Akai AT-K11/L User manual

AT-K11/L
AT-K22/L
AM-U11
AM-U22
FM
AM
STEREO
TUNER
AT-K11/L
move.
AT-K22/L
STEREO
INTEGRATED
AMPLIFIER
AM-UI11
wopeEL AM-U22
THIS
MANUAL
IS
APPLICABLE
TO
BOTH
SILVER
AND
BLACK
PANEL
MODELS
SECTION
1
MODEL
AT-K11/L
and
AT-K22/L
SERVICE
MANUAL
............
3
SECTION
2.
MODEL
AM-U11
and
AM-U22
SERVICEMANUAL...............
27
SECTION
3
PARTS
LIST
SECTION
4
SCHEMATIC
DIAGRAM

» ®
») ®
SECTION 1
SERVICE MANUAL
MODEL AT-K11/L, AT-K22/L
TABLE OF CONTENTS
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PD AMODE TANT R20 ire} i Sseics ass g Me ale eae a ae’s, hodet Mae 8 Sch tien Sel oe aes ben Ps Sua 5
Il. DISMANTLING OF UNIT ........0....0 00. cc cece cece eee ceeeeeeeneeeeunesrnees 6
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He MODEL ATT Me o.0 6 si cals a's ped one's a env nS ed acd Hae Bad oeeae ee a oe dee eet en 8
Di MODE AT R816 5.3 2 J 2 irs ah Bah ach alobt stead yl acd are ae unten: dduee a Reese here 9
IV. PRINCIPALPARTS LOCATION ............ 0000. c cece cece cece eueeeeeueeeenes 10
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V. VOLTAGECONVERSION ............0 ccc cece ce eeceeeeeeueeuues Oecd Ghee cig cadens 12
VI. TUNER ADJUSTMENTS .........0.00.. 00000. c cece ccc cece cece eeeeeuneeeannteunes 13
1. FMSECTION ADJUSTMENTS ............ 0.0 cee cc eee cece ec ueeeeueveeeunees 16
2. AM(AT-K11 Land AT-K22 L:MW) SECTION ADJUSTMENTS ...........0..00cceeeueee 18
3. LW SECTION ADJUSTMENTS a4 is0.08 a 0% s deel os bos ba nea a ees Hob saw Eee 19
VII.
TUNING
CORD
THREADING
....
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20
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p19) 5) 21 DY 2.921 | Ce a ee asa as 20
VIII. CLASSIFICATION OF VARIOUS P.C BOARDS ............- ccc cece cece ceeesueeueees 1
1. P.C. BOARD TITLES AND IDENTIFICATION NUMBERS ........ 022.000 cceeeeceeeaes 21
2. COMPOSITION OF VARIOUS P.C BOARDS ......... 00.0. cece eee c ee eesueeeeuees oy)
For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL. ,

I. TECHNICAL DATA
1. MODEL AT-K11/L
FM TUNER SECTION
TUNING FREQUENCY RANGE | 87.5 MHz to 108.0 MHz
USABLE SENSITIVITY
(IHF) (300 ohms) 19 pV
CAPTURE RATIO 13 4B
SELECTIVITY (IHF) (400 kHz) 60 dB
IMAGE REJECTION 55 dB
IF REJECTION 85 dB
SPURIOUS REJECTION 85 dB
AM SUPPRESSION 60 dB
SUB CARRIER SUPPRESSION 60 dB
S/N (MONO/STEREO) 70 dB/65 dB
T.HD. (MONO/STEREO) 0.1%/0.15%
STEREO SEPARATION (1 kHz) 45 dB
MUTING LEVEL (INPUT LEVEL) 22 4B
AM
TUNER
SECTION
(MW
FOR
AT-K11L)
a
TUNING
FREQUENCY
RANGE
525
kHz
to
1,605
kHz
@)
USABLE SENSITIVITY (IHF)
BAR ANTENNA 100 uV/m
EXTERNAL ANTENNA 10 pV
SELECTIVITY (IHF) 30 dB
IMAGE REJECTION 48 dB
IF REJECTION 33 dB
S/N 50 dB
T.HD. 0.3%
LW TUNER SECTION (AT-K11L ONLY
TUNING FREQUENCY RANGE 135 kHz to 350 kHz
USABLE SENSITIVITY (IHF)
BAR ANTENNA 200 pV/m
EXTERNAL ANTENNA 17 pV
SELECTIVITY (IHF) 30 dB
IMAGE REJECTION
IF REJECTION
S/N
THD.
¢
OUTPUT SECTION
OUTPUT LEVEL FM(100% MOD.) 775 mV
_ AM(30% MOD.) 250 mV
OUTPUT IMPEDANCE 3.3 kohms
POWER REQUIREMENTS 120 V, 60 Hz for U.S.A. and Canada
220 V, 50 Hz for Europe except UK
240 V, 50 Hz for UK and Australia
110 V/220 V/240 V, 50/60 Hz internally switchable for othex
countries.
DIMENSIONS 440(W) x 78(H) x 333(D) mm
(173 x 3.1 x 13.1 inches)
WEIGHT 4.6 kg (10.1 Ibs)
* For improvement purposes, specifications and design are subject to change without notice.

