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    SERVICE MANUAL

    H. F. TRANSCEIVER

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    BD. *t1

    2

    DESCRIPTION

    LOW PaSSFilter ModuleT/R Relay

    2nd MixerV C 0

    High Pass Filter ModuleUp-ConverterTransmit Exciter

    Digital Control2nd lF AudioPassband Tuning Referen ce

    IFSelectivity

    IFSwitching or NoiseBlanker

    TranslatorRIT8PTO SwitchinclCircuitry

    Power Amplifier ModulePTO

    AUX-7 Connector

    PowerSupply R egulator

    ASSY.17.18.19.20

    Part of LOW Pass

    Filtern

    F I ~ 3

    TR7 Module Locations

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    Fig. 2 1 Parent Board Pictorial (Top View)

    (SeePage 2 6 forCircuitSide)

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    Fig. 2-3 Parent Board Pictorial (Bottom View)

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    Fig. 2-5 Digital Control Board Pictorial

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    Fig. 2-9 Up-Converter Board Pictorial

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    Fig. 2-11 VC Board Pictorial

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    TEST P

    49

    Fig. 2-13 Translator Board Pictorial

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    Fig. 2-15 2nd Mixer Board Pictorial

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    Fig. 2-17 IF Switching Board Pictorial

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    rork clen omr

    Fig. 2-19 IF Selectivity Board Pictorial

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    Fig. 2-21 P TIReference Board Pictorial

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    Fig. 2-25 2nd IFI udio Board Pictorial, Version 2

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    Fig. 2-23 2nd IF Audio Board Pictorial Version 1

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    Fig. 2-27 Jumper Board Pictorial

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    Fig. 2-29 ALC Board Pictorial

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    Fig. 2-30 High Pass Filter Parent Board Pictorial

    2-83

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    Fig. 2-31 High Pass Filter Switch Pictorial (Front Rear)

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    Fig. 2-33 Low Pass Filter Board Pictorial (Bands 1 -4

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    Fig. 2-34 Low Pass Filter Board Pictorial (Bands 5-8)

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    Fig. 2-35 Low Pass Filter Switch Pictorial (Front Rear)

    2

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    Fig. 2-37 Power Supply Board Pictorial

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    R ? U>

    Fig. 2-39 Power Amplifier Module Pictorial wlPredriverBd. l )

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    Fig. 2-40 Predriver Board2

    Pictorial Schematic

    2-122

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    2-18. PTO 3. Remove the top two screws on each side

    The Permeability-Tuned Oscillator (PTO)provides a5.05-5.55 M z injection signal to the synthesizercircuitry of the TR-7. The VC0 (Section 2-5 tracksthe frequency of the PTO, thus allowing the

    operator to tune through any500

    kHz range via thefront panel tuning control. The PTO has been verycarefully calibrated and temperature compensateda t the factory, and anv attemvt a t remir or revlace-

    holding the front panel to the side rails, andloosen the bottom screws.

    4. Remove the bandswitch knob.5. Remove the two screws holding the band-

    switch shaft detent to the rear panel and slide

    .the bandswitch to the rear just enough to clearthe front panel.

    6. The front panel will now hinge down, exposingL^ lpn

    u r LV.ment of components ki ll ver; like?; destroy the

    7 Refer to figure 2-43 and identify the wrenchcalibration

    andlor

    compensation. I t is highlyrecom- access hole in the rear of the PTO cover. Insert

    mended. therefore. that any PTO which requiresat- a long (at least 3") 3/32" ALLEN wrench

    tention be returned to the factory for proper repair. stra ight through this hole, seating the wrenchin the ALLEN set screw which serves as theshaft bearing. The proper wrench is available

    I t is possible to adjust the knob torque required to from the factory. Be sure to insert the wrenchtune the PTO, should this become necessary. This is straight through the access hole. to avoidaccomplished as follows:

    damaging any components inside the PTO.8. Carefully adjust the set screw for the desired

    knob torque. Overtightening the adjustment1 Remove the two plastic end caps from the sides screw must be avoided to prevent bearing

    of the front panel. Note that these caps are not damage.identical: there is a right and a left end cap. 9. Reverse the above procedure to reassemble the

    2. Remove the DR7,if installed. (See Section 4-1). TR-7.

    Wrench Access

    Hole

    Fig. 2-43 PTO Torque Adjustment

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    Fig. 4 1 DR7 Removal

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    Fig 4-2 DR7 Board Pictorial

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    Fig. 4-4 AUX Board Pictorial

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    TEST

    POINT

    Fig. 4-6 NB-7 Board Pictorial, Version 1

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    TEST PO NT

    Fig 4-8 NB-7 Board Pictorial, Version 2

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