Intek M-490 Plus Bedienungsanleitung

Model No: 3390 Drawring No:

Customer :

Model No:

M-490 Plus Rev,Date:

M-490 Plus

Service Manual

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Title

M-490 Plus Rev,Date:

Table of Contents

Page

Specifications 3

Test and Alignment Procedure 4

BlockDiagram 14

SchematicDiagram 15

PrintedCircuitBoard 25

Channel Frequency Charts 26

PartsList 38

Semiconductor Voltage Chart 48

Semiconductor Lead Assignment and Block Diagram 55

Exploded View Parts List 58

Exploded View 60

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SPECIFICATIONS

1. GENERAL

Channels………………………...…………………………….................. 400 Ch AM/FM 4W

Frequency Range………………………………...……………… ..25.615 to 30.105 MHz

FrequencyControl……………………………………………………..…………..………PLL

Operating Temperature Range……………………..…………………………-10°/ +55°C

DC Input Voltage…………………………...……………………………....13.2 V DC ±15%

Size………………………………………….……………….…180(L) X 50(H) X 153(D) mm

Weight………………………………………………………………..……...…………0.850 kg

2. RECEIVER

Receiving System………………………………....Dual Conversion Super Heterodyne

Intermediate Frequency………………………….…1st IF: 10.695 MHz, 2nd IF: 455 MHZ

Sensitivity………………………………………...….0.5 µV for 20 db SINAD in FM mode

Audio Distortion……………………………………..…………….Less Than 8% @ 1 KHz

ImageRejection………………………………………………………………………...65 dB

Adjacent ChannelRejection…………………………………………………………....65 dB

Signal/ Noise Ratio…………………………………………………………………..….45 dB

Current Drain at standby……………………………………………………………..325 mA

3. TRANSMITTER

Output Power……………………………………………………..……...….4W @ 13.2 V DC

Modulation……………………………………………………...………FM: 1.8 KHz ±0.2 KHz

Frequency response………………………………………………...From 400 Hz to 2.5 KHz

Output impedance…………………………………..…………………RF 50 ohm Unbalance

Signal/ Noise Ratio…………………………………………………………………..40 dB MIN

Current Drain…………………………………………………………………….…….1300 mA

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OPERATION INSTRUCTIONS

Having properly installed your batteries and hooked-up the antenna, you are now ready to operate your

radio for optimum reception and voice transmission.

Turn the power “ON” with ON/OFF switch.

Set the desired channel.

Adjust the squelch control knob to reduce any undesirable background noise when no signal is being

received. To do this, select a channel where no signal are present, or wait until signals cease on your

channel. Then, rotate the squelch control knob clockwise to a point where the background noise

disappears.

Note: When the squelch is set properly, the speaker will remain quiet until a signal is

received. In order to receive weak signals, do not set the squelch too high.

Adjust the volume to the desired listening level.

To Transmit

Press and hold the push-to-talk button. Speak slowly and clearly in a normal voice two to three inches

from the microphone. A buit-in modulation control circuit will automatically adjust the microphone input

level. There is no need to speak loudly.

To Receive

Release the push-to-talk button.

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THEORY OF OPERATIONS

TRANSMITTER

A. RF Amplification

The output of double AMP Q301 is fed through tuning IFT L301 and L302 to the base of pre driver AMP

Q302. The output is then supplied through tuning circuit L303 to RF driver AMP Q303. The output of

Q303 is supplied with tuning circuit L304 and C317,C315,C21 and goes to the base of final RF AMP

Q304. The output of Q304 is supplied to the antenna through L-C tuning circuit.

B. Circuit for Suppression of Spurious Radiation

The tuning circuit between the output of final AMP Q304 and antenna, 4-stage “PHI” network L308,

C324, C1, C327, L311, C337, C333, L312, C328, C334, C338, L313 serves as a spurious radiation

suppressor . This network also serves to match the impedance between TX power AMP Q304 and the

antenna.

C. Circuit for Limiting Power

After finished all alignment, the constant voltage supply circuit limits the available power 4 W or slightly

less. RV1 and corresponding three transistors control supply voltage of RF amplifier and other circuits.

Tune all the trimmer parts for maximum indication of RF power meter and adjust RV1 to make 4 w

indication of RF power meter.

The tuning is adjusted so that the actual power is from 3.8 to 4.0 W. There are no other additional

controls for adjusting the TX output power.

D. Modulation Control

a. FM

The mic input is fed to mic audio amplifier IC KIA324 which drives modulation varicap diode

D403 in the VCO circuit. RV401 limits the incoming modulation audio levels to inhibit over modulation.

While reading the modulation factor on the modulation analyzing equipment, adjust

RV401 shall not exceed +-1.8 KHz/Dev. After 20 dB up from 1.25 KHz/1.2 KHz/Dev. Audio level

b. AM

Modulation signals are filtered with RC network and goes to the audio power AMP IC IC103 to make

nominal signal level to achieve wanted modulation. To control incoming audio signal, diode D203 and

corresponding ALC circuit limits the modulation shall not exceed +/-80% adjust RV201 +/-80%

modulation under 1.0 KHz AF 60% mod plus 20 dB of audio signal.

