Simrad AC12 Manual de usuario descargar pdf (Pagina 5)

P874E

5 RECORDER UNIT

The signals from

the RECORDER DRIVER 0610

of the

IF~ FI L TER

pcb are applied to the RECORDER

AMPLIFIER

0321-

322 via pin,P302~

6. The amplified sjgnals,

are brought: In addition

, the following should be noted:

out to the recording stylus via

, the

potentiometer R325,

; -

repairs are mainly based on unit replacements

adjusting the writing intensity.

~tock ,

numbers of electrical components/units are

given

in the enclQsed parts lists

stock numbers of

mechanical units/parts for the recorder

unit are given on drawing no.

1\11401.

6 RECORDER MOTOR R~GULATOR printed circuit

board 514-

201 , ref~r:

tocircuit

diagram no. 519-

1030 '

The SIMRAD

E~recorderunit

is driven by a 36V dc

motor

M301 with a built-

in tachoge,nerator (GT), which supplies

the signal required to maintain constant speed of rotation.

An adjustment can be made with the potentiometer.R305.

The ac tacho signal is rectified by the diode bridge

D301

before being applied across R305-

306 and from there fed

through the comparator circuit D304-

0301-

0302. In the

comparator stages 0301 and 0302

, the dc-component of

the rectified tacho signal will be amplified

, whereas the

, sawtoothed

ac-component will remain unchanged by heavy

feedback. When the dc-

level at the output

of 0302 varies

, a

smaller

or'

larger part of the ac-component will exceed the

threshold level of the first stage of the dc-amplifier 0303-

304-

305-306-307, thereby changing the duty cycle of the

current pulses driving the recorder moto~. The square pulse

output passes through the choke L303,

which secures approx-

imately constant armature current.

3. SERVICE

1 GENERAL

If trouble should occur in the SIMRAD EN

Navigation,

Sounder, always attempt to isolate the fault

by a quick

operational and visual check. Make

sure that any apparent

trouble is actually due to malfunction in the equipment

and not improper control settings, mains failure

, damaged

transducer or similar

causes.

Note that replacements and adjustments described in the

operator

s manual are not included in this publication.

2 ORDERING PARTS

Apart from the stock number and a description of the

re-

6 TROUBLESHOOTING CHART

SYMPTOM POSSIBLE CAUSE

Echo Sounder is turned on through

GAl N CONTROL S1O1,

but does not operate

quired component

, remember to include the name of the

equipment

, type designation and serial number

3 REPLACING PARTS

: The printed circuit boards are

intended for unit replacements,

i whereas associated components such as potentiometers etc.

may be subject to induvidual replacements.

Checking printed

circuit boards

It is preferable to check the pcb'

s by substitution

, but if not

on hand

, an amplifier voltmeter and an oscilloscope is

re-

quired in order to check

signals/voltages as indicated in the

test tables.

Motor brushes

Access to the brushes is

achieved by loosening the

motor

cover and pushing it

forwCird. For access to the

brush on the

inside the motor must be loosened and

given approximately

half a turn.

4 ADJUSTING THE MOTOR SPEED

A fine adjustment of the motor speed can be made with the

screwdriver potentiometer R305 on

the motor regulator

pcb 514-201. The adjustment is carried out either by count-

ing the number of revolutions of the pen belt (240 or 24 per

, minut~) or

checking the time interval between transmitter

pulses by means of a,

timer-counter or an oscilloscope. A

suitable checkpoint is terminal no. 9 on the terminal strip

, E1 01. The

time interval between pulses should be 250

milli-

secondswith the range selector in the high speed position.

The low speed will automatically be correct

when the high

speed has been set (2500 ms

interval).

5 LUBRICATION

If required, use silicone grease on gear and

worm wheels

and a drop of thin oil on bearings

, for instance "

Three-in-

one" oil.

REF. TEST TABLE (3.

Mai ns

not applied

Fuses blow

Ma,ins switc::h 5.101 damaged,

Poor contracts recorder unit/cabinet

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