McIntosh C24 Preamp Service Information 电路图.pdf

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1、HIHntosh c 24 SERVICE INFORMATION STARTING WITH SERIAL NO. 10D01 McIntosh laboratory inc. 2 chambers street Binghamton, new york C 24 RadioFans.CN 收音机爱 好者资料库 ELECTRICAL SPECIFICATIONS FREQUENCY RESPONSE +0 to -O.dB from 20Hz to 20,000Hz DISTORTION Less than 0.1$ at 2.5 volts, 20Hz to 20,000Hz INPUT

2、SENSITIVITY (phono 1, phono 2, tape head) 2 millivolts for 2.5 volts output at 1kHz INPUT SENSITIVITY (aux, tape, tuner) 0.20 volts for 2.5 volts output HUM AND NOISE (phono 1, phono 2, tape head) 70dB below 10 millivolt input HUM AND NOISE (aux, tape, tuner) 75dB below rated output OUTPUT (main) 2.

3、5 volts with rated input. Up to 10 volts can be developed without distortion. OUTPUT (tape) 0.20 volts with rated input. Phono input signal of 10 millivolts produces 1.2 volts output. OUTPUT (center channel) 2.5 volts with rated input on both channels. A level control adjusts output from -6dB to +6d

4、B with respect to main output. BASS CONTROL +l8dB at 20Hz TREBLE CONTROL +l8dB at 20,000Hz LF FILTER Flat or roll off below 50Hz HF FILTER Flat or roll off above 5000Hz RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 PRINTED CIRCUIT RED/WHT RIGHT CHANNEL INPUTS-, I-LEFT CHANNEL INPUTS 10 V NOT E 3 ?

5、 R3 X R 27 15 K AUX TAPE TUNER PHONO I PHONO 2 TAPE HD AUX TAPE TUNER PHONO I PHONO 2 TAPE HD c R15 .65V/ H(Vwvl( .22 i IK R 25 IOOpF/l2V ,.4v a / mV /NOTE 1 it X 5 NOTE 6 7 - NOTE 1 S _1 5 2-2 FRONT ( PARTIAL) 1_A / S 2 - 2 REAR / (PARTIAL) / vS2-3FRONT Jl NOTE 6 .22 IK 0 2 C 50 .05 vj 39pF T R II

6、2 / L-f AA/V ! 4.7 K 5 S 5 /note 7 - i IS- NOTE 6 K S / 6 7 8 5 -7T“ii R 28 R 32 wvvwv 330 K 15 K (OOjjf/liV - -*V V ps s? S 2 - 2 FRONT (PARTIAL) / S2 - I FRONT I / 52-2 REAR (PARTIAL) rj-1-U_ + l . 1- -.AAA,- I a ?T* 117 V -PN- -60 Hz _ ) WATTS - PRINTED CIRCUIT BOARD 043 - 978 SCHEMATIC NOTES 1.

7、Glj.7, CJ4.85 Clj.9, values greater than 1 are in picofarads (pP). The terminal numbering of rotary switches and printed circuit board wires is for reference only. All voltages are measured under the following conditions: 1. Use of an 11 megohm input impedance VTVM 2. All voltages +10% with respect

8、to ground 3. AC input at 117 volts, 50/60 cycles 4 No signal at input terminals $. Front panel controls at normal positions REPLACEMENT PARTS 11 parts not listed are common items obtain- ble from radio parts jobbers. eplacement parts may be obtained when ordered y PART NUMBER from: McIntosh Laborato

9、ry Inc. Customer Service Department 2 Chambers Street Binghamton, New York 13903 (telephone 607-723-3512) CAPACITORS Symbol lumber Description Part Number SI,2 Mylar . 22pF 20$ 250V 064-043 S3,4 Mylar . lp-F 20$ 250V 064-037 S7,8 Mylar . 22p.F 20$ 25 OV 064-043 S17.18 Mylar 47P-F 20$ 25 OV 064-045 :