)®
Re
,
2. MODEL AT-K22/L
FM TUNER SECTION
TUNING
FREQUENCY
RANGE
87.5
MHz
to
108.0
MHz
USABLE SENSITIVITY
(IHF) (300 ohms) 1.9 uV
CAPTURE RATIO 1.3 dB
SELECTIVITY (IHF) (400 kHz) 65 dB
_ IMAGE REJECTION 56 dB
IF REJECTION 90 dB
SPURIOUS REJECTION 85 dB
AM SUPPRESSION 60 dB
SUB CARRIER SUPPRESSION 60 dB
S/N
(MONO/STEREO)
73
dB/65
dB
T.H.D.
(MONO/STEREO)
0.1%/0.15%
STEREO SEPARATION (1 kHz) 45 dB
MUTING LEVEL (INPUT LEVEL) 22 dB
AM TUNER SECTION (MW FOR AT-K22L)
TUNING FREQUENCY RANGE
525 kHz to 1,605 kHz
USABLE SENSITIVITY (IHF) (BAR)
100 uV/m
SELECTIVITY (IHF)
30 dB
IMAGE REJECTION
48 dB
IF REJECTION
LW TUNER SECTION (AT-K22L ONLY)
33 dB
TUNING
FREQUENCY
RANGE
135
kHz
to
350
kHz
USABLE
SENSITIVITY
(IHF)
BAR
ANTENNA
200
pV/m
EXTERNAL
ANTENNA
17
pV
SELECTIVITY
(IHF
30
dB
IMAGE
REJECTION
45
dB
IF
REJECTION
33
dB
S/N 50 dB
T.H.D.
0.3%
OUTPUT SECTION
OUTPUT
LEVEL
FM(100%
MOD.)
775
mV
AM(30% MOD.) 250 mV
OUTPUT
IMPEDANCE
3.3
kohms
POWER
REQUIREMENTS
120
V,
60
Hz
for
U.S.A.
and
Canada
220
V,
50
Hz
for
Europe
except
UK
240
V,
50
Hz
for
UK
and
Australia
110
V/220
V/240
V,
50/60
Hz
internally
switchable
for
other
-
countries.
DIMENSIONS
440(W)
x
78(H)
x
290(D)
mm
(17.3
x 3.1.x
114
inches)
WEIGHT
4.5
kg
(99
lbs)
*
For
improvement
purposes,
specifications
and
design
are
subject
to
change
without
notice.

|.
DISMANTLING
OF
UNIT
1. MODEL AT-K11/L
In
case
of
trouble,
etc.
necessitating
dismantling,
please
dismantle
in
the
order
shown
in
the
photographs.
Reassemble
in
reverse
order.
SCREWS
FRONT PANEL
UPPER COVER 4

nnn
2. MODEL AT-K22/L
In case of trouble, etc. necessitating dismantling, please
dismantle in the order shown in the photographs.
Reassemble in reverse order.
SCREWS c q
b ¢ SCREWS
a SCREWS b FRONT PANEL ¢
UPPER COVER a

