Goodmans-GMS880-cs-sm 电路图 维修手册.pdf

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1、Service Manual - GMS880 GMS880 Service Manual - GMS880 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 AM/FMTUNER SECTION DISASSEMBLY INSTRUCTIONS- 3 ADJUSTMENT LOCATIONS-4 ALIGNMENT

2、 PROCEDURES-5 - 10 IC BLOCK DIAGRAMS-13 - 17 VOLTAGE CHARTS-11 - 12 BLOCK DIAGRAM-18 WIRING DIAGRAM-19 PRINTED CIRCUIT BOARDS-24 -26 SCHEMATIC DIAGRAMS-20 - 23 EXPLODED VIEW/PARTS LIST (CABINET)-27 - 30 IMPORTANT SERVICE SAFETY INFORMATION-2 ANTENNA SYSTEM FM: LEAD WIRE AND 75 OHM JACK TUNING RANGE

3、FM: 88 - 108 MHz AUDIO SECTION SPEAKER IMPEDANCE : 4 OHM GENERAL: 2W x 2 POWER INPUT: AC 230V-50Hz AC POWER CONSUMPTION MAIN DIM: 154(L)x218(W)x 221(H)mm WEIGHT: 4.0Kg NOTE: All the specifications and features are subject to change without notice. SERVICE PUBLICATION AM: 540 - 1600 kHz AM: FERRITE B

4、AR SPEAKER DIM: 138(L) x186(W) x221(H)mm PORTABLE RADIO CASSETTE WITH CD PLAYER RadioFans.CN 收音机爱 好者资料库 2 IMPORTANT SERVICE SAFETY INFORMATION ANTENNA TERMINAL OHMMETER OM EXPOSED METAL PART TEST ALL EXPOSED METAL SURFACES (READING SHOULD NOT BE ABOVE 0.5mA) LEAKAGE CURRENT TESTER EARTH GROUND DEVIC

5、E 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 and mechanical parts have special safety related characteristics which are often not evident from visual inspection. Nor can the protection they give nec

6、essarily be obtained by replacing them with components rated for higher voltage , wattage, etc. Parts that have special safety characteristics are identified by aon schematic and parts list. Use of a substitute replacement that dose not have the same safety characteristics as the recommended replace

7、ment part might create shock, fire, and/or other hazards. Product safety is under review continuously and new instructions are issued whenever Appropriate. 3. Servicing precautions CAUTION: before servicing the unit covered by this service by this service manual and its supplements. Read and follow

8、the SAFETY PRECAUTIONS on this page. NOTE: if unforeseen circumstances create a conflict between the following servicing precautions and any of the Safety precautions, always follow the safety precautions. Remember: safety first. General servicing precautions. a. Always unplug the unit s AC power co

9、rd from the AC power source Before: (1)removing or reinstalling any component, circuit board, module or any other unit assembly. (2)disconnecting or reconnecting any unit electrical plug or other Electrical connection. (3)connecting a test substitute in parallel with an electrical capacitor caution:

10、 a wrong part substitution or incorrect polarity installation Of electrolytic capacitors may result in an explosion hazard b. Do not defeat any plug/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

11、 electrical assemblies unless all solid-state device heat sinks are correctly installed. d. Always connect a test unit instrument s ground lead to 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 CON

12、TROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES HEREIN MAY RESULT IN HAZARDOUS RADIATIONEXPOSURE. DANGER:IF INTERLOCK FAILS OR IS DEFEATED, THE LASER LIGHT IS ABLE TO FUNCTION. THE LASER IS INVISIBLE, AVOID DIRECT EXPOSURE TO BEAM. 4. Laser precautions Warning! (1)When servicing.(Incase it isnecessa

13、ry to confirmlaser Beam emission ) besure not toplace your eyesany closer than1or 30cm from thesurface ofthe objective lens on the opticalpickup block. HANDLING THE LASERPICKUP ( 2)Laser Diodesare Extremely Susceptibleto damage from staticelectricity even ifa static dischargedies not ruin the diode,

14、 itcanshorten its lifeor cause itto work improperly.When replacing the pickup, usea conductive maton the floorand desk andwear a wrist band connected to groundthrough a 1Mohm resistor toprotect the laserdiode from staticdamage. If thelens should getdusty, blow off thedust carefully fromthe object. (

