Kenwood KRC-402 User manual

KAC-202/222/902/382|
“ENWOOP
[402/442
SERVICE
MAN
UAL
©
1995-12
PRINTED
IN
KOREA
B51-6926-00 (K) 1788
The
MECHANISM
OPERATION
DESCRIPTION
is
the
same
as
model
KRC-401/441.
Please
refer
to
the
service
manual
for
model
KRC-401/441
(B51-6791-00).
+4
3Y
3
KRC-402/442
Photo is KRC-402.
Knob
(EJECT)
Cassette
lid
Knob
(REW)
Knob
(FF)
(K24-1681-04) (A53-1617-03)
(K24-1683-04)
(K24-1682-04)
AUTO #AME, DISP PWR 8OFF
yy
CASSETTE RECEIVER KRG-4027
Escutcheon
Liquid
crystal
Panel
ass'y
(BO7-2067-02)
(B38-0640-05)
KRC-402
:
(A64-0629-02)
KRC-442
:
(A64-0630-02)
Mounting hardware ass'y
(J21-7630-13)
Screw set
(N99-1610-15)
Screw
set
(N99-1632-05)
——
ummm
Plastic
cabinet
ass'y
(A02-1443-03)
Lever
(D10-3031-04)
DC cord
KRC-402 : (E30-431 6-05)
Stay
KRC-442
:
(E30-431
7-05)
(J54-0071-04)

KRC-202/222/302/332/402/442
CONTENTS
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BACK
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KRC-202/222/302/332/402/442
KRC-302/332
Knob
(EJECT)
Cassette
lid
©
Knob
(REW)
—
Knob
(FF)
Panel
ass'y
(K24-1681-04) (A53-1617-03) (K24-1683-04) (K24-1682-04) KRC-302 : (A64-0631-02)
Photo is KRC-302 KRC-332 : (A64-0632-02)
AUTO BAME DISP PWR @OFF
COMO-CHANGER CONTROL
Liquid crystal
(B38-0640-05)
M
©
©
SSSTTE
F
Escutcheon
KENWOOD
«:
(B07-2067-02)
Mounting
hardware ass'y
(J21-7630-13)
Plastic
cabinet ass'y
(A02-1443-03)
Lever
DC
cord
(D10-3031-04)
KRC-302 : (E30-4316-05)
KRC-332 : (E30-4317-05)
Screw set
(N99-1632-05)
Screw set
(N9Q9-1610-15)
Stay
(J54-007 1-04) ___—zxe
KRC-20
2
/2
2
2
Knob
(EJECT)
_—
Cassette
lid
Knob
(REW)
Knob
(FF)
Panel
ass'y
(K24-1681-04)
(A53-1617-03)
(K24-1683-04)
(K24-1682-04)
KRC-202
:
(A64-0636-02)
KRC-222
:
(A64-0837-02)
Photo
is
t
AUTO #AME DISP PWR @ OFF
Liquid crystal
(B38-0640-05)
KENWOOD
Escutcheon
(BO7-2067-02)
Plastic
es ———— cabinet assy
(A02-1443-03)
Mounting
hardware ass'y
(J21-7630-13)
Liver
(D1 O-3031-04)
DC cord
KRC-202 : (E30-4316-05)
KRC-222 : (E30-4317-05)
Sireew set
(N9@- 1632-05)
Sireew set
(19 9-1610-15)
Stay
(J54-007 1-04) a0

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KRC-202/222/302/332/402/442
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Advi

