Pioneer SA 1000 Service Manual
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Extracted text from Pioneer SA 1000 Service Manual (Ocr-read)
Page 1
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STEREO AMPLIFIER
SA-1000/FVW, KUW
NOTE:
MODEL SA-lOOO COMES IN TWO VERSIONS
DISTINGUISHED AS FOLLOWS:
Round label on rear panel Voltage
FVW ' 5-position selector
KUW 120V only
PIONEEI?
Page 2
SA-1 000
CONTENTS
SPECIFICATIONS ................................... 3
BLOCK DIAGRAM .................................. 5
2-1 Low level input circuit ............................... 7
2-2 Head amplifier .................................... 7
2-3 High level inputs and control circuits ..................... 7
2-4 Control amplifier ................................... 7
2-5 Filters .......................................... 7
2-6 Main amplifier ..................................... 7
2-7 Protector circuit ................................... 7
2-8 Power supply ..................................... 8
ANALYSIS OF SOME SELECTED CIRCUITS
3-1 Quasi-complementary push-pull output .................... 9
3-2 D.C.biasapplycircuit........................., ..... 10
3-3 Drive amplifier .................................... 11
3-4 D. C. neutral potential stabilizer ........................ 11
3-5 Signal negative feedback circuit ......................... 11
36 D. C. neutral voltage detector ......................... 11
3-7 Overload detector ................................... 12
DISASSEMBLY
4-1 Removal of the cover ................................ 13
4-2 Removal of the bottom plate .......................... 13
4-3 Removal of the front panel ............................ 13
4-4 Removal of the metal housing .......................... 13
4-5 Removal of the units ................................ 13
PERFORMANCE CHECKS AND ADJUSTMENTS
5-1 D. C. voltage check ................................. 14
52 D. C. neutral voltage & detector circuit adjustment ............ 16
5-3 Idle current adjustment .............................. 16
SCHEMATIC AND PRINTED CIRCUIT BOARDS
6-1 Unit connection diagram .............................. 17
6-2 Head amplifier unit ................... - .............. 19
63 Control amplifier unit ............................... 20
6-4 Filter unit ........................................ 21
65 Main amplifier unit ................................. 22
6-6 Protector unit ..................................... 24
6-7 Power supply unit .................................. 25
PARTS LIST
7-1 Miscellaneous parts ........................ , ......... 26
7-2 Head amplifier unit ................................. 29
7-3 Control amplifier unit ................................ 30
7-4 Filter unit ........................................ 31
7-5 Main amplifier unit .............................. ". . . 32