Harman Kardon AVR20MKII User manual

The Harman Kardon
Model AVR20MKII
AUDIO AND VIDEO RECEIVER
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harman/kardon AVR 2011
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=a CONTENTS &
SPECIFICATIONS «100s ceconeseeseteneverseseceeseeeesvees 2 GENERAL UNIT cessseccccscesene recent eeteeeaeeeeeuen ens 21
LEAKAGE TEST +4 PRINTED CIRCUIT BOARDS - 22
BLOCK DIAGRAM ----+-------2220808+ +5 ELECTRICAL PARTS LIST «+++++++++++ 23
CONTROLS AND FUNCTIONS -- --6 IC FUNCTIONAL BLOCK DIAGRAM 28
DISASSEMBLY PROCEDURES ::-- 7 WIRING DIAGRAM eve eee eee ere re reese +33
CIRCUIT DESCRIPTION --------- oe SCHEMATIC DIAGRAMS (I) ----+ 34
ALIGNMENT PROCEDURES oe 14 SCHEMATIC DIAGRAMS (II) «+ +35
TROUBLESHOOTING «+++ “+ 17 SCHEMATIC DIAGRAMS {IID --- +36
GENERAL UNIT PARTS LIST --+++-+--+++ese2eeeeee 2 20 SCHEMATIC DIAGRAMS [{IV) ------seeereeseeer terres 37
harman/kardon
Parts and Service Office
80 Crossways Park West, Woodbury, N.Y, 11797
1112-AVR20MKII G9604 1200 Printed in Korea

SPECIFICATIONS
@
RMS Output Power
(STERE MODE), Input: CD
THD: 0.09%, 8 chms
Both Channel Driven (40 Hz - 10 kHz)
(SURROUND MODE)
THD; 0.09%, 8 ahms, 1 kHz
THD (40 Hz - 10 kHz) at 63 W, 8 ohms, Input: CD
26S WwW
2ShW
40 kHz 50.06%
4 kHz 0.06%
10 kHz <0.06%
IM Distortion at 63 W, 8 ohms, Input: CD
60:7000 Hz = 4:1 0.2%
input Sensitivity
PHONO (MM) 2.5 mv
CD, AUX, VCR 150 mV
S/N Ratio Input Shorted at Volume Max. (WTD IHF-A)
PHONO 274 dB
CD, TAPE 1,2 292 dB
TV, VCR1,2 282 dB
Phono Overload at 1 kHz, THD: 0.5%
Phono input—- Tape Output > 140 mv
Phono Equalization (RIAA 30 Hz - 18 kHz)
Tape Monitor Output RIAA
Tone Control
Bass; 100 Hz +10dB
-10dB
Treble: 10 kHz +10 dB
-10dB
Loudness Contour at -40 dB
100 Hz +6 dB
10 kHz +3 dB
Frequency Response (CD/AUX)
20 Hz, 20 kHz + 0.5 dB
Channel Crosstalk Input Shorted
1 kHz 2 60 dB
10 kHz 250 dB
263Ww
250W
0.09%
<0,09%
<0,09%
50,3%
2.5+0.4 mV
150 4 30 mV
270 dB
290 dB
280 dB
2130 mV
RIAA 4 1.5 dB
+1042.0 dB
-10 42,0 dB
+104 2.0 dB
-10 42.0 4B
+64 2.0 dB
+3420 dB
+108
2 50 dB
> 40 dB
RMS Output Power
THD (0.3%, 8 ohms, 1 kHz)
Only Center Channel Driven 255 W
S/N Ratio (Input Level: 350 mV)
Input Shorted, IHF-A WTD 2 67 dB
Frequency Response at -3 dB
Normal
Wide 20 Hz - 20 kHz
BE
Nominal
RMS Output Power
THD (0.7%, 8 ohms, 1 kHz)
Only Rear Channel Driven 2S55W
S/N Ratio (Input Shorted, IHF-A WTD)
Delay: 20 ms, Input Level: 350 mV
Dolby >» 60dB
Hall = 60 dB
Frequency Response at -3 dB
8 ohms, Dolby Pro-Logic 80 Hz - 7 kHz
250W
265 dB
100 Hz - 20 kHz 150 Hz - 15 kHz
50 Hz - 15 kHz
Limit
2S0W
265 dB
255 dB
100 Hz - 6 kHz
Nominal
Input Sensitivity/Impedance
VCR1, VCR2, VDP 1 Vpp/75
Output Level/Impedance
VCR1, REC out, TV Monitor out
1Vep/75 O
Frequency Response at -3 dB DC-10 MHz
Crosstalk at 1.0 MHz 245 dB
Limit
+1 0B
+106
5-6 MHZ
240 dB
Tuning Gover Range
USA/Canada: 75 kHz DIV.
Europe: 40 kHz DIV.
Usable Sensitivity (75 ohms Input)
USA/Canada: 30 dB S/N
Europe: 26 dB S/N
Image Rejection (at 106 MHz)
USA/Canada
Europe
IF Rejection (at 99 MHz)
Full Limiting (at -3 dB)
87.5 - 107.9 MHz
87.5 - 108.0 MHz
50 dB Quieting Sensitivity (at 98.1 MHz, 100% MOD.)
IHF Band Pass Fitter
Mono
Stereo: USA/Canada
Europe
Distortion (1 kHz, 190% MOD. at 98.1 MHz)
IHF Band Pass Filter
Mono.
Stereo
S/N Ratio (1 mV input, 106% MOD, at 98.1 MHz)
IHF Band Pass Filter
Mono
Stereo
Frequency Response (at +1 dB, -3 dB)
20H2-15.5kHz 30 Hz - 15 kHz
11.2 dbf 17.2 dbf
2 45 dB 235 dB
2 100 dB 290 dB
2110 dB 2100 dB
12.2 dbf $15.2 dbf
17.2 dbf $23.2 dbf
40.2 dbf 43,3 dbf
45.3 dbf <48,3 dbf
0.2% 505%
0.4% <0,7%
270dB 265 dB
265dB 260 dB
AM Rejection Ratio (100 uV - 20 mV Input)
260 dB 2 50 dB
Search Level (at 98.1 MHz) 31.2 dbf 31.245 dbf
Automatic Stereo Threshold (at 98.1 MHz)
31.2 dbf 31.245 dbf
Muting Threshald (at 98.1 MHz) 31.2 dbf 31.245 dbf
Overload at 98.1 MHz
(100% MOD. 100 mV RF Input) 50.2% 50.5%
Suprious Response (at 98.1 MHz)
Antenna Input 3 uv 270 dB 2 60 dB
Capture Ratio at 40/60 dbf s2qdB $2.5 dB
Alternative Channel Selectivity (at 98.1 MHz + 400 kHz)
= 65 dB 255dB
Stereo Separation (at 98.1 MHz, 100% MOD., 1 mV Input)
IHF Band Pass Filter
100 Hz 240dB 235 dB
1 kHz 2 45 dB 240dB
10 kHz 235 dB 2 30dB
Output Voltage (at 100% MOD., 1 kHz Input)
Mono 500 mV S00 + 150 mV
Stereo 450 mV 450 4+ 150 mV
Tuning Cover Range
USA/Canada: 10 kHz Step
Europe; 9 kHz Step
Nominal imit
$20 - 1710 kHz
$22 - 11614 kHz
Usable Sensitivity (400 Hz, 30% MOD., S/N 20 dB)
Image Rejection (at 1400 kHz)
IF Rejection (at 600 kHz)
AGC Figure of Merit (From 100 mV/m at 1000 kHz)
Distortion (400 Hz, 30% MOD. 5 mV/m Input)
IF Bandwidth (6 dB Down, 350 uV/m)
Audio Response (5 mV/m Input 1 kHz 0 dB, 1000 kHz)
at -6 dB
Selectivity (at 350 uV/m)
+10 kHz
S/N Ratio (1000 kHz, With Antenna Input 5 mV/m)
<500 uVim 1000 uVim
235 dB = 30 dB
260 dB 250 dB
250 dB 245dB
08% S15%
6 kHz 4-11 kHz
80Hz-2.3kHz 100 Hz - 2 kHz
235 dB 225 dB
245 dB = 40dB

