Goodmans-GMS950R-cs-sm 电路图 维修手册.pdf

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1、Service Manual - GMS950R GMS950R Service Manual - GMS950R RadioFans.CN 收音机爱 好者资料库 CAUTION: Before servicing the chassis, read the important service safety information section on page 2 of this manual. SPECIFICATIONSCONTENTS DISASSEMBLY INSTRUCTIONS- 3 ADJUSTMENT LOCATIONS-4 ALIGNMENT PROCEDURES-5 -

2、10 IC BLOCK DIAGRAMS-14 - 19 VOLTAGE CHARTS-11 - 13 BLOCK DIAGRAM-20 WIRING DIAGRAM-21 PRINTED CIRCUIT BOARDS-29 -32 SCHEMATIC DIAGRAMS-22 - 28 EXPLODED VIEW/PARTS LIST (CABINET)-33 - 35 IMPORTANT SERVICE SAFETY INFORMATION-2 NOTE: All the specifications and features are subject to change without no

3、tice. 7th Floor, Chung Mei Centre, 15A Hing Yip Street, Kwun Tong, Kowloon, Hong Kong. Tel:(852)2790 3392 (12 Line),Fax: (852)2341 8874 Email Address: .hk MODEL:NE-566 SERVICE PUBLICATION AM/FMTUNER SECTION ANTENNA SYSTEM FM: LEAD WIRE TUNING RANGE FM: 87.5 - 108 MHz AUDIO SECTION SPEAKER IMPEDANCE

4、: 4 OHM GENERAL: 5 x 2 POWER INPUT: AC 230V-50Hz AC POWER CONSUMPTION MAIN DIM: 152(L)(H)mmx237.5(W)x218.5 WEIGHT: 5.6Kg AM: 522 - 1620 kHz AM: FERRITE BAR SPEAKER DIM: 140mm(L)x185(W)x218.5(H) PORTABLE RADIO CASSETTE WITH CD PLAYER RadioFans.CN 收音机爱 好者资料库 2 IMPORTANT SERVICE SAFETY INFORMATION ANTE

5、NNA TERMINAL OHMMETER OM EXPOSED METAL PART TEST ALL EXPOSED METAL SURFACES (READING SHOULD NOT BE ABOVE 0.5mA) LEAKAGE CURRENT TESTER EARTH GROUND DEVICE UNDER TEST 2-WIRE CORD ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED) AC LEAKAGE TEST 2. PRODUCT SAFETY NOTICE some electrical

6、and mechanical parts have special safety related characteristics which are often not evident from visual inspection. Nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage , wattage, etc. Parts that have special safety characteristics are

7、identified by aon schematic and parts list. Use of a substitute replacement that dose not have the same safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. Product safety is under review continuously and new instructions are issued whenever Appr

8、opriate. 3. Servicing precautions CAUTION: before servicing the unit covered by this service by this service manual and its supplements. Read and follow the SAFETY PRECAUTIONS on this page. NOTE: if unforeseen circumstances create a conflict between the following servicing precautions and any of the

9、 Safety precautions, always follow the safety precautions. Remember: safety first. General servicing precautions. a. Always unplug the unit s AC power cord from the AC power source Before: (1)removing or reinstalling any component, circuit board, module or any other unit assembly. (2)disconnecting o

10、r reconnecting any unit electrical plug or other Electrical connection. (3)connecting a test substitute in parallel with an electrical capacitor caution: a wrong part substitution or incorrect polarity installation Of electrolytic capacitors may result in an explosion hazard b. Do not defeat any plu

11、g/socket b+ voltage interlocks with which the unit covered by this service manual might be equipped. c. Do not apply AC power to this unit and/or any its electrical assemblies unless all solid-state device heat sinks are correctly installed. d. Always connect a test unit instrument s ground lead to

12、the unit s chassis ground before connecting the test instrument s positive lead always remove the test instrument s ground lead last. CAUTION: USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES HEREIN MAY RESULT IN HAZARDOUS RADIATIONEXPOSURE. DANGER:IF INTERLOCK FAILS OR IS DEFEATED, THE LAS

13、ER LIGHT IS ABLE TO FUNCTION. THE LASER IS INVISIBLE, AVOID DIRECT EXPOSURE TO BEAM. 4. Laser precautions Warning! (1)When servicing.(Incase it isnecessary to confirmlaser Beam emission ) besure not toplace your eyesany closer than1or 30cm from thesurface ofthe objective lens on the opticalpickup bl

