Kenwood KDC-MP819 Service Manual page 4

KDC-MP819/X659/Z838
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Ref.No. Component Name
Q18 2SA1576A
Q19 2SC4081
Q20 2SA1576A
Q21 2SC4081
Q22 2SC4081
Q23 2SA1576A
Q26 2SB1277(Q,R)
Q29 DTC114YUA or UN5214
Q27 2SA1576A
Q28 DTA124EUA or UN5112 P-CON. protection inhibit SW Prevents Q27 tuning ON during start-up after power ON.
Q30 2SC4081
Q31 2SC4081
Q32 DTA124EUA or UN5112 Mute driver for R Ch.
Q33 DTA124EUA or UN5112 Mute driver for L Ch.
Q34 2SC4081
Q35 DTC124EUA or UN5212 E. VOL. mute SW
Q36 DTC143TUA or UN5216 Noise buffer
Q37 DTC143TUA or UN5216 Audio mute SW (Front L) When Q37's base goes Hi, Pre-output is muting.
Q38 DTC143TUA or UN5216 Audio mute SW (Front R) When Q38's base goes Hi, Pre-output is muting.
Q39 DTC143TUA or UN5216 Audio mute SW (Non Fader R) When Q39's base goes Hi, Pre-output is muting.
Q40 DTC143TUA or UN5216 Audio mute SW (Non Fader L) When Q40's base goes Hi, Pre-output is muting.
Q41 DTC143TUA or UN5216 Audio mute SW (Rear L) When Q41's base goes Hi, Pre-output is muting.
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Q42 DTC143TUA or UN5216 Audio mute SW (Rear R) When Q42's base goes Hi, Pre-output is muting.
Q43 DTC124EUA or UN5212
Q44 CPH3105
Q45 DTC124EUA or UN5212
Q46 CPH3105
Q101 DTA114YUA or UN5114 DSI LED SW
Q103 DTC124EUA or UN5212 AUX/CD selector SW
Q111 2SB1277(Q,R)
Q112 DTC114YUA or UN5214
Q305 DTA114YUA or UN5114 EJECT LED SW
Q306 DTA114YUA or UN5114 EJECT LED SW
Q472 DTC144EUA or UN5213 MECHA. AVR SW
Q473 2SC4081
Q474 2SB1548(P)
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COMPONENT DESCRIPTION
Application/Function
PRE-AMP -9V AVR
PRE-AMP +9V AVR
P-CON SW
P-CON. protection SW Protect Q26 by turning ON when P-CON output is grounded.
BU detection SW
ACC detection SW
AGC for spectrum analyser
FM+B SW
AM+B SW
P-ANT SW
BU 5V AVR
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Operation/Condition/Compatibility
Q18 and Q20 work as a differential amplifier, Q19 works as a driver,
and -9.3V is supplied to OP AMP.
Q21and Q22 work as a differential amplifier, Q23 works as a driver,
and +9.7V is supplied to OP AMP.
When Q29's base goes Hi, Q26 is turned on, and P-CON signal is outputted.
Works during POWER ON mode.
While BACKUP is applied, a base goes Hi, and Q30 is turned on.
When momentary power down has detected, a base goes Lo, and
Q30 is turned off.
While ACC is applied, a base goes Hi, and Q31 is turned on.
When BU detection SW or System RESET or MI-COM.'s MUTE is
working, a base goes Lo, and Q32 and Q33 are turned on.
When BU detection SW or MI-COM.'s mute is working, a base goes
Hi, and Q35 is turned on.
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When Q43's base goes Hi, Q44 is turned on, and A.+8V is supplied to
the F/E. Works during FM reception mode or RDS reception mode.
When Q45's base goes Hi, Q46 is turned on, and A.+8V is supplied to
the F/E. Works during AM reception mode.
When a base goes Lo, Q101 is turned on, and DSI illumination LED is lit.
When a base goes Hi, AUX inputs are selected.
When a base goes Lo, CD inputs are selected.
When Q112's base goes Hi, Q111 is turned on, and P-ANT signal is outputted.
Works during FM/AM reception mode or RDS reception mode.
When a base goes Lo, Q305 is turned on, and EJECT illumination
LED is lit.
When a base goes Lo, Q306 is turned on, and EJECT illumination
LED is lit.
When a base goes Hi, Q472 is turned on, and MECHA. AVR operation stops.
While BACKUP is applied, AVR outputs +5V.
Q473 and Q474 are inverted Darlington connection.
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