Aiwa AD-1800 User manual

Type:
Recording track system: 4-track, 2-channel
Circuit:
Power source:
Power consumption:
Frequency response:
SN ratio:
Wow & flutter:
Tape speed:
Recording system:
Erasing system:
Rewind time:
FF time:
Usable cassette tape:
Motor:
Head:
Input:
MIc:
SPECIFICATIONS
Hi-Fi stereo cassette tape deck LINE (iN):
with Dolby system and DNL
DIN (IN):
1 IC, 62 transistors, 43 diodes,
2 FET, 3 LED Output:
“EE” model LINE (OUT):
AC 110 ~ 120V/220 ~240V
switch changeable, 50/60 Hz
“UK” model
AC 120V/240V switchable 50 Hz DIN (OUT):
24W
LH tape, 30 ~ 14,000 Hz
Fe-Cr tape, 30 ~ 18,000 Hz Headphone:
CrO,
tape,
30
~
17,000
Hz
Dimensions
(w.h.d):
65 dB (Doiby NR/DNL ON, Fe-Cr Weight:
Accessories:
tape)
0.05% (WRMS}
4.76 cm/sec. (1-7/8 ips) 1.0%
AC bias
AC erase
95 sec. (w/ C-60)
95 sec. {w/ C-60)
C-30, C-60, C-90, (C-120)
AC hysterrisis synchronous motor
Ferrite guard head (FGH)
Max. input sensitivity: 0.25 mV
Impedance: 200 ohms ~ 10k ohms
Set using ISO screws
DATE OF ISSUE 25/12/1975
Max. input sensitivity: 50 mV
Impedance: 100 k ohms or higher
Max. input sensitivity: 0.1mV/k ohm
Impedance: 2.7 k ohms
Standard output level: 0.775V (O VU)
Optimum load impedance: 50 k ohms
or higher
Standard output level: 0.775V (O VU)
Optimum load impedance: 50 k ohms
or higher
Load impedance: 8 ohms
423 x 152 x 295 mm (with dust cover)
7.5 kg (with dust cover)
Dust cover x1
Tape cassette x1
DIN cord x1
Head cleaning pole x1
© The external design and the specifications are subject to
change without prior notice.
e@ Dolby Noise Reduction Circuit Under License from
Dolby Laboratories
Incorporated.
e@ The word ‘Dolby’ and “‘Double-D” symbol are trademarks
of Dolby Laboratories Incorporated.

MODEL
AD-1800EE,UK
AIWA
DISASSEMBLY INSTRUCTIONS
1.
To
Remove
Wooden
Cover
5.
To
Remove
Dolby-NR
Circuit
Board.
(1)
Remove
six
screws,
(1)
through
(6).
(1)
Pull
off
the
Dolby-NR
circuit
board.
(Refer
to
Fig.
1}
(Refer
to
Fig.
4)
6. To Remove DNL Circuit Board
(1) Pull off the DNL circuit board.
{Refer to Fig. 4)
Dolby NR Circuit Board
Dolby NR Circuit Board Sy
2.
To
Remove
Chassis
i"
<
Fig.
4
>
(1)
Pull
off
the
six
control
knobs.
(7)
REC/PB
Circuit
Board
(2)
Remove
six
screws,
(1)
through
(6).
(Refer
to
Fig.
2)
7.
To
Remove
Auto-Stop
Detectron
Circuit
Board.
{1) Remove two screws, (1) and (2).
(Refer to Fig. 5)
8. To Remove Auto-Stop/CrO, Switch Circuit Board
(1) Remove one screw (1).
(Refer to Fig. 6)
3. To Remove Jack-1 Circuit Board
(1) Remove three nuts ((1) through (3)) and unsolder lead 9. To Remove FF/REW Muting Circuit Board
of capacitor (4). (Refer to Fig. 3) (1) Remove two screws, (2) and (3).
(Refer to Fig. 6)
4. To Remove Rec./Pb Circuit Board
(1)
Remove
three
screws,
(5)
through
(7).
@
FF/REW
(Refer to Fig. 3) Muting circuit board
Auto
stop/
Cr02
switch
circuit
board

AIWA
MODEL AD-1800EE,UK
10. To Remove Switch/Volume Circuit Board
(1) Remove sixteen screw, (1) through (16).
(Refer to Fig. 7)
11. To Remove LAMP Circuit Board
(1) Remove one screw, (1).
(Refer to Fig. 8)
12. To Remove Meter Circuit Board
(1) Remove two screws, (2) and (3).
(Refer to Fig. 8)
13. To Remove Bias Osc Circuit Board
(1) Remove two screws, (4) and (5).
(Refer to Fig. 8)
14.
To
Remove
Stop
Muting
Circuit
Board
(1)
Remove
one
screw
(1).
(Refer
to
Fig.
9)
15. To Remove LED Circuit Board
(1) Remove two screws, (1) and (2).
(Refer to Fig. 10)
16. To Remove Counter Lamp Circuit Board
(1) Remove four screws, (1) through (4).
(Refer to Fig. 11)
< Fig. 11 >
17. To Remove Motor Circuit Board
(1) Remove two screws, (1) and (2).
(Refer to Fig. 12)
18. To Remove Jack-2 Circuit Board
(1) Remove the nut and washer (1).
(2) Remove six screws, (2) through (7).
(Refer to Fig. 13)

