yacht_boy_80_wr5408pll.pdf

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1、Service Document Exchange Set Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual “Sicherheit“, Material- nummer 720108000001, sowie zustzlich die even- tuell abweichenden, landesspezifischen Vorschrif- ten! The regulations and safety instructions shall be valid as provided by

2、the “Safety“ Service Manual, part number 720108000001, as well as the respective national deviations. S S Service Manual Sicherheit Safety Materialnr./Part No. 720108000001 YACHT BOY 80 WR5408 PLL Dieses Service Dokument ist nur in Datenform verfgbar This Service Document is only available as data n

3、derungen vorbehalten/Subject to alteration Made by GRUNDIG in Germany HS-41 0404 http:/ RadioFans.CNYACHT BOY 80 ALIGNMENT INSTRUCTIONS (1) ALIGNMENT FOR AM IF a. Required Instruments AM IF Sw eep Generator with Scope b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Connec

4、t the input of the AM IF sweep generation in series with a resister of 1.2K Ohm to the test point TP2 and TP7. (3) Connect the RF output of the AM IF sweep generation in series with a resister of 2.2K ohm to another test point TP3. A M T2 (4) Adjust T2 to have a max. output and best center marker fr

5、equency to 450kHz. c. Instrum ent Connection T2IN OUT 1.2K 2.2K RF FM IF Sweep Generator 450KHz Marker Test Point TP2 Test Point TP3(2) ALIGNMENT FOR FM IF a. Required Instruments FM IF Sw eep Generator with Scope b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Connect th

6、e input of the FM IF sweep generation in series with a resister of 1.2k Ohm to the test point TP4 and TP7. (3) Connect the RF output of the FM IF sweep generation in series with a resister of 2.2k ohm to another test point TP5. (4) Adjust T1 have a max. output and best symmetrical S curve with respe

7、ct to the FM T1 Ce nter marker frequency of 10.7MHz. c. Instrum ent Connection T1RF 1.2K IN 2.2K OUT Test Point TP4 Test Point TP5 FM IF Sweep Generator 10.7MHz MarkerRadioFans.CNYACHT BOY 80 (3) ALIGNMENT FOR FM VOLTAGE TUNING RANGE a. Required Instruments DVM b. Alignment Procedure Mode Adjustment

8、 Procedure (1) Set the power switch to ON. (2) Set “ 108 MHz”. (3) Connect at to the test point TP6 and TP7. (4) Adjust L2 for show on 8.5V. L 2 (5) Set “87.5MHz” and check on DVM between 2.2V 2.7V. c. Instrum ent Connection L2Test Point TP6 DVM(4) ALIGNMENT FOR AM VOLTAGE TUNING RANGE a. Required I

9、nstruments DVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Set “ 520 kHz”. (3) Connect at to the test point TP6 and TP7. (4) Adjust T10 for show on 1.10V. T10 VC4 (5) Set “1710 kHz” and adjust VC4 for DVM show on 8.5V. c. Instrum ent Connection VC4 T10Test Po

10、int TP6 DVMRadioFans.CNYACHT BOY 80 (5) ALIGNMENT FOR LW VOLTAGE TUNING RANGE a. Required Instruments DVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Set “ 153 kHz”. (3) Connect at to the test point TP6 and TP7. (4) Adjust T11 for show on 1.20V. T11 VC5 (5) S

11、et “279 kHz” and adjust VC5 for DVM show on 5.00. c. Instrum ent Connection VC5 T11Test Point TP6 DVM(6) ALIGNMENT FOR FM SENSITIVITY a. Required Instruments FM S ignal Generator S SVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Connect a SSVM to the test poi

12、nt TP8 and TP9. (3) Connect the output of the FM signal generator to the test point TP5 and TP7. (4) Set FM 90 MHz. (5) Adjust L1 to have a max. Audio output. (6) Set FM 106 MHz. (7) Adjust VC1 to have a max. Audio output. L1 VC1 (8) Repeat steps 4-7 until best sensitivity on these two frequency is

13、formed. c. Instrum ent Connection L1 VC1Test Point TP5 FM Signal GeneratorTest Point TP8 SSVMRadioFans.CNYACHT BOY 80 (7) ALIGNMENT FOR AM SENSITIVITY a. Required Instruments AM Signal Generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Connect a SSVM

14、to the test point TP8 and TP9. (3) Connect the output of the FM signal generator to the test point TP8 and TP9. (4) Set AM 600 kHz. (5) Adjust L19A to have a max. Audio output. (6) Set AM 1400 kHz. (7) Adjust VC2 to have a max. Audio output. L19A VC2 (8) Repeat steps 4-7 until best sensitivity on th

15、ese two frequency is formed. c. Instrum ent Connection A L19 VC2Loop Antenna The radio is located perpendicularly to the Loop Antenna 60 cm AM Signal GeneratorTest Point TP8 SSVM(8) ALIGNMENT FOR LW SENSITIVITY a. Required Instruments AM Signal Generator SSVM b. Alignment Procedure Mode Adjustment P

