Kenwood KRC-444D User manual

KRC-444D/L
KENWOOD
SERVICE MANUAL
©1986-7 PRINTED IN JAPAN
BS1-3008-00 (O) 1068
Knob (Button) Panel ass‘y * Knob (Button) Handle ass’y
(K27-1645-04) x2 {A20-) (K27-1651-04) (KO01-0078-03)
|
Knob (Button) | Knob (Button) | Knob (Button)
(K27-1364-04) (K27-1652-04) (K29-2582-04)
i | |
Knob (Button) | Knob (Button) | Knob (Button)
1
Knob
Knob
(Button)
|
|
(K29-0440
-03)
|
(K29-2415-04)
|
(K29-2445-04)
|
{K29-2416-04))
(K29-2442-04)
x6
!
|
|
Knob
(Button)
Knob
(Button)
_
Knob
(Button)
Knob
(Button)
(K29-2583-04) (K29-2443-04)
(K29-2444-04)
(IK29-2583-04)
x2
Metallic cabinet ass’y
{A01-1430-13)
Cord with connector
: (E30 -1497-05)
* Refer to parts list on page 27,
Photo is KRC-444D.

KRC-444D/L
DISASSEMBLY FOR REPAIR
. Remove three screws retaining the top cover (@).
. Remove the top cover in the directions of arrows C2) ).
. Remove five screws retaining the bottom cover (@).
. Remove the bottom cover in the directions of arrows
(@).
BWN-
5. Remove volume knob (@).
. Remove eject and FF. REW. knob (@).
7. Remove four screws retaining the handle with a hexagon
wrench ‘@ ).
8. Remove the front panel in the directions of arrows
(©).
oO
9. Remove two screws retaining the mechanism ass’y C9) ).
10. Extract the connectors (CN1, 5) of the synthesizer
unit (X14-1952-70) (QD).
11. Remove the mechanism ass‘y in the directions of
arrows ().

KRC-444D/L
DISASSEMBLY FOR REPAIR
12. Extract the connectors (CN2, 3) of the S.D.K. unit
(X13-5432-70), remove the synthesizer unit (X14
-1952-70) in the directions of arrows (® ).
13. Remove the grounding terminal of the synthesizer
unit (X14-1952-70) ( ®).
14. Extract the connectors (CN1, 4, 6) of the synthesizer
unit (X14-1952-70) (Q)).
15. Extract the flexible PC board from the connector
(CN7) of the synthesizer unit (X14-1952-70) in the
directions of arrows (® ).
16. Remove two screws the shassis ( @%).
17. Resolder the synthesizer unit (X14-1952-70) foil side
and shassis ( @ ).
18. Resolder the tuner unit (X05-3182-70) and_ shassis
(®).
19. Remove four screws retaining the front shassis (@).
20. Remove volume nut (@ ).
21. Remove four screws retaining the synthesizer unit
(X14-1952-70) ( @)).
22. Extract the synthesizer unit (X14-1952-70) of the
shassis in the directions of arrows (@® ).
REMOVING THE POWER IC (X14-1952-70) (1C4)
1. Remove twe screws retaining the shassis (@).
2. Remove |C4 from the synthesizer unit (X14-1952-70)
foil side (@).
3. Extract IC4 (X14-1952-70) in the directions of arrows
(©).