MODEL
AD-1800EE,UK
AIWA
Low level peak lamp lights
High level peak famp lights
NEW CIRCUIT DESCRIPTION
+7
2. Point Peak Indicators Since VU meter cannot follow,
indicated level is lower than actual.
—_
e@ Peak indicator circuit diagram
B +3
>
®
® od
ao
a
i:
=
BH
VU
meter
~
indication
Inadequate
damping
produces
higher
—_—
LEVEL
indicated
value
than
actual.
Input
waveform
TRi METER
" : Time —> .
af a . < Fig. 15>
e@ Recording Level Settings According to Tape
4—+ Distortion can be suppressed to below 3% and optimum
LED(L) LEDIM) recording performed by setting the recording levels as
® ry - 14 Bi follows.
HIGH ; F
cae
Ri
LOW
LH
Tape:
Lights
occasionally
at
+3dB;
does
not
light
at
TRS Re | +7dB
TR , Fe-Cr Tape: Lights often at +3dB; lights occasionally at
© = +70B
a
\
wy
ss
i
6
CrO2
Tape:
Does
not
light
at
either
+3dB
or
+7dB
i T I
Pr |seRe Zo i Ra |
Input and output level distortion characteristics
< Fig. 14 >
Presently employed VU meters are capable of indicating
continuous wave signals of approximately 300msec. They
are incapable of following faster pulse type signals however,
resulting in an indicated value considerably lower than the
actual! jevel. Thus if the recording level is set in reference to
the VU meters, an instantaneous high level input can cause
an over level, resulting in distortion.
Peak indicators are provided for preventing this situation
and are capable of indicating to about Imsec instantaneous
inputs. Earlier single point designs (a single peak indicator
which lights at +6VU) however, were ambiguous and
difficult to interpret. The indicator was not supposed to
light, but if it did not light, the level could not be
determined.
The 2 point peak indicator system employed in the
AD-1800 represents an improvement over earlier systems.
Two peak indicators are used with different lighting levels
(42.5~3VU and +6~7VU), allowing more accurate peak
indication.
@
Circuit
Description
ia)
Output level (dBm)
Distortion (%)
20
3 5 7
. gy |
Input
signal
(1)
is
amplified
approximately
10dB
by
TRt.
Dput
level
(dB)
<
Fig.
16>
Previously, it passed from (2) through the SFR and was
rectified and connected to the meter. However, since the
meter load is heavy, TR1 output voltage became varied by
SFR adjustment, preventing connection to the peak indi-
cator circuit.
TR2 is therefore inserted at that point as an emitter
follower, reducing meter amplifier output impedance in
order not to influence meter and peak indicators.
The signal to the meter amplifier is divided at (3). The peak
indicator signal is rectified at (4) and the voltage is applied
to SFR2. At this point the signal from the other channel is
mixed, while the peak indicator lighting level is determined
by adjusting SFR2.
When (6) reaches a specified voltage, TR3 and TR4
Darlingtons become on, and LED (L) lights. C1 is inserted
at this point to provide a certain degree of lighting time,
since instantaneous lighting with a pulse signal input would
be difficult to observe.
The voltage at (6) is divided at R3 & R4. By a higher level
than TR3 on level, TR5 and TR6 become on. R1 and R2
are inserted as protector resistors to control the current
flow through the LED.

AIWA
MODEL AD-1800EE,UK
=
Hall
IC
Tape
End
Detector
Circuit
In
order
to
remedy
the
drawbacks
(noise,
life,
maintenance,
etc.)
of
earlier
mechanical
contact
type
tape
end
detectors
(G.
switch
and
reed
switch),
a
magnet
and
Hall
IC
are
employed
in
the
AD-1800.
Previous
automatic
stopping
circuit
(|
®
; G.SW
|
| ~—
d+ ©
|
t
| GSW
| !
©
I
ic
1 AD-1500
oe
4600
@| Hall IC
1
Ring
magnet
Oh
AD-1800 < Fig. 17 >
e Automatic Stopping Circuit Diagram
When
a
magnetic
field
is
applied
at
right
angles
to
the
current
flow
in
a
Hall
element,
an
emf
(Hall
voitage)
becomes
generated
at
right
angles
to
the
magnetic
field
and
current
flow.
As
the
output
of
the
Hall
element
is
smail
(0.3V
at
|
=
20mA,
B
=
1000
Gauss),
the
AD-1800
element
is
incorporated
into
an
1C
amplifier
(more
than
2.5V
at
Icc
=
13.5mA,
B
=
350
Gauss).
< Fig. 18 >
Hall element
e@ Operating Description
The
waveform
at
point
(b),
shown
in
Fig.
19,
pertains
to
previous
automatic
stopping
circuits.
An
identical
waveform
can
also
be
obtained
from
a
ring
magnet
and
Hall
IC.
Six
magnetic
poles
are
provided
at
the
outer
circumference
of
the
ring
magnet,
producing
more
than
500
Gauss
at
2mm
from
the
outer
circumference.
The
magnetic
flux
pattern
through
1
rotation
of
the
ring
magnet
is
shown
in
Fig.
21.
Approx. 2mm
OFF OFF
+8
Ring
Peas
Hall
IC
|
|
ON
| |
)
vs
Point (b) waveform
<
Fig.
19>
<
Fig.
20
>
Circuit
board
x
2.
28
Oke
flux
5
PA
;
25
1
rotation
23
<Fig.21>
The flux variation through ring magnet rotation (coupled
with counter pulley rotation) imparted to the Hail IC
results in an output as shown in Fig. 22.
Zz 4
+ ®
> 3D
es 2
Sf
6 8. O8b=-2 fase
Transistor on level
< Fig. 22 >
lf this voitage were applied directly to TR1 base, the
transistor on and off times would differ, since the voltage is
2V even with 0 magnetic flux. R1 and R2 perform dividing
in order to equalize on and off times. TR1 collector output
voltage waveform (at b) becomes the waveform applied to
(b).
e@ Hall iC Handling Cautions
The Hall element is located within the IC as illustrated in
Fig. 23. If the magnet position becomes disturbed, or its
distance increased, the IC output declines. Caution is
therefore needed.
2:5
12.0
1. Vee
2. Output 1
3. Output 2
4. GHD
| 2 3 4 < Fig. 23>
Specified position is approximately 2mm from magnet.

