djg5_SM.pdf

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1、DJ-G5 Service Manual CONTENTS + SPECIFICATIONS2+ PARTS LIST RF Unit3740 IF Unit4144 + CIRCUIT DESCRIPTION CPU Unit4446 1) Receiver System35 SVV UniL46 2) Transmitter System5 UVCO Unit46 3) PLL Synthesizer Circuit6 VVCO Unit47 4) CPU and Peripheral Circuit67 CHARGE Unit47 5) Terminal function of CPU1

2、012 PTT Unit47 6) Terminal function of 409413 Mechanical Parts48 7) Frequency Table13 + SEMICONDUCTOR DATA+ ADJUSTMENT l) AK234114 1) Required Test Equipment49 2) BU4094BF15 2) Adjustment for DJ-G5T/E50 3) HD643387716 3) Adjustment Points51 4) LC75366M17 5) LC73881 M18 6) M64076GP19+ PC BOARD VIEW 7

3、) MC3372VM20 1) RF Unit Side A52 8) NJM21 00V20 2) RF Unit Side B53 9) NJM2070M21 3) IF Unit Side A54 10) RH5RH501A22 4) 1F Unit Side B55 11) RH5RH651A22 5) CPU Unit Side A56 12) S-80730SL-AT23 6) CPU Unit Side B57 13) S-AV2824 7) UVCO Unit58 14) S-AU5724 8) VVCO Unit58 15) S-81237SG-QE25 9) PTT Uni

4、t Side A58 16) TA75S01F25 10) PTT Unit Side B58 17) TA75W01FU26 11) CHARGE Unit58 18) TC4W53F26 12) SW Unit Side A58 19) TK10930VTL27 20) uPD1 6430AGF-3B928 21) 24LC16B29+ VOLTAGE TABLE 22) Transistor, Diode and LED Outline Dra30 1) Diode5960 23) LCD Unit3132 2) IC6063 3) Transistor6364 + EXPLODED V

5、IEW 1) Charge Unit33+ BLOCK DIAGRAM6667 2) RF Unit34 3) IF Unit/CPU Unit35 4) Front/Rear View36+ SCHEMATIC DIAGRAM 1) RF Unit6869 2) IF Unit7071 3) CPU Unit7273 4) UVCO Unit74 5) VVCO Unit75 6) CHARGE Unit76 7) PTT Unit76 ALINCO INCORPORATED TWIN 21 M.I.D. TOWER BUILDING 23F, 1-61, 2-CHOME, SHIROMI

6、CHUO-KU , OSAKA, 540-8580 JAPAN Tel (81)6-6946-8150 fax (81)6-6946-8175 e-mail: exportalinco.co.jp General VHFUHF DJ-G5TL-band 108.000173.995 (AM FM) 420.000479.995 (FM) Receiver range(MHz)R-band 1 30.000l 73.995 (FM) DJ-G5E144.000145.995 430.000439.995 Transmitter range(M DJ-G5T144.000147.995 438.0

7、00449.995 DJ-G5E144.000145.995 430.000439.995 Modulation Antenna impedance Operating temperature range Supply voltage (rated voltage) External (V) Ni-Cd(V) Tx Hi: 13.8VDC(external)approx. 1.4Aapprox. 1.5A Tx Hi: 9.6VDC(Ni-Cd)approx. 1.4Aapprox. 1.5A Tx Hi: 7.2VDC(Ni-Cd)approx. 1.4Aapprox. 1.5A Tx Hi

8、: 4.8VDC(Ni-Cd)approx. 1.0Aapprox. 1.2A CurrentTxMid: 4.8VDC(Ni-Cd) (regulated supply voltage)TxLo: 4.8VDC(Ni-Cd) Rxsquelched(twinband) Rxsquelched(monoband) Rx Battery-Save On (800/200 twin band) Ground Microphone impedance Dimensions without projection (with projections) Weight (Ant. belt-clip, st

9、rap, and Ni-Cd EBP-33N inclusive) Transmitter Hi: 13.8VDC(external)approx. 5W Power outputHi: 9.6VDC(Ni-Cd)approx. 4.5W (regulated supply voltage)Hi: 7.2VDC(Ni-Cd)approx. 3.5w approx. 3W Hi: 4.8VDC(Ni-Cd)approx. l.5Wapprox. 1 W Modulation Maximum deviation Spurious emission Receiver SystemDouble-con

