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SERVICE —

The Service Technical Department of the Motor Accessory

Division will be pleased to advise on any functional problem

relating to instruments and equipment described in this brochure.

All correspondence should be addressed to: SMITHS MOTOR

ACCESSORY DIVISION,

EXPORT SERVICE,

CRICKLEWOOD WORKS, LONDON NW2,

ENGLAND.

Enquiries will be dealt with promptly.

Printed in England by Roadcraft Press Ltd, London NW2

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Содержание RVI.1000 SERIES

Страница 1: ...SMITHS SERVICE INSTRUCTIONS IMPULSE TACHOMETER RVI 1000 SERIES SMITHS M O T O R A C C E S S O R Y D I V I S I O N ...

Страница 2: ...any functional problem relating to instruments and equipment described in this brochure All correspondence should be addressed to SMITHS MOTOR ACCESSORY DIVISION EXPORT SERVICE CRICKLEWOOD WORKS LONDON NW2 ENGLAND Enquiries will be dealt with promptly Printed in England by Roadcraft Press Ltd London NW2 ...

Страница 3: ...t of Special Tools Equipment S 2 General Technical Description S 3 Testing Procedure S 4 Dismantling Instructions 3 6 Inspection Cleaning S 6 Assembly Instructions S 6 S 7 Calibrating Instructions S 7 S 9 Symptoms Faults Treatment S 12 S 14 S 1 ...

Страница 4: ...LIST OF SPECIAL TOOLS EQUIPMENT Description Code No Speedometer Test Apparatus SR D 221 Adaptor for use with Apparatus SR D 221 SR D 312 OR Speedometer Test Apparatus AT 9034 Adaptor for use with Apparatus AT 9034 SR D 313 Ignition Pulse Simulator SR D 347 Generator TV 1100 00 Bridge Spanner SR D 360 Bezel Fixture SR D 140 Bezel Spinning Tool SR D 269 Support Pad SR D 269 13 Pressure Pad SR D 269 ...

Страница 5: ...th No current flows through the meter M The primary of the triggering transformer T is connected in series with the primary of the engine ignition coil so that when the contact breaker in the engine distributor closes the current flowing to feed the ignition coil passes through the primary of the transformer energising the core When the contact breaker opens to provide a spark to the engine the fl...

Страница 6: ...t in errors of up to 400 r p m being indicated on the tachometer TESTING Switch ON the supply to the ignition pulse simulator and the impulse tachometer Wait for two minutes and allow the units to warm up Start the speedometer test apparatus and operate the tachometer throughout its range Check the calibration by running the speedometer test apparatus at 3000 r p m the tachometer should read as fo...

Страница 7: ...S 5 ...

Страница 8: ...e components from the printed circuit board the minimum of heat should be used Excessive temperature will cause distortion of the board and damage the electronic components Finally prior to assembly all parts must be carefully cleaned and any foreign matter removed using a fine paint brush where necessary ASSEMBLY INSTRUCTIONS ASSEMBLY OF MOVEMENT Holding the movement by the two side members repla...

Страница 9: ...ibration mark If the pointer does not lie within the mark the movement is unbalanced and should be re poised in the following manner On the movement balance arm is fitted a moveable brass counter weight and at 90 to the counter weight are two extension arms on which is wired two small moveable coils With the tachometer reading oppositethe lower calibration mark proceed to check the tachometer at 9...

Страница 10: ...et the impulse tachometer to read 3 000 rpm and wait for two minutes to allow the equipment to stabilise Reduce the r p m of the speedometer test apparatus to 875 rpm and check that the impulse tachometer reads opposite the low calibration mark 1 750 rpm If the impulse tachometer does not read 1 750 rpm fit the bridge spanner SR D 360 to the hairspring anchor plate and rotate the plate in the desi...

Страница 11: ... correctly and that the pointer reads opposite each of the calibration marks Set the speedometer test apparatus to run at 3 000 rpm and the impulse tachometer should be reading 6 000 rpm Adjust the potentiometer L See Fig 1 on Page S 5 to reduce the speed of the impulse tachometer until it reads 3 000 rpm and then switch off the supply and remove the iron core former and pulse lead The tachometer ...

Страница 12: ...ng attachment tightly to the support so that the wheel is almost touching the bezel Turn the table by means of the ratchet arm slowly tightening the feed screw at the same time This should be continued until the bezel has been spun over if necessary adjusting the height of the spinning attachment Slacken the feed screw and centre clamp screw then remove the instrument After spinning proceed to com...

Страница 13: ...Fig 3 Printed Circuit Board Diagram Fig 4 Ignition Pulse Simulator SR D 347 S 11 ...

Страница 14: ...ration of the Tachometer as described under calibration instructions on Page S 7 Check poising as described on Page S 7 Check positioning of pointer on movement spindle and refit if necessary Poise and recalibrate Remove suspect movement and replace with a good one and check the Tachometer Poise and recalibrate If C2 has a low capacitance replace component No Reading Poor Connections Pointer Loose...

Страница 15: ...istance between A G On adjusting R8 the resistance should vary between 6K and 22K The value of R5 should read 5K With the supply ON check the voltage across C1 This should be at zener potential approximately Check for short circuit Replace if necessary With the supply OFF check the resistance between A and the left hand of C1 This should be 1320 ohms 1080 ohms With the supply OFF check R7 between ...

Страница 16: ... and 423 ohms With the supply ON measure the voltage at E If the voltage is less than 0 2 volts proceed to check TR2 If it is greater than 0 2V the fault lies in TR1 R4 R5 R6 or R8 With the supply OFF check the resistance between E 6V terminal This should be 750 900 ohms With the supply OFF check the resistance between A G On adjusting the potentiometer the resistance should vary between 6K and 22...

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