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Hallicrafters SR-2000 Repair Manual

Hallicrafters SR-2000 Manual Online:

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Hallicrafters SR-2000 User Manual
Hallicrafters SR-2000 User Guide
Hallicrafters SR-2000 Online Manual

Text of Hallicrafters SR-2000 User Guide:

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 15 WDØGOF 3/7/20014 3-4-2 Driver output test The High Voltage will remain off for the following tests. Set all controls to the standard setup condition. Power up, warm up 10 minutes. Remove the tube shield from V18 and install the capacitive pickup and connect the scope. You will be testing all bands. Adjustment of the PRESELECTOR and the driver grid and plate coils will be required for each band. The process will be: <Select band. <Preset PRESELECTOR to proper band segment. <Preset main tuning. <KEY transmitter. <Peak PRESELECTOR. <Peak driver grid and plate coils as indicat

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 3 WDØGOF 3/7/20014 TABLE OF CONTENTS INTRODUCTION .................................................................................................................................................. 2 1. SR-2000 INITIAL INSPECTION AND TESTING. .......................................................................................... 5 1-1. VISUAL AND MECHANICAL INSPECTION ......................................................................................... 5 1-2. RECAPPING; .......................................................................

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 9 WDØGOF 3/7/20014 VFO ALIGNMENT CONTINUED: 1-5-4-3. VFO ALIGNMENT 1-5-4-3-1 VFO STABILITY TEST NOTE: RIT OFF, CAL ADJ and RIT CONTROL both in center of rotation. If you have not already done so proceed to section 8-8-A of the original manual and perform the mechanical indexing adjustments before you proceed. Before starting the VFO alignment perform a VFO stability test. Connect the frequency counter to V4A pin 3. Power up and warm up for 30 minutes. Record the VFO frequency every 10 minutes for one hour. In the one h

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 12 WDØGOF 3/7/20014 2-5 AGC TEST The following agc test results are dependent upon overall gain and sensitivity of the receiver. This assumes a fully functional receiver and proper alignment. If you are in the process of restoring to operation you may not get the agc figure of merit in spec. When you have removed all the receiver and transmitter faults and have done a completer alignment you will re-run these two tests for compliance to spec. 2-5-1. AGC FIGURE OF MERIT With the ground jumper still connected to the agc line, tune the receiver to 7.250 MHz. Set the input at the

  • REPAIR AND RESTORATION OF THE SR-2000 23 WDØGOF 3/7/20014 6-2. AUDIO POWER METER SUBSTITUTE With a phone plug and a 3.3 ohm 5 watt resistor and a scope or ac voltmeter you can substitute for the audio output meter. Or you can measure the voltage across the speaker. If you use the audio power meter or the substitute in the figure below you do not have to listen to the constant tone

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 10 WDØGOF 3/7/20014 2. RECEIVER FAULT ISOLATION 2-1. EQUIPMENT REQUIRED. HF RF signal generator capable of 0.5 microvolts to 300 millivolts and covering 1600 KHZ to 30 MHZ Audio output meter (similar to General Radio 1840A). [See TECH NOTES 6-3 for substitute] Scope 100 MHZ or better with 1:1 and 10:1 probes or switchable probe. Audio oscillator with 600 ohm output Z 0 capable of from 0.7 millivolts to 30v peak to peak output. 2-2. STANDARD TEST CONDITIONS For the RECEIVER FAULT ISOLATION tests the following preset conditions are required. OPERATION REC FUNCTION LSB CAL

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 19 WDØGOF 3/7/20014 5 TX SUBSYSTEM TROUBLESHOOTING AND TESTING 5.1 CARRIER BALANCE The BALANCED MODULATOR is a very simple ckt but it is also a very difficult ckt to pinpoint faults in. Fortunately there are very few components to “guess at”. The variable cap C192 is the highest failure rate component in the ckt. Second is the diodes CR19 and CR20. These two diodes “should be a matched pair”. Great quantities of these diodes are still available and can be found for around $0.50 ea. Matched pairs go for around $30.00 a set. I purchase 10 to 15 at a time and match

