Kenwood KRC-356D User manual

CASSETTE RECEIVER
Photo is KRC-356L
Knob (VOL.)
Knob (EJECT)
(K25-0661-03)
(K24-1562-04)
HIGH POWER 25wx4
KENWOOD |
Front glass
(B10-1593-03)
Screw (SEMS)
(NO9-1885-05)
Ss
KRC-356D/L/N
SERVICE MANUAL
CASSETTE RECEIVER KRC-3S6L
KENWOOD
© 1994-12 PRINTED IN JAPAN
B51-6779-00( N)2307
Cassette lid
Knob (REW)
(A53-1600-03)
Knob (FF)
(K24-1564-04)
Knob (RESET)
(K24-1563-04) (K24-1560-04)
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Escutcheon
(BO7-2057-02)
M.RDM
Panel ass'y
(A64-0380-02) : KRC-356D
(A64-0381-02) : KRC-356L
(A64-0382-02) : KRC-356N
Mounting hardware ass'y
(J21-7564-13)
Knob (RELEASE)
(K24-1561-04)
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Lever DC cord Plastic cabinet ass'y
(D10-2984-04)
(E30-4227-05)
(A02-1443-03)

KRC-356D/L/N
CONTENTS / CONNECTIONS
CONTENTS
PC BOARD (COMPONENT SIDE VIEW) ................ 23
CONNECTIONS os sicssssovssessncccontdaceocctassstvacecsiieecesteies 2 PC BOARD (FOIL SIDE VIEW) ..............eeeeeeeeeeees
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CIRCUIT DESCRIPTION .....0.0.. oe. cece eeeeseeteeeeee il EXPLODED VIEW (MECHANISM)
DISASSEMBLY FOR REPAIR (MECHANIS®) ....... 10 EXPLODED VIEW (UINIT) ...... ccc cceeceesseetrseenees
MECHANISM OPERATION DESCRIPTION ........... 11 PARTS LIST ociicscccasisienicicinnteesesseeuiisiade casted
ADJUSTMENT ..........ccecccccsessscssssseecsseeeceeseeeeeneeens 20 SPECIFICATIONS o.oo. eee eeeee eens
CONNECTIONS
* Circled numbers indicate the procedures
described in the Installation Procedure
To connect the disc
changer, consult your
disc changer manual!
(optional)
Rear left outout(White)
(KRC-356D/356L/356N oniy)
Power amplifier
(Soid separately)
Rear
speakers
Power control input
-®
Ignition key
switch
Battery @ ©
ACAUTION
When two speakers are connected to the
system, be sure to connect both of them to the
front output or rear output. In other words, do
not connect the positive connector of the left
speaker to the front output and the negative
connector to the rear output.
Hes
@O@
ayes. White/Black
Front left
White
Gray/Black
Sra,
Kenwood disc change’
—- ©®
<—_©®
Output
Changer connection cable (Supplied
with the Kenwood disc changer)
FM/AM antenna input
disc changer control
Rear right output (Red)
(KRC-356D/356L/356N only) [H1é
Power/Full a nah power antenna Wiring
contro! cable (Blue/White)
[ P.cont ouT } harness
(Accessory)
Ignition cable (Red) @
Battery cable (Yellow) ®
Ground cable (Black) © {To car chassis)
To prevent fire when the ignition cable (Red) or
battery cable (Yellow) is short-circuited by coming
into contact with the vehicle chassis (ground), only
connect the power supply after making the fuse box
connections
sees White/Black
Front left ® 7
speaker ront left
SORE White
- seams, Gray/Black
Front right Sols y
speaker O@Ee ~
Suen Green/Black
Rear left 20s sa (FERAL ]
speaker @ Owen os
lack
. OCS Purple/B
Rear right Rear right
speaker OLO)i=-- = - purple