10、version superheterodyne First l.F.38.9MHz45.1 MHz Second l.F. Sensitivity L-band: 144.000147.995MHz R-band: 438.000449.995MHzbetter than -16dBubetter than -15dBu DJ-G5T L-band: 438.000449.995MHz R-band: 144.000147.995MHz L-band: 144.000145.995MHz R-band: 430.000439.995MHzbetter than -16dBubetter tha

11、n -15dBu DJ-G5E L-band: 430.000439.995MHz R-band: 144.000145.995MHz Squelch sensitivity Selectivity (-6dB/-60dB) A.F.output(10% distortion) 455kHz Variable reactance +/-5kHz notmorethan-60dB approx. 0.8A approx. 0.5A approx. 85mA approx. 50mA approx. 350g F2E.,F3E(FM) 50 ohm -10 +60*C 4.516.0(13.8)

12、4.516.0(4.8) approx. 25mA Negative ground 2k ohm W57(63) x H138(155) x D27.5(31.5) 100mW(8ohm load) better than-12dBu better than -12dBu better than-20dBu (0.1uV) more than 12kHz / less than 30kHz CIRCUIT DESCRIPTTON 1) Receiver System The receiver system is the double-conversion superheterodyne. ln

13、 L band the first IF is 38.9MHz and second IF is 455kHz, and in R band the first IF is 45.1MHz and second IF is 455kHz. 1 Front End 1-1 108.00MHz 173.995MHz (144M Band Main) The receiving signal is passed through the low-pass filter (L90, L91 , L92, C220, C229, C230, C231, C235), and amplified in RF

14、 amplifier (Q77), then led to the resonant circuit (L85, L86, varicap D68, D69). The signal is amplified in RF amplifier Q75, and passed through the resonant circuit (L81 , L82 varicap D66 and D67), then converted into the frequency of 38.9MHz in the mixer Q79. Two resonant circuits consisting of L8

15、5, L86, varicap D68, D69, L81 , L82, varicap D66, D67, are controlled by the trucking voltage to obtain the best condition to the receiving frequency. The local signal from VVCO OUT is passed through the buffer Q79, and fed to the base of the mixer Q76. The sum of the displayed frequency and IF freq

16、uency is employed. 1-2 420.00MHz51 1.995MHz: (430M Band Sub) The receiving signal is passed through the band-pass filter (C59, C60, C61 , C66, C67, C68, L57, L58, L53, L54), RF amplifier (Q62, Q72), band switch (D63), and high-pass filter (C175, C176, C186, C187, L77, L78), and converted into the fr

17、equency of 38.9MHz in mixer (Q74). The local signal is passed through the buffer (Q70), and the difference frequency between IF frequency and the displayed frequency is fed to the base of the mixer (Q74). 1-3 130.00MHz173.995MHz (144M Band Sub) The receiving signal is passed through the low-pass fil

18、ter (L90, L91 , L92, C220, C229, C230, C231 and C235), and RF amplifier (Q68), low-pass fitter (C145, C146, C153 and C154), then converted into the frequency of 45.1MHz in the mixer (Q67). The local signal is passed through the buffer (Q69), then the sum of displayed frequency and IF frequency is fe

19、d to the base of the mixer (Q67). 1-4 420.00MHz51 1.995MHz (433M Band Main) The receiving signal is passed through the band-pass filter (C59, C60, C61 , C66, C67, C68, L57, L58, L53, L54), RF amplifier (Q62, Q72) and the band-pass filter (FL51), and amplified in RF amplifier (Q63), then converted in

20、to the frequency of 45.1MHz. The band-pass filter (FL51) is the helical filter to obtain the band width characteris- tics. The local signal from UVCO OUT is passed through the diode switch (D58), buffer (Q64), then the difference frequency between the displayed and IF is fed to the base ofthe mixer

21、(Q61). 2 IF 2-1 L Band The sum/difference between the receiving signal and local signal is made in each mixer. The crystal filter (XF53) selects the difference of 38.9MHz and eliminates unwanted signal, then it is amplified in the first IF amplifier (Q78). 2-2 R Band The sum/difference between the r