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KRC-444D/L
CIRCUIT DESCRIPTION
Description of Components
TUNER UNIT (X05-3182-70)
Component Use/Function Operation/condition/compatibility
FM IF Detection
Noise Canceller
MPX
LOCAL/DX SW
IF Gain
ANRC Buff.
CRSC Driver
S.D.K. UNIT (X13-5432-70)
Component Use/ Function Operation/condition/compatibility
1C1 ve TAPE EQ AMP
IC2 SK DECORDER
IC3 DK DECORDER
Qi METAL Select OFF when METAL mode.
Q2 DK AMP DK signal (125Hz) AMP.
Q3 DK AMP GAIN Select ON when DK mode (Amp gain of Q2 turns high.) 17mV—50mV (TP1)
04 Buffer Inverter ON when DK mode.
Q5 125Hz VCO STOP ON when SDK mode. (VCO stops when SDK is OFF.)
Signal (TAPE/RADIO) Select ON when TAPE mode. (OFF when a signal is interrupting.)
Signal (TAPE/RADIO) Select ON when DK mode.
SYNTHESIZER UNIT (X14-2952-70)
Operation/condition/compatibility
IC1 Controller
1C2,1C3
POWER AMP
ICS PRE-OUT AMP
Q1,Q2 9V AVR
FM Power supply Select
SDK Power supply Select
ON when FM/SDK mode.
ON when SDK mode.
Q6,Q7 AM (MW/LW) Power supply Select ON when AM (MW/LW) mode.
Q8,Q9 MW Power supply Select ON when MW mode.
Q11,Q12 Mute Drive ON when pu-processor Mute, Mech Mute mode.
Q13,014 TAPE Power supply select ON when tape is loading.
5V AVR
ACC OFF Mute Drive
Microprocessor CE SW
Buffer AMP
LOUD SW
LOUD SW
Q25 Muting
Q26 Muting
VOL UP
SK STOP
MONO SW
Q31 SD (Station Detector)
BAND Select SW
BAND Select SW
Mute SW
ST IND Prohibit Release
Q15
Q16
017,Q18
Q21 ,Q22
OFF when Acc signal is down.
ON when Power SW is ON (CE terminal turns Low to High.)
ON when LOUD SW is ON. (L ch)
ON when LOUD SW is ON. (R ch)
ON when Muting. (L ch)
ON when Muting. (R ch)
OFF when VOL UP mode.
ON when SK IND lit on.
ON when MONO SW is ON.
ON when SEEK STOP mode.
ON when Micro-processor BAND 1 terminal is ‘““H’’.
ON when Micro-processor BAND 2 terminal is ‘’H’’.
OFF when Micro-processor Mute signal is output.
ON when SDK mode.
Q39 BAND Key Prohibit SW ON when TAPE mode.
041 ,Q42 LPF (FM/MW)
043,044 LPF (LW)
ON when FM/MW mode. {OFF when LW mode.)
OFF when FM/MW mode. (ON when LW mode.)
ON when FM/MW mode. (OFF when LW mode.)
ON when AM (MW/LW) mode.
LPF SW
LPF SW
LPF SW
MONDO Display Prohibit
O46
Q47
048,049

KRC-444D/L
CIRCUIT DESCRIPTION
AND-GATE For CPU Key Matrix
Operation Description
A 1} B PIN 7 -—- GND (OV)
B
PIN
14
----
Vpp
(SV)
Vpp (5V)
* 2 on a
GND (OV)
Synthesizer Unit .-Com: u.PD 1708G
FUNCTION OUTLINE
Receiving frequency, Channel spacing, Reference frequency, Intermediate frequency
FM band
Frequency range Channel spacing
87.50~ 108.0 MHz * 50kHz
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 Q is always low. Output Q is synchro-
nized with input A.
Reference frequency Intermediate frequency
12.5 kHz 10,700
“MANUAL 25 kHz
AM band
Frequency range Channel spacing
Reference frequency Intermediate frequency
522~-1611 kHz 9 kHz
9 kHz 450 kHz
153 ~281 kHz " 9kHz
* MANUAL 1 kHz
Tuning Function
(1)
(2)
Auto Tuning (Sawtooth wave mode)
Seek Up: Once a station is tuned, it is held tuned.
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.
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.
1 kHz 450 kHz
Tape Function
1) Tape running indicator
2) METAL control
Radio Function
1) MONO contro!
Other Functions
1) LOUDNESS control

KRC-444D/L
CIRCUIT DESCRIPTION
TERMINAL DESCRIPTION
Terminal Configuration (Top View)
aot [Jj 26
4c]
fT
CCt~—“‘CLSS
420 [ee DG:
43L Px)
440 sy)
450 uPD1708G-637-00 [2
46 CJ (TOP VIEW) [20
47 Pot—“;i‘*
480 TB
fo 17
p16
TS
P14
7 8 9
10 11 12 13
1
KS,
(PB,)
29
BANDZ/N.R
30
METAL-LOC
31 LOUDNESS
2
3
[Pin No.
este
p 2 |
| 3
a
is
20
ae
| 12 |
| 13 |
rie
ie
4
5
7
1
1
1
1
1
1
7
KS,/K, (PA,)
KS,/K, (PA,)
2
4
| 18 |
| 19
| 20 |
p24
| 23
KS, (PB,)
KS, (PB,)
* Not used.

