Pioneer RX-P840 Service Manual page 51

Stereo cassette deck receiver
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FRONT ASSY FOR 100W (AWZ5389)
Q7503, Q7505, Q7507, C
Q7501 : BIAS TEMPERATURE COMPENSATION
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167702 (1/2) : TEMPERATURE DETECTION (LOW SPEED)
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167701 (2/2) :
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17701 (1/2) : TEMPERATURE DETECTION (HIGH SPEED)
1C7702 (2/2) : TEMPERATURE DETECTION (OVER HEAT)
WR7701
R770
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FRONT ASSY FOR 100W
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