CONTROLS
1. MODEL AT-K11/L
=
w&
oN ans
GERIAL NUMBER a
3 $1280-%2577 f;
perenne Ce
‘SROLK HATARD--0G NOT OPEN?
HASOUE DE CRRC— NE PAS ERLEVER!
‘RERUMRONESCEFANR~WICHT GFFREN!
POWER SWITCH
FM DIAL SCALE (AT-K11)
LW AND MW DIAL SCALE (AT-K11L)
AM DIAL SCALE (AT-K11)
FM DIAL SCALE (AT-K11L)
FM MODE SELECTOR
FREQUENCY INDICATOR
SIGNAL
STRENGTH
INDICATOR
FM
TUNING
INDICATOR
FM STEREO INDICATOR
10.
11.
12.
13.
14.
15.
16.
ac
110-240¥
50/60Hz
1OW
AKAL ELECTRIC CO, LID.
a
§
tide of indicated
verve ih
MADE IN JAPAN rv 69 k
Fig. 1 Controls (AT-K1 1/L)
FM SWITCH (AT-K11)
FM/AM BANK SELECTOR (AT-K11L)
AM SWITCH (AT-K11)
MW/LW BAND SELECTOR (AT-K11L)
TUNING KNOB
FM AND AM ANTENNA TERMINALS
AM ANTENNA (ANT) SELECTOR (AT-K11 L ONLY)
AM FERRITE BAR ANTENNA
OUTPUT JACKS (RIGHT AND LEFT}
AC CORD (CEE, SAA AND UK: AC INLET)

2. MODEL AT-K22/L
FMAM TM UNO mee OT me
110-2007 FE
50/60H:
TOW
‘SHOCK GAZARD—G6 RET OPER?
pia
arte
e
tat
ca
ata
abet
AKAl
ELECTRIC
CO. LID
RERSARUNGSSETAR—
WICRT
OFFEH!
moog.
NO.
AT-K22
ore.
a
peees
MADE IN JABAN Shop for necessary.co sion
Fig. 2 Controls (AT-K22/L)
1.
POWER
SWITCH
8.
AM
SWITCH
(AT-K22)
2.
FM
MODE
SWITCH
MW/LW
BAND
SELECTOR
(AT-K22L)
3.
DIGITAL
LED
DISPLAY
9.
TUNING
KNOB
4.
SIGNAL
STRENGTH
INDICATOR
10.
FM
AND
AM
ANTENNA
TERMINALS
5.
FM
TUNING
INDICATOR
11.
AM
ANTENNA
(ANT)
SELECTOR
(AT-K22L
ON
LY)
6.
FM
STEREO
INDICATOR
12.
AM
FERRITE
BAR
ANTENNA
7.
FM
SWITCH
(AT-K22}
13.
OUTPUT
JACKS
(RIGHT
AND
LEFT)
AM/FM
BAND
SELECTOR
(AT-K22L)
14.
AC
CORD
(CEE,
SAA
AND
UK:
AC
INLET)

at gg
=
een a tn en
IV.
PRINCIPAL
PARTS
LOCATION
a
1.MODEL
AT-K11/L
STEREO
INDICATOR Di
DIAL
POINTER
TUNING
o1,0
INDICATOR
02
TUNING
SHAFT
POWER
SWITCH
SIGNAL
STRENGTH
BAND
SELECTOR
sw90l
INDICATOR
03
FM
MODE
SELECTOR
LED
PCB
ATKZ-I6B(U/T)
swil
ATKZ-47B(AAL
,CSA)
ATKZ-48BI(CEE,UK,SAA)
Fig. 3 Front View
POWER
TRANSFORMER
AM
BAR
ANTENNA
ANSOI
FRONT
END
ul
T9OI
AT-KIIT
FF
I26uI2
POWER
SWITCH
TUNER
PCB
ATKZ-
I6A(U/T)
ba
Sw90!
ATKZ-47A(AAL,CSA)
ATKZ
-48A
(CEE
,UK,SAA)
Fig. 4 Top View
I