Pin description
KRC-444D/L
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
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.
AF MUTE
Chip Enable
Crystal resonator
This pin is 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 ys or high level
signal is not accepted.
Connectors of the crystal resonator.
Connect the 4.5 MHz crystal resonator.
Mute Out
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 pinis 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 levet 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.

KRC-444D/
CIRCUIT DESCRIPTION
Symbol Pin Name
Description
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 level signal is output.
LOUDNESS Loudness Out
(CMOS output)
DOLBY output pin
When “DOLBY” is displayed on the LCD panel, high level signal is output. When it is not
lit, low level signal is output.
On initialization when the power is turned on, low level is 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 “0”, 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.
@ 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
0”
(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

KRC-444D/L
CIRCUIT DESCRIPTION
1. KEY MATRIX CONFIGURATION
1-1. Key Matrix Layout
KSg (28)
KSg (25)
KS, (20)
REeaN oN Ree N
SK
The SS in the SSS shows the pin no.
SS
LL] : Momentary switch SS : Diode matrix (closed/opened by diode)
SS
P
YZ : Alternate switch or transistor switch | : Open
LLL
1-2. Switch Connection 1-3. Key Matrix Connection
Momentary switch Alternate switch
Kn
uPD1708G-637-00 KSo
a
KSm KSm
Diode matrix or open Transistor switch
Vop
KSm—
el
: Momentary switch
i
: Alternate switch or
transistor switch
: Diode matrix
tk}

KRC-444D/L
CIRCUIT DESCRIPTION
2. KEY MATRIX DESCRIPTION (1) The switch for setting the receiving frequency range
and the channel spacing:
2-1. Diode Matrix for Initialization
The diode matrix for initialization has the following five Bane
status. All status is read out only when the power is sup- (2) Clock signal select switch:
plied to the Vpp for the first time (Power-ON, Reset) and CLKSEL
when the CE pin goes high from low level (CE Reset), in
; : : ae 3) Priori i i ;
another periods, the diode matrix status is ignored. (3) Priority select switch for display
PRIORITY
(4) —
(5) NR select switch:
NR SEL
(6) CLOCK/FREQUENCY select switch:
CLOCK/FRQ
(7) LW select switch:
BANDB
Function Description
This switch is used for setting the receiving frequency range for each FM/MW/LW band channel spacing. Each setting
status is as follows:
BAND A Frequency Range Channel Spacing Manual Step
0 87.5~108.0 MHz
522~1611 kHz
When the clock function is provided, this switch selects the priority mode for display.
When the display which does not have priority is recalled, the mode having priority will be displayed after approx.
PRIORITY 5 seconds.
“1: No priority
“O"': Priority is provided.
Select switch to provide the clock function or not.
CLKSEL “1 Clock is not provided (For back-up, RAM is not cleared)
| 0" Clock is provided.
Select switch to provide the NR (noise reduction) function.
“O"': NR is not provided (WIDE-ADV and BAND 2 output pin)
“41> NR provided
Select switch to provide priority to the clock or frequency for display (Depending on PRIORITY)
CLOCK/FRO “O": Frequency
“1: Clock
Switch to access the preset memory (M1 to M6) sequentially
“OQ”: M1 to M6 keys are preset independently
“1: Each time the M1 key is pressed, preset memory is sent sequentially
CoM Mey
11