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 6 WDØGOF 3/7/20014 1-4. INITIAL POWER UP Note: Initial assumption is, the power supply has been fully restored and meets original specifications. 1-4-1. TEST EQUIPMENT REQUIRED DVM or VTVM 1-4-2. POWER UP PRE-SET CONDITIONS First and of critical importance, you must have a power supply that has been tested and meets all the original specifications. You will not be transmitting power until late in this process so there is no need to activate the high voltage. The power supply front panel switch should be in the SSB LOW POWER position. Do not turn on the Hig

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 7 WDØGOF 3/7/20014 1-5-1 TEST EQUIPMENT REQUIRED Oscilloscope, 100MHz bandwidth with X1 and X10 probes, Frequency counter. 1-5-2. CARRIER OSCILLATOR: The carrier oscillator is comprised of V14A and its associated circuitry. The carrier oscillator has three modes of operation. They are: LSB, USB and USB/CW off-set. First thing is to check the output of the carrier osc in both USB and LSB modes. After warm up you should have approximately 6 vpp on pin 8 of V9A (test point D). Now adjust T4 for max. The voltage on pin 4 or 3 of T4 should be 8 Vpp. If these voltages are more than 15% low then you most likely have a fault in

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 24 WDØGOF 3/7/20014 6-99. ADDITIONAL TECHNICAL INFORMATION SOURCES: There is a wealth of technical information on the entire Hallicrafters SR series transceivers available on the WWW. Here are three of the best. http://k9axn.com/ : This site belongs to Jim Liles. Jim is the most knowledgeable person I know on the SR- 400 and the SR-2000. If you want to make your 400 a super 400 visit Jim’s site. http://www.w9wze.net/ : This site, known as the HHI site is an open to all site. W

  • REPAIR AND RESTORATION OF THE SR-2000 5 WDØGOF 3/7/20014 1. SR-2000 INITIAL INSPECTION AND TESTING. SO YOU JUST GOT AN SR-2000 FROM E-BAY OR SOMEONE THAT SAID “IT WORKED FINE THE LAST TIME I TURNED IT ON”. NOW WHERE DO YOU START? THE FOLLOWING PROCESS HAS EVOLVED OVER YEARS OF REFURBISHING THE SR SERIES EQUIPMENT. IT SHOULD BE FOLLOWED IN THE ORDER IT IS

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 26 WDØGOF 3/7/20014 7.2 PERFORMANCE DATA 7-2-1. RECEIVER PERFORMANCE DATA OWNER SERIAL # DATE Overall Sensitivity (gain) The receiver will produce a minimum of 500 mw audio out with 1 uv RF signal at the antenna terminal. Tests performed at center of General Class bands BAND TEST FREQ SIG REQ FOR 500mw 80 40 20 15 *10 opt 1 10 std *10 opt 2 *10 opt 3 * Tests performed only if options are installed. Overall Sensitivity (S+N:N) A 1.0uv signal at the antenna terminal will produce a minimum

  • REPAIR AND RESTORATION OF THE SR-2000 18 WDØGOF 3/7/20014 4-7. V6 RX FAULT ISOLATION NOTE: In this next step you will be injecting signal into the plate pin of the tube socket. You will need an injection probe rated for 300 vdc or higher. Pull V6, power up and inject 3000 uv at 1650 KHz into pin 5 of the V6 socket. If you do not get at least ½ watt audio out then L1s5, C5

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 27 WDØGOF 3/7/20014 7-2-2. TRANSMITTER PERFORMANCE Tests performed with 50ohm resistive load. Measurements made with BIRD avg power and PEP power meter. Final amplifier bias set to 200 ma SSB mode zero drive. _________ Neutralization performed @ 21.3 MHZ. _______ Carrier balance null _____ db below full power output level (60 db or more). Microphone input sensitivity at 1000HZ. A signal level not more than 5mv rms shall produce the minimum specified SSB output at specified freq. Mic gain set at max clockwise FREQ MIN SPEC low power PEP LOW MIN SPEC High powe