MODEL
AD-1800EE
,UK
AIWA
ADJUSTMENTS
= = =©Mechanical Section
1. Thrust Adjustment
1) Turn thrust screw to move flywheel assembly vertical-
ly to obtain 0.2~0.3mm thrust. (Refer to Fig. 27}.
“ Thrust screw
0.2~0.3—
< Fig.27 >
2. Pinch Pressure
1} With set in play mode, apply 500g cylindrical tension
gage to pinch lever center. Press slowly and measure
pinch pressure when pinch roller separates from
capstan. (Refer to Fig. 28).
Rating: 400 +50g
< Fig. 28>
3. Pause Timing
1) Press FWD button for play mode, then slowly press
pause button. Observe stopping times of take up reel
hub and pinch roller rotations.
2) If pinch roller quickly separates from capstan, while
tape is running, adjust by bending pause lever in
direction B.
3) If pinch roller separation is delayed and tape winds
onto pinch rojler without take up reel hub rotation,
adjust by bending pause lever in direction A. (Refer to
Fig. 29).
Pause lever
Lock plate
< Fig. 29>
— Pinch lever spring
Supporting Plate Assembly Adjustments
Damper Adjustments
1) Screw damper shaft assembly fully into damper sup-
porting plate assembly (Refer to Fig. 30).
2) When damper shaft assembly is turned 2 rotations
clockwise, observe that shaft pin becomes positioned
toward square hole of supporting plate (Refer to Fig.
31}.
3) If shaft pin is in range A, turn counter-clockwise to
adjust; if in range B turn clockwise (Refer to Fig. 32).
Damper supporting plate assembly
< Fig. 32>
4-2 Supporting Plate Adjustment
Supporting plate
5.
1) Lock pin of tape selector lever should engage with
chrome lock plate when cassette elevating plate raises
during eject. Loosen supporting plate screw and adjust
by moving in A-B direction. Adjust so that lock pin
spacing from right side of chrome plate square hole
becomes 0.3~0.4mm (Refer to Fig. 33).
Chrome lock plate
< Fig. 33 >
Motor Pulley Thrust
1) Adjust by raising or lowering motor pulley so that
space between pulley rim and motor becomes 1mm
(Refer to Fig. 34).
Motor pulley
Driver
Motor
< Fig, 34 >

AIWA
er
eee
6. Tape Running
1)
Adjust
so
that
tape
does
not
contact
tape
guide
when
running (Refer to Fig. 35).
2)
{f
tape
contacts
upper
portion
of
guide
(Fig.
36).
move
adjusting
nut
in
direction
A
(Refer
to
Fig.
38).
3)
If
tape
contacts
lower
portion
of
guide
(Fig.
37),
move
adjusting nut in direction B (Refer to Fig. 38).
<
Fig.
35
>
<
Fig.
36>
<
Fig.
37
>
Adjusting nut
< Fig. 38>
7. CrO, Lock Plate
1)
Confirm
that
CrO,
lock
plate
separates
from
tape
selector
lever
when
cassette
elevating
plate
is
in
1/2
range.
2)
If
it
fails
to
separate,
adjust
by
turning
CrO,
lock
plate
adjusting
screw
clockwise
or
counter-clockwise
to
obtain
separation
in
the
1/2
range.
Apply
screw
locking
compound
after
adjusting.
(Refer
to
Fig.
39)
Cassette elevating plate
Tape selector lever
——CrOz lock plate
< Fig. 39 >
8. Tape Speed
3kHz +1%
Use a standard test tape, TTA-111A (3kHz) or equivalent.
9. Wow and Flutter
0.05% (WRMS) at PB
Use a standard test tape, TTA-11A (3kHz) or equivalent.
10, Take-up Torque
40 ~ 60g-cm
11.
FF
and
Rewind
Torque
90
~
1609-cm
12.
FF
and
Rewind
Time
90
+10
sec.
(at
C-60
cassette
tape)
13.
Automatic
shut-off
Time
4
+1
sec.
MODEL AD-1800EE,UK
CYCLE CONVERSION
Conversion Steps
1. Observe that POWER switch is OFF and AC cord
unplugged from power outlet.
2. Turn the set upside down, take out 3 screws from the
motor cover, and remove the motor cover.
3. Disengage belt from motor pulley and temporarily
position it on the motor fan securing screw.
4. Take out 2 motor pulley setscrews and remove motor
pulley.
5. Turn motor pulley upside down and reinstall it with
setscrews.
6. Engage belt on lower portion of motor pulley.
7. — Install motor cover.
e The thicker side of the motor pulley upward is for
60 Hz operation, while for 50 Hz operation, the
thinner side of the pulley should be upward.
50Hz —e 60Hz

MODEL AD-1800EE,UK
ADJUSTMENTS
ELECTRICAL SECTION
Preparations for Adjustment
Required Equipment
e@ Low frequency oscillator (signal generator}
e@ Variable resistance attenuator
e VTVM
@ Oscilloscope
e Resistors: 6002, 100k2, 27k2, 5.6k2
e Test tapes: TTA-117E/TTA-161/TTA-119D (CrO2)/TTA-
119E (FeCr)/TTA-119A (LH)
Adjustment Cautions
1) Before adjusting, clean heads, capstan and pinch roller
with gauze moistened in alcohol.
2) Demagnetize record/play head with head eraser.
3) Thoroughly demagnetize adjusting driver.
4) Set playback volume to maximum.
5) Except where otherwise indicated, set DOLBY-NR
and DNL switches to OFF, employ MIC jacks for
input and LINE OUT for output.
6) Standard inputs (OdB = 0.775V)
MIC Jack: 65dB
LINE-IN: 20dB
7) Connect 100k load resistor to LINE-OUT.
@ Main Component Locations
LIO4 = LIO6
Se pe
PLAYBACK ADJUSTMENTS
1. Azimuth
TAPE SELECTOR: CrO2
Play 10kHz portion of test tape TTA-117E (CrO2) and turn
azimuth adjusting screw to obtain maximum output from
left and right channels.
Do not rotate screw more than 1/4 turn.
After adjusting, apply locking compound to screw.
2. Playback Frequency Response
TAPE SELECTOR: CrO,
Play test tape TTA-117E (CrO2) and adjust high frequency
trimmer resistor SFR101 for equal outputs at 1kHz and
10kHz. In the same manner, adjust SFR102 for the right
channel.
Rating: 1kHz~10kHz flat
3. Level Meters
With set in record mode, apply 400Hz +25dB signal. Adjust
LINE IN volume for 580mV output from TP-3,
Adjust meter trimmer resistor SFR201 so that level meter
indicates the Dolby mark, In the same manner, measure
TP-4 and adjust SF R202 for the right channel.
4. Playback Level
TAPE SELECTOR: LH
Play test tape TTA-161 and adjust playback output
trimmer resistor SFR103 so that level meter indicates the
Dolby mark, In the same manner, adjust SFR104 for the
right channel.
RECORDING ADJUSTMENTS
1. Bias Trap Coil
TAPE SELECTOR: CrO,
With set in recording mode, adjust trap coil L107 for
minimum voltage at test point TP-5. In the same manner,
measure TP-6 and adjust L108 for the right channel.
2. Dolby Trap Coil
TAPE SELECTOR: CrO2
With set in recording mode, adjust Dolby trap coil L101 for
minimum bias leakage to LINE OUT. In the same manner,
adjust 102 for the right channel.
3. Bias Current
TAPE SELECTOR: CrO,
With set in recording mode, adjust bias current trimmer
TC701 for 2mV (200uA) voltage at test point TP-1. In the
same manner, measure TP-2 and adjust TC202 for the right
channel.
Rating: 2mV (200uA)

