Kenwood KRC-2001 User manual

KENWOOD
KRG-200'
STEREO
CASSETTE
RECEIVER
Knob
Knob Knob
ob
Kn :
188804)
(K27-1581-04)
(K27-1580-04)
(K27-1579-04)
—
{K29-1
889-04)
Knob
Dressing
pane!
LCD
Assy
Knob
(K29-1888-04)
(A21-0493-03)
(B38-0066-05)
(K29-1888-04)
Heat sink
(FO1-0681-03)
E
'
2
e-
—-————-
Cord
with
connector
(E30-1430-15)
Cord with plug
(E30-1429-05)}
Cord with DIN
connector
(E30-1431-15)

ee
DISASSEMBLY FOR REPAIA
DISASSEMBLY FOR REPAIR
1.
Remove
4
screws
retaining
the
top
cover
and
pull
it
up
(0.8)
2.
Remove
4
screws
and
remove
bottom
plate
(‘O.
8)
3.
Remove
4
screws
and
remove
the
panel
assy
([email protected])
4,
Remove
4
screws
retaining
the
mechanism
and
pull
©
out the connectors (@,.@.@) ©
5. Remove the nuts from the axis and take off the solder
from the PCB and pull out the connector (@. @. ®)
more than
Tem

| KRG-2001_
DISASSEMBLY FOR REPAIA
6. Pull out the PCB from the bottom main PCB (®. @.
®)
7. Removes the screw of display assy ( (B ) and remove
six screws of heat sink( @& . )
Remove
the
screw
(
&®
)
and
pull
out
the
connector
®
(@ )
8. Remove the screws ( @) ) and( @ )

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) KRe-2001
CIRCUIT DESCRIPTION
Description of components.
CONTROL UNIT (X11-2230-10)
Components Application/Function _ Operation/Condition/Compatibility
Qi LO/DX SW
Q2 FM IF AMP
LOUDNESS SW
FM IF AMP/DET
FM MPX
NR
NR CONTROLL
DIN OUT AMP
TONE AMP
EQ AMP
SYNTHESIZER UNIT (X14-1870-10)
Application/Function Operation/Condition/Compatibility
AGC CUT
ee OT ey
|_a2_
|
~_STATION
DeTECT
|
Tuned
ONWhenthebroadcastsignalisreceved.
}__03,4
|
FM
BAND-WIDTH
SW
|
Tuned
ONwhen
SEEK
operation
seeking)
pa
OR
NS
ee
ee
i
OR
NETS
ee
eo
eel
|
os
ag
TUNER +B SW Turned ON when TAPE mode
FM +B SW
Q10 AM +B SW
Q11, 12 ACC AVR (+9 V)
Q13 TAPE +B SW
L.P.F DC AMP
BACK UP AVR (+5 V)
CE-CONTROL
MUTING
EQ MUTE DRIVER
TAPE MUTE DRIVER
MUTE DRIVER
MUTE DRIVER
AGC CUT
Turned. OFF when ACC is ON
For equalizer amp. Turned ON when Radio mode, FF/REW mode.
Turned ON when FF/REW mode
For power amplifier. Turned ON when ACC is ON.
MICROPROCESSOR
POWER AMP
(1/4) F/R indicator, (2/4) ST indicator, (3/4) STATION DETECT indicator,
(4/4) TAPE MODE indicator
(1/4) MEMORY switch, (2/4) MANUAL DOWN switch, (3/4) MANUAL UP switch,
(4/4) SEEK switch
AND IC
AND IC

KRC-2001
CIRCUIT DESCRIPTION
AND-GATE
FOR
CPU
KEY
MATRIX
OPERATION
DESCRIPTION
A PIN 7-—- GND
a
B PIN 14*--- Vpp (5 V)
— Vpp (5 Vv)
A
— OV
B
Qa
CPU Key Matrix Operation
The source clock from the CPU is input to A-input via the
AND-GATE at any time to apply the control signal to B-
input.
When the signal is input to B-input, the output Q goes
high and input as the CPU key input. When the B-input is
low level, output O is always low. Output Q is synchro-
nized with input A.