14、ock. HANDLING THE LASERPICKUP ( 2)Laser Diodesare Extremely Susceptibleto damage from staticelectricity even ifa static dischargedies not ruin the diode, itcanshorten its lifeor cause itto work improperly.When replacing the pickup, usea conductive maton the floorand desk andwear a wrist band connect

15、ed to groundthrough a 1Mohm resistor toprotect the laserdiode from staticdamage. If thelens should getdusty, blow off thedust carefully fromthe object. (3)There areno adjustable partsin the pickupassembly. If it is defective,replace the wholepickup assembly. 1. SAFETY PRECAUTIONS Before returning a

16、unit to the customer, always make a safety check of the entire unit, including, but not limited to the following items: a. Be sure that no built-in protective devices are defective and/or have been defeated during servicing. (1)protective shields are provided to protect both the technician and the c

17、ustomer. Correctly replace all missing protective shields including any removed for servicing convenience. (2)when reinstalling the chassis and/or other assemblies in the cabinet, be sure to put back in place all protective devices, including , but not limited to , nonmetallic control knobs, insulat

18、ing fishpapers. adjustment and compartment covers/shields and isolating resistor/ capacitor networks. Do not operate this or permit it to be operated Without all protective devices correctly installed and functioning . b. Be sure that there are no cabinet openings through which an adult or child mig

19、ht be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, excessively wide cabinet ventilation slots, and an improperly fitted and/or incorrectly secured cabinet back cover. c. Leakage current hot check - with the unit completely reassembled ,

20、plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National standards Institute (ANSI) C101.1 Leakage Current for Appliancesand Underwriters Laboratories(UL) 1410

21、(50.7). WITH THE UNIT AC switch first in the ON position And then in the OFF position, measure from a known earth ground (metal water pipe, conduit, etc.) To all exposed metal parts of the Unit (antennas, handle bracket, metal cabinet, screw heads , metallic overlays, control shaft, etc.) Especially

22、 any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp, reverse the unit power cord plug in the outlet and repeat test . ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HERENING INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE E

23、LIMINATED RETURNING THE UNIT TO THE CUSTOMER. d. Insulation resistance test cold check: unplug the power supply cord and connect a jumper wire between the two prongs of the plug . Turn on the power switch of the unit. Measure the resistance with an ohmmeter between jumpered AC PLUG AND EACH Exposed

24、metallic cabinet part on the unit, such as screw heads, antenna, control shafts, handle brackets, etc. When the exposed metallic part has a return path to the chassis , the reading should be between 1 and 5.2 megohms. When there is no return path to the chassis, the reading must beinfiniteIf it is n

25、ot within the limits specified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. RadioFans.CN 收音机爱 好者资料库 DISASSEMBLY INSTRUCTIONS 3 3 X 10 KA3 X 10 KA 3 X 10 PA3 X 10 PA ADJUSTMENT LOCATIONS 4 ALIGNMENT PROCEDURES 5 FM AND

26、 AM RF ALIGNMENT CHART ( IF ) StepitemInput CircuitOutput CircuitTunerAdj -Adjustment SetupSetupsettingPoint Unless otherwise specified set switches as follows: FM Function: FM Adjust generator frequency to a center of the FM band where no FM broadcast exists IFConnect FM IFConnect Co19 and GNDFM in

27、 band Adjust for straight and 1Adjustmentsweep output IF-OUT terminal toendT101symmetrical S-curve terminal to IC102 IF sweep input terminalwith max.amplitude. 2FMHeadphone jack or 87.5 MHzL103Adjust L103 for max output Band setupspeaker terminal108MHzDone FM SG ANT.Headphone jack or 90.1 MHZL102Adj

28、ust for max.output and 3Tracking (1)Terminal 90.1 MHz,speaker terminalMONObest waveform 1kHz, +-22.5kHz dev 4Tracking (2)106.1 MHz, 1 kHzHeadphone jack or 106.1 MHzCT101Same as above. +-22.5 MHz devspeaker terminal 5Repeat steps 3 and 4. MW IFConnect standard loopConnect input terminal MW in band Ad

29、just tor max. amplitude 1Adjustmentantenna to output ter-genescope to detector endT131with symmetrical 450 kHz. minal of genescopeoutput 2MWHeadphone jack or 522 kHzL135Adjust L135 for max output Bandspeaker terminal1620 kHzDone 3Tracking (1)612 kHz 400 kHz,Headphone jack or 612 kHzL106Adjust for ma