;
: 2. MODEL AT-K22/L
TUNING INDICATOR
d2
POWER SWITCH
swsg0l
SIGNAL STRENGTH
STEREO INDICATOR
INDICATOR D3 Dl
TUNING SHAFT
;
H
}
digi
FM MODE SELECTOR DIGITAL LED
swi DISPLAY INI
BAND SELECTOR
®
,
Fig.
5
Front
View
POWER
TRANSFORMER
AM
BAR
ANTENNA
ANSOI
FRONT
END
;
T9O0I
AT-K200T
FFI3Z6UI2
POWER
SWITCH
TUNER
PCB
LED
PCB
COUNTER
PCB
Sw90!
ATKZ-I6A(U/T)
ATKZ
-I6B(U/T)
ATKZ-I7
ATKZ
47A(AAL,CSA)
ATKZ-47B(AAL,CSA)
ATKZ-48A(CEE,UK,SAA)
ATKZ
-48B(CEE
,UK,SAA)
Fig. 6 Top View
1]

V. VOLTAGE CONVERSION
REAR PANEL _/7%) a CI has
if
A
HOV AREAS:FI O4A 250V
220V AREAS:F2 0.2A 250V
Cor
240V
AREAS:F3
02A
250V
3
C]
F2
1
sR oe
:
:
FRONT SIDE
Fig 7 Voltage Conversion (U/T Model Only)
Models for Canada, U.S.A., Europe, UK and Australia
are not equipped with this facility.
Each machine is preset at the factory according to desti-
nation but some machines can be set to 110 V, 220 V,
or 240 V as required.
If voltage change is necessary, this can be accomplished
as follows.
i! 1) Disconnect AC Power Cord.
2) Loosen holding screws and remove upper case.
3) Remove existing Line Voltage Fuse and insert required
Line Voltage Fuse in proper fuse holder. Follow
markings explicitly.

VI. TUNER ADJUSTMENTS
BAR ANTENNA CORE AM LOW RANGE SENS.
T®\\
oS)
iS)
VRi -
TES | FM MUTING
LEVEL
Tlb_ ‘Tia
Tla: FM CENTER VOLTAGE O © on
Tlb : FM DISTORTION Tel =
cf ©) A> &
RUNNING F =O Koy
:
nig
TRS
(oh FM SIONAL
EM Stereo LED SENS
SEPARATION
i
TC3
FM a RANGE
SCALE
LPF LPF
vci
AM HIGH RANGE
SENS
- T4(REO)
AM LOW RANGE
SCALE
ve2
AM HIGH RANGE
SCALE
Fig. 8 Tuner P.C Board

se ea a Ee SIRE RE A RE AANA ETN EEE A
Lw LOW RANGE SENS: eon) ual Low RANGE SENS. {600KHz)
soeaenon
ose
SE
areas
=
re
ee
°
——
ee
ee
BAR ANTENNA
La)
TI : LOW RANGE SENS.(EXT ANT)
VCI : HIGH RANGE SENS. (EXT ANT) vc2|
VC2 : HIGH RANGE SENS. (BAR ANT)
Tl
77 \
ANTENNA SWITCH PCB
ATK-2063
wae
a a
o a
a a
a a
qo J] HIGH RANGE
: ic | _ENDIGATION
ae TS(GRN)
oe @ |u: RANGE
a a @ (ouaine
a a
a
TUNER PCB ATKZ-48A
BAND
Fig. 9 Tuner P.C Board ATKZ-48A and Antenna Switch
P.C Board ATK-2063 (AT-K11L and AT-K22L)
14