AIWA
4.
Record/Piayback
Frequency
Response
a
ar
~
We
L206
¢
L
202
:
3
L205
203
L20l
1)
CrO,
TAPE
SELECTOR:
CrO,
Test
Tape:
TTA-119D
Apply
500Hz
(—25dB)
signal
via
LINE
IN
jack
and
adjust
line
volume
for
77.5mV
output
at
LINE
OUT,
Record
5OOH2z
and
SkHz
signals
on
test
tape
TTA-119D
and
play
back.
Confirm
that
the
1kHz
level
is
within
+0.5dB
in
respect
to
the
500Hz
level.
If
the
5kHz
level
is
higher,
set
the
bias
current
higher
than
amv.
lf
the
SkHz
level
is
lower,
set
the
bias
current
lower
than
amv
Perform
adjustment
in
the
same
manner
as
described
in
Step
3
Bias
Current
adjustment.
Record
and
play
back
500Hz,
5kHz,
10kHz
and
15kHz
signals.
Adjust
CrO,
hi
peaking
coil
L201
so
that
with
respect
to
the
500Hz
signal,
5kHz
and
10kHz
become
within
+0.5dB
and
15kHz
within
+1dB.
In
the
same
manner,
adjust
L202
for
the
right
channel.
2)
Fe-Cr
Test
Tape:
TTA-119E
TAPE
SELECTOR:
Fe-Cr
Record
and
play
back
with
TTA-119E
test
tape
as
described
for
CrO2
in
step
1.
If
results
are
not
within
ratings,
adjust
as
follows.
Playback
Level
(1kHz
ref.)
Connection
|
Bias
Voltage
5kHz
level
higher
(1)
Increases
5kHz
level
lower
Decreases
Short
one
of
the
circuit
patterns
among
1~3.
Record
and
play
back
500Hz,
10kHz
and
15kHz
signals.
Adjust
FeCr
hi
peaking
coil
L203
so
that
with
reference
to
the
500Hz
level,
10kHz
becomes
within
+0.5dB
and
15kHz
within
+1dB.
In
the
same
manner,
adjust
L204
for
the
right
channel.
3) LH-NORMAL
Test Tape: TTA-119A
TAPE SELECTOR: LH-NORMAL
Record
and
play
back
with
TTA-119A
test
tape
as
described
for
CrO,
in
step
1.
If
results
are
not
within
ratings, adjust as follows.
Playback Level (1kHz ref.)
Connection | Bias Voltage
Increases
5kHz level higher
5kHz levei lower
Decreases
Record
and
play
back
500Hz
and
10kHz
signals.
Adjust
LH
hi
peaking
coil
L205
so
that
with
reference
to
the
500Hz
level,
10kHz
becomes
within
—1.5
+1dB.
In
the
same
manner,
adjust
L206
for
the
right
channel.
1)
2)
3)
5.
MODEL
AD-1800EE,UK
Record/Playback Level
CrO,
Test Tape:
TAPE SELECTOR:
TTA-119D
CrO2
With set in recording mode, apply 2kHz 77.5mV signal.
Record and play back this signal on TTA-119D test tape.
Adjust CrO recording current trimmer resistor SFR205 so
that playback level becomes 77.5mV +0.25dB. In the same
manner, adjust SFR206 for the right channel,
Fe-Cr
Test Tape: TTA-119E
TAPE SELECTOR: Fe-Cr
Employ TTA-119E test tape and perform the same opera-
tion as for CrOz above. Adjust SFR207 for the left
channel, and SF R208 for the right channel.
LH-NORMAL
Test Tape: TTA-119A
TAPE SELECTOR: LH-NORMAL
Employ TTA-119A test tape and perform the same
operation as for CrOz. Adjust SFR 209 for the left channel,
and SFR210 for the right channel.
Peak Indicator
With set in record mode, apply 1kHz —27dB signal, Adjust
LINE IN volume for OVU indication on level meter. Set
attenuator to —21dB (level meter indicates +6dB) and turn
the peak indicator trimmer resistor SFR203 to the point
where the red peak indicator just extinguishes.
Next set attenuator to —20dB and confirm that red
indicator lights. Vary attenuator in the —24dB area and
read the value at the point where yellow indicator just
extinguishes.
Rating: —25dB +1.5dB
SFR20}
SFR202
MPX Filter
With set in record mode, apply 19kHz signal to LINE IN.
Adjust LINE IN volume for 0.77V at LINE OUT. With
MPX filter switch of Dolby NR ON, adjust MPX filter coil
L105 so that 19kHz signal becomes less than —30cB. !n the
same manner, adjust L106 for the right channel.