15、3)There areno adjustable partsin the pickupassembly. If it is defective,replace the wholepickup assembly. 1. SAFETY PRECAUTIONS Before returning a 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 prote

16、ctive devices are defective and/or have been defeated during servicing. (1)protective shields are provided to protect both the technician and the customer. Correctly replace all missing protective shields including any removed for servicing convenience. (2)when reinstalling the chassis and/or other

17、assemblies in the cabinet, be sure to put back in place all protective devices, including , but not limited to , nonmetallic control knobs, insulating fishpapers. adjustment and compartment covers/shields and isolating resistor/ capacitor networks. Do not operate this or permit it to be operated Wit

18、hout all protective devices correctly installed and functioning . b. Be sure that there are no cabinet openings through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, excessively wide cabinet ventilation s

19、lots, and an improperly fitted and/or incorrectly secured cabinet back cover. c. Leakage current hot check - with the unit completely reassembled ,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

20、system that complies with American National standards Institute (ANSI) C101.1 Leakage Current for Appliancesand Underwriters Laboratories(UL) 1410 (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.

21、) To all exposed metal parts of the Unit (antennas, handle bracket, metal cabinet, screw heads , metallic overlays, control shaft, etc.) Especially 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 c

22、ord plug in the outlet and repeat test . ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HERENING INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED RETURNING THE UNIT TO THE CUSTOMER. d. Insulation resistance test cold check: unplug the power supply cord and connect a jumper wire between th

23、e 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 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 t

24、o 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 not 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 cust

25、omer. RadioFans.CN 收音机爱 好者资料库 DISASSEMBLY INSTRUCTIONS 3 SCREW 3 x10 KA SCREW 3 x12 KMSCREW 3 x10 PA ADJUSTMENT LOCATIONS 4 ALIGNMENT PROCEDURES 5 FM AND AM RF ALIGNMENT CHART IF StepItemInput CircuitOutput CircuitTunerAdj -Adjustment SetupSetupsettingPoint Unless otherwise specified set switches as

26、 follows: FM Function: FM Adjust generator frequency to a center of the FM band where no FM brodcast exists IFConnect FM IFConnect C519 and GNDFM in bandT201Adjust for straight and ?Adjustmentsweep output IF-OUT terminal toendT503symmetrical S-curve terminal to IC501 IF sweep input terminalAdjust wi

27、th max.amplitude. ?FMHeadphone jack or 87.5 MHzL502Adjust for max output Bandspeaker terminal108.5MHzPVC201-FC1 Adjust for max output FM SG ANT.Headphone jack or 90 MHZL501Adjust for max.output and ?Tracking (1)Terminal 90 MHz,speaker terminalMONObest waveform 1kHz, +-22.5kHz dev ?Tracking (2)106 MH

28、z, 1 kHzHeadphone jack or 106MHzPVC201-FC2 Same as above. +-22.5 MHz devspeaker terminal ?Repeat steps 3 and 4. AM IFConnect standard loopConnect input terminal AM in band Adjust tor max. amplitude ?Adjustmentantenna to output ter-genescope to detector end?with symmetrical 455kHz. minal of genescope

29、output ?AMHeadphone jack or 520 kHzT505Adjust for max output Bandspeaker terminal1630 kHzPVC201-C2 Adjust for max output ?Tracking (1)600 kHz 400 kHz,Headphone jack or 600 kHzL506Adjust for max.output and 3% modspeaker terminalbest waveform ?Tracking (2)1400kHz 400 kHz,Headphone jack or 1400 kHzPVC2

30、01-C1 Same as above. 3% modspeaker terminal ALIGNMENT PROCEDURES 6 FM RECEIVER PERFORMANCE DATA 2000mW NORMAL Band:FM Supply Voltage: DC 12V /AC:Measured By: Standard Output: 50mw Dummy Load: 4ohmApproved By: Modulation: 1 KHz 22.5 KHZ DEV Measuring ItemsUniteNormLimitSample1 Sample2 Max.90 MHzdb Se

