Daughter Unit (X89-2690-10) - Kenwood KDC-3028 Service Manual

KDC-3028/328
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3 7 63 1515 0
Ref. No. Application / Function
IC4 L.P.F. (LOW PASS FILTER)
Q1 APC (AUTOMATIC POWER CONTROL)
Q2 DIGITAL +5V SW
Q3 Q4 SW
Q4 ANALOG +8V SW
Q5, 6 CURRENT AMP
SWITCH UNIT (X16-2910-11)
Ref. No. Application / Function
IC1 VFD DRIVER
IC2 REMOTE CONTROL
Q4 SW 5V
Q10 RED LED SW

DAUGHTER UNIT (X89-2690-10)

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Ref. No. Application / Function
L 13942296513
Q221, 222 2-PREOUT MUTE
Q225 2-PREOUT MUTE
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COMPONENTS DESCRIPTION
2nd low pass filter for audio signals.
LD power control.
"ON" When P. ON signal goes "L".
"ON" When P. ON signal goes "L" (SW+5V is ON).
"ON" When P. ON signal goes "L" (Q3 is ON).
Current driver.
The power supply of IC2 turns on when Q4's base goes "L".
RED LED turns on when Q10's base goes "H".
"ON" when the base goes "H".
"ON" when the base goes "H".
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Operation / Condition
Operation / Condition
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Operation / Condition
3 6 7 1 3 1 5
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