RF Overload (400 Hz 80% MOD, 100 mV/m Input)
<5% 10%
Search Level (at 1000 kHz) 800 uV 800 uV+6 dB
Output Voltage (400 Hz 30% MOD., 5 mV/m Input)
165 mV 165 440 mV
Whistle 10% = 15%
USA/Canada 180 W
Europe 500 W
Power Supplies;
USA/Canada AC 120 V, 60 Hz
Europe AG 230 V, 50 Hz
Dimensions (Wx H xD};
inches 178 x 6M x 1617
mm 440 x 155 x 420
Weight (lbs/kgs) 26,9/12.2
These specifications are service target specs.
Specifications and components are subject to change without notice.
Overall performance will be maintained or improved.

LEAKAGE TEST
Before returning the unit to the user, perform the
following safety checks:
1
Inspect all lead dress to makes certain that
leads are not pinched or that hardware is not
lodged between the chassis and other metallic
parts in the unit.
. Be sure that any protective devices such as
nonmetallic control knobs, insulating
fishpapers, cabinet backs, adjustment and
compartment covers or shields, isolation
resistor-capacity networks, mechanical
insulators, etc. Which were removed for
servicing are properly reinstalled.
Be sure that no shock hazard exists; check for
leakage current using Simpson Model 229
Leakage Tester, standard equipment item No.
21641, RCA Model WT540A or use alternate
method as follows: Plug the power cord
directly into a 230-voit AC receptacle (do not
use an Isolation Transformer for this test).
Using two clip leads, connects a 1500 Ohm,
10-watt resistor paralleled by a 0.15pF
capacitor, in series with ail exposed metal
cabinet parts and a known earth ground, such
as a water pipe or conduit. Use a VTVM or
VOM with 1000 Ohms per voit, or higher
sensitivity to measure the AC voltage drop
across the resistor. (See Diagram.) Move the
resistor connection to each exposed metal
part having a return path to the chassis
(antenna, metal cabinet, screw heads, knobs
and control shafts, escutcheon, etc.) and
measure the AC voltage drop across the
resistor. (This test should be performed with
the power switch in both the On and Off
positions.)
A reading of 0.35 volt RMS or more is
excessive and indicates a potential shock
hazard which must be-corrected before
returning the unit to the owner.
SIMPSON MODEL 229 ETC, FOR
LEAKAGE TEST
( ‘ ) TO AC GROUND SUCH
METAL SURFACE OF AS WATER PIPE BX CABLE
UNITUNDER Test = HGH GROUND — CONDUIT ETC.
TO EACH EXPOSED
OLTAGE
OR + LEAD
TEST PROBE
TO EXPOSED
METALLIC PARTS
LEAD
CONNECT TO KNOWN
EARTH GROUND