CIRCUIT DESCRIPTION
Synthesizer Unit u.-Com: «PD 1708G
FUNCTION OUTLINE
Receiving
frequency,
Channel
spacing,
Reference
frequency,
Intermediate
frequency
FM band
Frequency
range
Channel
spacing
Reference
frequency
Intermediate
frequency
87.9
~107.9
MHz
200
kHz
25
kHz
10,700
87.50~108.0
MHz
*
60
kHz
12.5
kHz
10,700
*
MANUAL
25
kHz
AM band
Frequency
range
Channel
spacing
Reference
frequency
Intermediate
frequency
530
~
1620
kHz
10
kHz
10
kHz
450
kHz
522~1611
kHz
9kHz 9kHz
450
kHz
163~281
kHz
*
QkHz
1
kHz
450
kHz
*
MANUAL
1
kHz
Tuning Function
{1) Auto Tuning (Sawtooth wave mode)
Seek Up: Once a station is tuned, it is held tuned.
(2) Manual Tuning (Sawtooth wave mode)
Manual Up/Down: Frequency is advanced up or
down in steps by pressing the
push switch.
Pressing for a half second or
more advances it up or down
continuously until the switch is
released.
(3) Preset Memory Recall
6 stations on each FM, MW, and LW band can be
preset independently with the 6 buttons. The last sta-
tion is stored in memory for each band when power is
turned off.
Tape Function
(1) Tape running indicator
(2) METAL control
(3)) DOLBY contro!
Radio Function
(1) LOC (local) contro!
(2) MONO control
Clock Function
(1) 12-hour display
Other Functions
(1) LOUDNESS control
(2) NR (noise reduction) control

KAC-2001
CIRCUIT DESCRIPTION
TERMINAL DESCRIPTION
Terminal Configuration (Top View)
[+7 26
a P)
7) 24
[+23
ees PY
uPD1708G-618-00 p21
(TOP VIEW) [_____} 20
[___}19
fT C—i*d‘O'V
dA
16
[715
14
Pin Name Pin Name
LCD4 KS, (PB,}
LCD3 KS, (PBo)
LCD2 BANDZ/N.R
LCDi METAL-LOC
COM2 LOUDNESS
COM1
5G |e |e |~|o lor] a] | |=
CE
*
Xl
XO
AF MUTE (PA3)
BAND 1 (PA,)
KS,/K; (PA,)
KS,/K, (PA,)
Ks
Ky
K,
Ko
KS, (PB,)
KS, (PB,)
8
*
Not
used.

