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MA 5100
PREAMP - AMPLIFIER
SERVICE INFORMATION
S T A R T I N G WITH S E R I A L NO. 21HOO
MA 5100
MclNTOSH
LABORATORY
INC.
2
CHAMBERS STREET
BINGHAMTON,
NEW Y O R K
MA
5100
ELECTRICAL SPECIFICATIONS
Power Output: 90 watts RMS continuous, 45 watts per channel operating simultaneously into 4 ohm or 8 ohm loads. 60 watts RMS continuous, 30 watts per channel operating simultaneously into 16 ohm loads. Harmonic Distortion: Less than 0.25% at rated power output from 20Hz to 20,000Hz with both channels operating. Intermodulation Distortion: Less than 0.25% for any combination of frequencies from 2QHz to 20,000Hz if instantaneous peak power is 90 watts per channel or less into 4 or 8 ohm loads and 60 watts per channel or less into 16 ohm loads with both channels operating. Frequency Range: At rated output both channels: ±0.5dB 20Hz through 20,000Hz. Output Impedance: 4 ohm, 8 ohm, 16 ohm. Internal Impedance/Damping: Less than .04 ohms; damping factor greater than 100. Input Sensitivity And Impedance: Auxiliary, Tape, Tuner, and Tape Monitor: 300mV, 250K ohms. Phono 1 and Phono 2: 2mV, 47,000 ohms. Tape Head: 2mV, 1/2 megohm. Hum And Noise: High Level Inputs: 75dB below rated output. Low Level Inputs: 70dB below 10mV input. Power Amplifier: 90dB below rated output. Tape Output: 300mV at rated sensitivity, 1.4 volts with 10mV at phono input. Left Plus Right Output: Adjustable 0 to 6 volts from generator impedance of less than 5,000 ohms. Bass Controls: +18dB at 20Hz. Treble Controls: +l8dB at 20,000Hz. HF Filter: Flat, or 5,000Hz cutoff. LP Filter: Plat, or 50Hz cutoff. Power Requirements; 117 volts AC, 50-60Hz, 70 watts at zero signal output, 200 watts at rated output. No impedance switching required.
MA 5100
MA 5100 B L O C K DIAGRAM
MA 5 1 0 0
PREAMP. SECTION P R I N T E D C I R C U I T B O A R D
043-989
H E A V Y LINE SHOWS
P R I M A R Y S I G N A L PATH
PREAMP. SECTION
MA 5100 154-411
H E A V Y LINE S H O W S P R I M A R Y SIGNAL PATH
POWER OUTPUT SECTION
MA 5100 154-376
MA 5 1 0 0
OUTPUT MONITOR PRINTED CIRCUIT BOARD 0 4 3 - 8 2 1
( NOTE 1 )
LEFT CHANNEL POWER OUTPUT SECTION PRINTED CIRCUIT BOARD
043-919
RIGHT CHANNEL POWER OUTPUT SECTION P R I N T E D CIRCUIT BOARD 043-919
MA 5100
FILTER SECTION PRINTED CIRCUIT BOARD
043-990
FILTER SECTION PRINTED CIRCUIT BOARD
043-990
FILTER SECTION
MA5100 154-410
SCHEMATIC NOTES
Unless otherwise specified: Resistance values are in ohms, 1/2 watt, and 10% tolerance; capacitance values smaller than 1 are in microfarads ( m f d ) ; capacitance values greater than 1 are in picofarads (pF) ; inductors are in microhenries (µH). Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers on the dotted lines correspond to the numbers of the PC board layouts. The heavy lines on the schematics denote the primary signal path. The terminal numbering of rotary switches is for reference only. All voltages indicated on the schematics are measured under the following conditions : a. b. c. d. e. Use of an 11 megohm input impedance VTVM, All voltages ±10% with respect to chassis ground. No signal at input terminals, AC input at 117 volts AC, 50/60Hz. Front panel controls at: Input Selector Mode Selector
AUX STEREO
MA5 1 0 0
Volume Power
MAX ON
All other controls in normal position. 1. 2. In units with serial numbers below 46H01, the output monitor PC board is not used. In units with serial numbers below 44H50: R256 & R25? are not used; R254 & R255 are 120 ohms; transistors Q205 & Q206 (132-021) and pots R221 & R222 (134-120) are used; the emitter of Q2l5 & Q216 is connected as shown by the dotted line; C221 & C222 are used. In early units, C5 & C6 were 39pF. In units with serial numbers below 30H15: L201, L202, R241, R242, C215, C216, C217, and C2l8 are not used; C227, C228, C229, C230, C231, and C232 are used; R229 & R230 are 100 ohms; C201 & C202 are 330pF. In early units, C207 & C208 were 200µF, 3V (part number 066-086). In units with serial numbers below 30H30: (part number 070-022). D201 & D202 were two diodes
3. 4.