22、eceiving signal and local signal is made in each mixer. The crystal filter (XF51) selects the difference of 45.l MHz and eliminates unwanted signal, then it is amplified in the first IF amplifier (Q60). 3 3 Demodulation 3-1 L Band After amplified in the first IF amplifier (Q78), the signal is fed to

23、 the demodulation IC (IC302) Pin24. The first IF signal outputted to Pin24 (38.9MHz) is mixed in the mixer of IC302 with the local signal of 38.455MHz which is oscillated in the oscillation circuit of IC302 and the crystal oscillator (X303), then converted into the second IF signal of 455kHz. The se

24、cond IF is supplied from the IC302 Pin3. After eliminating unwanted signal by the ceramic filter (FL302), the signal is applied to Pin5 and Pin7. As for the FM demodulation, the second IF signal applied to Pin7 is demodulated in limiter amplifier and quadrature detection circuit of IC302 when IC302

25、Pinl4 is open, and it is outputted from Pinl2 as the audio signal. As for the AM demodulation, the second IF signal applied to Pin5 is demodulated in AM amplifier and AM detection circuits of IC302 when the voltage of IC302 Pin14 is low, and it is outputted from Pinl3 as the audio signal. 3-2 R Band

26、After amplified in the first IF amplifier (Q60), the signal is applied to the demodula- tion lC301, Pinl6. It is mixed in the mixer of IC301 with the local signal of 45.555MHz which is oscillated in the oscillation circuit and the crystal oscillator (X301) of IC301, then converted into the second IF

27、 signal of 455kHz. The second IF is outputted from IC301 Pin3, and applied to Pin5 and Pin7 after eliminating unwanted signal by the ceramic filter (FL30l). 4 Audio Circuit 4-1 FM (L bandThe audio signal supplied from IC302 is pre-emphasized white transmitting. So the audio frequency should be compe

28、nsated in the de-emphasis circuit (R366, C363), then the signal is passed through FM/AM selection switch (IC303). The frequency of 300Hz or below is cut in the audio high-pass fitter circuit (Q313), and it is applied to the electronic volume (IC304) Pin1. The signal is passed through the buffer (IC3

29、06), and adjusted the volume, then led to the audio power amplifier (IC307) to drive the speaker. 4-2 AM (L bandWhen AM mode is selected, the switching transistor (Q312) is turned ON, and IC302 Pin14 becomes low, then AM demodulation circuit of IC302 is activated. The audio signal provided from IC30

30、2 Pin14 is passed through the de-emphasis circuit (R362, C360), and FM/AM selection switch (IC303), then led to audio high- pass filter circuit (Q313), electronic volume (IC304), buffer (IC306) and the audio power amplifier (IC307) to drive the speaker. Note: The FM detection circuit in IC301 (TK109

31、30) is operating even while AM receiving. (The squelch circuit is activated by FM detection output.) So the FM audio is not outputted by FM/AM selection switch (IC303). 4-3 FM (R band) The audio signal supplied by IC301 Pin9 is compensated the audio frequency characteristics in de-emphasis circuit (

32、R330, C327), and the signal is passed through the audio high-pass filter (Q306), then applied to the electronic volume (IC304) Pin20. It is passed through the buffer (IC305), and led to the audio power amplifier (IC307) to drive the speaker. 5 Squelch Circuit 5-1 L Band A part of the audio signal of

33、 IC302 Pin12 is selected and amplified by the noise amplifiers in R351 , R352, R350, R353, C351, C352, C353, and IC302. Then it is supplied from IC302 Pin20 to be amplified again in the noise amplifier (Q309). The amplified noise factor is rectified in D302, adjusted the level in VR303, and applied

34、to CPU (IC508) Pin96, then converted to the digital signal. 4 5-2 R Band A part of the audio signal of IC301 Ping is selected and amplified by the noise amplifiers in R316, R317, R318, R319, C318, C319, C320, and IC301. Then it is supplied from IC301 Pin11 to be amplified again in the noise amplifie

35、r (Q303). The amplified noise factor is rectified in D301 , adjusted the level in VR30l , and applied to CPU (IC508) Pin97, then converted to the dligital signal. 6 Attenuator Circuit 6-1 VHF Band When the ATT key is pressed, L is applied from shift resistor (IC52) Pin14, and D71 is turned ON, then

36、the Attenuator circuit (Q56, R151, C194, R160) is acti- vated. The receiving signal passed through the low-pass filter is attenuated approximately 15dB by the attenuator to decrease the interference of the adjacent channel, etc. 6-2 UHF Band When the ATT key is pressed, L is applied from shift resis