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 22 WDØGOF 3/7/20014 6. TECH NOTES 6-1 PA NEUTRALIZATION Proper neutralization will enhance the proper operation, efficiency and life of your final tubes. Theory and opinions on the effects of interelectrode capacitance are as numerous as the writers of such articles. So to be very basic, we are attempting to neutralize the effects of the interelectrode capacitance of the PA final tubes. HERE ARE A FEW SITES THAT HAVE DISCUSSIONS ON NEUTRALIZATION. http://www.somis.org/ http://www.vias.org/basicradio/basic_radio_28_04.html http://www.w8ji.com/neutralizing__

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 21 WDØGOF 3/7/20014 5-5 FINAL PA FAULT VOLTAGES IN THE PA SUB-CIRCUITS ARE LETHAL. IF YOU ARE NOT EXPERIENCED IN HIGH VOLTAGE RF TROUBLESHOOTING AND HAVE THE PROPER TEST EQUIPMENT IT IS TIME TO FIND A MENTOR. 5-5 1 UNABLE TO SET PA BIAS. 5-5-1-1 PRELIMINARY RESISTANCE CHECKS Making the following resistance checks will eliminate the need to make high voltage measurements. This will reduce the chances of harm to machine or person. With the power supply completely disconnected. High voltage connector and low voltage connect

  • REPAIR AND RESTORATION OF THE SR-2000 17 WDØGOF 3/7/20014 4. RX SUBSYSTEM TROUBLESHOOTING AND TESTING 4-1 VFO DRIFT You have performed all the tests in section 1-5-4 and determined that you have a drift problem. Perform the drift test in receive, LSB mode. Then perform the same test in receive, USB mode. If you have the drift problem in USB but not LSB the most likely cause is CR12, C12

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 8 WDØGOF 3/7/20014 1-5-4. VFO: The VFO is comprised of: V13 and associated circuitry; V4B and associated circuitry; The VFO correction circuitry; The RIT and CAL circuitry. From the manual: Frequency Stability is; Less than 250 cycles drift in the first hour, after a fifteen minute warm-up, and less than 100 cycles per hour thereafter. Due to the age of the SR-2000 a more reasonable warm up time is 20 to 30 minutes. 1-5-4-1. VFO RIT/CAL The RIT

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 11 WDØGOF 3/7/20014 2-4. RECEIVER FAULT ISOLATION CHART INJECTION POINT FREQUENCY SIGNAL INJECTION LEVEL AUDIO OUTPUT IF GOOD GO TO NEXT TEST. IF NOT CHECK SUGGESTIONS BELOW. 1 V15 pin 7 1000 Hz 16 vpp 1:1 probe ½ wt Problem most likely V15 or associated circuitry. See section 4-2 for details. 2 V9B pin 2 1000 Hz 0.4 vpp 1:1 probe ½ wt Problem is most likely V9B or associated circuitry. See section 4-3 for details. 3 V9A Pin 7 1650 KHz 5000 uv ½ wt Problem is

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 14 WDØGOF 3/7/20014 3-3. INITIAL SETUP TESTS 3-3-1 S-METER ZERO ADJUSTMENT Re check meter zero. If it has drifted return to section 2-6 and reset adjustment. 3-3-2 BIAS ADJUST Go to the manual and complete the procedure in section 8-3. If you are unable to set the proper plate current go to section 5-5-1. 3-3-3 TRANSMITTER PRETEST Go to the manual and complete the procedure in section 8-5. If you are unable to null the carrier to a level of 60db below the maximum output level of either side band you have a fault that must be corrected before proceeding (section 5-1). Perform the procedures in the manual section 5-4 through 5-7

  • Hallicrafters SR-2000, REPAIR AND RESTORATION OF THE SR-2000 16 WDØGOF 3/7/20014 driver V18 or its associated circuitry. Go to section 5-4 DRIVER FAULTS and clear the fault before proceeding. 3-4-4 TX second mixer input test The inputs to the second TX mixer are the Het osc and the 6.5 MHz I.F. They are measured at the grid of V11 the 2 nd XMTR MIXER. 3-4-4-1 Het oscillator TX signal levels To measure the Het osc disable the 6.5 MHz I.F. by pulling V4. Connect the scope to pin 2 of V11. Key the transmitter. Note and compare voltage present to the chart below. BAND PEAK TO PEAK READING 80, 6.0 vpp

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