Adcom-GTP502-pre-sm维修电路图 手册.pdf
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1、details you can hear SERVICE MANUAL STEREO TUNER PRE-AMPLIFIER GTP-502 TABLE OF CONTENTS Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14 IC Block Diagram . . . . . . . . . . . . . . . . . . . . .15-18 Wiring D
2、iagram . . . . . . . . . . . . . . . . . . . . . .19-20 PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . .21-28 Schematic Diagram . . . . . . . . . . . . . . . . . . .29-42 Technical Specification . . . . . . . . . . . . . . . . .43-44 10 TIMBER LANE MARLBORD N.J. 07746, USA PHONE: (732) 6
3、83-2356 FAX: (732) 683-2358 web: http: / RadioFans.CN 2 ADJUSTMENTGTP-502 Preparation 1. INPUT - FM mono:1kHz, 75kHz devi., 60dB/V - FM stereo:1kHz, 67.5kHz devi., 60dB/V Pilot signal 19kHz 7.5kHz devi. - AM:400Hz, 30%mod. 1. FM ADJUSTMENT 2. OUTPUTS - Connect the non-inductive type resistor of 8 oh
4、ms to all speaker terminals otherwise noted. Item FM IF/RF Stereo Distortion Stereo Separation Muting Level Signal output Step 1DC voltmeterL941 0100mV 3 Distortion analyzer Distortion analyzer Oscilloscope Oscilloscope L942 R956 R941 Minimum Minimum 2AC voltmeter IFT on the front end IFE on the fro
5、nt end Maximum Maximum Connection of instrument Fig.1 Fig.2 Fig.2 Fig.1 Channel L or R 1kHz 99.0MHz 1kHz 75kHz devi. 65dBf (60dB) 99.0MHz Ext. mod. 65dBf (60dB) FM SG output Stereo mod- ulator output Tuning frequency 99.0MHz 99.0MHz Channel L or R 1kHz 99.0MHz Ext. mod. 65dBf (60dB) 99.0MHz 1KHz 75K
6、Hz devi 33dB 99.0MHz mod.65dBf (60dB) 99.0MHz 18dB 99.0MHz 99.0MHz Pilot Suppression Signal Strength Indicator Minimum 8 bars just lit VTVM VFD Signal Bars L903 FOR L L904 FOR R R951 Channel L or R pilot on signal Fig.2 Fig.1 99.0MHz 99.0MHz Output indicator Adjustment point Adjust for Remarks FM MU
7、TE/MODE switch: ON/AUTO Repeat the steps 1 to 3 until no fur- ther adjustment is necessary. FM MUTE/MODE switch: ON/AUTO Dont turn more than +/-180 Repeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum. Adjust such that output just unmute 2. AM ADJUS
8、TMENT 120V model Step 1 2 3 530kHz 600kHz 990kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block M971 OSC coil on RF block M971 Adjust for 1.350.2V Maxim
9、um Maximum Step 1 2 3 522kHz or 531kHz 603kHz 999kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block M971 OSC coil on RF block M971 Adjust for 1.30.2V (5
10、22kHz) 1.350.2V (531kHz) Maximum Maximum 230V model and worldwide models Reference Specification FM tuned voltage: 87.5MHz108.00MHz More than 1.2vLess than 10v AM tuned voltage: 530KHz1710KHz 1.30.2Less than 9.0v Reference Specification FM tuned voltage: 87.5MHz108.00MHz More than 1.2vLess than 10v
11、AM tuned voltage: 522KHz1611KHz 1.30.2Less than 9.0v (230V model) AM tuned voltage: 531KHz1602KHz 1.30.2Less than 9.0v (Worldwide model) RadioFans.CN 3 ADJUSTMENTGTP-502 3. FM MEASUREMENT Fig. 1 Fig. 2 4. RDS MEASUREMENT Fig. 3 5. AM MEASUREMENT Fig. 4 6. ADJUSTMENT POINTS FM SINGAL GENERATOR ANTENN
12、A TERMINAL ANTENNA TERMINAL DISTORTION ANALYZER DISTORTION ANALYZER AC VOLTMETER OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINAL OUTPUT TERMINAL L R ANTENNA TERMINAL ANTENNA TERMINAL ANTENNA TERMINAL AM LOOP ANTENNA (Accessory) AM LOOP ANTENNA 60cm DIGITAL MILL
13、IVOLT METER VT FM SIGNAL GENERATOR AM SIGNAL GENERATOR FM SIGNAL GENERATOR RDS GENERATOR OSCILLO- SCOPE TP701 FM STEREO GENERATOR TP-141 DC MILLIVOLT METER UNIT UNIT UNIT UNIT R951 FM SIGNAL STRENGTH FRONT END IFT M901 L942 FM IF L941 L972 AM IF L903 L904 R956 STEREO SEPARATION P901 R941 MUTING L971