KRC-356D/L/N
BLOCK DIAGRAM
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KRC-356D/L/N
CIRCUIT DESCRIPTION
Description of components
SYNTHESIZER UNIT (X14-523X-XX) 2-70: KRC-356D 2-7
Component
Component Name
Application/Functions
1: KRC-356L 2-72 : KRC-356N
Operation/Condition/Compatibility
]TAPE EQ AMP
Q58
SWITCH UNIT (X25-727X-XX)
DTC144EK
LC75852E
LCD Driver with key input
IC1 BA328F
IC4 LA1143B [EM {F AMP FM IF signal amplification.
IC5 TDA7340P___[E.VOL _/ NC _MPX FM NC MPX source selector ISO AMP.
IC6, 7 AN7190K Power AMP _!CéiRear], IC7[Front]
IC8 BA3906-V4 SYS-AVR IC
IC9 { LC72329-89XX _|Microcomputer LCD Driver various control. 22:256L/N, 24:256D
IC10 NJM4565M SDK Buff SDK IC input buffer. BPF of BK.
IC11 TDA1579T SDK IC Detection of SK and DK from the composite signal.
Q3, 4 DTC143TK EQ-MUTE SW |
Q5 DTC144EK FM LOCAL SW
Q6 2SC2413K FM IF AMP
Q7 DTC144EK AFC SW OFF during seek. ON during reception.
Q8 DTC144EK |Band MUTE SW
ag 2SC2412K FM S meter Buff
Q10 2SA1037K {CRSC SW |
Q12 2SC2412K CRSC CONTROL Buff
Q13 DTA144EK BS SW LW/MW SW
Q14 2SC2412K ACC Detection SW
Q15 2SC2412K [Surge detection SW
Q16 2SC2412K B.U Detection SW E——
Q17 2SB1277 P.CON output
Q18 2SA1037K
Qi9 | DTA124EK P.CON SW
Q20 2SC2412K
Q21 DTA144EK B.U Detection SW
Q22 DTA144EK PANEL Detection SW |
Q24 DTA144EK B.U Detection SW |
Q25 DTA144EK
Qe. DTC144EK AVR IC STBY SW
227 25B1184___‘iWumination AVR
Q28 2SC2412K
— i BTClaaEK lllumination AVR SW
Q37 2SB1443
Q38 pena
Q39 2SA1036K PANEL +5V SW
Q41 2SA1037K [MUTE Driver
Q42 DTC144EK MUTE ite based on MOMentary
ipower failure surge detection
Q43 2SC2412K DS! LED driver
Q44_ | 2SK536 PLL_LPF [
O46 DTA144EK Power ON SW
Q50 DTC144EK [SK SW Switches SK ON/OFF according to band muting.
Q53-56 DTC143TK MUTE SW
Q57. DTA144EK AM LOCAL SW
DTC144EK
DTA144EK
LCD Driver ON SW