KRC-444D/L
12
CIRCUIT DESCRIPTION
2-2. Mode Select Switches
Unlike the initializing switches, these switches can be
changed at any times. (On the following table, “1” shows
switched ON, “0” shows switched OFF.)
Function Description
Set the unit to RADIO mode or TAPE mode.
“1""” TAPE mode
“0”: RADIO mode
In the RADIO mode:
This is the Station Detector input in SEEK or SCAN mode.
This should be set to OFF within approx. 50 ms after the PLL is locked.
When every times are OFF by detecting the station every 1 ms, the station is recognized as received and the seeking or
scanning operation stops.
In the RADIO mode: (Only for FM reception)
Stereo signal input switch.
When this switch turns OFF, ’‘ST” is displayed on the LCD panel. However, “ST” goes off in the Auto Tuning mode (AF-
MUTE pin is active) even if this switch is OFF.
STEREO
In the Tape mode:
Tape running direction indicator input switch.
When this switch turns ON, the “REV” (4) is displayed on the LCD panel. When it turns OFF, the “FOW”’ (P) is displayed.
This switch functions only when the CE pinis high and the MODE switch is “ON” (Tape mode).
FOW/REV
2-3. Momentary Switches
These keys are used for manual tuning and time adjustment.
@ Frequency display
Each time the key is pressed, the displayed frequency is advanced up (by MU key) or down (by MD key) by 1 step
(channel spacing set). When it is pressed for a half second or more, the frequency is advanced rapidly (continuously)
until it is released.
@ Clock (time) display
While pressing the ME key, press the MD key to adjust the time, and press the MU key to adjust minutes.
In the Radio mode:
These keys are used to write or recall the preset memory.
FM, MW and LW bands can be stored independently into each key in memory.
(1) When writing
With the frequency display, within five seconds after pressing the ME key, press one key (M1 to M6), to store the fre-
quency currently received into memory.
(2) When recalling
When one key (M1 to M6) is pressed, the memory content (frequency) corresponding to the key pressed is recalled.
When the radio is turned on after the VDD is first turned on, the lowest frequency on the FM band is recalled. When
shipped, the following frequencies are preset into M1 to M6 key for adjustment at the factory.
Preset Memory Key
Range
87.9~107.9 MHz
87.50~108.00 MHz
530~1620 kHz
522~1611 kHz

KRC-444D/L
CIRCUIT DESCRIPTION
Function Description
Display select key. Available only when in the radio mode.
When this key is pressed, the display is changed from the clock display to frequency or vice versa. However, five seconds after
the key is pressed, the display is restored to the priority mode (depending on the diode matrix PRIORITY).
When the clock is not provided (CLKSEL=0), this key has no effect.
However, the clock display is resumed by the PRIORITY switch when the display priority is provided.
a) ON: Priority is provided
b) OFF: No priority
(1) NR key (RADIO/TAPE common key)
(2) WIDE-ADV key (Independent RADIO/TAPE key)
(1) NR key:
BAND A: “0”, "1"
NR SEL: “1'' With the above status, this key is used as the NR select key.
Each time the key is pressed, the BAND2/NR output pin and ‘‘NR”’ display on the LCD panel are inverted. When “NR” is
displayed on the LCD panel, the BAND2/NR pin outputs the high level, and when the display is not lit, low level is output.
(By initialization when the power is turned on, it outputs low level.)
(2) WIDE-ADV key:
BAND A: 0", "1"
NR SEL: “1”
With the above status, this key is used as the WIDE-ADV select key.
In the Radio mode:
Used as the WIDE select key.
Each time the key is pressed, the BAND2/ADV output pin and the ‘‘WIDE” display on the LCD panel are inverted. When the
“WIDE” is displayed on the LCD panel, the BAND2/ADV pin outputs the high level, and when the display is not lit, low level is
output.
On Tape mode:
Used as the ADV select key.
Each time the key is pressed, the BAND2/NR output pin and the “ADV” display on the LCD panel are inverted. When the
“ADV" is displayed on the LCD panel, the BAND2/NR pin outputs the high level. When the display is not lit, the low level is
output.
(By initialization when the power is turned on, low level is output.)
Note:
When the following status is selected in the diode matrix, the NR key and the WIDE-ADV key are not effective.
NR SEL: “0”
BAND A: “0”
BAND B: “1”
M5 BAND
This key is used for setting the received frequency range for FM/MW/LW band and the channel spacing.
1. By initialization when the power is turned on, the receiving frequency and channel spacing are registered by the diode of
BAND A.
ager
Then, when the CE pin goes-L"’—"’H“or vice versa, they follow the diode of BAND A.
2. When the CE pin is inverted to high from low while pressing the M5 key and the BAND key together, the band setting of
BAND A is changed from ‘'1”' to ‘‘O”’ or from “0” to “1”
Then, when the CE pin is inverted to-*L'’—“’H’sor vice versa, the changed area setting is maintained.
. When the CE pin is inverted from low to high while pressing the M5 key and BAND key together, the band setting follows
the diode of BAND A.
Then, when the CE pin is inverted from+L"’—*'H“4or vice versa, it follows the diode of BAND A, too.
. To change the setting by the M5 key and the BAND key, repeat procedure 2 and 3.
Note:
On initialization when the power is turned on, the M5 key and the BAND key are ignored even when they are pressed, and the
setting is followed to the diode.
13