MODEL
AD-1800EE,UK
DOLBY NR ADJUSTMENTS
e Main Component Locations and Connections
o™
«-_™
SFR303 SFR301
(3049) (302)
OOLBY-NR
CIRCUIT BOARD
PB
ee lS am
—* AM o
P ‘
REC/PB : Bei 1
o
REC $
OPEN oP VTVM
GATE
oc2av
!
oo 0 O-
SHORT
ON
DOLBY-NR eel Ie
pe
OFF
1) Remove Dolby NR circuit board from set and connect
as shown in drawing.
2) Turn SFR301 (302) and SFR303 (304) fully in the
directions shown by arrows.
3) Position switches as follows.
REC/PB: PB
GATE: OPEN
DOLBY-NR: OFF
4) Apply 400Hz signal and adjust attenuator so that
output becomes 7.6mV, then read attenuator value.
Rating: —49dB +1dB
5) Set REC/PB switch to REC and confirm output level
difference of +0.25dB. Next at frequencies of 100Hz,
1kHz and 10kHz, confirm an output level difference
of +1dB.
6) Position switches as follows.
REC/PB: PB
GATE: SHORT
DOLBY-NR: OFF
7) Apply 5kHz signal and adjust attenuator so that
output becomes 7.6mV, then read attenuator value.
Rating: —49 +1dB
Next set DOLBY-NR_ switch to ON and adjust
SFR303 (304) for 2.4mV output.
8) At the above (step 7) condition, set GATE switch to
OPEN and adjust SF R301 (302) for 3mV output.
9) After adjusting, apply locking compound to trimmer
resistors.
GIG. GEN
10
AIWA
ELECTRICAL MEASUREMENTS
PREPARATIONS FOR MEASURING
Required Equipment
® Low frequency oscillator
® Variable resistance attenuator
® Oscilloscope
® 6002 and 100k2 resistors
® Distortion meter
® Wow meter
@ 1kHz bandpass filter
@ Test tapes: TTA-116/TTA-114/TTA-119D (CrO,)/TTA-
119E (Fe-Cr)/TTA-119A (LH)
Connection
WOW METER
MIC. JACK
S!IG.GEN ATT
<~—
LINE OUT
100KQ
Bandpass filter eM
Measuring Cautions
1) Before measuring, demagnetize rec/play and erase
heads with head eraser and clean heads with gauze
moistened in alcohol.
2) Set playback volume to maximum.
3) Standard inputs (OdB = 0.775V)
MIC jack 65dB
LINE-iIN 20dB
4) Connect 100k load resistor to LINE OUT.
Playback Output
Play test tape TTA-161 and measure output level.
Rating: 1.03V +0.5dB
Recording/Playback Distortion
Apply 400Hz signal via MIC jack and adjust attenuator for
OVU indication on set VU meter. Record this signal on test
tape and measure playback distortion.
Ratings:
TAPE
Test T
ers SELECTOR
Distortion
TTA-119D (CrO tape)
TTA-119E (Fe-Cr tape) | Fe-Cr
‘| TTA-119A (LH tape) LH-NORMAL |} Less than 1.5%
Less than 2.5%
Less than 1.0%

AIWA
MODEL
AD-1800EE,UK
nn
3.
Recording/Playback
Frequency
Response
Channel
Separation
Apply
1kHz
signal
via
MIC
jack
and
adjust
attenuator
for
TAPE
SELECTOR:
LH-NORMAL
75mV
at
LINE
OUT.
Read
the
input
level.
On
test
tape
Apply
1kHz
signal
via
right
channel
MIC
jack
and
adjust
record
60Hz,
100Hz,
1kHz,
10kHz,
and
15kHz
signals
in
attenuator
for
OVU
indication
on
set
VU
meter.
Record
sequence
and
play
back.
With
1kHz
level
as
reference,
and
play
back
with
TTA-119A
test
tape.
Measure
left
measure
each
frequency
level
deviation.
channel
leakage
level
with
respect
to
the
right
channel
Ratings:
output
level.
Measure
playback
level
through
1kHz
band-
Frequency
Test Tape
TTA-119D
TAPE TAPE
SELECTOR | SELECTOR
CcrO, Fe-Cr
=
+2
60Hz 3 dB
Test Tape
TTA-119E
Test Tape
TTA-119A
TAPE
SELECTOR
LH-NORMAL
100Hz
1kHz
10kHz
15kHz
12.5kHz
For LH-NORMAL, measure at 12.5kHz instead of 15kHz.
pass filter.
Rating: More than 30dB
Crosstaik
TAPE SELECTOR: LH-NORMAL
Turn tape over and measure right channel leakage level with
respect to right channel output Jevel of signal recorded for
channel separation measurement (step 6 above). Employ
bandpass filter.
Rating: More than 60dB
Doiby NR Effectiveness
TAPE SELECTOR: LH-NORMAL
Play test tape TTA-114 and measure DOLBY NR switch
ON level difference with respect to DOLBY NR switch
OFF level.
Rating: —4 +1dB
DNL Effectiveness
install test tape and set for playback mode, then set for
pause. Measure noise level difference with DNL switch ON
4 Recording/Playback S/N in respect to noise level with DNL switch OFF.
Apply
400HZz
signal
via
MIC
jack
and
adjust
attenuator
for
Rating:
More
than
3dB
OVU indication on set VU meter. Short input and record
with no signal. Play back and measure ratio between signal
and no-signal portions.
Ratings:
TAPE
SELECTOR
DOLBY-NR OFF| DOLBY-NR ON
S/N (dB) S/N (dB)
j$——— —
CrO2
Fe-Cr
LH-NORMAL
Erase Efficiency
TAPE SELECTOR: CrO,
Apply
1kHz
signa!
via
MIC
jack
and
adjust
attenuator
for
OVU
indication
on
set
VU
meter.
On
test
tape
TTA-119D,
record
signa!
decreased
by
+10dB
of
this
attenuation
value.
Rewind
half
the
recorded
portion,
set
recording
volume
to
minimum
and
erase.
Play
back
tape
and
measure
signal
and
erased
portion
levels.
Measure
playback
level
through
a
1kHz
bandpass
filter.
Rating: —65dB
11

