tr7manual.pdf

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1、SERVICE MANUAL H. F. TRANSCEIVER BD. *t 1 2 DESCRIPTION LOW PaSSFilter Module T/R Relay 2nd Mixer VC0 High Pass Filter Module Up-Converter Transmit Exciter Digital Control 2nd lF/Audio Passband Tuning/Reference IFSelectivity IFSwitching or NoiseBlanker Translator RIT 8 PTO Switchincl Circuitry - Pow

2、er Amplifier Module PTO AUX-7 Connector PowerSupply/Regulator ASSY. # 17.18.19.20 Part of LOW Pass Filter n7 F I . 1-3 TR7 Module Locations Fig. 2-1 Parent Board Pictorial (Top View) (See Page 2-6 for Circuit Side) Fig. 2-3 Parent Board Pictorial (Bottom View) Fig. 2-5 Digital Control Board Pictoria

3、l Fig. 2-9 Up-Converter Board Pictorial Fig. 2-11 VC0 Board Pictorial - TEST P I / 49 Fig. 2-13 Translator Board Pictorial Fig. 2-15 2nd Mixer Board Pictorial - Fig. 2-17 IF Switching Board Pictorial rork Scle naomr m Fig. 2-19 IF Selectivity Board Pictorial - Fig. 2-21 PB TIReference Board Pictoria

4、l Fig. 2-25 2nd IFIAudio Board Pictorial, Version 2 Fig. 2-23 2nd IF/Audio Board Pictorial Version 1 Fig. 2-27 Jumper Board Pictorial Fig. 2-29 ALC Board Pictorial Fig. 2-30 High Pass Filter Parent Board Pictorial - 2-83 Fig. 2-31 High Pass Filter Switch Pictorial (Front like?; destroy the 7. Refer

5、to figure 2-43 and identify the wrench calibration andlor compensation. It is highly recom- access hole in the rear of the PTO cover. Insert mended. therefore. that any PTO which requires at- a long (at least 3) 3/32 ALLEN wrench tention be returned to the factory for proper repair. straight through

6、 this hole, seating the wrench in the ALLEN set screw which serves as the shaft bearing. The proper wrench is available . It is possible to adjust the knob torque required to from the factory. Be sure to insert the wrench tune the PTO, should this become necessary. This is straight through the acces

7、s hole. to avoid accomplished as follows: damaging any components inside the PTO. 8. Carefully adjust the set screw for the desired knob torque. Overtightening the adjustment 1. Remove the two plastic end caps from the sides screw must be avoided to prevent bearing of the front panel. Note that thes

8、e 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 Fig. 4-1 DR7 Removal Fig. 4-2 DR7 Board Pictorial Fig. 4-4 AUX7 Board Pictorial TEST POINT Fig. 4-6 NB-7 Board Pictorial, Version 1 TEST POINT Fig. 4-8 NB-7 Board Pictorial, Version 2