KRO-356D/L/N
CIRCUIT DESCRIPTION
Microprocessor
IC9
:
LC72329-XXXX
(X14-524X-XX)
8924:
KRC-356D
8922:
KRC-356L/N
Terminal connection
=
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B28 1
YO 30 z
SsHuR (ie
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SONNE NT TAMER —l[WJU|- S
gussvssaeocalals
XxrFuWUW> tb SlHn cr <i[ejrlfo
\ 8 reREeR RARE 8 & & 8
Xin 1 64->> COM2
TEST2=—)
2
63-—>
S1
EQMUTE
DKin PG3l—) 3 626 > S2 TADV
SKin PG2t—y 4 > S3 DOLBY
SEL1
PGi)
5
6o-
=>
S4.
MOTOR
SELO PGOC>) 6 ssf > S5 LOC
MUTE PH3<— 7 58-—> S6 AGC
PON
PH2<—J8
s7——>
S7
AFC
BEEP PH1<— 9 s6- => S8_ IF CONT
LW/MW PHO<—J10 s5-—> S9_ METAL
LDI
PF3CUA11
546
>
S10
CRSC
EVDATA
PF2<3)12
LC72329
53h
>
S11
SEL2 PF1C—> 520 > S12
REQC PFOC 14 ——- $13
DATAGC
PE3SC—yA15
50h
>
S14
DATAH
PE2<.—16
490"
>
S15
SCK
PE1&>
48—-—>
S16
REQH
PEO<—418
47>
$17
CHON PD3<—419 44-—> S18
ILLON
PD2<.—J20
45-5
>
S19
PCON
PD1<—j21!1
44>
S20
LRST
EVCLK
PDO<—j22
430
>
S21
GREEN
PC3 <—423 42-—> S22 AMBER
PC2<Ja4\ Lai> $23 DSI
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KRC-356D/L/N
Terminal description
C
IRCUIT DESCRIPTION
.
:
bone
During
Pin.No
Name
|/O}
Function
|
Description
HOLD
3
PG3
| DK
in
DK
signal
input
terminal.
-
4 PG2 | SK in SK signal input terminal.
5, 6 PG1, 0 | SEL 1, 0 [Destination select terminai. -
7 PH3 | O MUTE _ [Audio muting contro! output. ON="L". L(15s, then H)
8 PH2 0 PON Peripheral circuit power control terminal. 1s, then L
9 PH1 ie) BEEP BEEP output. L
10 PHO |0| LW/MW ___[AM Band LW/MW select. L
11 PF3 ] LD __|LCD driver data input. :
12 PF2 0; EVDATA __ {Electronic volume DATA input-output. L
13 PF1 | SEL 2 Destination select terminal. -
14 PFO ] REQC [Communication request from the CD-Changer.
15 PE3 | DATAC Serial data input, Data input from the CD-Changer. :
16 PE2 0 DATAH __|Serial data output, Data output to the CD-Changer. L
17 PE | SCK Serial data input, Clock input from the CD-Changer. L
18 PEO ) REQH Request HU, Communication request to the CD-Changer. L
19 PD3 0 CHON Output when the CD-Changer is ON. ON="H". Also used as the audio L
iswtching output. |
20 PD2 O ILLON Illumination power control terminal. L
21 PD1 ie) PCON Power control output. L
22 PDO 0 EVCLK Electronic volume CLK output. L
23-26 PC3-0 0} (NC) Not used. (L output) L
27,28 | PB3,2 [0 (NC) Not used. (L output) L
AM mode FM mode TAPE or CD-CH mode
29,30 PB1,0 | Oj}FM/AM S1, SO|S1 H L H L
SO H L L
[Vdd iV,
32 PA3 FF, REW Tape fast winding detection input. "L'=During FF/REW.
| | PACK in [Tape detection input. "L'=Tape mode.
| FWD/REV_ |Tape transport direction input. "H'=FWD, ‘L"=REV.
| BUDET Buck-Up detection. (Voltage failure detection) :
O} (NC) _[Not used. (L output) L
0 LDO LCD driver data output terminal. L
[0 LCCLK {LCD driver CLK output terminal. L
O| LCE LCD driver CE output terminal. L
O (NC) Not used. (L output) L
O} DSI DSI ON/OFF output. Blinking
OQ} AMBER __/AMBER illumination output. | L
0 GREEN GREEN illumination output. L
QO} LRST LCD driver reset output. L
QO} (NC) Not_used. (L output) L
0 CRSC CRSC ON/OFF output. ON="H’". L
QO} METAL [METAL output. METAL="L". | L
0 IF CONT {IF COUNTER control. L
O AFC _|AFC control output. ON="L". L
O| AGC _|AGC cut control output. ON="H". L
O LOC Local output. AM/FM logic inversion. L
O MOTOR _ |Tape motor control. L
0 DOLBY _|DOLBY output. L
1) TADV__T-ADV plunger output. "H"=ON. L
O; EQ-MUTE {Tape Equalizer Mute control output. ON="H". L

KRC-356D/L/N
CIRCUIT DESCRIPTION
Name
Function
Description
During
| | HOLD
COM 2,1_| 0
|
|
]
COM 2, 1 {LCD Common output. L
PANEL Panel detection switch. Detected="L". -
HOLD Power input. Return at 4
ES RESET (Connected to Vda)
; FM/AM station signal detection input. (Vth=0.75V)
a Senn "H'=Station detected.
HCTR IF COUNT |AM Band IF Counter.
LCTR SEL 3 Destination select terminal.
SNS 1 | MUSIC __|Music detection in tape mode.
Vdd - Vdd BV.
FM,AM i rt FM, AM in [VCO input .
Vss - Vss (Connected to GND)
E01,2 E01, 2 Phase Detector Error output.
Test 1,2 | 1 | - [(Connected to GND)
X out, in X out, in |4.5MHz X'tal.
+
INT
HOLD
Key matrix
KI1 (52) KI2 (53) KI3_ (54) Kl4 (55) KI5 (56)
SOURCE
"POWER
PANEL
DETECTION
AM UP DOWN CLOCK
AUDIO VOLUME VOLUME ATT
“VOL RETURN A Vv =LOUD
DxAUTO LOCAL
AUTO
MANUAL
:
SDK
(D
type)
RADIO : 6 / SK-SEEK LOUDNESS
FAUTO
MEMORY
PRP
(Except
D
type}
RADIO : 1 . RADIO : 3 RADIO : 5 |
TA: T-ADV pee TA : METAL TA: T-CALL ie

