LabGruppen Check_list_after_service_class_TD电路图.pdf

Modified: 2008-04-16 Page 1 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN Checklist after service of class TD LAB 2000, LAB 2000C, LAB 2002, LAB 4000, fP 3400 & fP 6400 Created by: Patrick Bergwall Date: 2006-12-15 RadioFans.CN 收音机爱 好者资料库 Modified: 2008-04-16 Page 2 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN Index 1 INTRODUCTION.3 2 CHECK LIST CLASS TD.3 RadioFans.CN 收音机爱 好者资料库 Modified: 2008-04-16 Page 3 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 1 Introduction This checklist shall be used to make sure the amplifier is always checked in a proper way after service has been done. It is important to follow the steps in this check list and check all points so that the set up of parameters in the amplifier is correct adjusted. When have done all checks and adjusted the parameters the amplifier will work properly and will have the output power that it is designed for. 2 Check list class TD Always clean the amplifier by blowing with compressed air through coolers and fans. Be careful when blowing where big electrolytic capacitors are placed so that the capacitor doesnt get damaged. If HF- or LF-units have been repaired, always turn the potentiometers fully counter clockwise on HF-unit before starting the amplifier up (step 1). RadioFans.CN 收音机爱 好者资料库 Modified: 2008-04-16 Page 4 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 1) After repair always start the amplifier with current potentiometer (VR3) in mains power circuit. On is clockwise (cw) and off is counter clockwise (ccw). Check that the switch pulse is normal. 300V line should increase some volts when relay clicks. Measure step 2 under start up. Measuring points. VR3 Modified: 2008-04-16 Page 5 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 2) Measure that 16V is correct balanced (tolerance 0.2V). The voltage shall be balanced from 4.5V up to 16V. If not stop immediately and turn the VR3 ccw again. Start troubleshooting the amplifier. Negative side. Positive side. Modified: 2008-04-16 Page 6 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 3) Start up of HF-unit. Check HF-wave at 1.3kHz and 13kHz at 8. Measuring points. Adjustment points. (On=cw and off=ccw). Potentiometers full ccw. Potentiometers full cw. Clip 1.3kHz. Clip 13kHz. Modified: 2008-04-16 Page 7 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 4) Check output signal at clip 8. Wave measured at 1.3kHz. Wave measured at 13kHz. 5) Check offset on all channels, <30mV. Check offset without load, <100mV, on all channels in protect. (Shorten temp resistor on each module, temp warning diode shall light up). Shorten of temp resistor. Measuring points. Modified: 2008-04-16 Page 8 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 6) Check rail voltage. SP80FB 2x17-2 shall be 136.2V, with a maximum -0 and +2V difference between positive and negative rail. (Increase voltage = cw, decrease voltage = ccw). SP80FB 2x32-2 shall be 155V, with a maximum -0 and +2V difference between positive and negative rail. (Increase voltage = cw, decrease voltage = ccw). Potentiometer for adjusting rail voltage. Measuring points positive side. Measuring points negative side. Modified: 2008-04-16 Page 9 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 7) Check VHF protect on all channels. Turn on gain potentiometer at front to reach clip at 13kHz. Amplifier shall be in VHF protect between 4 7 seconds. 8) Check fan control. At idling mode measure approximately 23V and at full speed approximately 60V. Short circuit of temp resistor (controlling fan speed) to get full speed of fans. Measuring points for fan. Modified: 2008-04-16 Page 10 of 10 THIS DOCUMENT IS CONFIDENTIAL. IT MAY NOT BE REPRODUCED WITHOUT THE WRITTEN PERMISSION OF Lab.gruppen AB 2006 Lab.gruppen AB, Faktorvgen 1, S-434 44 KUNGSBACKA, SWEDEN 9) Check output signal at short circuit on the outputs. 10) Check mains switch for bad contact (click noise). 11) Check gain potentiometers at front. No disturbance at output signal shall be detected when turning the potentiometer from one end point to the other end point. 12) Check dust filter, change when needed.