KRC-444D/L
14
CIRCUIT DESCRIPTION
Function Description
These keys are used to write and recall the preset memory.
Each FM, MW and LW frequency can be stored into one key in memory independently.
However, the number of available bands differ with the area designated by the initializing diode matrix, as follows:
For the area only 2 bands are available: 6 stations X 2 = 12 stations
For the area 3 bands are available: 6 stations X 3 = 18 stations
Corresponding to the preset key pressed, the “‘CH" indicator and‘’ =’ (channel number) are displayed on the LCD panel.
These keys are used for automatic tuning. During auto tuning operation, when the SD switch is turned OFF, the frequency
displayed at the time is kept on hold.
In auto tuning mode, the auto tuning operation is continued even when the LOUDNESS, ME, NR, METAL-DX/LOC, or
MONO-DOLBY key is pressed.
When one of the other keys is pressed, the auto tuning operation is stopped, and the unit enters the operation of the key
pressed.
When the SEEK key is pressed again, the frequency before the SEEK operation is resumed.
SEEK UP/DOWN
This key is used to select the function between DX/LOC — MTL.
@ Inthe Radio mode:
Each time the key is pressed, the LOC output pin and the “‘LOC”’ display on the LCD panel are inverted. When the “LOC”
display on the LCD panel, high level signal is output from the LOC Out pin, and when it is not lit, low level is output.
@ Inthe Tape mode:
Each time the key is pressed, the LOC output pin and the ‘’MTL"’ display are inverted
When the ‘’MTL” is displayed on the LCD panel, low level signal is output from the LCD Out pin, and when it is not lit, high
level is output.
By initialization when the power is turned on, high level signal is output.
DX/LOC
—MTL
This key is used for writing the preset memory. It is also used for adjusting the time on clock display.
@ Frequency display:
Used when writing a new frequency into the preset memory. When this key is pressed, the ‘’ME”’ is displayed on the LCD
panel, and lit for five seconds after the key is released. While the ‘‘ME” is lit, pressing one key (M1 to M6) stores the
displayed frequency into memory corresponding to the key pressed.
To cancel the preset memory, while the ‘‘ME” is lit, press any key other than ME, NE, METAL-DX/LOC, MONO-DOLBY, or
LOUDNESS.
@ Clock display:
The ‘‘hour” and “‘minutes”’ can be adjusted by pressing the MD or MU key while pressing the ME key.
After pressing the ME key, each time the MD key is pressed, the ‘‘hour’’ is advanced one by one. Pressing it for a half second
or more advances the time by 4 hours/sec continuously until the MD key is released. This operation does not affect the
“minute” or “second” digits (they are not displayed during this operation).
After pressing the ME key, each time the MU key is pressed, the ‘‘minute’’ is advanced one by one. Press it for a half second
or more advances the minute in 8 minutes/sec speeds continuously, until the MU key is released. The “second” is not
displayed, however, it is reset to zero every time the “minute” is set. The ‘‘minute” adjusting does not affect the ‘hour’.
(Hour” is not changed even when the “‘minute’’ exceeds 60.)
(During clock display, pressing the ME key alone changes the display to frequency and ‘‘ME” is displayed. In this condition,
pressing one of the preset keys (M1 to M6) stores the frequency into the memory corresponding to the key pressed.)
This key is used to select the band.
When Band A is “0” or ‘1°’ and Band B is ‘’O”’ (LW: Not available) . ..
Each time this key is pressed, the band is changed in the order of FM — MW — FM...
Used for Loudness select key.
Each time this key is pressed, the loudness output pin and the ‘“‘LOUD” display on the LCD panel are inverted. When the “LOUD”
is displayed on the LCD panel, low level signal is output from the Loudness pin and when it is not lit, high level is output.
By initialization when the power is first turned on (rising time of VDD), “LOUD” is displayed and low level is output.
LOUDNESS