DIGITAL LED
DISPLAY FREQUENCY ° 9° 9 9 O
FM OSC o
GND o
AM OSC 0
GND o
Fig. 10 Counter P.C Board ATKZ-17
FREQUENCY
COUNTER
RESISTOR
{00 K OHMS
TERMINATION PAD
‘a © ©
[701s : 300 0m] |
O ANTENNA
TERMINAL
Rh
|
AC
VOLTMETERR
FM STEREO
GENERATOR
Fig. 11 Instrument Connections
15

ene mA RR:
¥
Ya eee me es
1. FM SECTION ADJUSTMENTS (Refer to Figs. 8, 10, 11)
Unless
otherwise
specified,
use
teh
adjustment
points
provided
on
the
Tuner
P.C
Board
(Fig.
8).
2 Center
3 Voltage
of Output
Level «
Factor
Gs
5 |Confirmation
Resuit
———
Remarks
—
Maximum Noise
Level
BAND switch to FM, and MODE to MONO.
Turns only noise without interference from
broadcasting.
Ste Adjustment Adjustment
P Item Point
1 Front-end T1 (BLK)
IF Coil (Front-end)
Tl-a
Centered Tuning
Connect a Center Tuning Meter between TP1
3 Distortion T1-b
Meter and TP2. (See Note 1)
Indication Turns only noise without interference from ~
broadcasting.
Distortion 98 MHz, 60 dB, 1 kHz (mono 100%) input.
Factor: Less than 0.1%
0 dBm +3 dB
Less than 0.1% in both channels.
Readjust in Steps 2 and 3.
98 MHz, 60 dB, 1 kHz (mono 100%) input.
pa
6 Signal LED
Sensitivity
7 ~~ | Digital LED
Display
Frequency
(AT-K22/L
Only)
Board (Fig. 10)
VR2 (30 K) 98 MHz, 50 GB input.
Adjust VR2 to a point where 5th LED of
SIGNAL LED lights up. (See Note 2)
VRI (10 KB) Apply a 98 MHz, 60 dB input.
Counter P.C Short TP1 to GND on the Counter P.C Board.
Adjust VR1 until 3rd numeral display becomes
stable position. (See Note 3)
8 High Range TC3 (Model AT-K11/L) 108 MHz, 60 dB, 1 kHz (mono 100%) input.
Scale (Front-end) Maximum Output Scale indicator to 108 MHz.
Indication ‘ Minimum Distortion Error: Within + 250 kHz.
Factor
(Model AT-K22/L) Turn tuning knob fully clockwise.
L Display 108 MHz by adjusting TC3.
9 High Range TCA, TCB Distortion Factor: MODE switch to MONO.
Sensitivity (Front-end) Less than 3% 108 MHz, Less than 6 dB, 1 kHz (mono) input.
10 |Confirmation Distortion Factor: 88 MHz, Less than 6 dB, 1 kHz (mono) input.
of Low Range Less than 3% (See Notes 4 and 5)
Sensitivity
11 |Muting Level VR1 (30 K) 22 dB+6dB MODE switch to STEREO.
98 MHz, 22 dB, 1 kHz (mono 100%) input.
Adjust VR1 until the output signal is reduced
to zero.
Vary the SSG output by +6 dB and check mut-
ing operation.
es
12 |PLLIC Free VR3 (4.7 K) 19 kHz + 50 Hz Connect a Frequency Counter between TP3
Running and GND on the Tuner P.C Board. (See Note
Frequency 6)
13 Stereo VR4 (500) More than 45 dB 98 MHz, 60 dB, 1 kHz (stereo 100%) Lch input.
Separation Minimum output of Rch.
(Left>Right)
14 Stereo VR4 (500) More than 45 dB 98 MHz, 60 GB, 1 kHz (stereo 100%) Rch input.
Separation Minimum output of Lech.
_|(Right>Left)

