Kenwood KR-V77R User manual

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SERVICE MANUAL
©1988-6 PRINTED IN JAPAN
B51-3569-00 (0) 1648
Slide switch (POWER) Front glass Metallic cabinet Knob ass‘y
(S40-1064-05) (B10-0962-03) (A01-1650-01) (K29-3253-04)
Knob (GE) Panel Knob (SEL)
(K29-2994-03) (A20-5535-02) (K29-2995-03)
KENIWOOD auon-vine|} ovens mucaiven Knevern
REARS AT a we
Phone jack (PHONES) Knob (GE) Escutcheon Knob (SEL) Remote controller ass'y*
(E11-0162-05) (K29-2993-03) (BO7-1815-04) (K29-2996-03) (A70-)
Knob (SPEAKERS) Foot Knob (MATRIX SURROUND) Dressing plate
({K27-1304-04)x2 (JO2-01 70-04) x4 (K29-2999-04) ‘ (BO3-2451-04)
Slide switch* Miniature phone jack (SYSTEM) AC outlet*
($31-2072-05) {E11-0165-05) (E03-0086-05)
Screw terminal
board (2P) ANT Binding post Phono jack Lock terminal board (8P) SPEAKER Slide switch (Power type) AC*
({E20-0318-05) (NO8-01 28-35) (E13-0487-05) (£20-0823-05) ($31-2128-05)
Puxtaid
Phono jack (8P) TAPE1,2 Lock terminal board (SURROUND SP) AC power cord*
(E13-0820-05) (€20-0475-05) _ (E30-)
Phono jack (6P) PHONO,CD,AUX Phono jack (6P) VIDEO1,2 Slide switch Power cord bushing
(E13-0621-05) {E13-0621-05) (IMPEDANCE SELECTOR) (J42-0083-05)
($31-2136-05)
* Refer to parts list on page 51.

KR-V77R
CONTENTS/CONTROLS
AND
INDICATORS
CONTENTS
|
CONTROLS
AND
INDICATORS
......--.--0-0005
2
DISASSEMBLY
FOR
REPAIR
..........-.-
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14
BLOCK
LEVEL
DIAGRAM
........--0+20+-055
15
CIRCUIT
DESCRIPTION
Description
of
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Microprocessor : uPD75108CW-170 or -200
(X14-2320-11
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ADJUSTMENT
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24
REGLAGE
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CONTROLS
AND
INDICATORS
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ABGLEICH .. 1... cee ce ee ee eee eee 26
ADJUSTMENT/REGLAGE/ABGLEICH............ 27
VOLTAGE CHECK TABLE .......-.-0+2+2-0>- 28
PC BOARD (COMPONENT SIDE VIEW) .......-.. 29
PC BOARD (FOIL SIDE VIEW) ......22 0-000 eee 33
CIRCUIT DIAGRAM ..... cusgre fata: Sinvace.eSeite: 0 Waar 37
EXPLODED VIEW ... 2... cece eet ee eee 49
PARTS LIST 2.1.0... eee eee et ene ene nee 51
SPECIFICATIONS ........50-02005 BACK COVER
Saar,
KR-V77R
@ POWER switch
Press
this
switch
to
turn
on
power.
Press
it
again
to
turn
power off.
@ SPEAKERS A and B switches
A,B
OFF
-
This
position
silences
all
speakers
to
permit
private
use
of
headphones.
A
ON
-
Activates
speakers
connected
to
the
SPEAKERS
A
terminals
on
the
rear
panel.
B
ON
-
Activates
speakers
connected
to
the
SPEAKERS
B
terminals
on
the
rear
panel.
A,B
ON
-
Activates
speakers
connected
to
the
SPEAK-
ERS
A
and
B
terminals
simultaneously.
Note:
——_—_____________-_____—-
When
the
SPEAKERS
A
and
B
switches
are
used
at
the
same
time,
the
speakers
connected
to
the
SPEAKERS
A
and
B
terminals
are
connected
in
series.
In
this
respect,
whenever
using
the
SPEAK-
ERS
A
and
B
switches
at
the
same
time,
be
sure
that
two
pairs
of
speakers
are
connected
to
the
terminals
A
and
B,
otherwise
no
sound is output.
© PHONES jack
Stereo
headphones
are
plugged
into
this
jack.
© EQ (Equalizer) PRESET keys
Use
these
keys
to
store
equalizer
curves
in
memory
or
to
‘recall them.
PGM:
User-adjusted
equalizer
curves
can
be
programmed
as
desired
and
stored
in
memory:
up
to
five
patterns.
SET:
Five
factory-preset
equalizer
curves
are
stored
in
memory.
Up
to
10
equalizer curve
memories
are
available
in
total.
Press
the
PGM/SET
key
to
select
either
the
user-
programmed
pattern
or
the
factory-preset
pattern.
© Equalizer level controls
Adjust
these
controls
up
and
down
to
equalize
the
sound
by +12 dB to the center frequency indicated.
@ Equalizer function keys
@ Equalizer preset mode key (PGM/SET)
Each
time
this
key
is
pressed,
the
recall
mode
of
the
equalizer
preset
curves
alternates
between
PGM
(user
programmed
patterns)
and
SET
(factory
preset
patterns).