MODEL AD-1800EE.UK
AIWA
SCHEMATIC DIAGRAM—OSC UNIT
2SA841
2SC 1000
28C373
|
1001
©)
e@---
}--—-—----
©
ToT
r4
2SC828 28C 1364 2SA763 2SA684 2SC536 280234 2SA628
Pitta
aaa
1N60
181212
18655
XZ315
TLG105
SLP314
1B2C1
18221
M8513
RD7.5E
SLP114
12

MODEL AD-1800EE,UK
AIWA
BLOCK DIAGRAM
EQ/MIC
AMP]
10;
241041106
y
REC
NF
O
LINE VR
RP
Js
DIN
REC/PB
EW
POWER
SUPPLY
AUTO
STOP
CIRCUIT
TR5O1,502,50
L103
FILTER
4
$4-3
Lios
DOLBY UNIT
OUTPUT
AMP
ONL
UNIT
TRIIZ,II9
183120
QUTPUT VRj
84-477
DOLBY NI
[
°
ap]
|
DIN
OUT
{H.P_AMP
REVEL
REC AMP
RUNNING
IND.
CIRCUIT]
TR504
SFR205|
BIAS
@
MUTING CIRCUIT
TR906,907
SFR207
pie
S-r209
:
V
|
|
4
SFReot
VU
METER
Cd
E
PEAK
IND
PEAK
IND
©
TR209,211
al
210,212
a
%y
@
AC
1Il0~I20V-220~240V
50 / 60Hz
$2-3
S3-5
METER
CASSETE
COUNTER
RECORD;
Cro2
@®
DESCRIPTION
POSITION
DESCRIPTION
4
REC/PB
PB
(So
|
DIN
OUT
LEVEL
>
EQ
LH
sio|
PAUSE
ga.
BIAS
LH
Sit
|
MEMORY
y
DOLBY-NR
OFF
|
Si2}
COUNTER
DNL
OFF
REW
CrO2
AUTO
LH
CASSETTE
sTOP
MUTING
|
STOP
POWER
FF/REW
MUTING
|
PLAY
Si¢
|
VOLTAGE
SELECTO!
13

AIWA
MODEL
AD-1800EE,UK
SCHEMATIC
DIAGRAM,
DOLBY-NR/DNL
©
K t
Q fa} fo ™) oO
Ae i
R303 120K
No
Na
= > O
aw
R30! 68K
i
R403 270K
R401 ISOK
MY
E
K)
\
SOY
ar
ee,
(3V]
O,7Vvl
R305 1.8K
TR30l
R309 3.3K
2SC828R
D401,
403,
405,
407,
409,
411
M8513A-0
R425 22K
R429 5.6K
HIETV}
C409
_
R421
1500P@)
330K
C413 680P(S)
R417 680K
R419 3.9K
D409
R433 120K
ve (o}
t
a
KR
<4 a
R413 15K
R437
C419
270K 4700P
co)
R405 1.69K0
1.8K
R439
220K
c415 0022) | D4II
C417 0,022) Cent]
R411
R415 180K
R423 680
R427 680
R431 68K
TR40!
TR403
TR405
TR407
2SC828R
2SC828S
2SC828R
2SC828R
14
R357 i20K
Cs) R359 2.7K
R363 15K
Be
N 3
R3It 33K BO
R3I5 180K
R319 27K
R325 2.7K
R327 33K
R351 10K
R
R353 33K
R355 47K
R36! 47 C327. 0.1Q
R369 270K
R373 220K
C335 {00/16
TR303 TR305
TR307
FET3O!
TR309
TR3II
TR3I3
2SC828R
2SC828S
2SC828S
2SK
30D
2SC828R
2SA628F
2SC828S