KRC-444D/L
CLASSIFICATION OF CHIP PARTS
Digital
transistor/F2h>
|
Symbol/i28
}
Rt
|
R2
|
DTA/DTC114EK
DTA/DTC114YK
DTA/DTC114TK
Symbol BS
2SA1036K
2SA1037K
2S8C2411K
Diode/¥44—KF
DAN202K_Silver/Jb-<
DTA/DTC124EK
2SC2412K
DTA/DTC124XK
2S8C2413K
DTA/DTC143EK
2SC2059
K
.
OTA/DTC143TK
2SC3082K
Boer
a
es.
DTA/DTC144EK
2SB852K
DTA/DTC144WK
2SD1383K
becnrpowooantntter >
DTA/DTC143XK
2SD1757K
28D1328
2SC2412LN
- 35
hee
39~ 82
56~ 120
82~ 180
120~ 270
180~ 390
270~ 560 2SA1036K
390~ 820 hFE 82~180
> 560~1200
: 1000~
: 5000~
R1
R2
DTA124EK
DrRPCMHMND OHO VTZe2
15

KRC-444D/L
16
Set the controls and switches as follows.
BALANCE
FADER
BASS
TREBLE
scenter position
:center position
:center position
scenter position
MINATOR
LOUD
T+ ADY
METAL
DOLBY NR
INPUT
SETTINGS
CAD
98.1 MHz
0 dev
60dBCANT input)
[OFF
:OFF
:OFF
:OFF
ADJUSTMENT
ATT
AUTO
OUTPUT
SETTINGS
Connect a DC
voltmeter
to TPL.
(X05 -318)
: OFF
OFF
RECEIVER
SETTINGS
PM
98. 1MHz
ALIGNMENT
POINTS
Tl
(X05 -318)
ALIGN FOR
OP LEVEL
(A)
98. 1MHz
kHz,+40kHz dev
20dBCANT input)
FM
SEEK: ON
98. MHz
VR2
(X05 -318)
(C)
98. 1 MHz
kHz,+40kHz dev
Selector:L or R
Pilot:6kHz dev
60dBCANT input)
VR3
(X05 318)
Maximum separation.
Best point |
|
IF GAIN
(C)
98. 1MHz
kHz,+40kHz dev
Pilot:2+6kHz dev
| 80dBCANT input)
VRI
(X05 -318)
Separation
10dB
| SOFT MUTE LEVEL
(A)
98. 1MHz
LkHz,240kHz2 dev
60dB—No input
SEPARATION
CC)
98. 1MHz
1kHz,+40kHz dev
Selector:L or R
Pilot :26kHz dev
60dBCANT input)
VRS
(X05-318)
Output Noise level
-25dB
(When not add any signal
to ANT terminal)
VR6
(X05 -318)
Minimum crosstalk
A compromise adjustment
may be required if
left-to-right and
right-to-left separations
PILOT
CANCELLER
()
98. i MHz
Q dev
Pilot:2+6kHz dev
60dBCANT input)
(B)
VR?
(X05 -318)
are unequal.
Minimum output
DK
SENSITIVITY
(CE)
98. 1MHz
1kHz,+40kHz dev
SK,5.33% mod
DK,380% mod
60dBCANT input)
Connect
an AC
voltmeter
to TPL
(X13 -543)
98. 1 MHz
SDK: OFF
VRI
(X13-548)
17m¥ AC

