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Hallicrafters SR-2000 Repair Manual

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Download this manual See also: Operating/service Instructions
REPAIR AND RESTORATION OF THE SR-2000
REPAIR & RESTORATION
OF
HALLICRAFTERS
SR-2000
&$87,21 )$7$/ 92/7$*(6 $5( 23(1 $1' (;326(' 21&(
7+( &29(56 25 &$6( ,6 5(029(' 2%6(59( 7+( )5((
+$1' 58/( 7+$7 ,6 $1< 7,0( 7+( 32:(5 ,6 $33/,(' ,)
<28 $5( 5,*+7 +$1'(' <285 /()7 +$1' ,6 ,1 <285 +,3
32&.(7 ,) <28 $5( /()7 +$1'(' <285 5,*+7 +$1' ,6
,1 <285 +,3 32&.(7 <28 352&((' $7 <285 2:1 5,6.
This document is the intellectual property of the author, Walter A. Cates, WDØGOF. Unless specifically
credited to a contributor, all processes, ideas, drawings, data sheets and opinions contained here-in are the
intellectual property of the author. Any reproduction of this document for profit will be vigorously pursued.
1
WDØGOF 3/7/20014

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Summary of Contents for Hallicrafters SR-2000

  • Page 1 REPAIR AND RESTORATION OF THE SR-2000 REPAIR & RESTORATION HALLICRAFTERS SR-2000 &$87,21 )$7$/ 92/7$*(6 $5( 23(1 $1' (;326(' 21&( 7+( &29(56 25 &$6( ,6 5(029(' 2%6(59( 7+( )5(( +$1' 58/( 7+$7 ,6 $1< 7,0( 7+( 32:(5 ,6 $33/,(' ,) <28 $5( 5,*+7 +$1'(' <285 /()7 +$1' ,6 ,1 <285 +,3 32&.(7 ,) <28 $5( /()7 +$1'(' <285 5,*+7 +$1' ,6...

  • Page 2: Introduction

    REPAIR AND RESTORATION OF THE SR-2000 INTRODUCTION This is not a “restore to museum” quality guide. Cleaning, painting and front panel touchup are not covered. There are reams of documents that cover those actions. There are very few documents that delve into the inner workings of these radios.

  • Page 3: Table Of Contents

    REPAIR AND RESTORATION OF THE SR-2000 TABLE OF CONTENTS INTRODUCTION ..............................2 1. SR-2000 INITIAL INSPECTION AND TESTING................... 5 1-1. VISUAL AND MECHANICAL INSPECTION ..................5 1-2. RECAPPING; .............................. 5 1-3. AFTER MARKET MODIFICATIONS ...................... 5 1-4. INITIAL POWER UP ..........................6 1-4-1.
  • Page 4 REPAIR AND RESTORATION OF THE SR-2000 4-3. V9B RX FAULT ISOLATION ......................... 17 4-4. V9A RX FAULT ISOLATION ......................... 17 4-5. V7A RX FAULT ISOLATION ......................... 17 4-6. XTAL RX FILTER/NOTCH FAULT ISOLATION ................17 4-7. V6 RX FAULT ISOLATION........................18 4-8.

  • Page 5: Sr-2000 Initial Inspection And Testing

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 6: Initial Power Up

    High Voltage until you get to the Transmitter PA tests. It is not necessary to start with a low AC voltage and increase the voltage over time to cook the rig. There are no domino circuits in the SR-2000. If you have a short somewhere, you may cook a resistor and it will smell bad but it will lead you straight to the problem.

  • Page 7: Test Equipment Required

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 8: Vfo

    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/CAL ckts are used to change the bias voltage on a varicap in the VFO.

  • Page 9: Vfo Stability Test

    Rerun and record the data. If any of the mid points fall more than 2 KHz from spec knifing of C120 is indicated (I use 1 KHz for my shop spec). Knifing should never be attempted on the SR-2000 unless you are very skilled at knifing.

  • Page 10: Receiver Fault Isolation

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 11: Receiver Fault Isolation Chart

    REPAIR AND RESTORATION OF THE SR-2000 2-4. RECEIVER FAULT ISOLATION CHART INJECTION POINT FREQUENCY SIGNAL AUDIO IF GOOD GO TO NEXT TEST. IF NOT CHECK SUGGESTIONS BELOW. INJECTION OUTPUT LEVEL V15 pin 7 1000 Hz 16 vpp ½ wt Problem most likely V15 or associated circuitry.

  • Page 12: Agc Test

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 13: Transmitter Testing

    REPAIR AND RESTORATION OF THE SR-2000 3. TRANSMITTER TESTING The goal of this section is not to get maximum power out of the radio. The goal is simply to prove that the without major transmitter sections are functioning. The preliminary testing will be done HIGH VOLTAGE or SCREEN voltage applied.

  • Page 14: Initial Setup Tests

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 15: Driver Output Test

    Go to section 5-5 for PA fault isolation. NOTE: 18vpp on any band will drive Blue Burle tubes to saturation and the Green Burle tubes will require 21vpp to fully saturate. The Black Burle tubes cannot be used in the SR-2000. For in-depth k9amx.com...

  • Page 16: Tx Second Mixer Input Test

    REPAIR AND RESTORATION OF THE SR-2000 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 XMTR MIXER.

  • Page 17: Rx Subsystem Troubleshooting And Testing

    REPAIR AND RESTORATION OF THE SR-2000 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, C126 or C127.

  • Page 18: V6 Rx Fault Isolation

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 19: Tx Subsystem Troubleshooting And Testing

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 20: Tx 6.5 Mhz Low Injection To

    REPAIR AND RESTORATION OF THE SR-2000 Reinstall V12 and connect the scope to the junction of L20 and CR11, key the transmitter. You should see a signal of 4 vpp or more. 1, If not then C107 or L20 is bad (this is predicated on the fact that all signals in the tests in section 1-5-3 were good).

  • Page 21: Final Pa Fault

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 22: Tech Notes

    There is nothing new or revolutionary about this process. It is a proven process that has be in use for over 60 years. All I have done is specifically adapt it to the SR-2000. Before starting the process you need to tune the TX as best as you can at 21.3 MHZ.

  • Page 23: Audio Power Meter Substitute

    REPAIR AND RESTORATION OF THE SR-2000 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 while testing the rig.

  • Page 24: Additional Technical Information Sources

    : This is a member only site. It is free to join and I strongly recommend joining if you are a Hallicrafters fan. In the files section of this site is the largest collection of Hallicrafters technical information I have found anywhere. With close to 1000 members any post to the group will result in expert answers to any questions but you will have to be a member to post.

  • Page 25: Data Sheets

    REPAIR AND RESTORATION OF THE SR-2000 7. DATA SHEETS 7-1. VFO FREQUENCY CORRECTION BLACK SPEC TEST 1 TEST 2 TEST 3 TEST 4 TEST 5 TEST 6 DIAL 4.851450 4.751450 4.651450 4.551450 4.451450 4.351450 WDØGOF 3/7/20014...

  • Page 26: Performance Data

    REPAIR AND RESTORATION OF THE SR-2000 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.

  • Page 27: Transmitter Performance

    REPAIR AND RESTORATION OF THE SR-2000 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).

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