EQ-1_Schematics_sn_10_96 电路图.pdf

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16、 C . C . . U - + . I N m . NO. , N 0 + m . N . . . . . . Technical Bulletin 3 - Reducinl! the sensitivitI of the Valve EQ auxiliarI ingot. To accomodate higher level signal sources such as active guitars, the sensitivity of the auxiliary input can be reduced by I2dB. Simply change the value of RI50

17、from 330a to 1.5ill. Technical Bulletin 4 - Reducinl! the line inDut sensitivitI of the Valve Comgressor and Valve EQ The sensitivity of the balanced line inputs of the Compressor and EQ can be reduced by I5dB to accomodate very high level signal sources - i.e from multitrack tape machines. On the C

18、ompressor, change RI ,R2, RI6and RI7 from 3.3ka to I8ka. On the EQ , change RI2 , RI3 , R25 and R26 from 3.3ka to I8ka. r J , , , - - - TL AUDIO SERVICE BULLETIN No.s Ul2 to 952143 This modification to the power supply reduces the degree of low level mains hum on the audio outputs of the Valve EQ. S

19、imply replace resistor R7 (lk.Q) with the following resistor / capacitor network: V 150JL uJL ._-lA/Iv :.!v:r 5 0 c tt Units numbered 952143 onwards will have this change already implemented as standard. UK Company registration number 2380220 . I TL AUDIO SERVICE BULLETIN v No.s u to 952143) This mo

20、dification improves the balancing of the ac tube heaters, and results in a reduction in the harshness of the low level background noise on the audio outputs. The modification simply involves changing R104 and R105 (situated next to the mains transfonner) from 100kQ to 1kQ. Units numbered 952143 onwa

21、rds will have this change already implemented as standard. .-! UK Company registration number 2380220 ; . ., . TL AUDIO ERVJCE INFORMA I V lII.D.ul Gain Pots. D-Z EIlialiUL E-O 1 Dual ualiser - Innut Gain-.P.Q1! We are now fitting 5kA/5kC 5% law input gain pots to the n. Audio EQI. When Tetro-fittin

22、g this pot to earlier EQls , the following resistor changes need to be made to ensure that the centre position of the pot travel corresponds to OdB unity gain: a) EQls with 4.7k.J linear single gang gain pot. 1- Change: No., PRAc-llcAt- TO R T. 1/ - lJ b) EQls with 5W5kC gain pot R,i.3J R,25 k k - C

23、h.2.b .= 3ic,. .M . aBle: . 1 R :l., ) A. 3 4-1 , I :- , c) EQls with 5kA/5kRD gain pot .-t , = I co P. . ,v. Change: t t1,Qt - . UK Company registration nwnber 2380220 (Qw.( ,. . - 30/10/95 Pa2e 1 TL AUDIO SERVICE INFORMATION Input Gain Pot ReQlacement - Valve EO. Valve ComQressor. 8/2 Mixer In res

24、ponse to customer requests, a new type of input gain pot (5kA / 5k reverse D law) has been introduce.d on the above units which gives a smoother increase in gain throughout the travel of the pot. Earlier units used a 5kA/5kC pot, and on very early EQs a 4.7k linear single gang pot was used. The resu

25、lt was a sudden and large increase in volume as the gain pot approached the maximum position. The new type pot also has a centre click at the unity gain position. Details of how to retro-fit the new pot to older units follows. The changes in resistor values ensure that the unity gain position still

26、falls in the centre of the pots travel. Dual Valve EO a) Very early units (before the mono cascade mode was introduced) used a single gang 4.7k.Q linear gain pot. To replace this with the new 5kA/5k reverse D type, use the rear set of pins on the new pot, and attach short flying leads between the po

27、t and the relevant holes on the pcb. b) When the mono cascade mode was introduced to the Dual EQ , a 5W5kC pot replaced the 4.7k linear gain pot. The new 5kN5k reverse D pot is a direct plug in replacement for this pot, but to ensure unity gain falls in the centre position, change R UK Company regis

28、tration number 2380220 .ro c .;, , ! EO 1 TEST SPEC I I .! -. .- :. . . . . . : .- C;. - . . I . . . . . , . , ) . EO 1 TEST SPEC TEST SPECIFICATION: TL Audio Issue 2: 5th December 1994. Tolerance on inputs +/-O.3dB, outputs +/-ldB, unless stated otherwise. 1. MAINS VOLTAGE: Set to 240V. 2. GROUND C

29、ONTINUITY: Limit 0.01 ohms. 2.1 Measure the resistance between the ground pin of the IEC inlet to the chassis ground screw. u 3. VISUAL INSPECnON: Inspect the unit, paying particular attention to the following items: 3.1 - the orientation of power supply diodes and capacitors, 3.2 - the orientation

30、of Ics, 3.3 - all mains wiring, 3.4 - check the solder side of the PCB for unsolderedjoints and solder splashes, 3 . 5 - the quality of external paint and silk screening, 3.6 - check all knobs and switches operate freely and are uniformly spaced from the panel, 3.7 - all XLR connectors are locked, 3

31、.8 - LED alignment with front panel. Tests 4 and 5 should be performed on each channel: 4. PHANTOM POWER: +48V. Equaliser: 48V On, measure on pins 2 and 3 ofMic input socket. ) - - , 5. INPUTS: 5.1 MIC INPUT: Output OdBu. Equaliser: Mic Input, Gain Max, EQ out, EQ flat, OIP level switch +4dBu, Dual

32、Channel. A2: 1KHz, Sine, -60dBu, 22-22k Filter, Meter. 5.2 EQUALISER IN: Output OdBu. 5.3 MIC INPUT NOISE: Limit -67dBu (EIN = -127dBu). Equaliser: Disconnect input and replace with l50R termination. 5.4 AUX INPUT: Output -15dBu. Equaliser: Input to Aux. 5.5 LINE INPUT: Output OdBu. Equaliser: Input

33、 to Line, Line Input, Gain OdE. 5.6 OUTPUT LEVEL SWITCH: Output -14dBu. Equaliser: OIP Level switch -lOdBu. 5.7 UNBALANCED INPUT: Output -6dBu. Equaliser: Input to Unbal, OIP Level switch +4dBu. 6. 8 BAND MONO MODE: Output OdBu. Equaliser: 8 Band Mono, Ch B Gain Max, Ch B output, Ch A Line input. 7.

34、 HUM AND NOISE: -77dBu. A2: Output Mute. 8. DISTORllON: Limit 0.05% A2: 22-22K Filter out, THO, Output On. . - v 9. EQ CONTROLS: A2: ALT, Scope. 9.1 FLAT RESPONSE: Check square wave response at the 4 frequencies for all 8 bands. 9.2 CUT/BOOST: Check the square wave response varies at the 4 frequencies for all 8 bands. 10. SOAK TEST. 11. AUDIO/QA TEST. )