16、rocedure (1) Set the power switch to ON. (2) Connect a SSVM to the test point TP8 and TP9. (3) Connect the output of the AM signal generator to a standard loop antenna. (4) Set LW 162 kHz. (5) Adjust L19B to have a max. Audio output. (6) Set LW 270 kHz. (7) Adjust VC3 to have a max. Audio output. L1

17、9B VC3 (8) Repeat steps 4-7 until best sensitivity on these two frequencies is formed. c. Instrum ent Connection B L19 VC3Loop Antenna The radio is located perpendicularly to the Loop Antenna 60 cm AM Signal GeneratorTest Point TP8 SSVMRadioFans.CNYACHT BOY 80 (9) ALIGNMENT FOR SW 2ND LOCAL OSC a. R

18、equired Instruments Fr equency counter with higher impedunce probe b. Alignment Procedure Mode Adjustment Procedure (1) Turn the radio ON. (2) Turn the frequency for away from any station to avoid interference. (3) Connect the test probes of frequency counter to TP10 and TP7. AM T8 (4) Adjust T8 to

19、have a reading of 20.9898 20.9902 MHz. Coution : a loading effect could emerge in the circuit if inserted with a lower impedance probe of frequency C ounter. c. Instrum ent Connection T8Freq. Counter Test Point TP10(10) ALIGNMENT FOR SW SENSITIVITY a. Required Instrum ents AM Signal Generator S SVM

20、b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Tune the radio band frequency to 15.100 MHz. (3) Feed a signal with modulation from the AM signal generator output to tese point TP5 and connect a SSVM to the speaker (TP8). (4) Tune the generator frequency to exactly the sa

21、me as that of the radio frequency Display ed. (5) Adjust T6, T7 and T9. T6 T7 T9 (6) Remove steps (5) until test sensitivity. c. Instrum ent Connection T6 A T7 T9Test Point TP5 AM Signal GeneratorTest Point TP8 SSVMRadioFans.CNYACHT BOY 80 (11) ALIGNMENT FOR SW SENSITIVITY a. Required Instruments AM

22、 Signal Generator S SVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to the ON position. (2) Set the band to SW. SSB switch to ON, and clarify.ur to center position. (3) Feed a signal without modulation from the signal generator to the EXT ANT jack, And connect a SSVM to

23、 the test point TP8. (4) Tune the radio frequency to exactly the same as that of the signal generator. V C6 (5) Adjust VC6 to have a minimum reading on the SSVM. c. Instrum ent Connection VC6Test Point TP5 AM Signal GeneratorTest Point TP8 SSVMRadioFans.CNYACHT BOY 80 RadioFans.CNYACHT BOY 80 RadioF

24、ans.CNYACHT BOY 80 RadioFans.CNYACHT BOY 80 RadioFans.CNYACHT BOY 80 10 RadioFans.CNYACHT BOY 80 RadioFans.CNYACHT BOY 80 ( 1 ) Weak sensitivity in FM mode Check whether the sensitivity is recovered if antenna is directly Yes Check the antenna terminal and connected to the point between antenna circ

25、uit. D2 and C5. No Yes Check IF waveform. Check Q2 and IC2. Y es N o Check IC1 and Q1. Check the PLL circuit. ( 2 ) Weak sensitivity on SM band Yes Is the reception in MW/LW band O.K.? Check the antenna circuit and antenna terminal. No No Yes Check whether both the VCO and the 2nd OSC are normal. Ch

26、eck whether the AGC circuit is normal. No Check D6, C82, C83 and Q22. Check whether the circuit of the 2 nd IF stage(450 kHz) is normal. Yes No Check Q17, Q18, and Q21. Check whether the circuit of the 1 st IF stage (21.44MHz) is normal. Y es Check Q12 and the low-pass fiter filter circuit (L5, L8,

27、L9). TROUBLESHOOTING FLOW CHART TROUBLESHOOTING FLOW CHART ( 3 ) PLL does not work Check whether the gate voltage of Q30 is more than 8.5V DC No Check whether the problem comes while the display is 29.999 MHz in from the DC-DC converter. the SW band. Yes Check whether the frequency at the No Check w

28、hether the OSC circuit Of collector of Q13 is within 51.43875 Q14 and the two buffer circuits Of 51.43925 MHz. Q13 and Q15 are normal. Yes No Check Q208 and Q209. Check whether the LPF circuit is normal. Yes Check the Q204 and IC201. RadioFans.CNYACHT BOY 80 ( 4 ) Power cannot be turned on No Check

29、whether IC201 pin 58 is 3V DC. Check whether IC201 pin 45 is 3V DC. Yes No No Check whether the collector voltage of Q36 is less than 0.2V DC. Check safety switch SW201 and the circuits of the key matrix. No Check Q36. Check Q201. Yes Check whether the collector voltage of Q37 is more than 5.8V DC. No Check Q37. RadioFans.CN