30、x.output and 30% modspeaker terminalbest waveform 4Tracking (2)1404 kHz 400 kHz,Headphone jack or 1404 kHzCT131 Same as above. 30% modspeaker terminal 5Repeat steps 3 and 4. TAPE SECTION HEAD ADJUSTMENT (AZIMUTH) 10 kHz test tape (example:MTT-114N) must be used for this adjustment. Connect to VTVM o

31、r oscilloscope to the head- phone JCK or speaker terminal Press the play button. Adjust the azimuth by using a screw driver to maintain the maximum L & R output voltage. Adjust tape. Please secure the azimuth position by using locking paint. RECODING BIAS OSCILLATOR FREQUENCY ADJUSTMENT Connect the

32、frequency counter to of R601 two ends. Press REC button of tape . Adjust T201 obtain 60 kHz +-100 HZ ALIGNMENT PROCEDURES 6 FM RECEIVER PERFORMANCE DATA Band:FM Supply Voltage:AC 230 V Standard Output:500mw Dummy Load:4ohm Modulation: 1 KHz 22.5 KHZ DEV EQ or Tone at Flat Place Bass OFF Place Measur

33、ing ItemsUniteNormLimitSample1Sample2 RDS90.1 MHzdb3036 Sensitivity98.1 MHzdb3036 106.1 MHzdb3036 30db Quieting90.1 MHzdb1826 Sensitivity98.1 MHzdb1826 106.1 MHzdb1826 Auto Locked90.1 MHzdb2632 Sensitivity98.1 MHzdb2632 106.1 MHzdb2632 ACA+300 KHzdb2015 ( 2-Signal )-300 KHzdb2015 Image RejectionAT 1

34、06.1 MHzdb2216 IF RejectionAT 90.1 MHzdb5040 -3db Limiting Sens .1mv I/Pdb1822 AM Suppression1mv I/Pdb3530 S/N1mv I/Pdb4035 Stereo Sensdb2026 Stereo Lamp On Sens.db2026 Separation R/Ldb2520 Audio Freq.LowHz80100 Response-3dbHighKHz54 Modulation Hum1 mv I/Pdb4035 Hum & Noise(min.vol.)mv13 Output (10%

35、 Dist) (MOD=40KHz)mW45004000 Total Harmonic Distortion 1 mv I/P%13 OSC Drop Out 1 mv I/PV CurrentNo signalmA ConsumptionMaxmA Frequency RangeLowMHz87.5+/-0.3 HighMHz108+/-0.3 IF Frequency MHz10.7+/-0.2 ALIGNMENT PROCEDURES 7 MW RECEIVER PERFORMANCE DATA Band:MW Supply Voltage: AC 230 V Standard Outp

36、ut:500mw Dummy Load:4Ohm Modulation: 1 KHz 30% EQ or Tone at Flat Place Bass OFF Place Measuring ItemsUniteNormLimitSample1Sample2 20db Quieting 612 KHzdB/M6066 Sensitivity999 KHzdB/M6066 1404 KHzdB/M6066 Auto Locked 612 KHzdB/M6670 Sensitivity999 KHzdB/M6670 1404 KHzdB/M6670 S/N 5mv/MdB3530 ACA+9 K

37、HzdB1812 -9 KHzdB1812 Band Width-6dB+SideKHz310 -SideKHz310 Image RejectionAT 1404 KHzdB3530 IF RejectionAT 612 KHzdB5040 Tweet 50mv/M2IF%510 AGC FOM-10db 100mv/MdB4535 Audio Freq.LowHz802.2 Modulation Hum100 mv/MdB3832 Hum (Volume At Min)mv13 Output (10% Dist) (MOD=80%)mW45004000 Total Harmonic Dis

38、tortion 5mv/M%24 OSC Drop Out 5mv/MV CurrentNo signalmA ConsumptionMaxmA Frequency RangeLowKHz522+/-10 HighKHz1620+/-10 IF Frequency KHz450+/-2 ALIGNMENT PROCEDURES 8 CASSETTE PLAYBACK PERFORMANCE DATA Supply Voltage: AC 230 V Standard Output:500mw Dummy Load:4Ohm 0DB=1V EQ or Tone at Flat Place Bas

39、s OFF Place Tape Speed 4.76cm/sec.1 7/8 I n Measuring ItemsUniteNormLimitSample1Sample2 Tape Speed Enorat 3 KHz% +3/-2 WOW & Flutterat 3 KHz%0.250.35 Play Freq Response at HzdB at 125 HzdB+/-3+/-6 at 1 KHzdB00 at 10 KHzdB+/-3+/-6 at KHzdB P/B S/N (1K odB) DC Opetation dB AC OptetaiondB5040 Min Vol H