CONTROLS AND INDICATORS
@ Equalizer preset MEMORY key
This key is used to store an equalizer curve into the PGM
PRESET memories. First, select the desired equalizer curve
and then press this key. Then press any of the PRESET (A
to E) keys. The selected equalizer curve will be stored in
the memory indicated by the PRESET key pressed.
@ Equalizer (EQ, ON) key
Press this switch to ON and the frequency characteristic
will be modified by passing through the graphic equalizer.
In the DEFEAT position, the frequency characteristic
remains unchanged.
@ EQ REC key
Used when recording the source onto the tape’ deck
through the equalized response of the graphic equalizer.
@ System memory keys
@ SYSTEM MEMORY channel key (M-1/M-2)
Two groups of memory can be used with the preset
channel key of the System Memory system. After entering
the memory preset mode by pressing the SYSTEM MEMO-
RY key, press the M-1 or M-2 key.
@ System MEMORY key
This key is used to store the currently playing condition in
memory.
© DOLBY SURROUND key
Press this key to activate or deactivate the surround output.
In the KR-V77R, MATRIX surround mode is automatically
entered when this key is pressed.
With the KR-V77R, when the speaker selector switch at
the rear is set to 80. OR MORE, the surround mode cannot
be obtained.
© Input selector switches
TAPE 1-Press this switch to play back a tape deck
connected to the TAPE 1 jacks.
TAPE 2/MONITOR - Press this switch to play back a tape
deck connected to the TAPE 2 jacks. (The TAPE 2 switch
is Operated in priority to any other audio input systems.)
VIDEO 1 - Selects the video recorders connected to the
VIDEO 1 jacks. :
VIDEO 2-Select the video recorders connected to the
VIDEO 2 jacks.
CD - Selects the source connected the CD jacks.
PHONO -Selects the program source played on the
turntable.
TUNER - Selects the tuner mode.
AUX - Selects the source connected the AUX jacks.
@ AUDIO INJECTION key
Press this key ON when replacing the sound of VIDEO 2
with that of AUDIO source is required on dubbing between
VIDEO sources.
KR-V77F
@® MUTING key
When the muting key is pressed, the MUTING indicator in
the display window will.flash, and the overall listening
sound level is reduced.
When the key is pressed again. you can restore exactly the
same listening level as before.
@ REMOTE SENSOR
Point the supplied remote control unit towards this sensor
and operate.
@® REMOTE POWER STAND BY indicator
This indicator lights so far as the power cord is plugged
into the AC outlet. It is lit to show that the POWER switch
on the front panel or the POWER key on the remote control
unit can be activated.
@® BALANCE contro! key
Governs the amount of sound coming from each paired
speakers to get optimum stereo effect. Pressing the RIGHT
key will decrease the left channel volume and pressing the
LEFT key will decrease the right channel volume. When the
BALANCE controls is pressed, display window shows the
BALANCE indicator.
@ MAIN VOLUME control key
This contro! adjusts the left- and right-channel volumes
simultaneously. Set it for the desired listening level.
Pressing the up (A) side increases the volume and pressing
the down (V) side decreases it.
Indicator (A) or (V) blinks when this unit is operated
directly or with the remote control unit.
The volume level of the rear speakers are controlled at the
same time.
@ Band selector switches
FM - For FM broadcasts.
AWMi - For AM broadcasts.
@® Numeric (1 ~ 0/10) keys
Use these keys to:
1) input directly the digits of frequencies, or
2) store and recall frequencies in the preset channel.
@ Tunning function keys
@ DIGIT key
In the station name input mode, pressing this key advances
the column after selecting the character with the Tuning
UP/DOWN key. When this operation is repeated four time,
the station name input mode will be released automatically.
@ CHARACTER key
Press this key to activate the station name input mode.