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CONTROLS AND FUNCTIONS
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1. POWER BUTTON li To use headphones for private 5. TREBLE CONTROL 8. DELAY TIM
Press this button to turn the power on. listening or monitoring, leave both Modifies the high-frequency sound of Adjusts time delay
Press again to turn the power off. It can 1 and 2 switches pushed out. the left and right channels as much as rear channels, ope
also be used as a system power button, OTE: if both kK itch +/- 10dB. Set this control at a suitable surround made is
if you connect the other components to NOTE: AE DOE L Sportal Swrenes.ale position for your taste and room button on page 16
the switched outlets. pushed icand Only-one. set of a acoustics. .
speakers is connected to the receiver, Adjusts the surrou
NOTE: in POWER OFF state, the no sound will be heard. steps. For Dolby
POWER indicator will light up orange 6. BALANCE CONTROL standard.
and power is partially supplied to the 3. HEADPHONE JACK This control is used for balancing the ar is
infrared remote control receiver and Stereo headphones can be piugged relative sound volume of the left and mS ee!
the memory circuitry. into this jack for private listening. right channel speakers. Clockwise
Headphone impedance should be rotation reduces the volume from the
between 8 and 2K ohms. Best results left speaker, counterclockwise rotation
z 12 SPEAKER SWITCHES between 200 and 400 ohms. reduces the volume from the right 9. PRO LOGI
ese switches allow you to select Press this button f
various combinations of speakers as speaker.
follows;
4.
BASS
CONTROL
10.
3
CHANN
I To drive 1 pair of speakers, push Modifies the low-frequency sound of 7. SURROUND-OFF MODE The. channel mo
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™@ To drive a second pair of speakers, position for your taste and room stereo mode.
push only the speaker 2 switch in. acoustics.
lf To drive both pairs of speakers,
push both 1 and 2 switches in.

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8. DELAY TIME
Adjusts time delay between front and
tear channels, operates only when the
surround mode is on. (see Delay Time
button on page 16).
Adjusts the surround delay time in
steps. For Dolby Surround 20ms is
standard.
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9. PRO LOGIC MODE
Press this button for Pro-Logic mode.
10. 3 CHANNEL MODE
The 3 channel mode can be used
when rear speakers are not being used
to provide a center (dialog) channel.
11. STADIUM/THEATER
MODE
Switches for selecting desired surround
mode; Stadium or Theater.
See Surround Sound Effects on page 13.
12. CENTER MODE
SELECTOR
This button operates only in DOLBY
PRO-LOGIC and DOLBY 3 STEREO
mode. The made changes as below,
when the button is pressed in
succession.
DOLBY PRO-LOGIC MODE
[ NORM — WIDE — PHANTOM 1
DOLBY 3 STEREO MODE
i NORM —> WIDE 71
The display window shows each mode.
NORM: Select this mode if you use a
small center speaker. The bass sound
of the center channel is reproduced from
the front speakers, because the smalt
speaker cannot produce enough bass.
WIDE: Select this mode if you use a
medium-to-large center speaker. The
bass sound is reproduced from the
center speaker.
PHANTOM: Select this mode if you
don’t use a center speaker. The center
speaker's sound is reproduced from the
front speakers.
13. TEST TONE BUTTON
This button operates only in DOLBY
PRO-LOGIC and DOLBY 3 STEREO
mode. When the button is pressed, 2
seconds of test tone is generated in all
channels (Left, Center, Right, and
Rear) in succession. The display
window shows TEST Left, Center,
Right, and Rear in succession (in
DOLBY PRO-LOGIC mode) or Left
Center or Right {in DOLBY 3 STEREO
mode) in succession. Use this button
to test speaker connections.
14. SOURCE/DIRECT BUTTON
This feature bypasses the tone control
circuitry, resulting in flatter frequency
response and wider bandwidth. When
it is activated, “DIRECT” illuminates in
the dispiay.
15. PRESET SCAN BUTTON
Press this button to scan the preset
station frequencies. The receiver
stops at each preset location that
contains a frequency for about 4
seconds, so you can hear a station.
The preset location indicator blinks 4
times. Press this button again to stap
scanning.
16. SEARCH SELECTOR
Press this button to select AUTO or
MANUAL tuning.
@ In AUTO made, scanning is
automatically continued up or
down until the next station is
picked up by pressing the
UP/DOWN tuning buttons. The
display window shows ‘AUTO’.
Use this mode to quickly find
strong AM or FM stations.
—™@ in MANUAL mode, the frequency
is changed by a step with the
UP/DOWN button. If you keep
pressing the UP/DOWN tuning
buttons, scanning is continued
until the button is released.
NOTE: Tuning Intervals:
FM = 50 KHz
AM 10 KHz
17. FM MODE BUTTON
Press this button to select stereo or
mono mode.
M™@ STEREO: Provides stereophonic
reception of an FM stereo
broadcast. The display window
shows ‘FMST’.
@ MONO: The left and right
channel signals detected from an
FM stereo broadcast are mixed
and reproduced through both
channels. If you want to find a
weak FM station, select this mode.
18. STATION MEMORY
BUTTON
Use this button to store an AM or FM
frequency. Press this button and
select one of 30 preset locations to
store the frequency with the STATION
PRESET buttons while the memory
indicator, ‘MEMORY’ blinks.
NOTE: When you store a frequency in
a memory location that already
contains a frequency, you replace the
previous frequency. If your receiver is
disconnected from AC power for more
than about 10 days, it loses all stored
frequencies.