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E. Receiver

CB receiver is dual conversion supper-heterodyne type with the first IF 10.695 MHz and second IF 455

KHz. Receiver is separated two blocks, 1st IF section and 2nd IF section.

The PLL synthesizer supplies first local frequency 16.270 ~ 16.710 MHz.(for EU) and 16.90625 MHz ~

17.29625 MHz (for UK) With the provided first local frequencies Q105,Q106 mixes the incoming RF

signal to generate first IF signal. Mixed signals were filtered with the XF101 (10.695 MHz) crystal filter

and other tuning circuits. Output signal of mixer is filtered with CF101 (455 KHz ceramic filter). The 455

KHz signal from the 2nd IF filter was amplified and limits internaly. After amplification the signals fed the

quadrature detector loop L104. Then we can see the recovered audio signals on Pin 11 for FM of

IC102. With the amplitude of recovered signals, Q112 serves as an audio amplifier. For AM signal Will

be pass filter CF101 and induced to Q116, Q117 respective and detected to voice signal by D111.

TROUBLESHOOTING HINTS

Symptom Probable Cause Remedy

Unit does not

work at all

•Defective power switch VR102.

•Blown fuse.

•Broken DC power cord.

•Defective IC101.

•Replace

No output from

speaker at all

•Defective external speaker jack.

•Poor connection on microphone connector

•Defective push switch on microphone.

•Defective internal speaker.

•Defective VR102, IC103 other components.

•Repair or replace

•Replace

•Replace the defective

components.

No noise on

speaker

•Measure all the voltage of IC102 with voltage

chart

•Defective squelch circuit components (RV102,

VR108, IC102)

•Replace

Squelch does not

work

•Defective VR108, RV2, IC2.

•Replace the defective

components.

•Re-adjust

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No modulation

•Defective microphone.

•Poor audio output and defective modulation

microphone amplifier components (IC103).

•Defective microphone connector components.

•Defective ALC circuit D413, D414.

•Replace

•Replace the defective

components.

•Replace

•Replace the defective

components.

LCD meter does

not work

•Defective D5.D3

•Defective IC101.

•Defective RV101.RV202

•Replace

LCD display does

not work

•Defective RED wire fuse.

•Defective IC101, Q415.

•Replace

Channel selector

does not work •Defective IC101, SW105. •Replace

EMG CH9.19

does not work

•Defective EMG SW.

•Defective IC101.

•Replace

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ALIGNMENT PROCEDURE

Step Setting Connection Adjuster Adjust for

Frequency adjustment

MIC : Receive

Volume : optional

Squelch : optional

CH selector : 19 EU

CH9 : off

Frequency counter

to dummy load

(Figure 1).

CT201 27.185MHz±300Hz

VCO Voltage

adjustment

MIC : Receive

Volume : optional

Squelch : optional

CH selector : 1A

CH9 : OFF

Connect DC

voltmeter between

R406, C411 and

GND.

(Figure 2).

L501 1V at TX.

Figure 1 Figure 2

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TRANSMITTER SECTION

Test Equipment Required

•RF power meter (RF SSVM) •DC power supply (13.2 volt, 3 amp)

•50 ohms dummy load (non-inductive) •Spectrum analyzer

•RF attenuator (50 ohms non-inductive) •Frequency counter

•Oscilloscope •Coupler

•Audio generator

ALIGNMENT PROCEDURE

Step Setting Connection Adjuster Adjust for

RF power stage

MIC : Transmit

Volume : optional

Squelch : optional

CH : selector : 19

CH9 : OFF

Connect dummy load

and RF power meter to

the EXT-ANT jack on the

set (Figure 3).

L301

L302

L303

Maximum indication

on the power meter (4

watts). If indication is

not in 4 watts range,

adjust L301, L302,

L303.

Second harmonic

check

MIC : Transmit

Volume : optional

Squelch : optional

CH : selector : 19

CH9 : OFF

Connect RF power meter

With dummy load to

spectrum analyzer

through coupler /-40 dB

Attenuator to EXT-ANT

jack on the set

(Figure 4).

At no modulation,

compare the level o

fundamental

frequency to the level

of harmonic

frequency.

Suppression of the

2nd harmonic

frequency level must

be lower than –60 dB.

Check for the other

channels.

Frequency check

MIC : Transmit

Volume : optional

Squelch : optional

CH : selector : 19

CH9 : OFF

Connect dummy load

and frequency counter

though coupler to RF

powermeter. Connect RF

powermeter to EXT-ANT

jack on the set

(Figure 5).

CT201 Be sure that the

indication of the

transmitter frequency

is 27.185MHz±300Hz

on the frequency

counter.

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TX power level

adjustment

Volume : optional

Squelch : optional

CH : selector : 1

CH9 : OFF

Connect dummy load

and oscilloscope through

Coupler to RF

powermeter connect

audio generator to

microphone jack

(Figure 6).

RV202 Adjust until the 5th bar

appears on the

channel display LCD.

Figure 3

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