40、um & Noise AC Optetaionmv13 Max Vol Hum & Noise AC Optetaionmv2030 10% THD Output (1KHz odB) RMSmw45004000 THDat Hz% -10dB 1KHzat 1 KHz%12 at KHz% Track CrosstalkdB4030 Channel SeparationR-LdB4030 L-RdB4030 Channel Balance -10dB 1KHzdB13 No Signal Current Min. Vol. Blank TapemA Max Output Max. VolA

41、Play Torque g/cm F.F Torqueg/cm Rew Torqueg/cm Time for PlayMin Time for F.F Sec Time for RewSec Play Level Tape = 0dB RefdB00 CD Play 1KHz-10dB dB-2- 4 Radio FM 1KHz 40KHzdB+/-1+/-3 dB+/-1+/-3AUX 500MV ALIGNMENT PROCEDURES 9 CASSETTER REC/PLAY PERFORMANCE DATA Supply Voltage:AC 230 V Standard Outpu

42、t:500mw Dummy Load:4Ohm 0DB=1V EQ or Tone at Flat Place Bass OFF Place Tape Speed 4.76cm/sec.1 7/8 I n Measuring ItemsUniteNormLimitSample1Sample2 Rec Blas System AC KH z5560 Erasing System Magnet6PA Erasing RatiodB3833 ALC Compresion Time for 20dbdB Stansatding up for -20db at 90%Sec Recovery time

43、for -20db at 90%Sec R/P Frep Responseat HzdB REC CD(-20dB)at 100 HzdB+/-3+/-6 100Hz ,1KHz, 10KHzat 1 KHzdB0+/-3 at 10 KHzdB+/-3+/-6 R/P S/N Built MicdB FM 1mv/indB3833 R/P THD at -10dB 1KHz%510 Built in Mic Sens dB Ext Mic Sens dB Line in Sens dB R/P Channal Separation L-R dB4030 (1KHB 0dB)R-L dB403

44、0 Record Level Tape = -10dBdB00 CD 1KHz -20dBdB+/-2+/-4 Radio FM 1KHz 12.5KHzdB+/-2+/-4 Remote Control Sensitivitym75 Headphone Out Level (32 ohm)mW2015 Bass Tone Actionat HzdB Power consumptiomW Prest EQ REF O/P 0dB 100 HzdB+4+/- CLASSIC 1 KHzdB+0.5+/-1 10 KHzdB+3.5+/- 100 HzdB+6+/- ROCK 1 KHzdB+1+

45、/- 10 KHzdB+4+/- 100 HzdB0+/- POP 1 KHzdB+2+/- 10 KHzdB-+/- ALIGNMENT PROCEDURES 10 CD PLAYBACK PERFORMANCE DATA Supply Voltage:AC 230 V Standard Output:500mw Dummy Load:4Ohm 0DB=1V EQ or Tone at Flat Place Bass OFF Place Measuring ItemsUniteNormLimitSample1Sample2 WOW & Flutter% Play Freq Response

46、at 40 HzdB- 2- 3 (0dB)at 61 HzdB- 1- 2 at 127 HzdB0- 1 at 1 KHzdB00 at 10 KHzdB0- 1 at 20 KHzdB0- 3 P/B S/N (YEDS) DC Opetation dB AC OptetaiondB5040 Min Vol Hum & Noise AC Optetaionmv23 Max Vol Hum & Noise AC Optetaionmv58 10% THD Output RMSmw45004000 THD (-20dB)at 1 KHz%13 Channel SeparationR-LdB4

47、030 YEDS (0dB)L-RdB4030 Channel Balance (1KHz -10dB)dB13 Black SpotPHILIPS-444AUM800600 Finger PrintsPHILIPS-444ATRACK1918 InterruptionPHILIPS-444AUM800600 Deflection 731RAMM10.9 Eccentricity712RUM210140 Access OperationFirstSec3 TimeLastSec13 VOLTAGE CHARTS 11 IC VOLTAGE TABLE NO SIGNAL INPUT (EXCEPT FM STEREO BAND), VOLUME MINMUN AC 230V 50Hz PINS12345678910111213141516 AM001.14.64.644.600.44.11.21.200.80.71.1 FM00.8044.33.84.200.53.51.21.23.403.