31、nsitivity98 MHzdb 106 MHzdb 30db Quieting90 MHzdb2026 Sensitivity98 MHzdb2026 106 MHzdb2026 Image RejectionAT 106 MHzdb2520 IF RejectionAT 90 MHzdb5042 AFC Holding 1mv I/p+SideKHz200400 Range-3db-SideKHz200400 -3bd Limiting Sens .1mv I/Pdb1822 AM Suppression1mv I/Pdb3530 S/N1mv I/Pdb4540 Stereo Sens

32、db1522 Stereo Lamp On Sens.db2024 Separation R/Ldb2822 Audio Freq.LowHz80100 Response -3dbHighKHz65 Modulation Hum1 mv I/Pdb4236 Hum & Noise(min.vol.)mv13 THD10% Output PowermW ?1800 Max. Output(40KHz DEV)mW ?1800 Total Harmonic Distortion 1 mv I/P%13 OSC Drop Out1 mv I/PV160180 CurrentNo signalmA C

33、onsumptionMaxmA Frequency Range Low MHz 87.35 +/-0.4 High MHz 108.35 +0.5 -0.2 IF Frequency MHz 10.7 +/-0.1 ALIGNMENT PROCEDURES 7 MW RECEIVER PERFORMANCE DATA 2000mW (NORMAL Band:MW Supply Voltage: DC12V/AC:Measured By: Standard Output: 50mw Dummy Load: 4ohmApproved By: Modulation: 1 KHz 30% EQ OR

34、Tone AT Center Place Measuring ItemsUniteNormLimitSample1 Sample2 Max.600 KHzdb Sensitivity1000 KHzdb 1400 KHzdb 20db Quieting600 KHzdb8489 Sensitivity1000 KHzdb8489 1400 KHzdb8489 S/N 5mv/Mdb3530 ACA+10 KHzdb1512 -10 KHzdb1512 Image RejectionAT 1400 KHzdb3530 IF RejectionAT 600 KHzdb5045 Band Width

35、 -6db+SideKHz310 -SideKHz310 Tweet 50mv/M2IF%510 AGC FOM - 10db 100mv/Mdb3530 Audio Freq.LowHz100100 Response -3dbHighKHz2.52.2 Modulation Hum 100 mv /M db 30 25 Hum Volume At Min mv 1 3 THD10% Output PowermW ?1800 Max. Output 60% MOD mW ?1800 Total Harmonic Distortion 5 mv /M%13 CurrentNo SignalmA

36、ConsumptionMaxmA Frequency Range Low KHz 520 +/-10 High KHz 1630 +30 -20 IF Frequency KHz 455 +/-5 ALIGNMENT PROCEDURES 8 CASSETTE PLAYBACK PERFORMANCE DATA 2000mW NORMAL Supply Voltage: DC12V/AC: Standard Output: 50mwMeasured By: Dummy Load: 4Ohm 0 DB = 1V Tone : CenterApproved By: Tape Speed 4.76c

37、m/sec.1 7/8 in Eq. at center PT. Measuring ItemsUniteNormLimitSample1 Sample2 Tape Speed ErrorHz3000+90/-60 WOW & Flutter%0.250.35 Play Freq Response at Hzdb at 125 Hzdb+/-3+/-6 HEAD:KS-211at 1 KHzdb00 at 10 KHzdb+/-3+/-6 at KHzdb P/B S/N DC Opetation db 1KHZ 0dB AC Optetaiondb4540 Min Vol Hum & Noi

38、se AC Optetaionmv13 Max Vol Hum & Noise AC Optetaionmv3050 THD10% Output Power RMS mw ?1800 Max Output RMS mw ?1800 THDat Hz% at Hz% at 1 KHz%23 at KHz% at KHz% Track Crosstalkdb4035 Channel SeparationR - Ldb3025 L - Rdb3025 Channel Balancedb13 No Signal Current Min. Vol. Blank TapemA Max Output Max

39、. VolA Play Torque g/cm30-80 F.F Torqueg/cm45-125 Rew Torqueg/cm45-125 Time for PlayMin Time for F.F Sec180 Time for RewSec30 VOLTAGE CHARTS 11 IC VOLTAGE TABLE DC12V,NO SIGNAL INPUT (EXCEPT FM STEREO BAND),VOLUME MINMUN AC 230V 50HZ TC94A29F-400 TA2157FN & MM1469 TA2180&TA8227P&PT2253&KA22241 PINS1