SYNTHESIZER UNIT (X14 - 5400 -XX)
KRO-202/222/302/332/402/442
CIRCUIT DESCRIPTION
Use and Function
Operation and Condition
‘| w-COM IC
ELECTRONIC VOLUME
‘| EQ amp/Electronic
VOL/NC MPX/CH !SO/T.ADV/METAL/BASS/TRE
POWER SUPPLY IC
PWR IC
DOLBY IC
CRSC SW
p-COM pin (60).
METAL SW
ON when u-COM (53) goes H.
IC2 MUTE SW
ON when u-COM (17) goes L.
PWR ON SW
ON when p-COM (58) goes L.
+
L.P.F.
| MUTE SW
ON when u-COM (17) goes L.
+
DSI SW
ON when u-COM (26) goes H.
PANEL VDD SW
ON when p-COM (45) goes L.
2-COLOR SW
ON when u-COM (24) (25) go H.
ILLUM +B SW
St
Q108 is turned ON when Q106 goes ON.
Q109 is turned ON when Q107 goes ON.
Q117
MOTOR SW
PLUNGER SW
MOTOR +B DRIVER
PLUNGER +B DRIVER
ILLUM +B DRIVER
ILLUM SW
PWR ANT SW
PWR ANT +B DRIVER
ON when u-COM (22) goes H.
ON when u-COM (21) goes H.
When Q110 goes ON,
Q112 is turned ON and mechanism motor starts rotation.
ON when Q111 goes ON.
When Q115 goes ON, Q114 is turned ON and illumination power is supplied
ON when p-COM (59) opens to turn Power supply IC (3) ON.
ON When u-COM (18) goes H.
When Q116 goes ON,
Q117 is turned ON and power is supplied to power antenna.
Q118
B-UP DETECT SW
ON when B-UP is detected.
Q119
SURGE DETECT SW
ON when Power supply IC (11) goes L.
Q120
HOLD DETECT SW
ON when u-COM (67) goes L.
Q121
HOLD SW
ON when Q118 goes ON. Puts n-COM in HOLD mode.
Q125
SVR CONTROL
ON when Q126 is turned ON by pt-COM (16) going L.
Q126
SVR SW
|_ ON when p-COM (16) goes L.
Q127
AMP STBY SW
ON when Q118 is turned OFF by power down.
Both AMP STBY and AMP MUTE go L.
Q201~204) PRE MUTE SW
ON when p-COM (17) goes L.
Q401
CD-CH MUTE SW
ON when CD CH MUTE goes H.
Q402
CD-CH RST SW
ON when Q@403 is turned ON by pressing CH RST buiton.
Q403
CD-CH RST SW
ON when CH RST button is pressed.

KRC-202/222/302/332/402/442
CIRCUIT
DESCRIPTION
IC1 : LC72358-9202 (X14-5400-XX)
Microcomputer
1. Terminal Connection
<< AMIN
68 | <— SNS
73 |-——— VDD
72|-—— VSS
71 |~+— E03
<+— LCTR
~
Oo
x
°
foo)
79 | <«— TEST1 78|-—> E01
76 |—— VSS 75 | ~+— FMIN
70|—— HCTR
67 | — HOLD
66 | «— S METER
77 |—» E02
O
XIN
TEST2
EV-CLK
EV-DATA
FM+B
AM+B
CH-DATAC
CH-DATAH
CH-CLK
CH-REQH
CH-CON
CH-REQC
FF/REW
TAPE IN
AMP STBY
SVR
MUTE
ANT-CONT
PCON
ON OO F&F WY +
LC7258- * * * x
T-ADV
MOTOR
PATE TA TA ae La ba tld
GREEN
onnnor owt om ©
NN NN OM OM ao om 9m 4
eo do ees 24-8
ooOoOwWwWwWS ' FO 1 &
PS oO eva oe
bas 3295056
-! _!
65 | — MUSIC
fre etttted ed et teed ee tt tt
BUCK UP
ACC
FM MUTE
CRSC OFF
ILLUM-ON
PON
IF CONT
SURGE
AM-SD
METAL
EQMUTE
DOLBY
LOCAL
AFC
FWD/REV
DK
SK
PANEL
BEEP