Step Adjustment Adjustment.
Item Point Result
Remarks
zat,
100 MHz, 60 dB, 1 kHz (stereo 100%) input.
15 |Confirmation
Distortion Factor:
of
Stereo
Less
than
0.15%
If
distortion
exceeds
0.15%,
first
check
accord-
Distortion
ing
to
Steps
2,
3,
12,
13
and
14,
and
then
re-
Factor
adjust according to Step 1.
Notes:
1.
For
the
Center
Meter
should
be
used
the
tuning
meter
and
the
like
available
as
a
part
of
the
other
models.
2.
The
Sth
LED
lights
up
at
50
dB
but
when
the
attenuator
is
decreased
2
dB
it
is
extinguished.
3.
(vq
g Au MHz
The optimum point of adjustment is when the
indicated figure stops flashing.
.
When
the
specified
sensitivity
of
6
dB
cannot
be
obtained
at
the
two
frequency
points,
88
MHz
and
108
MHz,
repeat
the
adjustment
as
described
in
Step
9.
.
When
the
sensitivity
distortion
factor
still
does
not
comply
with
the
data
specifications,
adjust
by
turning
the
Front-end
IF
Coil
core,
but
not
more
than
1/2
turn.
6.
When
connecting
a
Frequency
Counter,
connect
from
TP
via
a
100
kohms
resistor.
(Refer
to
Fig.
11)
17

bee
:
i
re He eet oes
Ree Seen
an eee tone ee NNN NO ae TAO
a DT ee oer OOS ni
Yer Ebseeeeaee
2.
AM
(AT-K11L
and
AT-K22L:
MW)
SECTION
ADJUSTMENTS
(Refer
to
Figs.
8, 9,
10,
12)
APRROX
600mm
TEST LOOP
ANTENNA
SET
VOLTMETER
Fig.
12
Instrument
Connections
For
AM(MW)
Section
Adjustments
and
Steps
1
to
4
of
LW
Section
Adjustments
Unless
otherwise
specified,
use
the
adjustment
points
provided
on
the
Tuner
P.C
Board
(Fig.
8)
*
Model
AT-K11L
and
AT-K22L:
ANTENNA
SELECTOR
to
INT.
=
ee
Adjustment
Adjustment
Result
Remarks
|
Item Point
as
a
1
|
Digital
LED
|
VR2
(10
KB)
Apply
a
1,000
kHz,
50
dB
input.
Display
Counter
P.C
Short
TP1
to
GND,
and
TP2
to
GND
on
the
Frequency
Board
Counter
P.C
Board.
(AT-K22/L
(Fig.
10)
Adjust
VR2
until
4th
numeral
display
becomes
Only)
stable
position.
(See
Note
1)
AM
IF
Coil
T2
(BLK)
Maximum
Output
1,000
kHz,
50
dB,
400
Hz
(30%)
input.
T3 (BLK)
3
Low
Range
T4
(RED)
(Model
AT-K11/L)
530
kHz,
50
dB,
400
Hz
(30%)
input.
Scale
Maximum
Output
Scale
indicator
to
530
kHz.
Indication
Error:
Within
2%
(Model
AT-K22/L)
Turn
tuning
knob
fully
counterclockwise.
aie
Display
515
kHz
by
adjusting
T4.
|
-—
4
|
High
Range
vC2
ie
(Model
AT-K11/L)
|
1,600
kHz,
50
dB,
400
Hz
(30%)
input.
Scale
Maximum
Output
Scale
indicator
to
1,600
kHz.
Indication
|
My
Error:
Within
2%
|
(Model
AT-K22/L)
‘Turn
tuning
knob
fully
clockwise.
|
_|
Display
1,650
kHz
by
adjusting
VC2.
5
“|
Low
Range
Bar
Antenna
Maximum
Output
600
kHz,
50
dB,
400
Hz
(30%)
input.
|
Sensitivity
Core
Distortion
AT-K11,
K22:
Factor:
Less
than
10%
Fig.
8
AT-K11L,
K22L:
Fig.
9
6
High
Range
VCl
Maximum
Output
1,600
kHz,
50
dB,
400
Hz
(30%)
input.
Sensitivity
Distortion
Factor:
Less
than
10%
|
Notes:
1.
The optimum point of adjustment is when the
indicated figure stops flashing.
2.
For
best
result,
repeat
Steps
2
through
6
two
or
three
times.
a
18