19. UP/DOWN TUNING
BUTTONS
Press the DOWN button ( v ) to tune in
lower frequency stations, the UP button
(4) to tune in higher frequency
stations. If you press the DOWN
button when the display is at the
bottom of the frequency range, the
display returns to the top of the range.
If you press the UP button when the
display is at the top of the frequency
range, the display returns to the bottom
of the range. When the receiver finds
a strong frequency, the display window
shows ‘TUNED’.
20, FM/AM BAND SELECTOR
Press these buttons to select the FM
or AM radio band. When you select
the AM or FM radio band, the receiver
displays the last frequency selected on
that band.
21. STATION PRESET
BUTTONS
Select one of 30 preset locations to
recall the station stored in memory.
The input function is automatically
changed to TUNER when the button is
pressed. When you select numbers
from 10 through 29, you must select
the second digit within about 2
seconds. To select preset 30, simply
press “O".
22, TAPE 2 MONITOR
BUTTON
Set TAPE 2 MONITOR to the “off”
position when you want to hear the
other input functions. Press this button
to monitor the cassette deck connected
to the TAPE 2 MON input jacks.
23. INPUT FUNCTION
SELECTOR
Press the button to select the desired
input function: VCR 1, VCR 2, VDP,
TAPE 1, TV/Aux, Tuner, CD or Phono.
To dub from VCR 2 to VCR 1, press
the VCR 2 button and then press the
VCR 1 REC button.
For the input function of VCR 1 press
the VCR 2 button and VCR1 DUBBING
button. Set the recording VCR (VCR
1) to recording mode. Set the
playback VCR (VCR 2) to play a tape.
Dubbing will start.
M@ To hear another input source
during video tape dubbing: Press
the input function you want to
hear, and play the input source.
NOTE: If you press the TEST TONE
button during VCR 1 DUBBING, the
audio signal is not recorded.
24. VCR 2 SELECTOR
Push in this button to select the VCR 2
jacks on the front, rather than the VCR
2 jacks on the rear.
DISASSEMBLY PROCEDURES
REFER TO PAGE 21 and 33.
1] COVER TOP REMVOAL
Cover Top (51).
Cover Bottom (29).
Remove 8 screws {A) and then remove the
2] COVER BOTTOM REMOVAL
Remove 10 screws (B) and then remove the 4] VOLUME P.C.Board (PCB9) REMOVAL
AVR20MKII
25. VCR 2/CAMCORDER
INPUT JACKS
VIDEO IN:
Connect to the VIDEO OUTPUT jack
of a VCR (yellow jack).
AUDIO IN:
Connect to the AUDIO OUTPUT jacks
of a VCR (red and white jacks).
26. LOUDNESS BUTTON
Press this button to compensate for the
response of the human ear at low
listening levels (known as the
Fletcher-Munson hearing curve). The
high and low frequencies are
automatically boosted when this button
is pushed in. In the OFF position, the
frequency response Is flat at all volume
levels. This button does not work at
high volume levels.
27, VOLUME CONTROL
Turn the VOLUME clockwise to
increase the volume and
counterclockwise to decrease it. The
volume of the front, center, and rear
channels is changed at the same time.
28, VOLUME LEVEL
INDICATOR
This indicator moves in accordance
with the volume level, The indicator
blinks when the mute button on the
remote commander is pressed.
29. DISPLAY WINDOW
This window shows the state of
operation for easier control of the
receiver. It also contains the IR
Remote Sensor.
5. Disconnet (CP701 and CP7Q2) from the
Input P.C.Board (PCB9).
6. Disconnect (CP703) from the Video
P.C.Board (PCB2).
7. Remove 8 screws (C) and then remove the
Front Panel Assembly (AA).
3] FRONT PANEL ASSEMBLY REMOVAL
1. Remove the Cover Top (51), refering to the
previous step [I].
. Pull out the Volume Knob (1) with Volume
LED P.C.Board (PCB8).
. Disconnect (CP102 and CP503) from the
Volume P.C.Board (PCB6).
. Remove the Hex Nut fram the Volume-
motor to remove the Volume P.C.Board
1, Remove the Cover Top (51), referring to the 2
previous step [1]. 3
2. Remove the flat cable from wafer (CP401)
on the Volume P.C.Board (PCB9). 4
3.Disconnet (CP102) from the Volume
P.C.Board (PCB6). (PCB6).
4. Disconnect (CNT602) from the Surround 5
P.C.Board (PCB11).
. Remove 3 screws (M) and then remove the
Volume P.C.Board (PCB6).