INPUT
SETTINGS
ADJUSTMENT
OUTPUT
SETTINGS
Connect a |
RECEIVER
SETTINGS
ALIGNMENT
POINTS
KRC-444D/L
ALIGN FOR
999kHz | AM VR4
<1> STOP LEVEL 400Hz,30% mod Fs AUTO: ON (X14 -195) STOP
35dBC(ANT input) | | 990kHz
|
| frequency FM
C1) | DK ¥CO DK SW OFF counter to 98. 1 MHz VR2 125Hz (ce)
| BK S¥ OFF TPS. SDK: ON (X13-548) |
: - ; (X18 -543) ese
| | @)
| 98. i1MHz
(2) 1 SK LAMP : 1kHz, SK SW ON : (B) FM VR3 Adjust so that the SK
BK S¥ ON | 98.1MHz | (X14-195) LAMP just lights.
aunts = | 204BCANT input) | ee | _
| | (EB)
| 98, 1MHz FM
LkHz,+40kHz dev 98. 1MHz VR2
(3) DK LEVEL $K,5.338% mod (B) VOLUME: 0 (X14-195) 400m
DK,30% BK, 60% mod SDK: ON
S0dBCANT input)
(D)
AS SETTE D Be CK SECTION
Adjust so
and
that the output
identical.
Head levels of the forward and
AZIMUTH MTT-216 (B) TAPE PLAY Azimuth reverse left and right (d)
(10kHz) Screw channels are all maximum
17

KRC-444D/L
REGLAGE
Régler les controles et les boutons comme suit.
BALANCE
' FDER
BASS
TREBLE
CT ION MF
‘position centre
:position centre
:position centre
:position centre
TEM
DISCRIMINATEUR
LOUD OFF ATT
T+ ADY :OFF AUOT
METAL OFF
DOLBY NR :OFF
REGLAGE DE
L’ ENTREE
(A)
98, 1 MHz
Odév
60dBCEntrée ANT)
| NEVEAU DE
CHERCHER D’ ARRET
i REGLAGE DE
‘ LA SORTIE
Connecter un
voltmétre CC
entre a TP1.
(405-318)
: OFF
: OFF
REGLAGE DU TUNER
CAMPL I -TUNER)
FM
98, 1MHz
POINTS DE
L’ ALIGNEMENT
Tl
(X05-318)
ALIGNER POUR
(A)
98, IMHz
1kHz.+40kHz dév
20dBCEntrée ANT)
FM
CHERCHER:
98, LkHz
VR2
(X05-318)
(C)
98, 1MHz
1kHz.#40kHz dév
Selecteur: L ou R
Pilote:+6kHz dév
60dBCEntrée ANT)
PM
98, 1 MHz
VR3
(X05-318)
Séparation maximale.
Punkt meilleur |
GAIN FI
NIVEAU DE
SOFT MUTE
(€)
98, IMHz
1kHz.+40dB dév
Pilote:+kHz dév
| 80dB(Entrée ANT)
PM
98, 1MHz
VR1
(X05-318)
Séparation
10dB
CA)
98, 1MHz
1kHz.+40kHz dév
60dB>Entrée No
PM
98, 1 MHz
VRO
(X05-318)
Bruit de niveau de sortie
-25dB
(Sous non correspondance
d’ antenne, )
SEPARATION
(C)
98, IMHz
1kHz.+40kHz dév
Selecteur:G ou D
Pilote:+6kHz dév
B0dBCEntrée ANT) |
VR6
(X05-318)
Diaphone minimale.
Un compromis de réglage
peut étre nécessaire si les
séparations de gauche a
droite et de droite a gauche
sont inégales.
SUPPRESSION
DE SIGNAL
PILOTE
(C)
98, MHz
Odév
Pilote:t+6kHz dév
60dBCEntrée ANT)
(B)
oe) Benes
FM
98, LHHz
VR7
(X05-318)
Sortie minimale
18
SENSIBILITE DK
(CE)
98, 1MHz
1kHz.240kHz dév
SK,5.33% mod
DK,30% mod
60dBCEntrée ANT)
Connecter un
voltmétre AC
entre a TPl.
(X18-543)
$8, 1MHz
SDK: OFF
VRI
(X18-543)
AC 17mV
Pe sige