5. 6. 7. 8. 9. 10. 11. 12.
In units with serial numbers below 28H00: C3, C4} C5, C6, R9, R10, and R314 are not used. In early units, C308 & C309 were 10,000µF, 40V (part number 066-090). In units with serial numbers below 24H05: R237 & R238 are .47 ohms; R233 & R234 are 220 ohms; C211, C212, C213, and C2114 are . 1 F 0 µ . In units with serial numbers below 23H7S: not used. D211, D212, D213, and D214 are
In units with serial numbers below 22H00: R227 & R228 were 1K, 1 % 1W, 0 , In units with serial N o ' s below 54H60: R254 and R255 are 18 F202, F203j and F204 are 3A fuses. (Part Ho. 089019) and F201,
LOCATION OF T R A N S I S T O R S NOT ON PRINTED CIRCUIT BOARDS
MA 5100
POWER SUPPLY SECTION
MA 5100 154-331
MA
5100
REPLACEMENT PARTS
A l l p a r t s not l i s t e d a r e common items o b t a i n a b l e from r a d i o p a r t s j o b b e r s . Replacement p a r t s may be obtained when ordered by PART NUMBER from: M c l n t o s h Laboratory, Inc. C u s t o m e r S e r v i c e Department 2 Chambers S t r e e t B i n g h a m t o n , New Y o r k 13903 (telephone 6 0 7 - 7 2 3 - 3 5 1 2 ) CAPACITORS Symbol Number Description Mylar Mylar Elect. Mylar Mylar Mylar Mylar Elect. Mylar Mylar Mylar Mylar Mylar Ta. E l e c t . Ta. E l e c t . Elect. Elect. Mylar Mylar Elect. Elect. Elect. Elect. Elect. Elect. Elect. .22µF .1µF 100µF .1µF .1µF .47µF .47µF 100µF .47µF .22µF .1 .01µF .22µF 1µF 1.5µF 100µF 180µF .047µF .047µF 10µF µF 250V 250V 12V 250V 250V 75V 250V 12V 250V 200V 250V 250V 250V 35V 35V 12V 3V 250V 250V 25V Part Number 064-043 064-037 066-127 064-037 064-037 064-039 064-045 066-127 064-045 064-087 064-038 064-040 064-043 066-091 066-092 066-127 066-111 064-044 064-044 066-005
D301
Si. Si. Si. Si. Si. Si. Si. Si.
rectifier rectifier rectifier rectifier rectifier rectifier rectifier rectifier
070-031
D302 D303 D304 D305 D306 D307 D308 D309
070-031
070-031 070-031 070-041 070-041 070-041 070-041 070-030
Si. rectifier FUSES
C1 ,2
C7,8
F201 , 2 0 2
Fuse Fuse
4A ( S F E - 4 ) 4A ( S F E - 4 )
089-021 089-021 089-015
C9 ,10 C11 , 12
C 1 3 ,1 4 C15, 16 C 1 7 , 18
F203,204
F301
Fuse 2 . 5 A S l o - B l o CHOKES
L201 , 2 0 2
Choke
2µH TRANSISTORS
122-064
C19,20
C21 ,22
Q1,2 Q3,4 Q5,6 Q7,8 Q9, 10
Si. Si. Si. Si. Si. Si. Si. Si. Si. Si. Si. Si.