10、i9,20 Mylar .22 20$ 250V 064-043 23,24 Mylar 47P-F 10$ 100V 064-019 S31.32 Mylar . 22pF 20$ 25 OV 064-043 (33,34 Mylar .22 20$ 250V 064-043 S35,36 Elect . lOpJ 100V 066-007 37,38 Mylar 47 10$ 100V 064-019 S39,40 Elect . lOOpJF i5v 066-127 :4l Mylar . 22pF 20$ 25 OV 064-043 :42 Mylar 47P-F 10$ 100V 0

11、64-019 46 ifylar 100pF 15 v 066-127 !5l,52 Mylar .22pF 20$ 25 OV 064-043 DIODES 1,2 Si. rectifier 070-015 3 Zener diode 75V 070-025 4 Zener diode 10V 070-024 FUSES 1 Fuse 1/2 amp 089-009 2 Fuse 1/16 amp (pig-tail) 089-010 2 Fuse 1/16 amp (cartridge) 089-012 POTENTIOMETERS Si,2 Balance & loud control

12、 (with flat shaft) 134-178 1,2 Balance & loud (with knurled control shaft) 134-101 3 Volume control 134-074 4 Bass (with control flat shaft) 134-180 R4 Bass control (with knurled shaft) 134-080 R5 Treble control (with flat shaft) 134-181 R5 Treble control (with knurled shaft) 134-081 R6 L & R volume

13、 control 134-082 RESISTORS R75.76 Wirewound 16S2 10$ 20W 139-022 R77,78 Wirewound 100S2 10$ 5w 139-008 R102,103 Wirewound 27 10$ 1W 139-028 SWITCHES SI Compensation switch 148-007 S2 Input selector switch 146-067 S3 Tape monitor 148-007 34 Mode selector switch 146-107 S5 Power switch 148-003 S6 LF s

14、witch 148-007 S7 HF switch 148-007 S8 Speaker switch 148-007 S9 Phase switch 148-007 TRANSISTORS Ql,2 Si. NPN transistor 132-503 Q3,4 Si. NPN transistor 132-503 05,6 Si, NPN transistor 132-026 07,8 Si. NPN transistor 132-504 09,10 Si. NPN transistor 132-501 011,12 Si. NPN transistor 132-026 013,14 S

15、i. NPN transistor 132-501 015,16 Si. NPN transistor 132-026 Q17 Si. NPN transistor 132-502 Ql8 Si. NPN transistor 132-014 TRANSFORMER Tl Power transformer 043-532 MODULES Tone control 130-007 Equalization 130-026 LAMPS Neon bulb 058-009 FRONT PANEL AND TRIM Front Panel (complete) Front panel glass 0

16、43-360 043-877 End cap (right) 018-043 End cap (left) 018-044 Volume control knob 043-253 Input selector knob 043-253 Mode selector knob 043-253 Balance knob 090-009 Loudness control knob (for flat shaft) 043-625 Loudness control knob (for knurled shaft) 090-008 Bass knob, front (for flat shaft) 043

17、-625 Bass knob, front (for knurled shaft) 090-008 Bass knob, rear 090-009 Treble knob, front (for flat shaft) 043-625 Treble knob, front (for knurled shaft) 090-008 Treble knob, rear 090-009 L & R gain control knobs 090-013 MOUNTING SYSTEM Shelf bracket (right) 043-592 Shelf bracket (left) 043-593 M

18、ounting template #100 038-179 Hardware package 043-452 MISCELLANEOUS ITEMS Line cord 170-021 Puseholder 178-001 Shipping carton 043-950 Owners manual 038-035 Plastic feet 017-041 Shorting plug 127-001 Audio cable (6! ) 170-015 12C10226S-M8294 MODEL NUMBER: C 24 MODIFICATION: Add four grounding sprin

19、gs to the shafts of the Volume, Balance, Bass and Treble controls. DESCRIPTION: Some controls have developed a noise when rotated. Adding the springs to ground the shafts prevents this condition. CAUTION: When adding the springs to the Bass and Treble control, be sure they make good contact. Make sure the spring is not too tight. If the springs are tight the clutch action of the controls will not function. PROCEDURE: Remove the front panel. Place the spring around the shaft and insert the ends of the spring into the control guide hole. See diagram.