2051_Test_Spec 电路图.pdf

. . . . TEST SPECIFICA nON: TL Audio 2051 INDIGO VOICE PROCESSOR. Issue I: 30th AU2ust 1996. Tolerance OD inputs +/-O.3dB. outputs +/-ldB. unless stated otherwise. Tests must be rformcd in sequence. with controls changed only as indicated. I. MAINS VOLTAGE: Set to 230V. 2. GROUND CONTINURV: Limit 0.01 ohms. 2.1 Measure the resistance between the ground pin of the IEC inlet to the chassis ground screw. 3. VISUAL INSPECTION: Inspect the unit, paying particular attention to the following: 3.1 - the orientation of power supply diooes and capacitors, 3.2 - dte orientation of ICs, 3.3 - all mains wiring, 3.4 - check the solder side of the PCB for uosoldered joints and solder splashes, 3.5 - the quality of cxternaI paint and silk screening, 3.6 - check all knciS and switches operate freeJy and are uniformly spaced from the panel, 3.7 - all XLR oonnectors are kCkcd, 3.8 - LED alignment with front panel. 3.9 - check all screws are fully tightened. 4. SWDCH ON, and check for any sign of oomponent stress or over-heating. 4.1 OFFSET SETUP: -SOmV +/-5mV. Compressor: Threshold, Ratio and Gain Make-Up anti-<:lockwise, Fast Attack and Release. Adjust Offset trim RV4 on PCI50 whilSt measuring at test point 1. RadioFans.CN 收音机爱 好者资料库 . 5. INPUTS: S.1 LINE INPUT: Output OdBu. Compressor: XLR Input, Gain 0dB, XLRO/P. Compressor Out, Threshold +20, Gain Make Up (GMU) 0dB. A2: 1KHz, Sine, OdBu, 22-22k Filter, Meter. Adjust RV2 on PC IS 1 for OdBu output. AdjustRVl onPClSl for balance. 5.2 INPUT GAIN: A2: -20dBu. Compressor: Check input gain variation +/-20dB. Return A2 level to OdBu. S.3 COMPRESSOR IN: Output OdBu. Adjust RVI on PCISO. 5.4 EQ IN: Output OdBu. Adjust RV2 on PCXIsO. 5.5 EQ PRE-QN. <2S8f. of original waveform size. Equaliser: Set LM &. HM Gain to minimum. Scope R91 on PCl. Note amplitude. EQ PRE.QFF . Equaliser: Set LM &:. HM Gain to midoposition. -1 5.6 HUM AND NOISE: U.it -80dBu. A2: Mute Output 5.7 AUXINPUT,LOGAIN: Output-16dBu. A2: OdBu. - RadioFans.CN 收音机爱 好者资料库 . . . . Compressor: Input lo Aux Jack, Gain 0dB, Lo Gain. 5.8 AUX INPUT, HI GAIN: Output +6dBu. A2: -20dBu. Compressor: Hi Gain. 5.9 UNBALANCED INPUT AND OUTPUT: Output -20dBu. Compressor: Input to unbalanced jack, 0UtIMJt from unbalanced jack. 6. DISTORTION: Limit 0.20/. A2: 22-22K Filter out, rnD. Compressor: Input and output via XLR. Comp out. 7. THRESHOLD ADJUSTMENT. A2: Level, output -20dBu. Compressor: With Threshold and Ratio fully anti-clockwise, check output -2<XIBu. Set Threshold and Ratio fuIIy clockwise, increase A2 output to +4dBu, and adjust Threshold trim for .7.OdBu output using RV3 on PC150. 8. METERS: 8.1 AUDIO LEVEL: +4dBua OW. Compresor: Threshold + lOdB, check output +4dBu. Adjust Meter REF (RV14) to just illnminate 0dB LED. - 8.2 GAIN REDUCTION: B. Compr: Threshold 20dB, adjust Ratio for -2dBu output. Meter Gain ROOD. Adjust RV15 to just illuminate -6dB LED. 8.3 GAIN MAKE-UP: +24dBu. Compressor: Threshold +20dB, GMU maximum. Return GMU to minimum after test RadioFans.CN 收音机爱 好者资料库 . . . . , . . 9.0 . EQ RESPONE: A2: AL T waveform. For each band, check flat at each switched frequency, and boost/cut response. Return all boost/cut controls to centre. 10.0 PHANTOM POWER. 10.1 Using the test fixture, check the operntion of the +48V switch, and measure the voltage at the mic input socket. 11.0 HUM AND NOISE. U8lit -67dBu. 11.1 Voice Proc: Select mic input Input gain to maximum. Remove A2 and replace with ISOR terminator. 12. SOAK TEST. With top and bottom covers fitted. 13. DYNAMIC TEST. Check operntion of the compreesor controls with the tone-burst generator, in mono and stereo mode. 14. QA CHECK.