40、2345678910111213141516 U103MOTOR3.43.42.12.101.77.802.12.13.43.4070.81.2 MM1469 PINS171819202122232425262728 MOTOR2.64.32.42.17.87.82.12.12.13.43.40 PINS12345678910111213141516 U102CD3.281.621.641.631.6302.601.581.641.641.042.81.641.641.64 TA2157FN PINS1718192021222324252627282930 CD0.11.631.181.742

41、.370.761.640 PINS12345678910111213141516 standby003.23.52003.13.201.50003.7800.29 CD2.952.932.953.32003.12.9501.37002.933.6800 PINS17181920212223242526272829303132 standby0.040.030.030.03000000000000 CD1.6201.493.320.9701.531.633.281.641.630.721.641.041.641.63 U101 PINS333435363738394041424344454647

42、48 TC94A29F-400 standby00000003.23.20.2000000 CD1.641.641.741.580.011.641.642.951.321.303.21.601.61.6 PINS49505152535455565758596061626364 standby3.190.861.71.591.591.591.591.61.61.61.591.61.61.61.61.6 CD2.950.71.571.461.461.461.461.471.471.471.471.471.471.471.471.47 PINS standby CD PINS standby CD

43、PINS standby CD VOLTAGE CHARTS 12 IC30512345678910111213141516 PT225303.33.33.33.33.36.86.86.86.83.33.33.33.33.36.8 IC201123456789 KA222411.901.9006.51.9201.9 IC306PINS1234567891011121314 TA8227105.39.7000.6000.55.509.75.311.5 PINS123456789101112 AM001.073.63.62.953.6300.223.061.221.25 PINS131415161

44、718192021222324 IC501AM00.720.711.060.90.072.93.623.623.623.623.62 TA2180PINS123456789101112 FM00.770.013.23.42.83.3002.61.21.2 PINS131415161718192021222324 FM2.52.770.71.010.90.12.63.33.33.33.33.3 REAMK:ALL THE DATA IN THE TABLE ARE FOR REFERENCE ONLY FOR FM ST BAND, FM STEREO INDICATOR MUST BE ON.

45、 13 IC BLOCK DIAGRAM 14 IC BLOCK DIAGRAM PT2253A TA8227P 15 IC BLOCK DIAGRAM LCD output P7-2/INTR/SO2? P7-0/SCK2/TX2? ? P1-0/SCK1/TX1/Ctin/DATA? ? MVDD P6-2/S15/ADin3/SBOK?!? P5-3/S12/AOUT?!?# P7-1/SDIO2/RX2? P1-1/SDIO1/RX1/SFSY? ?$?%? MVSS P6-3/S16/ADin4/CLCK?&?#?&? ?(?)?# ? ?*?+,!-? P6-0/S13/ADin1

46、/DOUT,?# ?.?,? ?.?+?/?#? FOO RFGC SEL DMO XO CVSS DVSS TRO FMO TEBC CVDD XI DVDD RO LO DVR TC94A29FAG/FB-400 (SVFP64pin) MCU OscillatorMCU Power supply TEI TEZI SBAD FEI RFRP VREF RFZI AVDD RFI SLCO AVSS VCOF LPFO TMAX PDO LPFN Xin 75KHz P8-0/MXI/O /RESET Xout 75KHz P8-1/M P2-0/COM1 P2-1/COM2 P2-3/C

47、OM4 P2-2/COM3 TEST/P3-0/S1 P3-1/S2 P3-2/S3 P3-3/S4 P4-0/S5 P4-1/S6 P4-3/S8 P5-0/S9 P4-2/S7 1720242832 33 36 40 44 48 4952566064 1 4 8 12 16 16 IC BLOCK DIAGRAM TA2157F/FN Block Diagram PIN VCTRL SEL (APC SW) TEB (TE BAL) RFGC (AGC Gain) GVSW VCC APC ON50%+12dB Normal mode (0dB) HiZ APC ON0%+6dB Normal mode (0dB) GND APC OFF (LDO = H) +50% 0dB