NPN NPN NPN NPN NPN NPN NPN PNP PNP PNP NPN PNP
transistor transistor transistor transistor transistor transistor transistor transistor transistor transistor transistor transistor
132-041 132-041 132-051 132-041 132-057 132-051 132-057 132-029 132-029 132-029 132-021 132-032 132-515 132-022 132-521 132-527 132-533 132-533
C23,24
C101 , 102
C 1 0 3 , 104 C 1 0 7 ,108
C11 1
Q11,12
Q101 , 102
C1 12, 113
C203,204 C207,208
C21 1 , 2 1 2
Q 1 0 3 , 104
Q201 , 2 0 2
Q203,204 Q207,208 Q209,210
Q211 ,212 Q211 ,212
C213,214 C223,224 C304 C305 C306 C307 C308 C309
S i . NPN t r a n s i s t o r ( f o r u n i t s above 2 2 H 6 0 ) S i . NPN t r a n s i s t o r ( f o r u n i t s below 2 2 H 6 0 )
Si. Si. Si. NPN PNP NPN
80/80/150/50µF 066-103 200/200/150/150V 200/500µF 100/50V 200/500µF -100/-75V 100µF 9300µF 9300µF DIODES 12V 45V 45V 066-099 066-093 066-127 066-106 066-106
Q213,214 Q215,216 Q217,218 Q219,220
transistor transistor transistor
S i . NPN t r a n s i s t o r POTENTIOMETERS
R53 R58
Balance
control
134-035 134-033
Volume Control B a s s control Bass control shaft) (w/flat shaft) (w/knurled (w/flat
D201 ,202
S i . reference d i o d e
Si. Si.
rectifier rectifier
070-040 070-030 070-030 070-022 070-022 070-031 070-031
R63 R63 R64 R64
134-172 134-162 134-173 134-163 134-063
D203,204 D205,206 D207,208 D209,210
D21 1 , 2 1 2
Si. Si.
Si.
signal signal
diode diode
T r e b l e control shaft)
rectifier
Treble control (w/knurled shaft) L & R adjust
D213,214
Si. rectifier
R247
MA 5 1 0 0
RESISTORS
R231 ,232
Wirewound Wirewound .33 Wirewound .47 Wirewound 200
3 . 6k ohms ohms ohms ohms ohms ohms ohms ohms ohms Ohms
5W 5W 5W 5W 5W 5W 5W 5W 5W 5W 5W
139-013 139-036 139-050 139-009 139-008 139-009 139-008 139-009 139-010 139-011 139-009
Treble knob (front) - for k n u r l e d shaft
Bass knob (rear)
090-008 090-009 043-625 090-008
R237,238 R239,240 R250,251
Bass knob (front) - for f l a t shaft Bass knob (front) - for k n u r l e d shaft LAMPS Panel illumination #1864 Switch i n d i c a t o r #334
M O U N T I N G SYSTEM
R301
R302,303 R307 R308
Wirewound 100 Wirewound 220 Wirewound 100 Wirewound 220 Wirewound 7.5
058-028 058-003
R311
R312
Wirewound 500 Wirewound 220
S h e l f bracket { r i g h t ) Shelf bracket (left)
M o u n t i n g template #100
043-234 043-235 038-179 043-557
R313
SWITCHES
S1 S2
Input selector s w i t c h
Compensation s w i t c h Tape m o n i t o r s w i t c h
146-035 148-019 148-012 146-105 148-019 148-019 148-019 148-019 148-012 148-005 153-007 153-007
Hardware package M I S C E L L A N E O U S ITEMS P l a s t i c feet S h i p p i n g carton Owners manual L i n e cord
Shorting plug
S3 S4 S5
S101 S102 S103 S201
S301
017-041 043-727 038-129 170-021 127-001 178-001
Mode selector s w i t c h Loudness s w i t c h L F switch HF switch Phase switch Speaker switch Power switch Thermal cut out Thermal cut out TRANSFORMERS
Fuseholder
S302
S303
T301
Power transformer T H Y R I S T O R S & TRIGGERS
043-551
TR201 ,202 SB201 ,202
Triac B i l a t e r a l switch MODULES
Tone Control module
131-001 131-002
130-007 130-026
Compensation module
FRONT PANEL & T R I M
Front panel Front panel end cap {right) Front panel end cap ( l e f t ) Volume control knob Balance control knob
I n p u t control knob
043-725 018-043 018-044 043-253 043-253 043-253 043-253 090-009 043-625 15C1114S6-M9376
·
Mode selector knob T r e b l e knob (rear) T r e b l e knob (front) - for f l a t shaft
MA 5100 SCHEMATIC PART NO. 038-376
BE042004