5001_Test_Spec 电路图.pdf

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1、- -:; TEST SPECIFICATION: TL Audio IVORY 5001 MIC PRE-AMP Ref. Number: TS5001 Issue 1. Page lof3 Toleratlce on illputs +/- 0.3 dBu, outputs +/- I dBu, un1 otllerwise stated Tests must be petfOffiled ill sequence, witll controls chatlged as illdicated I. mSTORY SHEET. Each unit must be accompanied by

2、 an INSTRUMENT mSTORY SHEET. Ensure the History Sheet has been completed satisfactorily. 2. MAINS VOLTAGE. Check the Mains Switch setting on the rear panel. It must be 230V. 3. EARTH CONTINUITY. Check the earth connection from the IEC connector to the rear panel. Check the tightness of the Rear Pane

3、l Earth connection. It must be tight. Check that an Earth Symbol has been placed adjacent to the Earth Terminal. 4. VISUAL INSPECTION. Inspect the unit, paying particular attention to the following: 4.1 PSU Capacitors and Diodes. Value and orientation. 4.2 Intergrated circuits. Type and orientation.

4、 4.3 Transformer Wiring. . Wired as per PCB silk screen. Check insulation of wires. 4.4 Soldered Joints. Check for solder shorts, dry or unsolderedjoints. 4.5 Internal Fuses. Check fuses are seated correctly. Check values as stated on the PCB Silk Screen. 4.6 External Finish. Check front and rear pa

5、nel silk screening for legilbility. Check all external surfaces for marks and blemishes. Check that all screw heads are undamaged, check screws are tight. 4.7 Knobs and Switches. Check that Knobs and Switches move freely. Check they are correctly aligned with their legends. Check they are uniformly

6、spaced from the front panel. 4.8 LED Alignment. Check that all LEDs are equally spaced from the front panel. 5. FIT VAL YES Check the valve bases for splayed pins. Perform corrective action as necessary. All valves are ECC83/12AX7 A unless otherwise stated. Plug valve in each socket, ensure valve is

7、 a tight fit. Do not wiggle valve in socket 6. SWITCH ON. Check Mains Switch moves freely. Leave in OFF position. Set DVM to DC Voltage and connect between Ground & + 15 volt point on PCB. Connect the IEC Mains Cord to the Mains Inlet Switch unit On. Check each supply in turn as quickly as possible.

8、 Switch OFF if a supply is not present 6.1 +15 volt rail. +15.00 volts +/- 0.25v. 6.2 -15 volt rail. -15.00 volts +/- 0.25v. 6.3 HT voltage 150 volts +/- 8.0. 6.4 Heater voltages +6.3 volts & -6.3 volts +/- 1.Ov. 6.5 Phantom Power. +48 volts +1.Ov/-4.0v. 7. LED CHECK. Using the appropriate controls

9、check all LEDs illuminate together. The DRIVE and PEAK LEDs may be excluded from this test. Revision Historv From Serial Nunlbcr: 56000 1 To Serial Number: RadioFans.CN 收音机爱 好者资料库 - - TEST SPECIFICATION: TL Audio IVORY 5001 MIC PRE-AMP Ref. Number: TS5001 Issue 1. Page 2 of3 Tolerance on inputs +/-

10、0.3 dBu, outputs +/- I dBu, unless otherwise stated. Tests must be perfonned in sequence, Wit11 controls chatlged as indicated. 8. INITIAL SETTINGS. Set all Front panel Svitches to the OUT position. Set all Pots to mid-position Set all Rotary Switches fully anti-clockwise. 9. TEST EQUIPMENT. To perf

11、orm the tests to this procedure use: A calibrat Signal Generator.(Sinewave) 0.0 dBu 1 kHz unless stated. A calibrated Signal Analyser.(dBufrHD+N%fPhase) With 22-22k Filter to On. An Oscilloscope. A Digital Voltmeter. A metal film 150R resistor in shielded XLR connector. (pins 2 & 3) 9.1 REFERENCES A