AIWA
SCHEMATIC
DIAGRAM
TR105 2SC 1000-GR
TRIO! 2SA84I-BL TRIO32SCIOOO-BL TRIO72SC536-EF
= Ril9_ 620K RI43
6 Zz 4.5¥] = ~
o 4 BE™ 123 2.2/5
= BS cioe RII7 240K pe a
vl 2 R103 100 &a| 150P (NU) TO2V tsi 8
= x 254—O) Bas o Mic
© Qe ra 0.8V 2-7 SFR IOI
ro)
©.
=|2
ae
50K-
=
© 8 Ke rol o =
Se oF, vt [Se o® gx
53 © ei} | atau en 08! 8 §s8e 14/8 &
Ba. S 1 | Shsonnulpeg 4 3 Sia” aa
—
Tha
\2V
ne
Hh
S|
Bel
-7e
&
)
=
9
rs
Sill
Ox
BF
Fe en
ex
oe
¢ 3| |S 2@Pre a- & oo] Ge
3° 38 <a - 18
g
ves
g|@
2
ollars
ci
38
2
ye
_ w | —_
oT © 8 B =| |732 ocos@fa |= mr
RPM Rios 10 19 = & Bzo
is)
a
Q
cii7 Cla 8
_ 330P© 0.012 @) si-5 ©
“Sie 81-3 REC. eels = si-9
Rais 22k|B1
x
4 [OIN REC/PB 8 8
: = | c201 2 o
Nn
yea g
i ocean =] Oe 8.0
1 Ss| 238 aa
nN OFNG ary fre)
ko
et]
Sif}-
y+
&
a
©
sl-21
set
WERK als ¥ | £203 |losvy s 3 54 ore
3 a 2 l47/25 Fie = 3 2 22
= 53 C207 39P5 3m WO °
So & Oro e
3 OSC UNIT
i R-ch
ea “=, TR2012SC 1000-BL g
3 J 20
x 87-3
TR202
(R-ch)
we MIC
MIC-R ©
nN
2
8
TRio2
=
=TRIO4
TR106
TRI08
«
R104 x
>
(R-ch)
Sst TR9012SD234-Y
u6 —_
LINE IN
ea
i
.
oF
R90!
Teov
204
i 10 /2w
F2 200ma"T S500
90! iB2cl_ x
ic feceratag Fi | ory 300V
$ gz R906
cy 85 Te Bs 8 [K072)
Oa |! +S
S15 ro} ao l+ Nt 0
O-O7LO S24 $8 $s
‘ Oh Oy B-T as
C7 200mé u| °SiI- Sl 68
bad cas oO
AC II0~120/220~240v 2
50/60 Hz F3 630mA"T" 3
D501 as Su
a 3 B= 8 oss
Yeo eS 2 3x : D505
N
\ M p+r-@®® F123 3 eX 8 isi2i2
S' | cv08 5 0 & | R504 10K
16/50 [4/80 Bo ro
m
50Hz @® +y- Bs SS
i 60Hz ® C802 33/16 R50R 2 POR
F4 1A MK un
PL-5.6.7.8 METERx2, CASSETE, COUNTER
TR501
2SA684-R
TR5022SC945LP
TRs032SC945L-P
TR5042SC945L-P
15
TR2032SC 1000-BL TRI09 2SC 1000-BL
MODEL AD-1800EE.UK
TRiu2SC828A-Q TRIZ2SCB828A-Q TRIIS2SC 1364-7
1K R223 5.6K R179 100(1/2W)
RY x x x .
th = =
| [LINE7OIN ni4s 22M Tae S ai 8x 8 Eo € 82 ba
R221
100K
mo
L105
a”
|cl49
22/25
|&
oF
=~
|CI59
10/35
= 22Vf) ths L103 36mH 23mH 8 -- © 5 ®
aL
R
I,
Va
DOLBY-NR
cia7™
|
Eavt]
+™-lox
aes
ee
J3
(PHONES!
Bg
PE
=
g
\
UNIT
0.47/50
‘an
[ory
tS
oav
= ~ log
e8icl+fac
ott
EX)
joe!
C14!
G
2
8)
~
+
lia
&
te
Ti01
;
=3 BAY x {So o| x {3991 3000P 3 Lav 8x o2v S =
attor {3 sel Slat f'@ 2 +18 FA x {9s |e orig 8
& can be ae oF” go nN -lo © Spx nx Hs Ox REG ox 6 R-ch
47, Sling z|/ 6 S t + Oe oy SOFr i = sz @
730 & 8 ele 08 rs 3) iz ga2 ale aS ae a a
@ ty bo bax x %. £ R273
q
Bb
ben.
3
ees
#88
F880
go
[BURG
LyS
820
x
a
se
Q
<x]
oR
x
S52°S)!
'r9D)
10
xi
8
re
rg
s
w[
jee.
¥sik
ens)
29
LO
$7-l
e ° oO é + a arp iN 'S a
2 “ g 8 @2 |e7-|F a @ Slee ® a DIN OUT 4
oe
q
a
©
& 5 $4-3 saa] 1S] JE] IS] |e as [Ql al = 8 &
© a
a
=
No
©
x ba 7 eo orl s z
$3-3
os
co}
68
28
908°
OF
v7
TREO! sI-13 go] 3 $1-15 I-17 $9-2 LINE OUT
28D227-R
1
@b&
AF
Sol
SN
el
LEFT
nN
R709 1.8K Kate x 85-3 cS) S6-5 TR207 ROT
m
R703
|
R706
LH
5
eal
$2-4
2SC828A-Q
LEVEL
ADJ
560
|
470
ee
s
pe
a
ONL
UNIT
TR?
2SCIZ64-7_
TRus2SA763WL5
|
-
--——
—-
-—
—---|-t-|-
-
2s
-
--
----
rm x °o x“ fo) '
R704] “RIOT Si 8k Sa | fe) RS SRKe
680
|
5
R259
=
ey
8
&
M3
ev>
o
56K 2 x s|- O lx
R705 | R708 S5-| fe ‘ But ! am * a 3av BES og |
9 820 | 680 S3-4 16! ces OFS 0.47/50| els =
31 B3 y (4725 390P© | © | ¥ ; c223 SY. « 8
R702 ° 6 x PRY Tsk = | 47/25 |fisev i6.0v x x ‘ o & | LM201
Hy 2 ' + a +
R701
33
g
5
=
RS
es
8
8]
88
ete
Bi
a
:
4
N
oo.
‘=
wo ao arn 4 ig
”
atts
TR2052SC
1364-7
201.203
INGO
g|-2
(OUT
PUT
|
Ce
Sige
ee
ea
1
ras
)
0205
a
|
ligisss
yolt
~
pais D214
H
0207
|
TRils TRi2zo os J TR209 MBS | _SuP-3i4_—_ SLP-114 PS | eae
eicia (R-ch) g f Ig _| Real 10K TRzIO TR2II £32 |
1 IX traiz[ers|r jx |
1 ols ae Ni 5 |
i
NZ:
n|7
:
|
D4 6 \ Xi R243 56K O |- zs. Seltt NS] Fs
TReO2 1 Lb 86 Soy = |
i)
TR204
TRIO
DOLBY-NR
1
cso
ean UNIT \ TR 209.210.211.212 2SC 1364-7 |
s
(R-ch)
I
1
| Lm2o2
1 1
|
TR206
TR208
t
i
; R-ch) f ie
Oe pe eee Re ae a ee a i
2) EXT TR6042SC 1364-7 TRil2 TRIG TRII6
16.2V)
ae ey (R-ch)
“
3osREos
go
060!
i
a old g xO} 35 LINE OUT
eS N N
+418
De
M8513
RIGHT
= a a =" A-O
on ae) gs
& og tT $120 S14
ce] N
R5i2
L.OK(\/2w)
S23
$3")
SWITCH
SIO
PAUSE
(OFF)
. iS a REC/PB( PB) Sil MEMORY (OFF)
SESE Sor soe aly | Ren ° sl S6-3@,0 TAPE SELECTOR EQ(LH) a: eewlioce
' c
c505. ©" }-We Sorse | ol x 5 | TAPE SELECTOR BIAS(LH) Sl4 CASSETTE DETECTION (OFF)
47/16
|
2
ll!
8%
s7-5
—
x
DOLBY-NR
(
OFF)
SIS
POWER
(OFF)
yh 2 Hal O4b Fa Sere DNL (OFF) SIG VOLTAGE SELECTOR(220~240w)
22K | © i wx loo \sg LS %7.6 0509 Y ps0" 082-4 ee, CrOz AUTO (LH) VOLUME
isiai2
|
ax
ee
Z
009...
100-1
J"
idp-1¥
_
STOP
MUTING
(STOP)
VRIOI.102
MIC
gem f 3 a FF/REW MUTING ( PLAY) VR 103.104 LINE /DIN
basses rs D510 WZ-052 RECORD(CrO2) La sp (ONL) PL-3 DIN OUT LEVEL (OUTPUT) VR 105.106 OUT PUT
R506 120K IC501 DN83i 0507 TLG 10S pel pag] |S [+ £
sts 3B 0508 10D-!
lo
fo} oO
16

