions № 1 and № 6 sockets ХРЗ squared impulses, positive polarity with amplitude 12–2 In and duration 200—250 мкс. At frequency of 240 Hz the tachometre should show 1000+100 mines^-1, and at frequency of 960 Hz — 4000 mines^-1.

The index of level of fuel

In a combination of devices the electromagnetic index of level of the fuel, working complete with the gauge established in a petrol tank is established.

The index is electromagnetic логометр with motionless measuring coils and a mobile constant magnet. The magnet is strengthened on an axis of an arrow of the index. Index coils are reeled up at an angle in 90 ° on a special plastic skeleton. A skeleton with coils and a magnet are placed in the special screen for an exception of influences on them of extraneous magnetic fields.

At current course on both coils it is created результирующее a magnetic field. A constant magnet, co-operating with a magnetic field of coils, it is established in the position depending on a direction of this field. The direction результирующего a magnetic field depends on change of the relation of currents in coils which is defined by size of resistance of the gauge depending in turn from quantity of fuel in a tank.

Pис. 9.54. The electric scheme of check of the index of level of fuel: 1 — a socket штекерный ХРЗ combinations of devices; 2 — the storage battery; 3 — a socket штекерный ХР1 combinations of devices, 4 — the switch, R1 — resistance МЛТ-2-330 the Ohm, R2 — resistance МЛТ-2-120 the Ohm, RЗ — resistance МЛТ-2-15 the Ohm

For check of the index of level of fuel it is necessary to collect the electric scheme shown on fig. 9.54. At inclusion of resistance RI, the arrow should show «0», at inclusion R2 — «1/2», and at inclusion R3 — a full tank. A deviation of an arrow from the specified divisions no more than for width of an arrow. The serviceable gauge of the index of level of fuel should have following resistance: — at completely lowered float 330+15 Ohm, and at completely lifted — 11+5 Ohm. At intermediate position of a float of 70 mm from a flange of the gauge to the bottom part of a float (gauging is carried out perpendicularly to a flange) resistance should be 118+10 Ohm.

The temperature index

In a combination of devices the electromagnetic index of temperature of a cooling liquid of the engine логометрического type is established.

The device consists of the index and the gauge established in the engine. The index device to similarly index of level of fuel, and the gauge — the semi-conductor thermoresistor sharply changing the resistance depending on changes of temperature. Change of temperature of a cooling liquid changes resistance of the gauge that causes change of a current in coils of the index and результирующее the magnetic field turns a constant magnet and an arrow in corresponding position of a scale.

The serviceable gauge at 25 ° With should have resistance 1400—1900 Ohm, and at temperature 80 ° About 200—270 Ohm.

Fig. 9.55. The electric scheme of check of the index of temperature of a cooling liquid: 1 — a socket штекерный ХРЗ combinations of devices; 2 — the storage battery; 3 — a socket штекерный ХР1 combinations of devices; R1 — resistance МЛТ-2-250 the Ohm

For check of the index of temperature of a cooling liquid it is necessary to collect the electric scheme shown on fig. 9.55.

The arrow of the index should not deviate division 80 ° With more, than for width of an arrow.

Signalling device of an overheat of the engine

In addition to the index of temperature of system of cooling the car is supplied by a signalling device of an overheat of the engine. The gauge automatically includes a lamp in combinations of devices when the temperature of a cooling liquid reaches 104—109 ° With.

The pressure index in system of greasing of the engine

The electromagnetic index is applied to the control over pressure in system of greasing of the engine логометрического type. The device consists of the index located in a combination of devices and the gauge 23. 3839. The index device to similarly index of level of fuel, and the gauge represents the variable resistance which size changes depending on position of a membrane which in turn changes the position from pressure size.

Fig. 9.56. The electric scheme of check of the index of pressure of oil: 1 — a socket штекерный ХРЗ combinations of devices; 2 — the storage battery; 3 — a socket штекерный ХР1 combinations of devices; 4 — the switch; R1 — resistance МЛТ-2-180 the Ohm; R2 — resistance МЛТ-2-60 the Ohm

For check of the index of pressure of oil it is necessary to collect the electric scheme shown on fig. 9.56. At connection of resistance R1 the index should show pressure of 1,5 kg/sm ², and at connection of resistance R2 — 4,5 kg/sm ². A deviation of an arrow from the specified points no more than for width of an arrow.

The serviceable gauge should have resistance 290—330 Ohm in the absence of pressure, at pressure of 1,5 kg/sm 2 170-200 Ohm, and at pressure of 4,5 kg/sm 2 50-80 Ohm.

Control lamp of emergency pressure in system of greasing of the engine

In addition to the index of pressure of greasing in a combination of devices there is a signalling device. At pressure decline in system of greasing of the engine from 0,4—0,8 kg/sm ² in a combination of devices the signalling device lights up. The signalling device works with the gauge of type ММ111-В. In the absence of pressure in system the gauge membrane is curved aside from contacts and the lamp lights up, and in the presence of pressure the membrane is curved in an opposite side, disconnects contacts and a lamp dies away.

The pressure index

The pressure index логометрического type, with motionless windings. The device of the index of pressure is similar to the index of level of fuel.

Fig. 9.57. The electric scheme of check of the index of pressure: 1 — an adjustable source of a direct current, 2 — the control voltmeter, 3 — a socket штекерный ХРЗ combinations of devices

For check of the index of pressure it is necessary to collect the electric scheme shown on fig. 9.57.

For the control it is necessary to use the voltmeter with a limit to 30 In a class I and an adjustable source of a direct current (for example Б5-48). Changing pressure of a source, on the control voltmeter to define accuracy of indications of the index of pressure of a combination of devices. The error of the index of pressure in points 12 and 14 In should not exceed +0,4 Century