12、ll unit settings are on the Front Panel unless Stated otherwise. . All Settings(RVnn) are on the Main PCB unless Stated otherwise. 9.2 mSTORY SHEET. All faults/rework must be logged on the History Sheet. Where pratical show the operator/assembler the nature of the problem. Serious/Repetitive faults

13、must be reported to the Production Manager. After the unit has been succesfully tested Sign & Date the History Sheet. The History Sheet must remain with the unit at all times. After the unit is dispatched the History Sheet must be flIed for analysis. . I Revision Histo From Serial Number: 56000 I To

14、 Serial Number: RadioFans.CN 收音机爱 好者资料库 - TEST SPECIFICATION: TL Audio IVORY 5001 MIC PRE-AMP Ref. Number: TS5001 Issue 1. Page 3 of3 Tolerance on inputs +/- 0.3 dBu, outputs +/- 1 dBu, unless otherwise stated. Tests must be perfonned in sequence, with controls changed as indicated. 10. INITIAL TEST

15、S. Conduct the Tests on Channell and then repeat all the Tests on Channel 2,3 & 4. Where applicable Channel 2,3 & 4 test references are shown in brackets. 10.1 PHANTOM POWER. Connect DVM to XLR pin 2 and Ground. Select +48V switch to ON. Check for +48 volt reading.(+ Iv/-4v) Repeat test for XLR pin

16、3 and Ground. After test is complete set +48 V switch to OFF. 10.2 SIGNAL BALANCE. Connect input to Input XLR. -40 dBu. . Alternately scope pins 2 & 3 of OUTPUT XLR while adjusting RV5(6,7,8). Adjustment is complete when the signals at pins 2 & 3 are equal. 11.0 CALmRATION. 11.1 INPUT GAIN. Signal I

17、n = -60 dBu to InputXLR. Signal Out from Output XLR. Set Analyser Filter to ON. Set INPUT GAIN pot fully clockwise. Set OUTPUT GAIN pot to centre position. The reading should be 0.0 dBu +1- 0.5 dBu. If not select the value ofRI69(R170,RI71,Rl72) to suit. Note: These resistors are on the Left. and Ri

18、ght hand front panel PCBs. 11.2 MIC NOISE Connect 150R resistor across MIC XLR pins 2 & 3. Check for a change in value of -67 dBu or better. 11.3 UNBAL OUT. Signal In = -60 dBu to Input XLR. Signal Out from Rear Panel Unbal Output.(Double Pole) Checkfor-14.0dBu+l-l.0dBu. 11.4 90Hz Filter. Signal In

19、= -60 dBu 90Hz to Input XLR. Signal Out from Output XLR. Note value with 90Hz switch OUT. Press 90Hz switch IN. Value should drop by -3 dBu. Leave 90Hz switch OUT. 11.5 DISTORTION Set Signal In to -20 dBu 1kHz. Set INPUT GAIN pot fully anti-clockwise. Set Analyser to read THD+N(%). Set RVI3(14,15,16

20、) for a value below 0.08%. Note: Allow 3-4 seconds behveen each adjustment for reading to settle. Return Analyser to read dBu. 11.6 DRIVE 1 PEAK LEDs. With INPUT GAIN pot fully anti-clockwise and OUTPUT GAIN pot clockwise. Set Signal In to -12.0 dBu. Check that DRIVE LED is Off. Set Signal In to -8.

21、0 dBu. Check that DRIVE LED is just ON. Set Signal In to +2.0 dBu. Check that DRIVE LED is fully ON. Check that PEAK LED is ON. Set OUTPUT GAIN to mid-position. Note: PEAK LED may have illuminated at the previous step. Set Signal In to +5.0 dBu. Check that PEAK LED is OFF. Set Signal In to +7.0 dBu. Check that PEAK LED is ON. Set Signal In to -39.0 dBu. Set INPUT GAIN pot fully clockvise. Check that PEAK LED is OFF. Set Signal In to -36.0 dBu. Check that PEAK LED is ON. Revision Histo From Serial Number: 560001 To Serial Number: RadioFans.CN 收音机爱 好者资料库