Pin description
KRG-2001
CIRCUIT DESCRIPTION
Pin Name
Description
LCD segment signal
LCD segment signal output pin (1/2 duty, 1/2 bias LCD should be used. Frame
frequency: 100 Hz, Drive voltage: VDD)
LCD common signal
LCD common signal output pin
Power input
Device power supply pins
During device operation, 5 V + 10% voltage is supplied via these pins. Either of them
can be used for supplying the power individually. The rising time of VDD should be less
than 500 ms (0 to 4.5 V). When the rising time is too long, or when the VDD is not
lowered completely to O V and then raised to 4.5 V from the voltage lower than the
operating rate, the diode switch condition for initialization is not read out correctly. In
such cases, use the CE pin so that the diode switch status can be read out for
initialization.
FM VCO input
This pin inputs the FM station output signal.
Since it incorporates the AC amp, cut the DC signal with the capacitor.
AM VCO input
This pin inputs the AM station output signal.
Since it incorporates the AC amp, cut the DC signal with the capacitor.
Ground
Connect to the ground terminal of the set.
Error Out
AF MUTE
Charge pump output of the phase detector consisting of PLL. When the frequency
divided by the oscillating frequency is higher than the reference frequency, these pins
output high level signals, and when it is lower than the reference frequency, they go
low. When the frequency (divided by the oscillating frequency) is coincided with the
reference frequency, it enters into the floating status.
Chip Enable
Crystal resonator
Mute Out
This pinis used to input the selected signal from the device. When operating the PLL
section, this pin goes high, and when the PLL section is stopped, it goes low. When at
low level, the display goes off. However, a low level signal below 134 us or high level
signal is not accepted.
Connectors of the crystal resonator.
Connect the 4.5 MHz crystal resonator.
This pin outputs the muting signal to eliminate shock noise when the PLL is unlocked
and pop noise when switching between Tape and Radio, and is active low.
(CMOS output)
For timing details, refer to the AF Mute Out Timing Chart. When the CE pin is low, this
pin is active low.
Band Out
FM/MW switching output pin
FM: High
MW: Low
When the MODE switch is set to “1” (Tape mode), this pin is low.
When the SDK is provided, follow the SDK section.
Key return signal source and
Key return signal input
This becomes the source of key return signal to read out the diode matrix for
initialization only when the power is turned on for the first time (rising time of VDD} or
when the set is returned from the back-up condition (CE: Low to High).
Then, this inputs the key return signal for the key matrix. Insert the pull-down resistor.
(CMOS input /output)
Key return signal source and
Key return signal input
This becomes the source of the key return signal to read out the diode matrix for
initialization only when the power is turned on for the first time (VDD rising time) or
when returning from the back-up condition (CE goes high from low).
Then, this inputs the key return signal for the key matrix. Insert the pull-down resistor.
{CMOS input /output)
Key return signal input
This pin inputs the key return signal for the key matrix. Insert the pull-down resistor.
(CMOS input)
Key return signal source
This pin outputs the key return signal for the key matrix.
Since the synchronous current is greatly lowered because of its configuration, the
reverse-current prevention diode will be not necessary for the key source side.
(CMOS output)
METAL/DX/LOC | LOC Out
In radio mode: DX/Local On/Off output pin
When “LOC” is displayed on the LCD panel, high level signal is output. When it is not lit,
low level signal is output. (When the power is turned on, low level status is initialized.)
In tape mode: METAL On/Off output pin
When “METAL” is displayed on the LCD panel, low level signal is output. When it is not
lit, high level signal is output. On initialization when the tape power is turned on, high
level is output.

10
CIRCUIT DESCRIPTION
Pin Name
Symbol
Description
LOUDNESS Loudness Out
LOUDNESS output pin
When
“LOUD”
is
displayed
on
the
LCD
panel,
low
level
signal
is
output.
When
it
is
not
lit,
high
level
signal
is
output.
When
the
power
is
turned
on
first
(VDD
rising
time),
low
tevel
signal
is
output.
(CMOS output)
BAND2/NR
When Band A is “0” or “1” and the NR selector is “1”, this
functions as the NR on/off output pin. When “NR” is dis-
played on the LCD panel, high level signal is output.
When it is not lit, low level signal is output.
This pin.can be operated in the TAPE/RADIO mode.
On initialization when the power is turned on, this pin is at
low level.
When BAND A is “0”, “1” and the NR selector is “O”, this
function as the WIDE-ADV on/off output pin.
@ Inthe Radio mode:
This functions as the WIDE on/off output pin.
When “WIDE” is displayed on the LCD panel, high level
signal is output, and when it is: not lit, low level is
output.
DOLBY output pin
When
“DOLBY”
is
displayed
on
the
LCD
panel,
high
level
signal
is
output.
When
itis
not
lit, low level signal is output.
On
initialization
when
the
power
is
turned
on,
low
level
is
output.
@ Inthe Tape mode:
This functions as the ADV on/off output pin.
When “ADV” is displayed on the LCD panel, high level
signal is output, while it is not lit, low level is output.
On initialization when the power is turned on first, it is
at low level.
When BAND A is “0” and the NR selector is “O” (SDK oper-
ation is normal only when in this status), and BAND B is
“1”, this pin functions as the BAND 2 output. BAND 2 be-
comes the band switching output port in combination
with BAND 1.
Output
BAND 1 BAND 2
ee
ee Ne