-KRC-202/222/302/332/402/442
CIRCUIT DESCRIPTION
2. Terminal description
= o
Function Description In HOLD mode
EV-CLK Electronic volume control - Clock fine. L
EV-DATA Electronic volume control - Data line. L
FM+B FM power control. L
AM+B AM power control. L
CH-DATAC | Changer data input. -
CH-DATAH | Changer data output. Last state
CH-CLK Changer clock input.
CH-REQH | Changer request output.
CH-CON Changer control.
CH-REQC | Changer request input.
FF/REW Tape - FF/REW detection. "L" = FF/REW.
TAPE in | Tape - Tape input. "L" = Tape mode.
AMP STBY | Standby output to power amplifier.
' “SVR Power amp muting output. — “H" =Muting H in 15 sec.
T ‘MUTE Audio muting output. "L" = Muting. H in 15 sec.
{ ANT-CONT | Tuner antenna control. "H" = Tuner mode.
PCON Power control "H" = ON.
Pin Name
Si0/PG3
SO0/PG2
SCKO/PG1
PGO
SI1/PF3
S01/PF2
SCK1/PF1
PFO
S$!2/PE3
$02/PE2
| SCK2/PE1
PEO
PD3
PD2
PD1
PDO
PC3
PC2
PC1
L
T-ADV Tape advance plunger output. "H" = ON.
Tape motor ON output "H" = ON.
2 PB3
3
24 PB2 GREEN Illumination - amber. "H" = ON. L
25 PB1 AMBER Illumination - green. "H" = ON. L
26 PBO DS! DSI "H" = ON.
27 SEL3 Destination type selection terminal. With pull - down resistor.
SEL2 __Destination type selection terminal. With pull - down resistor.
SEL1 Destination type selection terminal. With pull - down resistor.
SELO Destination type selection terminal. With pull - down resistor.
Vdd
LCD-DI LCD driver - Data input.
LCD-DO LCD driver - Data output.
LCD-CLK LCD driver - Clock output.
LCD-CE LCD driver - Chip Enable output.
LCD-RST LCD driver - Reset output.
i pa i fi ised sac as fa Vac Eh i
—|O|O
PA2
PAI
PAO
Vdd
PQO
PP3
PP2
PP4
PPO
PO3
PO2
PO1
POO
PN3
PN2
PN1
PNO/BEEP |
PM3
PM2
PM1
PMO
PL3
PL2
PL1
-
5 Ea ee |
BEEP Beep output (2.08 kHz).
PANEL | Panel detection. "L" = Panel detected.
SK | SK input. “H" = ON.
DK DK input. “H" = ON.
FWD/REV | Tape - FWD/REV input. “H" = FWD.
AFC Tuner - AFC output. "L" = During seek.
LOCAL Tuner - Local output. "H" = During seek.
DOLBY Tape - Dolby output. "H" = ON.
O/O;O/—|-—|}—-|-jOJ/OJOJO/O/O/O/O;O/O/O/o

KRC-202/222/302/332/402/442
Pin Name
Function
CIRCUIT DESCRIPTION
Description
In HOLD mode
PLO
EQMUTE |
Tape - EQ muting output.
PK3
METAL
Tape - Metal output. “H" = ON.
PK2
AM-SD
AM band - SD detection. "H" = Station detected.
PKI/INT14
SURGE
Surge detection.
PKO.INTO
PJ3
IF CONT
Tuner - IF counter ON output. "L" = ON.
PJ2
PON
Power ON. "L"= ON. "H" in 1.15 sec.
PJ1
ILLMI-ON
Illumination ON. "OPEN" = ON.
PJO
CRSC ON/OFF. "L" = OFF.
PIV/ADI5
CRSC OFF
PIO/ADI4
FM MUTE
"L" = when a station is detected in FM band. Vth = 1.2V.
PH3/ADI3
ACC
Acc detection. "H" = ON.
PH2/ADI2
BUCK UP |
Back-up detection. "L" = Power down. Recovery with |.
PH1/ADI1
| “MUSIC
Music detection. “L" = Music detected.
PHO/ADIO
S Meter
FM band station detection. "H" = Station detected.
HOLD
HOLD
Hold detection. "L" = Hold.
SNS
SNS
Power down detection.
LOTR
| LOTR
HCTR
IF counter input.
Phase detector error output.
Connected to GND.
"OPEN".
VCO input.
VCO input.
Phase detector error output. "OPEN".
Phase detector error output.
FM
AM
CD-CH
T.CALL FM
T.CALL AM
PWR OFF