AVR20MKIT
SPEAKER SEL. P.C.Board (PCB7) REMOVAL
. Remove the Cover Top (51), refering to the
previous step [1].
Remove the Front Pane! Assembly {AA),
refering to the Previous step [3).
Remove 4 screws (D) and then remove the
Sperker Sel. P.C.Board (PCB7).
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S
wo
TONE P.C.Board (PCB5) REMOVAL
. Remove the Cover Top(51), refering to the
Previous step
Remove the Front Panel Assembly (AA),
refering to the previous step [3}.
Pull the Bass, Treble, Balance Knobs (3).
Remove the Hex Nuts from the variable
resistors (17, 18).
5.Remove 3 screws (E) and then Tone
P.C.Board (PCBS).
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N
a
a
FRONT P.C.Board (PCB4) REMOVAL
1. Remove the Cover Top (51), refering to the
previous step
2,Remove the Front Panel Assembly (AA),
refering to the previous step [3].
3. Remove 9 screws (F) and then remove the
Front P.C.Board (PCB4).
[8] TUNER P.C.Board (PCB10) REMOVAL
1. Remove the Cover Top (51), refering to the
previous step [1].
2. Remove 3 screws (G) and then remove the
Tuner P.C.Board (PCB10).
[7] SURROUND P.C.Board (PCB11) REMOVAL
1. Remove the Cover Top (51), referring to the
previous step
2. Disconnect (CNT602) from the Surround
P.C.Board (PCB11).
3. Remove 2 screws (H) and then remove the
Surround P.C.Board (PCB11).
VIDEO P.C.Board (PCB2) REMOVAL
. Remove the Cover Top (51), refering to the
previous step [I].
. Remove the Surround P.C.Board (PCB11),
refering to the previous step [9].
. Disconnect (PC703, CP101 and CN301) from
the Video P.C.Board (PCB2).
. Disconnect (CP902) from the Sub-Woofer
P.C.Board (PCB3).
. Disconnect (CP301} from the Main
P.C.Board (PCB1).
Remove 5 screws (I) and then remove the
Video P.C.Board (PCB2).
No
w
4
oOo
>
SURROUND P.C.Board (PCB3) REMOVAL
1. Remove the Cover Top (51), refering to the
previous step [1].
2. Disconnect (CP902 and CP110) from the
Sub-Woofer P.C.Board (PCB3).
3. Remove 4 Screws (K) and then remove the
Sub-Woofer P.C.Board (PCB3).
CHASSIS BACK REMOVAL
1. Remove the Cover Top (51), refering to the
previous step [1].
2. Do Steps [2], [8], [9], 10] and {Il.
3. Remove 15 screws (J) and then remove the
Chassis Back (34).
13 MAIN P.C.Board (PCB1) REMOVAL
1, Remove the Cover Top (51
previous step [1].
2. Do Steps [2], [4], (8), [9] and (2).
. Unsolder all leads of (Q116, Q112, 0115,
Q123, Q126 and Q127) from copper track
on the Input P.C.Board (PCB9).
4, Disconnect (CP103, CP109 and CP206) from
the Main P.C.Board (PCB1).
5. Disconnect (CP110, CP701, CP702, CP204
and CP207) from the Input P.C.Board
(PCB9).
6. Remove the flat cable from wafer (CP401)
on the Input P.C.Board (PCB9)}.
. Remove 5 screws (L) and then remove the
Input P.C.Board (PCB9).
, refering to the
wo
~
MAIN P.C.Board (PCB1) REMOVAL
1. Remove the Cover Top (51), refering to the
previous step [I].
2. Do Steps [2], [8], [9], 10), 1] and (12).
3. Unsolder all leads of (Q216L/R, Q217L/R
and Q213L/R) from copper track on the
Main P.C.Board (PCB1).
. Disconnect (CP201, CP202, CP203, CP204,
CP206, CP207H and CP207T) from the Main
P.C.Board (PCB1).
. Remove 6 screws (N) and then remove the
Main P.C.Board (PCB1).
S
ot

