- The lamp does not burn at the tightened manual brake: to check up a safety lock.
- To remove and check up a lamp накаливания.
- If it has not led to success, to release the switch behind at the lever of inclusion of a lay brake, to disconnect a wire from the switch (behind near to the lever) and to bring the tip to the bared metal.
- If the lamp lights up now, means, the switch is faulty.
- The lamp does not die away at the removed lay brake: to disconnect a wire from the switch of a lay brake as it is described above, but to leave the tip to be groundless.
- If the lamp dies away, means, the switch is faulty or established incorrectly.
- If it continues to burn, means, the cable somewhere has frayed and there is a short circuit on "weight".
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