14、 OSCRF RadioFans.CN IR ASSEMBLY 1200IR ASSEMBLYPCB-A0180C-IR PCB BOARD 1201PCB KEYBOARD/RM1/TUNER/MISC1724-670A-0002 METAL MATERIAL 1202ME 2*8 4.0MM BK/RH JHC023-002954-2008-3000 WAFER J501A5P ST.WAFER P=2.5 COULOMB2102-051S-004 JACKS/SOCKET M501DIN 5P 180DEG SOCKET2113-1682-0 ROOM 1 ASSEMBLY 2200RO
15、OM 1 ASSEMBLYPCB-A0180C-RM1 PCB BOARD 2201PCB KEYBOARD/RM1/TUNER/MISC1724-670A-0002 CAPACITORS C201,C202CC 16V 0.22 20% CM 0805 1.2X2.0150D-224M-J-BD C213,C214CC 50V 100pF 5% 0805 1.2X2.0150F-101J-J-BD C215,C216CE 50V 10F 20% RL 4x7157F-106M-5-GM c217,c218CC 16V 0.47 10% 0805/2012 1.5X2.5150D-474K-J
16、-BDL C219,c220CC 50V 100pF 5% 0805 1.2X2.0150F-101J-J-BD C221,C222CC 50V 22pF 5% 0805 1.2x2.0150F-220J-J-BD C223-C226CE 50V 10F 20% RL 4x7157F-106M-5-GM C227,C228CE 25V 4.7F 20% RL 4x7157E-475M-5-GM C229,C230CM 50V 4700pF 10% RL 5x5153F-472K-5-II C231-C234CM 50V 0.056F 5% RL7.5X9.5153F-563J-5-NR C23
17、6,C236CM 50V 4700pF 10% RL 5x5153F-472K-5-II C237,C238CP 50V 47pF 5% RL 5.5x10158F-470J-5-JS C241,C242CE 50V 10F 20% RL 4x7157F-106M-5-GM C323,C324CC 16V 0.22 20% CM 0805 1.2X2.0150D-224M-J-BD DIODES D211,D309RLS-73 DIODE4840-1080-3 WAFERS/SOCKETS J131BWAFER 8P P2.5 ST.2102-081S-004 J132A6P ST. WAFE
18、R P=2.5 COULOMB2102-061S-004 J210A,J224A4P ST.WAFER P=2.5 COULOMB2102-041S-004 J320ASOCKET (PCB/PCB) 16P P2.0 RA2101-1601-0 J321ASOCKET (PCB/PCB) 4P P2.0 RA2101-1671-0 J322A,J323A4P ST.WAFER P=2.5 COULOMB2102-041S-004 RELAYS M225,M226RELAY V23105-A5303-A201 SIEMENS4500-0920-0 TRANSISTORS Q209TR KTC3
19、875Y4853-875Y-3 Q210TR KTA1504Y4851-504Y-3 Q214,Q215TR 2SC2878 (A,B) RL4860-0770-5 Q218,Q219TR 2SD1012F/G HFE 160-5604851-012F-5 Q310TR FET J1124860-8770-0 Q313,Q314TR 2SC2878 (A,B) RL4860-0770-5 RESISTORS R235,R236RMG 1/10W 1K 1% 08054720-102A-J R237,R238RMG 1/10W 56K 1% 08054720-563A-J R239RMG 1/1
20、0W 10K 1% 08054720-103A-J R240RMG 1/10W 7.5K 1% 08054720-752A-J R241,R242RMG 1/10W 15K 5% 08054720-153J-J R243,R244RMG 1/10W 2.2K 1% 08054720-222A-J R245,R246RMG 1/10W 0R 5% 08054720-000J-J R247,R248RMG 1/10W 1M 1% 08054720-105A-J R249,R250RMG 1/10W 3.9K 1% 08054720-392A-J 4 PARTS LISTGTP-502 REF NO
21、.DESCRIPTIONPART NO. RadioFans.CN 5 PARTS LISTGTP-502 R251,R252RMG 1/10W 4.7K 5% 08054720-472J-J R253-R256RMG 1/10W 7.5K 1% 08054720-752A-J R257,R258RMG 1/10W 1K 1% 08054720-102A-J R259RMG 1/10W 220K 5% 08054720-224J-J R260RMG 1/10W 680K 5% 08054720-684J-J R261-R264RMG 1/10W 6.8K 1% 08054720-682A-J
22、R265-R268RMG 1/10W 1K 1% 08054720-102A-J R269,R270RMG 1/10W 6.8K 1% 08054720-682A-J R271,R272RMG 1/10W 100R 1% 08054720-101A-J R273,R274RMG 1/10W 220K 1% 08054720-224A-J R275,R276RMG 1/10W 10K 5% 08054720-103J-J R277-R279RMG 1/10W 0R 5% 08054720-000J-J R280RMG 1/10W 220K 5% 08054720-224J-J R281,R282
23、RMG 1/10W 10K 5% 08054720-103J-J R283RMG 1/10W 680K 5% 08054720-684J-J R284,R285RMG 1/10W 220K 5% 08054720-224J-J R286,R287RMG 1/10W 0R 5% 08054720-000J-J R295,R296RMG 1/10W 1.2K 5% 08054720-122J-J R297RMG 1/10W 10K 5% 08054720-103J-J R298,R299,R322RMG 1/10W 100K 5% 08054720-104J-J R323RMG 1/10W 10M
24、 5% 08054720-106J-J R365RMG 1/10W 10K 5% 08054720-103J-J R366,R367RMG 1/10W 100R 1% 08054720-101A-J R368RMG 1/10W 10K 5% 08054720-103J-J R451,R452RMG 1/10W 2.2K 5% 08054720-222J-J R455RCF 1/4W 150R 5% AT4705-151J-2 R801-R816RMG 1/10W 1.2K 1% 08054720-122A-J R817-R832RMG 1/10W 3.3K 1% 08054720-332A-J
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