File name hfe_pioneer_ma-62_service.pdf
SERVICE MANUAL
MIXING AMPLIFIER
MFEiE KL
()ProNEeR.
MA-CiE!
CONTENTS
I.SPEC|F|CAT|ONS ...2
2. CONNECTION DIAGRAM .. ... 3
3. NAMES OF CONNECTORS ON THE BACK PANEL ..., 4
4.FRONTPANELFACILITIES ...5
5. BLOCK DIAGRAM ... 7
6.C|RCU|TDESCRTPTTON... ...9
7. LEVEL DIAGRAM .. .. . . . .11
S.DISASSEMBLY.. ...12
9. PARTS AND P.C. BOARD LOCATION . . .. .14
10. EXPLODED VIEW AND PARTS LIST . . . . .16
11. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTT
11.1 Circuit Connection Diagram and Miscellaneous Parts . . .19
11.2 Switch Circuit-B Assembly . . . .22
11.3 MicrophoneAmplifierAssembly ...23
11.4 SwitchCircuit-AAssembly ...33
12. PACKING METHOD AND PART NUMBERS ...36
,1. SPECIFICATIONS
SEMICONDUCTORS
lCs... ...2
Transistors ...22
Diodes ...3
lnput Select:
CH1, CH2: MIC i PHONO
CH3, CH4, CH5, CH6: MIC / LINE
Output Channel Select:
CH1,CH2, CH5,CH6: L/ L& R / R
CH3, CH4 (PAN-POT): L - R (Panoramic Potentiometer)
I nput (Sensitivity/l mpedance) :
MIC: 0.25mV l4.lkS]"
PHONO: 2.5mV / 50kS)
LINE: 50mV i 50kfi
MIC Attenuator: 0dB, -20d8
MIC Overload Level: 250mV rms (at attenuator -20d8)
PHONO Overload Level: 250mV rms (at ikHz)
Output: Stereox 2 (parallel)
Rated Output Level: 330mV
Harmonic Distortion Less than 0.2o/o (at 1V output)
Maximum Output: 5V (T.H.D.= 0.5%,50k0 load)
Channel Separation: More than 70dB (at l kHz)
Cross-talk: More than 70dB (at l kHz)
Frequency Response:
Mlc: 2}Hzto 15kHz (19d8)
PHONO: R IAA Equalization: t0.5dB
LINE: 2OHzto2SkHz(1?Oe)
MI |