KR-V77R
CONTROLS AND INDICATORS
@ PRESET SCAN key
Use this key for preset channel scanning.
When a frequency stored in the preset memory is being
received, pressing this key shifts the reception to the next
frequency stored in the preset memory. (The preset
channels are scanned in the order 1, 2...... 11,12... 20,)
To stop a scanning operation, press the SCAN key again.
@ MEMORY key
When the input mode is TUNER, use this key to store new
broadcast station data in the preset channel memory. By
pressing the MEMORY key, setting the preset channel to
1-10 or 11-20 and by pressing one of the numeric keys,
the frequency being received is stored in the memory in
the numeric key pressed.
@ DIRECT key
Used to tune to the station directly. Input the desired
frequency numerics with the numeric keys after pressing
the DIRECT key.
@ Preset function (1-10/11-20) key
Used to select 1-10 or 11-20 setting for the preset
channel. In either FM or AM mode, 20 stations can be
preset as random as each setting (1-10" or 11-20") can
contain 10 preset stations. indicator “1-10” lights when
“1-10” setting is used, and indicator “11-20” lights when
“41-20” setting is used.
@ AUTO/MANUAL (MONO) key
When this key is pressed, the AUTO indicator will light. The
frequency will automatically stop at a station in automatic
tuning mode. When a stereo broadcast is received, the
output sound is automatically changed to stereo.
@ TUNING keys
Used to change the frequency. Pressing UP side will
advance to the higher frequency and pressing DOWN side
to the lower frequency.
In the station name input mode, this key is used to select
the character.
@® Display window
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@ In graphic equalizer mode, displays the equalizer level
display, the music spectrum analyzer display and peak
hold display.
@ Displays when storing or recalling equalizer preset
channel in memory.
@® Lights when the Memory (EQ) key is pressed to store
the desired equalizer curve.
(@ Lights when the TAPE-2 key is pressed.
@ VIDEO monitor out indicator.
© Lights when the AUDIO INJECTION key is pressed.
@ This displays the input mode, preset channel, station
name, front volume level, rear level, balance, DOLBY
surround (KR-V87R), EQ preset channel, SPI level
(KR-V87R), system memory indicator.
“1-10"or “11-20” lights according to the selection of
the preset function keys.
@) Front volume level indicator
This indicator displays the volume level for the front-
channel speakers. ,
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VOLUME
LEVEL
@® Rear volume level indicator (KR-V87R)
The volume level of the rear-channel speakers is indicat-
ed within a + 20 dB range.
@ Flashes when the MUTING key is pressed.
@ Displays the digital frequency display.
@ Displays the tuner band “FM” or “AM”
In tuner mode, lights when a stereo broadcast is tuned
in.
@ In tuner mode, lights when a station is tuned in.
Lights during auto tuning.
@ Lights when the MEMORY key is pressed.
@ This indicator lights when EQ REC (equalizer recording)
key is pressed.
Lights when the Equalizer (EQ. ON) key is set to “ON”.
Lights when the Equalizer (EQ.. ON) key is set to
“DEFEAT”.
@ Lights when the Equalizer preset mode (PGM/SET) key
is set to “PGM”.
‘@ Lights when the Equalizer preset mode (PGM/SET) key
is set to “SET”.

CONTROLS AND INDICATORS
@ Listening to AM/FM
1. Press the Power switch to ON.
2. Press the TUNER key of the input selector.
3. Select FM or AM of the band (FM/AM) selector.
4. Tune to the required station with following proce-
dures: Auto tuning, Manual tuning or Direct tuning.
Auto tuning
1. Press the AUTO/MANUAL (MONO) key to set to
“AUTO”.
2. Press the UP or DOWN TUNING key: The frequency will
automatically increase or decrease until a station with
sufficient signal level is received. To stop the frequency
scanning before a station is received, press the
AUTO/MANUAL key to set to “MANUAL”.
3. Adjust the VOLUME control to the required listening
level and use the graphic equalizer control to adjust the
sound to your own preference.
Manual tuning
1. Press the AUTO/MANUAL (MONO) key to set to
“MANUAL”.
2. Press the UP/DOWN TUNING key to tune in the desired
Station.
To continuously increase or decrease frequencies, hold
the TUNNING key depressed.
3. Adjust the VOLUME control to the required listening
level and use the graphic equalizer control to adjust the
sound to your own preference.
Direct tuning
1. Select FM or AM with the FM, AM selector switch.
2. Press the DIRECT key.
3. Input the desired frequency with numeric keys.
4, The receiver enters the radio reception mode just after
the frequency value has been input.
(If the input value is outside the tuning range, the
frequency display flashes for 5 seconds and the receiver
returns to the radio reception mode of the last channel.)
@ Presetting broadcast station data
In total up to 20 stations data (station frequency and
station name) can be stored in memory.
1. Select the desired station with either AUTO tuning,
MANUAL tuning or DIRECT tuning.
2. Input the broadcast station name in accordance with
the character input procedure.
For the broadcast station names, up to 4 characters can
be input.
@ When the contents in item 2 is not required for display
memory. proceed to item 3 after item 1.
3. Press the preset function key to select 1-10" or
“14-20”.
4. Press the MEMORY key. (The MEMORY indicator
lights.)
5. Press one of the numeric keys: The frequency being
tuned in and the station name are stored.
Character input procedure
1. Press the CHARACTER button to set the character
input mode. The first column of the character display
section begins flashing.
2. Press the TUNING UP/DOWN key to select the
character.
3. When the desired character is displayed, press the
DIGIT key.
Flashing will shift to the next column.
4. Repeat procedure 3 and 4 for four times to complete
inputting. The character input mode will be released.
@ Even in the middle of inputting. pressing the CHARAC-
TER key again will release the character input mode. At
this time, the data which has been input is valid.
Example 1: To preset the 91.50 MHz FM broadcast
and a station name “W N Y” when the
station other than the preset channel
memories is received.
1. Tune to 91.50 MHz FM broadcast.
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2. Press the CHARACTER key.
3. Press the TUNING UP key twenty-three time to select
Wy"
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