3. LW SECTION ADJUSTMENTS (AT-K11L and AT-K22L Only; Refer to Figs. 9, 12, 13)
SET
AC VOLTMETER
Fig. 13 Instrument Connections For Steps 5 and 6 of LW Section Adjustments
Unless otherwise specified, use the adjustment points provided on the Tuner P.C Board (Fig. 9).
* BAND SELECTOR to LW
ANTENNA SELECTOR to INT.
High Range. | Range
Scale
Indication
(AT-K11L)
Maximum Output
340 kHz, 50 dB, 400 Hz (30%) input.
Scale indicator to 340 kHz.
Error: Within 2% (Refer to Fig. 12)
-| Turn tuning knob fully clockwise.
Display 350 kHz by adjusting VC 3.
150 kHz, 50 dB, 400 Hz (30%) input.
Scale indicator to 150 kHz.
Error: Within 2% (Refer to Fig. 12)
(AT-K22L) Turn tuning knob fully counter-clockwise.
Display 135 kHz by adjusting TS.
Maximum Output 160 kHz, 50 dB, 400 Hz (30%) input.
Distortion Factor: (Refer to Fig. 12)
Less than 10%
(AT-K22L)
Low Range
Scale
Indication
TS (GRN) (AT-KI1L)
Maximum Output
Low Range Bar Antenna
Sensitivity Core
Bar Antenna) (Fig. 9)
High Range vCc2 Maximum Output 300 kHz, 50 dB, 400 Hz (30%) input.
Sensitivity | Antenna Switch Distortion Factor: (Refer to Fig. 12)
Bar Antenna) P.C Board Less than 10%
(Fig. 9)
Low Range Tl Maximum Output ANTENNA SELECTOR to EXT.
Sensitivity Antenna Distortion Factor:
(EXT. Switch P.C Less than 10%
Antenna) Board (Fig. 9)
160 kHz, 20 dB, 400 Hz (30%) input.
(Refer to Fig. 13)
High Range VCi Maximum Output 300 kHz, 20 dB, 400 Hz (30%) input.
Sensitivity | Antenna Switch Distortion Factor: (Refer to Fig. 13)
(EXT. P.C Board Less than 10%
Antenna) (Fig. 9)
19

Vi.
TUNING
CORD
THREADING
1. MODEL AT-K11/L
ai
(SRS
ye FINISH
START
PAINT LOCK WITH
ADHESIVE
AGENT
PAINT
LOCK
WITH ADHESIVE
a AGENT
T
APPLY MINUTE AMOUNT OF
OIL TO SHAFT APERTURE
(AVOID GETTING OIL ON THREAD)
2. MODEL AT-K22/L
wee i FRNISH
START
PAINT LOCK
WITH ADHESIVE
—— AGENT
APPLY MINUTE AMOUNT OF
OIL TO SHAFT APERTURE
(AVOID GETTING OIL ON THREAD)
Fig. 15 Tuning Cord Threading (AT-IC22/L)
20

Vill.
CLASSIFICATION
OF
VARIOUS
P.C
BOARDS
1. P.-C BOARD TITLES AND IDENTIFICATION NUMBERS
1) Model AT-K11
P.C Board Title
Tuner P.C Board
P.C Board Number
ATKZ-16A (U/T) a
ATKZ-47A (AAL, CSA)
ATKZ-48A (CEE, SAA)
ATKZ-16B (U/T)
ATKZ-47B (AAL, CSA)
ATKZ-48B (CEE, SAA)
LED P.C Board
2) Model AT-K11L
P.C Board Title be - P.C Board Number
Tuner P.C Board ATKZ-48A
LED P.C Board ATKZ-48B
Antenna Switch P.C Board ATK-2063
3) Model AT-K22
P.C Board Title
Tuner P.C Board
LED P.C Board
P.C Board Number
ATKZ-16A (U/T)
ATKZ-47A (AAL, CSA)
ATKZ-48A (CEE, SAA)
ATKZ-16B (U/T)
ATKZ-47B (AAL, CSA)
ATKZ-48B (CEE, SAA)
Counter
P.C
Board
ATKZ-17
|
4)
Model
AT-K22L
PC
Board
Title
P.C
Board
Number
—
Tuner
P.C
Board
ATKZ-48A
|
LED
P.C
Board
ATKZ-
48B
Counter
P.C
Board
:
ATKZ-17
Antenna
Switch
P.C
Board
ATK-2063
2]
ee