Honda CB125 CB160 (1972) [112/139] Fig 5 89

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5 ELECTRICAL PARTS 106 d In case of improper contact described in section B confirmation of O ring damage should be made It is advisable to employ liquid sealer together with the 0 ring after cleaning the interior TAILLAMP BULB 5 6 Safety parts A Circuit For SPEEDOMETER GEAR BOX the circuit refer to the section on electric distribution Fig 5 89 TAIL LAMP LENS B Horn Fig 5 89 Parts of main safety units There are three types of electrical diaphragm horns flat spiral and long pipe types The principle is the same in each horn In Model CB 125 and CB 160 the spiral type horn is Refer to Fig employed 5 91 Construction and principle of horn As shown in the figure if the horn button switch S is closed current is fed from terminal A to con tact D point and B which comes armature G out and excites at electromagnet terminal depresses E C Thus insulator H it by and draws tripping contact point B and disconnecting at current C and D Then axis rod F to which G is installed is pushed up by plate spring P and S closes again current isfed the operation mentioned above is then re peated As the result diaphram P and resonator Q which support F vibrate and generate sound Screw I adjusts volume By turning the screw I the position of J supporting the contact points is vertically changed and the distance in which G moves is changed prior to the opening of contact point B The amplitude of P and Q is changed and the sound volume is cont rolled Refer to Fig 5 91 The spark suppressor at contact point B is not em Fig 5 91 Horn construction ployed in the small type horns of two wheel vehicles The volume of sound sound pressure does not change corresponding to current shown in the figure on the left Hence even if the adjustment is per formed in the direction in which the current Is in creased at a certain point only current is increased and sound quality is lessened However the volume of sound does not increase Hence it is desirable to limit the volume and maintain a small current When sufficient sound is generated proper adjustment has been performed When horn volume is natural the current will match the standard value Refer to Fig 5 92 Relation between voltage and current Fig 5 92

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