Component Description - Kenwood KRC-19A/G Service Manual

QQ
3 7 63 1515 0
SWITCH UNIT(X13-965X-XX)
Ref.No. Component Name
IC1 LC75853E
Q DTA114EK or UN2111
SYNTHESIZER UNIT(X14-6570-2X)
Ref.No. Component Name
IC1 LC72366-9592
IC2 TDA7461ND
IC3 HD74HC27FP
IC4 TDA7384A
IC5
Q50 2SC2412K or 2SD601A
Q51 2SB1443
Q52 2SC2412K or 2SD601A
Q53 DTA114YK
Q54 DTC144EK or UN2213
Q55 DTA124EK or UN2112
2SB1548(P) or 2SB1565(E,F)
Q56
or 2SB1655(E,F)
Q57 2SC2412K or 2SD601A
Q58 DTC144EK or UN2213
Q59 DTA124EK or UN2112
TE
L 13942296513
2SB1548(P) or 2SB1565(E,F)
Q60
or 2SB1655(E,F)
Q61 2SC2412K or 2SD601A
Q150 DTC124EK or UN2212
Q151 DTC114YK or UN2214
Q153 DTA124EK or UN2112
Q200 DTC124EK or UN2212
Q201 2SB1277(Q,R)
Q202 DTC124EK or UN2212
Q203 2SB1277(Q,R)
Q260 DTC114YK or UN2214
Q261 2SB1443
Q301 DTA144EK or UN2213
Q320 2SA1037K
Q350 2SB1277(Q,R)
Q351 2SA1037K
Q352 DTA124EK or UN2112
www
Q353 DTC114YK or UN2214
Q370 2SB1277(Q,R)
.
Q371 DTC114YK or UN2214
Q450 DTC143TK or UN2216
Q451 DTC143TK or UN2216

COMPONENT DESCRIPTION

Application/Function
LCD driver with key-matrix
Key-matrix permission SW
Application/Function
System MI-COM.
E-VOL. & N.C. MPX
Mute logic
Power IC
LA3161 Equalizer amplifier
BACK-UP detection (Momentary While BACK-UP is added, a base becomes Hi,
power down detection) SW
BACK-UP 5V AVR
P.ON 5V SW
COM+B SW
COM+B AVR
ILLUMINATION +B SW
ILLUMINATION +B DRIVER
ELECTRIC VOLUME MUTE SW RESET SW or MI-COM.'s mute works, a base
SVR DISCHARGE SW
PRE OUT MUTE DRIVER
FM +B SW
FM +B DRIVER
AM +B SW
AM +B DRIVER
MOTOR +B SW
MOTOR +B DRIVER
CHANGER RESET SW
PANEL 5V SW
P-CON. DRIVER
P-CON. PROTECTION SW
P-CON. PROTECTION
INHIBIT SW
P-CON. SW
x ao
y
ANT-CON. DRIVER
i
ANT-CON. SW
PRE OUT MUTE SW(R ch.)
PRE OUT MUTE SW(L ch.)
KRC-19A/G,289
8
Ready on key-matrix
System control
Controls sound volume. Selects each source.
3-input NOR gate x 3
Amplifies power so that the speaker
can drive audio signal.
Equalizer amplifier for cassette tape sound
and Q50 is turned on.
While BACK-UP is added, AVR outputs +5V.
Inverted Darlington connection.
While a base becomes Lo, Q53 is turned on.
Q55 is turned on while Q54's base becomes Hi.
Works during POWER ON mode.
Q56 is turned on while Q57's base becomes Hi.
Inverted Darlington connection.
Q59 is turned on while Q58's base becomes Hi.
Works during POWER ON mode with a panel
attached to the set.
Q Q
3 6 7 1 3
Q60 is turned on while Q61's base becomes Hi.
Inverted Darlington connection.
When BACK-UP detection SW or CHANGER
becomes Hi, and Q150 is turned on.
When POWER IC RESET is activated, a base
becomes Hi, Q151 is turned on.
When BACK-UP detection SW or CHANGER
RESET SW or MI-COM.'s mute works, a base
becomes Lo, and Q153 is turned on.
Q201 is turned on when Q200's base becomes Hi.
Works during FM reception mode.
Q203 is turned on when Q202's base becomes Hi.
Works during AM reception mode.
Q261 is turned on when Q260's base becomes Hi.
Works during TAPE mode.
When a base becomes Lo, Q301 is turned on.
While a panel is attached to the set,
a base becomes Lo, and Q320 is turned on.
Q350 is turned on when Q353's base becomes Hi.
Works when P-CON is being
short-circuited on GND.
Inhibits protection SW function when P-CON
works momentary.
Q353 is turned on when a base becomes Hi.
Works during POWER ON mode.
u163
Q370 is turned on when Q371's base becomes Hi.
.
Works during TUNER mode.
When BACK-UP detection SW or CHANGER
RESET SW or MI-COM.'s mute works,
a base becomes Hi, and Q450,451 are turned on.
2 9 9 4 2 8
Operation/Condition/Compatibility
Operation/Condition/Compatibility
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9
3