Icom IC-751 [32/37] 2 built in power supply unit

Содержание

• Ic 75h 1
• Ic 75h 2
• General 4
• Receiver 4
• Section 1 specifications 4
• Transmitter 4
• All band all mode all solid state 5
• Dual vfo 5
• General coverage receiver capability 5
• Memories 5
• Other features 5
• Outstanding receiver performance 5
• Section 2 features 5
• Transmitter 5
• 1 unpacking 6
• 2 recommendations for 6
• 3 power supply 6
• Be sure to read the following instructions carefully before operation 6
• Installation 6
• Section 3 installation 6
• 10 headphones 7
• 4 antenna 7
• 5 ground 7
• 6 microphone 7
• 8 cw key 7
• 8 rtty 7
• 9 external speaker 7
• 1 front panel 8
• 11 cooling fan 8
• By the monitor curcuit the fan will operate during both 8
• Cause of the overheating before starting to transmit again 8
• Cooling but with 200 watts input the final stage produces 8
• If the temperature rises to a danger limit 90 c the fan 8
• Mit modes 8
• Of the final stage the fan operates as follows 8
• Overheating i e antenna mismatch etc and correct the 8
• Perature monitoring circuit which monitors the temperature 8
• Plug inserted completely only the headphone works 8
• Power is reduced to 50 watts investigate the cause of 8
• Prolonged transmissions the fan is connected to a tem 8
• Quite a bit of heat and its temperature may rise during 8
• Section 4 operating controls 8
• The fan does not operate both in the receive and thans 8
• The headphone will lose the sound on one side with the 8
• The rear of the pa unit is designed to provide for adequate 8
• Transmit and receive to provide additional cooling 8
• Using a tape recorder connected to the headphone jack 8
• When the temperature rises to a point 50 c detected 8
• Will run much more rapidly at this time the output 8
• With a stereo headphone set inserted this way however 8
• 2 top cover 13
• 3 rear panel connections 13
• And attenuator are removed from the circuit and incoming 13
• Anti vox circuit with this control along with the vox 13
• Anti vox control 13
• Attenuation 13
• Calibrates the marker frequency with a standard frequency 13
• Controls the audio level of the monitoring ssb or cw side 13
• For normal operation leave this switch in the off 13
• Gain control so that the vox circuit only operates by the 13
• In vox operation the vox circuit may be operated by 13
• Marker calibrator 13
• Marker switch 13
• Monitor level control 13
• Operator s voice not by sound from the speaker 13
• Position 13
• Preamp att attenuator switch 13
• Put in the rf circuit and provides higher sensitivity 13
• Quency is available on every 10khz 13
• Signals will be fed to the receiver directly 13
• Sound from the speaker causing a switch to transmit this 13
• Such as the wwv 13
• Switches rf preamplifier and attenuator in the rf circuit 13
• The attenuator into the circuit this gives about 20db 13
• The switch in the pre position and the preamplifier is 13
• This removes the preamplifier from the circuit and inserts 13
• Tone when the monitor switch on the front panel is 13
• Trouble can be prevented by adjusting the input level of the 13
• Turned on adjust the control for comfortable monitoring 13
• Turns the marker circuit on or off the marker fre 13
• Very strong signal set this switch in the att position 13
• When nearby signals interfere with reception or receiving a 13
• When the switch is in the off position both preamplifier 13
• When using a small antenna or receiving a weak signal set 13
• 1 how to tune 15
• Section 5 operating instructions 15
• N n n 1 19
• 2 memory channel operation 20
• 3 tuning by up down buttons on 22
• The microphone 22
• 4 scanning operation 23
• 5 ssb operation 24
• 6 cw operation 26
• 7 rtty operation 27
• 8 am operation 28
• 9 fm operation 28
• 10 general coverage receiver 29
• 11 other operations 29
• 1 installation of optional filter 31
• Section 6 option installation 31
• 2 built in power supply unit 32
• Ic ps35 32
• Ic ом 37

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2 Tilt the units back toward left being careful not to damage the sockets and plugs that are installed on the units 6 2 3 ASSEMBLY PROCEDURE Q Turn the transceiver upside down Remove the PLATE A attached to the rear panel by unscrewing four screws These screws will be used later 3 The position for the filter is shown as OPTION FILTER on the MAIN unit board The holes for mounting the legs and the leads of the filter are pre drilled Be sure to orient the filter so that the label on the top of the filter is facing the same direction as the other filter already mounted Insert the filter flush with the board bend the leads and legs flush with the op posite side of the board and solder them in Trim the leads even with the solder points This completes the installation Replace the units with the screws removed before and top and bottom covers 6 2 BUILT IN POWER IC PS35 SUPPLY 2 Attach the main unit power supply to the bottom cover with supplied screws and insulation washers At this time insert the insulation spacer between the main unit and the bottom cover UNIT 6 2 1 SPECIFICATIONS Number of Semiconductors Transistor 5 IC 2 Diode 4 Input Voltage 110 220V AC 50 60Hz Allowable Voltage Fluctuation 10 of input voltage suitable line voltage Input Capacity 550VA at 20A load Output Voltage 13 8V DC Negative ground Max Load Current 20A 10 mins ON 10 mins OFF Dimentions 194 W x 50 H x 186 D mm Weight Approx 2 3kg Kit Included Main Unit 1 Insulation Spacer 1 Power Socket Unit 1 AC Power Cord 1 Spare Fuse 2 Installation Screws 6 Insulation Washers 6 Pass the DC power cable attached to P1 through the hole of the AC power socket plate as shown in the illustra tion then insert the bushing into the hole Attach the AC power socket plate to the position which was attached the PLATE A before by using the screws described in so that the AC power socket is toward the bottom of the set 6 2 2 PREPARATION Before performing any work on the set make sure that the power cord is unplugged from the transceiver Remove the top and bottom covers by unscrewing the six screws each on the top and bottom and the three screws on each side while taking care not to damage the internal speaker and unplug its connector Pass the connector P2 from the power socket unit to the inner chassis through the hole of the rear chassis Then connect it with the connector P2 from the main unit of the power supply 29