_—.
CIRCUIT DESCRIPTION
CPU (4 bit CMOS MICROPROCESSOR : CXP50116-5300)
1. Pin Description & Block Diagram
+S2/PH2
VCR 2 +PC3
STAND BY-—S3/PH3
— VOL. DOWN+-S1/PH1 — VOL. UP--S0/PHO
— Veo
VOL. INDICATOR+-PC1 TAPE M, MUTE-PCO
Ten AM STEP
*—PD3 +—PD2
—EXTAL
os
LL
—nc VCR 1 —PC2
— NC
— Vrer
— XTAL
td
>
|
—
é
z
YPIIR-PDFOMTS
TAT
ZH
O-ESHEBE
®-©@ @-8 8-8
SEGMENT SEGMENT
11 pore fo eont ona Shana 2/0
@-@ 8-8 8-8 8-8 8-8 g-g * WH Ae
saeco)
{iL
tt]
©
8
g__8
g
8
+—-PD1
TUNED
S5/PG1— (Ponta | port 8 | port ¢ | eorto] porte | rontr.] rot | pont x | mort | }—+PDO-—STEREO
S6/PG2— 7 TFT @)-+PY3/RMC
S7/PG3-—
+
PY2/WP+
POWER
DOWN
S8/PKO-— ®-@ gy —py1/PWM— CE5(IC508)
a
$9/PK1—© 1 SuIPoT 65—+PYO-+TUNER MUTE
bata g ;
Snag gt Fogg Gomis ite
—
8
I|xa
perc
l.
8
|)
“outpur
id
ma
a
SEG $12/PJ0—@ Ey Sosu f)<—ePE1—» MAIN MUTE
counter
MEMORY
Fwenrennren oy
S13/PU1e-@ ff ene ene era eer | | tee O-© PEO CE4ICI01 10102)
13
:)
$14/PJ2-—@ wewony [aremmaren OT (h)-+PF3— (10506)
S15/PI3+— qd §)—+PF2—+ CE2(IC509)
$16/T15—@ 6)-—+PF1—+ NC
STU
6)—+-PFO-=
NC
$18/T13—@
e+ PA3—+ DATA {IGio1. 10102, IC506
—
$19/T12—
46
@—PA2+coLK
'C50B,
10509,
IC802
(—$20/T11—49
nus
txrau
@—PAI
Not
used
|
521/T10—d)
es
ne.
@Pad_]
Not
eed
$22/T9—
Gp
eek
@—+PX2/SI-VCR2
F/A
\—§23/TB—
@
bie-4
pam
ere
ioe
TI
@
6
@)—+PXO/SC-PROTECTION
——_——_
T6+—
@
: ‘
+
EC
—e———__
T5—
—
(}— PB3/AD7+-SURR. MODE
41)—+PB2/ POWER MUTE
a) rxo/EE
@
~@sie/ 113 -
@
@® vvesst @ Prisso
GRID
PI2/AD2+—
PI3/AD3—
PBO/AD4+—+ PB1/AD5.—
KEY
MATRIX

2. Input and Output Terminal Functions
Code Function
$4/PG0-S19/T12 These are segment signal output pins of FL controller/driver.
$20/T1-S23/T8 Not used
T7-T0 These are timing signal output pins of FL controller/driver
and key scan pins.
INT This is external interrupt dedicated pin.
TX, TEX Not used
RST This is the system reset of the device.
NC No connection
Voo This is the power supply pin.
PIO/ADO-PB1/AD5 These are the key input pins.
PB2/AD6 This is the power mute output pin.
PB3/AD7 This is the channel mode control pin of surround mode.
EC Not used.
PXO This is the protection input pin.
PX1 This is the remote control input pin.
PX2 This is the VCR2 front and rar input control pin.
PAQ Not used.
| PAI Not used.
PA2-PA3 These are used to control the PLL IC, analog switching IC.
Shift register IC, volume IC, delay IC. (CLK, DATA)
PFO This is the FM mode colntrol pin.
PF1 This is used to control the PLL IC.
PF2 This is used to control the shift register IC.
PF3 This is used to control the volume IC.
PEO This is used to control at analog switching IC.
PE1 This is the main mute output pin.
PE2 This is the surround mute output pin.
PE3 This is the center mute output pin.
PYO This is the tuner mute output in.
PY1 This is used to control the delay IC.
PY2 This is the power down pin.
PY3 Not used.
PDO This is the tuner stereo input pin.
PD1 This is the tuner tuned input pin.
PD2-PD3 These are used to control FM and AM step.
PCO This is used to eliminate the noise of the PLL IC
in the Tape 2 Monitor mode.
PC1 This is used to control volume indicator.
PC2 This is used to control VCR1
PC3 This is used to control VCR2
Vss This pin provides the ground potential.
XTAL, EXTAL These pin serve for connecting a clock oscillator crystal.
NC No connection.
Vrer Not used.
Vor This is the power supply pin of the FL controller.
PHO-PH1 These are used to control the motor volume.
PH2 Not used.
PH3 This is used to control stand-by mode.
10

3. Key Matrix
Pin No. 35 36 37 38 39 40
22 4 9 cD ie) 5 PHONO
23 VCR1 VCR2 TV T2M a TUNER
24 VCR1 REC) SURR MODE MEMORY SCAN
25 v A FM MODE |AUTO MANUAL FM AM
26 2 6 3 2 7 8
27 POWER
28 DELAY TIME TEST TONE CENTER MODE
4. Digital Tuning System Description
Digital Turing System
<Q FM PLL Loop
<1 AM PLL Loop
FM NT ___FM FRONT END PACK ——4
cr
|
|
Low Pass Filter
T806, T807
PLL Prescaler
FM IN
AM IN
AM ANT
Key
Switch
Matrix
FL
Display
11

+ Vco vs. FM Band Frequency Curve
(A} e6e1j0A, COA,
87.5 895 915 93.5 955 97.5 99.5 101.5 103.5 105.5 107.5
FM Band Frequency (MHz)
« Vco vs. AM Band Frequency Curve
(A)
aBey]0A,
094,
520
600
700
800 900
1000
1100
1200
1300
1400
1500
1600
AM Band Frequency (kHz)
12