J
3. Key matrix
#1: Keys of K/M type models other than the KRC-402/442.
#2: Keys of D type models. The J type model is basically identical to the D type except that TI is used in place of SDK.
#3: Keys of K/M type models other than the KRC-402/442.
#4: L/N type models.
KRO-202/222/302/332/402/442
CIRCUIT DESCRIPTION
KI5
SOURCE
*" POWER OFF
Ek
S|
PANEL
AUTO
# A-MEMO
LOUD
AUTO/LOCAL
3 A-MEMO
SDK(D)
" DKVOL ADJ
T1(J)
AUTO/LOCAL
5 A-MEMO
LOUD
* ILLMI
AUTO
3 A-MEMO
LOUD
Radio : 6
CH : M-RDM
DOWN
Radio : 3
Ta: METAL
CH : RANDOM
FM
* CRSC
AM
FM
* MONO
FM
* CRSC
FM
* MONO
Radio : 2
Ta : DOLBY
CH : T-SCAN
AM
= AT-SK.S
ON/OFF
AM
AM
Radio : 1
Ta: T-ADV
Radio : 4
CH : REPEAT
Radio :5
Ta: T-CALL
CH : D-SCAN
VOLUME
Vv
VOLUME
A
4. Destination type setting
Selected model and type
AUDIO
= VOL RET
SEL3 | SEL2
—t
*1
ATT
* LOUD
*2 ATT (D/J)
#3 ATT
*4
ATT
Selected model and type
~
KRC-442
The M type model is switchable to a K type model.
*in the table above, "1" means pull - up at a few ohms and "O" means OPEN (pulled down by software).
o!|ofo!o KRC-202 1 o |. o-)-0 KRC-157L
0 | 0 KRC-302 1 Oe oe 4
0 | 0 KRC-357L 1 o | 4 0 KRC-357N
o | oO KRC-157N 1 o | 1 4 KRC-332
o | 4 1 1 0 | 0 KRC-157D
o | 4 KRC-402 1/410/14 KRC-222
o | 4 1 1 1 0 KRC-357D
1 1 1 1

KRC-202/222/302/332/402/442
ADJUSTMENT
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
TUNER
(RECEIVER)
ALIGNMENT
POINTS
ALIGN FOR
M SECTION
DISCRI-
MINATOR
(A)
98.1MHz
Odev
60dB # (ANT input)
Connect a
DC voltmeter
to TP(F/E)
T
(F/E)
ANRC
(STOP
LEVEL)
(C)
98.1MHz
1kHz,£67kHz dev
Pilot: £ 7.5kHz dev
Setector:L or R
act 35dB # (ANT input)
()
FM
98.1MHz
Separation
10dB
—
STOP LEVEL
dss
AM SECTION
(D)
990 KHz
400Hz,30% mod
35dB x (ANT input)
=,
CASSETTE DECK SECTION
AZIMUTH
PLAYBACK
LEVEL
10
MTT-114
10kHz
KRC-402/443/302/332 ONLY
MTT-150
Connect a
AC voltmeter
to TP1
TAPE PLAY
TAPE PLAY
Adjust the azimuth for
each L ch / R chor
FWD /RVS becomes
maximum

KRC-202/222/302/332/402/442
ADJUSTMENT
(REAR VIEW)
AC Voltmeter Oscilloscope
¥
KRC-402/442
302/332 ONLY
Pee otrnnner rrr rrrrerrr: it tt fire Peay
(b) 300mV
bewenn enc tazeenee linn bend
i;
=—s
Lohfese}Reh
i
)
AM
SD
VR
2
AC
Voltmeter
a
Ere
!
(X14-54X
X-
X
X)
eas
Leh
Reh
iy
Se
en
ie
DISCRI.
T——
(a)
0V
DISCRI. TP
LC Voltmeter
11

KRC-202/222/302/332/402/442
12
ADJUSTMENT
Head Angie Adjustment
Head height alignment procedure
e During FWD transport, adjust screws © and © so that
line A of 2-line tape passes through the center of the head
shield plate (white section).
e During REV transport, adjust screws @) and @) so that
line B of 2-line tape passes through the center of the
head shield plate (white section).
e After the alignment above, reverse th transport direction
and check the FWD alignment again. If it is deviated,
perform alignment again. (Tape used: SCC-1659, manu-
factured by A-BEX).
TAPE SPEED
(2LINE TAPE)
HEIGHT
HEIGHT/AZIMUTH

4e | 6F 6H
3G | 4F | 4E | 3H] 3H | 3H | 3H
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117/118
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electric shock, leakage-current or resistance measurements shall be
carried out (exposed parts are acceptably insulated from the supply
circuit) before the appliance is returned to the customer.
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