37、tor (IC52) Pin13, and D55 is turned ON, then the Attenuator circuit (Q56, R73, C90, R80) is activated. The receiving signal passed through the low-pass filter is attenuated approximately 15dB by the attenuator to decrease the interference of the adjacent channel, etc. 2) Transmitter System 1 Demodul

38、ation Circuit The voice is converted into the electric signal by the internal or external micro- phone, then it is applied to the mic amplifier (IC310). This IC310 has two opera- tional amplifiers. The pre-emphasis and IDC consist of Pin1, 2 and 3, and the splutter filter consists of Pin5, 6 and 7.

39、The output from the microphone amplifier is passed through variable resistors VR305 and VR306 for maximum deviation adjustment to cathode of varicap diode of the VCO, controlling the VCO frequency and so producing a frequency-modula- tion. 2 Power Amplifier 2-1 The transmitting signal oscillated in

40、VVCO is amplified in pre-drive amplifier (Q81) and drive amplifier (Q80), then fed to the power module (IC54). The transmitting signal amplified in IC54 is supplied to the antenna after attenuated the harmonics enough in the antenna switch (D72) and the Low-pass filter (L90, L91 , L92, C220, C229, C

41、230,C231 , C235). 2-2 The transmitting signal oscillated in UVCO is amplified in pre-drive amplifier (Q54) and drive amplifier (Q53), then fed to the power module (IC51). The transmitting signal amplified in IC51 is supplied to the antenna after attenuated the harmonies enough in the antenna switch

42、(D52), and the bandi)ass filter (L57, L58, L53, L54, C59, C60, C61, C66, C67, C68). 3 APC Circuit 3-1 VHF Band A part of transmitting voltage from low-pass filter is detected by D74, and con- verted into the DC voltage. The converted detection voltage is differential ampli- fied, and the output volt

43、age controls the bias voltage of power module (IC54) Pin2 to fix the transmitting power. 3-2 UHF Band A part of transmitting voltage from low-passS filter is detected by D56, and con- verted into the DC voltage. The converted detection voltage is differential ampli- fied, and the output power contro

44、ls the bias voltage of power module (IC51) Pin2 to fix the transmitting power. 5 3) PLL Synthesizer Circuit 1 PLL The data is sent to the PLL IC (IC53) Pin2 and the clock is sent to Pin3 from CPU (IC508), then the ratio of the division is decided each in L band and R band. Each VCO oscillating signa

45、l is amplified in the buffer (Q73: L band, Q66: R band), and the signal in L band is applied to Pin15, then the signal in R band is applied to Pin6. The programmable divider of IC53 is determined by frequency data, and it divides (1/N) input signal of IC53. Resulting signal will be 5kHz or 6.25kHz.

46、2 Reference frequency division The reference frequency of 5kHz or 6.25kHz according to the channel step is produced by dividing the reference oscillation 12.8MHz (X51) by 2560 or 2048, the data from CPU (IC508). The channel steps of 5kHz, 10kHz, 15kHz, 20kHz, 25kHz, 30kHz and 50kHz use the reference

47、 frequency of 5kHz, and the channel step of l2.5kHz uses the reference frequency of 6.25kHz. 3 Phase comparator The reference frequency of IC53 is 5kHz or 6.25kHz. The VCO output frequency divided by N is compared with 5kHz or 6.25kHz in the phase comparator. 4 PLL Loop Filter Circuit If the phase e

48、rror should occur in PLL, the charge pump of IC53 Pin13 (L band) and Pin8 (R band) outputs the pulse. The signal is converted into the DC voltage in PLL loop filter, then inputted to the varicap of each VCO unit. 5 VVCO Circuit (VHF Band) Q705 is turned ON, and the desired frequency is oscillated in

49、 the Colpitts osclllator consisting of Q701. The frequency control voltage is apprled to the varicap (D702, D703), and the osciflating frequency is changed, then amplified in VCO buffer (Q703), and outputted from the VCO unit. 6 VVCO Circuit (UHF Band) Q704 is turned ON, and the desired frequency is oscillated in the Colpitts oscillator consisting of Q702. The frequency control voltage is applied to the varicap (D704, D705), and the oscillating frequency is changed, then