5. Protection Circuits
Speaker Protection Circuit
The CPU protects both this unit and the speakers when an abnormally high current flows in Q216 L/R
and Q217 L/R due to excessive input drive, too low of a load impedance, or short of the speaker
terminals. If current increase is excessive, the voltage across R245 L/R or R246 L/R turns on Q218 L/R,
then 0219 turns on 0221.
It makes the protection port of the CPU to low state. Then the power is turned off.
027
R245. & gw
R249L f C223L 1
910
Q218L,
KTC31968
0.27
R246L wy
We
tl
O5mH
{vow
22 R2a7t R268
22 R2s8L et
WwW C231L
az
KTAI015 R253
: 3.3K
1 Oa
R252
C225
100K F 00 A251
68k
A280L,
216 6.8K
ca182
ROBT
aK
A2d3L
2K
Q217L
A165
Thermal Protection Circuit
This receiver has a overload thermal protection circuits to guard against abnormal operation.
When the temperature of TRANS POSISTOR installed with the main transformer or H/SINK POSISTOR
+15
R256
10K
TOCPU
(PROTECTION PORT)
R264
azz 22K
KTC31;
220
KTC3198
rises abnormally, the resistance of the posistor becomes larger and Q221 is turned on.
It makes the protection port of the CPU to low state. Then the power is turned off.
15
R256
10k
0221
KTC3198,
R254
tk
18k
L
‘ 224
a 4706.3)
15k
0220
KTC319B
R264
22k
TO CPU
poss | (PROTECTION PORT)
ms Ct t kK] R255T
D221 0220 47K
B1Vv 1N4148
TRANS - C418
CP207T
R255H
68k
«J a
D219
1N4148
+
Bl} |) HVSINK
cP207H
13

ALIGNMENT PROCEDURES
1. Equipment Required
+ AM Standard Signal Generator (AM SSG)
+ Oscilloscope
- AC Voltmeter
« FM Standard Signal Generator (FM SSG)
* Stereo Modulator
+ Audio Generator
+ Distortion Meter
+ DC Voltmeter
» Frequency Counter
Note : Disconnect external FM antenna prior to alignment.
2. Alignment and Test Points (PCB10)
72 Heh i
WD WA
DFigt
Gi ihe
[aes *,
;
wi
i"
oul
FH
iy
ab
Q
heel
FM:ADJ: AM-ADU :
ce Abt tia
3. AM IF and RF Alignment
Prepara tion
1. Output of Signal Generator should not be higher than necessary to obtain an optimum output reading.
2. Signal Generator Modulation: 30%.
3. Switch: Press to AM.
Signal Receiver + : -
Step Generator Frequency on Equipment Adjustment Adjust
Connection Point for
Frequency the Display
999 kHz 522 kHz DC Voltmeter T802 1.2 V reading
1 (400 Hz, Mod.) TP1
+.
1611 kHz DC Voltmeter TC802 8.5 V reading
TP1
2 594 kHz 594 kHz AC voltmeter to | T801 Maximum
{400 Hz, Mod.) TAPE OUT jack. | (ANT Coil) reading
1404 kHz 1404 kHz AC voltmeter to | TC801 Maximum
3 (400 Hz, Mod.} TAPE OUT jack. | (ANT Trimmer) | reading
14

450 kHz 999 kHz AC voltmeter to | T805 Maximum
4 (400 Hz, Mod.) TAPE OUT jack. | (IFT) reading
5 999 kHz 999 kHz Same as VR801 FL display 'TUNED"
{400 Hz, Mod.) Step 1. Indication on receiver
with AM SSG Output
level of 800 upV/m
2" (60 Cm) a Tape out
Receiver
|
|
Tuner |
Front-End |
|
Direct Coupling
AM Alignment Connection
4, FM IF Alignment
Preparation
1. Signal Generator output should be no higher than necessary to obtain an optimum output reading.
2. Switch Press to FM.
3. Signal generator deviation : 40 kHz.
Signal Receiver . ‘ :
Step Generator Frequency Equipment Adjustment Adjust
Frequency Display Connection Point for
1 98.0 MHz 98.0 MHz DC Volt meter to T803 Zero reading on DC
(1 kHz, Mod.) R809 (PCB10) | volt meter.
98.0 MHz 98.0 MHz Distortion T804 Minimum
2 (1 kHz, Mod.) meter to distortion
TAPE OUT jack |
98.0 MHz 98.0 MHz Same as VR802 FL display ‘TUNED’
3 (1 kHz, Mod.) Step 1 : Indication on
receiver with FM
SSG output level of
10 uV/m