ITEM
CTION SDK
REGLAGE DE
L’ ENTREE
OFF DK S¥
OFF BK S¥
REGLAGE
REGLAGE DE
LA SORTIE
Connecter un
compteur de
Fréquence a TP3.
_ 13-543)
REGLAGE DU TUNER
CAMPLI -TUNER)
FM
98, 1MHz
SDK :ON
POINTS DE
L’ ALIGNEMENT
VR2
(X13 -543)
KRC-444D/
ALIGNER POUR
SK COIL
|
(E)
98, [MHz
ON SK S¥
ON BK S¥
20dBCEntrée ANT)
1kHz
(B)
FM
98, 1 MHz
VR3
(X14-195)
Régler de facon que
le voyant accordé s’ allnme.
NIVEAU DE DK
CTION MA
i NIVEAU
<>} D’ ARRET
SECTION DU
AZIMUTH
1
i
|
{
|
|
|
|
|
(E)
98, IMHz
LkHz.240kHz dév
SK.5,338% mod
DK.30% BK.60%mod |
60dBCEntrée ANT) |
i
1
999kHz
400Hz. 30% mod
$5dBCEntrée ANT)
MAGNETPHON
MTT -216Ci0kHz)
FM
98, MHz
VOLUME: 0
SDK: ON
MA
AUTO: ON
990kHz
Lecture de
bande
VR2
(X14-195)
VRA
(X14 -195)
Vis d’ azimut de
téte
Régler en sorte que les
de l’avance de gauch et de
droite et des canaux mar-
chearriére de gauch et de
droite soient tous au
maximum et identiques.
niveaux de sortie des canaux |
19

KRC-444D/L.
20
Die Regler und Knipfe wire folgt einstellen.
ABGLEICH
BALANCE :Mittelage LOUD : OFF ATT : OFF
FADER :Mittelage T+ ADY : OFF AUTO : OFF
BASS :Mittelage METAL : OFF
TREBLE :Mittelage DOLBY NR :OFF
EINGANGS- AUSGANGS- TUNER CRECEI YER) - ABGLEICH
NR. GEGENSTAND EINSTELLUNG EINSTELLUNG EINSTELLUNG PUNKTE ABGLEICHEN FUR ' ABB.
W-ABTEILUNG
Einen Gleich-
CA) spannungsmesser
l DISKRIMINATOR 98, 1 MHz zwischen zu TP1 FH Tl Ov (a)
0 Hub anschlieBen. 98, MHz (X05 -318)
60dBCANT-Eingang) (X05 -818) - ; - ;
(A)
2 SUCHEN HALT 98, MHz FM VR2
PEGEL LkHz.+40kHz Hub - SUCHEN: ON (X05-318) HALT
20dBCANT-Eingang) g8,IMHz | L ee
(C) !
98, MHz Maximaler trennung. |
Lkiiz.240kHz Hub FH YR3 |
3 ANRC Wahler:L oder R (B) 98, 1MHz (X05 -818)
Pilot:+6kHz Hub
| 60dBCANT-Eingang) 7 ee = Bestes point |
(C) |
98, 1MHz |
4 IF VERSTARKUNG 1kHz.240kHz Hub (B) FM YR1 Trennung 10dB
Pilot:26kHz Hub 98, MHz (X05 -318)
A
a
30dBCANT-Eingang)
-
7
Dest
ee
-
(A) | Ausgang Gerausch Pegel
98, 1 MHz FM VRO -25dB i
Dd | SOFT MUTE PRGEL lkHz.+40kHz Hub (B) 98, 1MRz (X05 -318) (Wenn Antenna stecker Nicht |
60dB>No Eingang 2 aes anschlieBen. )
(C) | Minimales Ubersprechen
98, 1MHz Einen Ausgleichrege lung
6 STEREO KANAL 1kHz.240kHz Hub FM VR6 kann notwendig sein, falls
TRENNUNG Wahler:L oder R (B) 98, {MHz (X05 -318) links zu rechts und rechts -
Pilot:+6kHz Hub zu links Trennungen
60dB(ANT-Eingang) - ungleich sind,
(C)
98, 1 MHz
7
PILOT
LOSCHER
0
Hub
(B)
FM
VR7
Minimal
Ausgang
Pilot:26kHz Hub 98, {MHz (X05 -318)
60dBCANT-Eingang) 5 4 |
(E) |
98, [MHz Einen Gleich- |
DK tkHz.240kHz Hub spannungsmesser 98, 1 MHz VRI |
8 EMPFINDLICHKEIT SK.5,33% mod zu TPL SDK: OFF (X13 -543) L7mV AC l (b)
DK.30% mod anschlieBen. |
60dBCANT~Eingang)
(X13-543)
|
‘a