KRC-356D/L/N
CIRCUIT DESCRIPTION
Audio signal processor
Audio processor
¢ Mute, soft mute and zero crossing mute.
¢ One differential, two stereo and two mono inputs.
© Differential phone input
¢ Volume, bass, treble and loudness control.
© Four speaker attenuators with independent attenua-
tion control.
Stereo decoder
e Adjustment free integrated 456kHz VCO.
¢ High cut control.
e Stereo blend.
Noise blanker
© Integrated high-pass filter.
e Noise rectifier output for quality detection.
¢ Programmable trigger threshold.
Pause detector
¢ Programmable threshold.
All functions programmable via I?C bus.
Block diagram
IC5 : TDA7340P (X14-1523-10)
Description
The TDA7340 I?C bus controlled audio signal proces-
sor contains all signal processing blocks of a high per-
formance car radio, including audio processor, stereo
decoder, noise blanker, pause detector and different
mute functions.
The use of BICMOS technology allows the imple-
mentation of several filter functions with switched ca-
pacitor techniques like fully integrated, adjustment free
PLL loop filter, pilot detector with integrator and two
19kHz notch filters.
This minimizes the number of external components.
Due toa highly linear signal processing, using CMOS-
switching techniques instead of standard bipolar multi-
pliers, very low distortion and very low noise are ob-
tained also in the stereo decoder part. The audio pro-
cessor contains several new features like soft mute,
zero-crossing Mute and pause detector.
Very low De stepping is obtained by use of a
BICMOS technology.
DEMODULATOR| zoe} | jolts | NOISE
BLANKER
LP NOTCH

KRC-356D/L/N
CIRCUIT DESCRIPTION
Audio processor part
Features :
Input multiplexer
e Differential CD stereo input.
© Cassette stereo input.
© FM Stereo input from stereo decoder.
¢ AM input
Mono or stereo mode (Programmable)
© Beep input (Only in AM mono mode)
¢ Telephone differential mono input
© Gain programmable in 3 x 3.75aB steps.
Loudness
© Fully programmable.
¢ 15 x 1.25dB steps.
Volume control
e 1.25dB coarse attenuator.
© 0.31dB fine attenuators.
© Max gain 20dB.
¢ Max attenuation 59.69dB (Plus loudness).
Bass control
e +7 x 2aB steps.
e 2nd order symmetrical or non symmetrical frequency
response (Programmable).
Treble control
¢ +7 x 2dB steps.
Speaker control
¢ 4 independent speaker control in 1.25dB steps
¢ Control range 37.5dB.
¢ Independent speaker mute.
Mute functions
e Direct mute.
e Zero crossing mute with programmable threshold.
¢ Soft mute with external defined slope.
Pause detector
¢ Programmable threshold.
© Delay time defined by an external capacitor.
Stereo decoder part
Features :
¢ Integrated 19kHz notch filter for pilot cancellation.
© On chip filter for pilot detector and PLL.
e Adjustment free voltage control LED oscillator.
e Automatic pilot dependent mono/stereo switching.
e Very high inter modulation and inter reference sup-
pression.
e /?C bus controlled (STD off, forced mono, stereo).
e High cut control.
e Stereo blend.
Noise blanker part
Features :
e Internal 2nd order high-pass filter.
e Noise rectifier output for signal quality detection.
¢ Programmable trigger threshold.
e Trigger threshold dependent on high frequency
noise.
¢ Blanking time programmable by external capacitor.
e Very low offset current during hold time due to
OPAMPS with MOS inputs.
e Level input for additional spike detection on field
strength.

KRC-356D/L/N
DISASSEMBLY FOR REPAIR (MECHANISM)
REMOVAL
1. Remove screw (155) (@). 4. While pressing in on the eject lever (61), remove the holder
2. Rotate the lifter (43) to the left and lift it up to remove (@). (48) (@ )
3. Remove the rod (52) from the eject lever (61) (@).
ee <
- <I ae
SET UP
1. While pressing in on the eject lever (61), attach the holder 6. Align the lifter (43) with the chassis (1) projections and move
(48) (@). it to the right to engage (see diagram) (@).
2. Insert the holder’s (48) projecting tab into the push plate’s 7. Secure the assembly by attaching the screw ( @).
groove (Q).
3. Insert the rod (52) into the hole in the eject lever (61) @).
4. While lifting up the holder (48), engage the lifter (43) (@).
5. Move the lifter (43) down so that it aligns with the eject
lever’s (61) cut out (@) section.
10