Tape Out
Dc
Voltmeter
FM Antenna Receiver
Terminal (752) [oe eee ee a
Tuner
Front-End
FM Dummy
Antenna
752
Audio
Generator
FM RFIIF and MPX Alignment Connection
Frequency
Counter
5. MPX Alignment, SM Alignment
Preparation
1. Switch : Press to FM.
2. Tuner for 98 MHz on band.
3. Signal Generator output level : 1000 pV.
4 Deviation : 40 kHz, at 100% modulation of composite signal.
5.
Connect
Signal
Generator
to
FM
antenna
terminal
through
FM
dummy
antenna
(75
Q).
Signal
19 kHz Generator Equipment Adjustment Adjust
Step | Modulation Frequency Connection Point for
Level Setting
Pilot off Carrier only Frequency counter VR803 | 76 kHz
1 connect to TP2 (HOT)
of PCB and ground
8% Mod. Composite to AC voltmeter to TAPE - Adjust for about
2 channel OUT jack of R 450mV of audio
1kHz R channel output
8% Mod. Composite to AC voltmeter to TAPE VR804 | AC voltmeter reading
3 channel OUT jack of R should be at least 40
1kHzb channel dB below.
4 8% Mod. Composite to AC voltmeter to TAPE VR804 | Same as Step 3.
channel 1kHzR | OUT jack of L channel
5 8% Mod. Composite to AC voltmeter to TAPE VR805_ | FL display 'SIG 60 dB'
channel OUT jackLorR — indication on receiver
1kHzLorR channel with FM SSG output
lenel of 1000 nV/m
If you could not obtain -40dB readings in Steps 3 and 4 (compared with Step 2), readjust VR804
until you obtain -40dB readings for both Steps 3 and 4, Nominal is -45 dB.

AVR20MKII
TROUBLESHOOTING
Symptom Cause and Remedy
Receiver inoperative A) Faulty AC power cord.
(FL indicator does not light) Replace.
B) Defective the power switch.
Replace.
C) Broken wire in the power transformer.
Replace the power transformer.
D) Blown fuse.
Replace the fuse.
Fuse blows when power is turned on. | A) Defective power transformer.
Replace.
B) Short on the primary or secondary of the transformer
circuitry.
Repair the trace.
C) Damaged rectifier (D208 to D211) or damaged transistor
(Q216 to Q217). Replace the defective componentis).
D) Short circuit in the amplifier circuit.
Replace the shorted componentis) in the amplifier circuit.
Power indicator lights but no sound A) Speaker switch 1 or 2 defective.
from both channels Replace the defective switch (es)
B) Defect in transistor Q216 L/R, Q217 L/R on the Main
Amp Board.
Replace the defective component(s).
Speaker A inoperative A) Speaker switch A defective.
Replace
Speaker B inoperative A) Speaker switch B defective.
Replace.
One channel does not work when A) Defect in transistor Q216 L/R, Q217 L/R on the Main
Volume is at maximum with a test Amp Board
signal applied to the center terminal Locate and correct the defect.
of Volume control VR5 of the dead B) Break in copper foil of printed circuit board.
channel Repair the circuit trace.
C) Short in speaker output terminal.
Repair or replace.
Speaker works normally but A) Headphone plug does not mate with jack.
headphones inoperative Replace the jack.
B) Defective resistor R901, R902.
Replace.
PHONO input inoperative A) Poor contact in phono input jack.
Repair or replace the jack.
B) Defective phono switch or IC 103. :
Replace.
LOUDNESS has no effect A) Defective loudness switch.
Replace.
B) Defective resistor R601, R602, C601, C602.
Replace the defective components(s),
FM inoperative A) Defective front-end. (FE407-G60)
Replace.
B) Defective FM switch.
Replace the switch
17

cies,
Symptom
Cause and Remedy
FM inoperative
C) Defective transistor 0801, 0805, Q806, IC801, IC803
Replace the defective transistor(s) or IC(s).
D) Defective coil T803 or T804
Replace the coil(s).
E) Defective lead-in.
Repair or replace the lead-in.
F) Ceramic filter CF801, CF802, CF803 defective.
Replace the defective ceramic filter(s).
G) Defective controller circuit component.
Replace.
Poor multiplex separation
A) Improper adjustment.
Readjust VR803 and VR804.
(Refer to MPX Alignment.)
B) IC803 defective.
Replace.
C) Variable resistor VR803 or VR804 defective.
Replace the variable resistor({s).
STEREO indicator does not light
A) Defective indicator in FL.
Replace.
B) Improper adjustment of VR803 of tuner board.
Make readjustment.
C) Defective IC803
Replace the defective component.
FM volume not sufficient
A) If volume from both L and R channels is not loud
enough:
Front end Section defective.
Faulty IC801, Coil T803,
Defective C838 of tuner Board.
If sound of one channel is not loud enough:
Defective T806, T807
FM Mono has no effect
A) Defective FM MODE switch.
Replace.
AM inoperative
A) Damaged IC801 of tuner board.
Replace.
B) Defective T801, T802, T805 or CF804 of tuner board.
Replace the defective component(s).
C) Resistor R829, R817 defective.
Replace the defective component(s).
D) Capacitor C836, C818, C813 defective.
Replace the defective capacitor(s).
E) Defective AM switch
Replace.
F) Defective varicap diode VD1, VD2
Replace varicap diods(s).
G) Damaged AM loop antenna.
Repair or replace.
H) Defective controller circuit component.
Replace.
Bass control has no effect
A) Variabie resistor BASS defective.
Replace.
B) Defective R709L/R, R710L/R, C702L/R, C708L/R
Replace the defective component(s).