AIWA
1800EE, UK
MODEL AD-
WIRING
Tso0i(PT)
©
+ @ CHASSIS
> @) EARTH
BLK
SRN
BL
BLK
CIRCUIT BOARD)
e
oO
nde
oe
a
|S
a
ca
_~
Fs
oF
fm
a8,
ef
e@€9
io
og
uv
S
:
coe
Oa
Eg
a2z=od
oees
VOSt
Qos
A
OLS5
aD
&
it
6
“l@|
S|
El
S|
2
MO]
O}
co}
mM)
a}
@
|
Co
|
Zz
e
a
ies Ken
a
|
as
Qa
(ca
<t
te)
a
a
li
ro
ve
&
“el
O
oO
SOs
oy
iw
oe)
ul
ea
Be
es
CH/VOLUME
RCUIT BOARI
(
a
ines
t
1
}
SW
(
BOARD)
“B
IRCUIT.
.B
ETER
ME
{
Oa
Me
CIRCUIT
BOARD)
VOL
BOARD )
PCB-J
(JACK-2 CIRCUIT
Nye
gay
a
iw
ea
PCB-C
( JACK-| CIRCUIT BOARD)
NYG
PC.B-A
(REC/PB CIRCUIT BOARD)
GRY.
BRN
BRN
R
RED
BRN
18
hs —

AIWA
MODEL
AD-1800EE,
UK
WIRING
BLK» @ cHASsis
@ EARTH
BRN
T90i(PT)
BLK AS
> ©
BRN
BLK
BRN.
PUL
BLU
D CIRCUIT
|
|
I
PCB-S
‘
fay
y
a
2
o)
\
£6
ee
2
@
(2
|yae
a
=)
O®
iy
oO
28
€9@
EO
Ng
Ww
oO
(
a
5a
ee
a9
ona
OF
gy
Lok
Oo
rs
GLS5
aD
&
ato
Fa
saeeionioscenens
BOARD )
Le
Le
joo
&
Z/elOG
a
lo
oO
Ww
ia
b
Sect
Lc
OR
Cc
EON
Oe
aI
OD
Re
TE
CITES
Nerocuce
Q
ia
ws
o5®
To
mor
G2?
ae
Loa
Ox
EO
=
wo
(SE
EE
CIRCUIT BOARD)
(BIAS OSC
WH
CUIT
| (LAMP CIR
PCB-d
ACK-2 CIRCUIT BOARD
}
i)
(
CHASSIS
EARTH
»(6)
BLK
H
I
t HASS
EART
aL
Cc
101
oO
7 aoa | --—
NYO
PCB-C
CIRCUIT BOARD) Jo
a
ia
JACK-|
i
{
\
PC.B-A
C/PB CIRCUIT BOARD)
co
KY.
f
\
18
7

MODEL AD-1800EE,UK
AIWA
WIRING
Dso7
\
Ss
(REW)
SOL 501
CIRCUIT BOARD)
(FF/REW MUTING
GRY
)
PLe (COUNTER LAMP
r
1
P/CrO2
PC.B-0
(AUTO STO
|
RCUIT BOARD
WITCH C
Ss
3
1
i
qx“ag
oy
a
Coos
a: a
a:
ia
x
4
3
E LAMP)
CASSETT
i
|
|
|
\
a
og =O
1m
po
|
fe
se
:
SWS
©).
|obe&
aso
5
oO
i
| |
freee
1
i
| /
ORG
A
c.8
"UK" MODEL
SE aes) eer eee
WHT/BLK
Siz
(VOLTAGE ;
SELECTOR)g (
POWER)
240V |
19

MODEL
AD-1800EE,UK
AIWA
REC/PB
CIRCUIT
BOARD
6a OLY
Ole)
3
z
g
$
a
3
|
:
©
a
3
z
eS
re
L
le
e
[
5
j
:
“
25
ie
=
i
:
5
@
3
2
a
i
——
3
.
3
5
: :
:
UG
So
os
a
r—)
PS
=
=
2
g063
Bi o
oa
i
:
al
S
es
beet
ee
:
069
3%
sosy
:
he
:
ee
|
38
:
8
£069
L618 8.
va ee : iS
Et. o 3s
pe
EMU
de
|
93
begt
yy3 0
O45
2069
: £O6u
‘ 3
ae
06a
fe
8
& SI
Le
5
=
éL
8
ee
ee
5
:
1o6y
bos
FA
a
mio
:
oO
is
+4—
a
x
Z
:
a
z
;
S
(ee
]
Hi
att
>
s
¢
2
1069
2
S
BLK
ie) (es)

MODEL AD-1800EE,U K
AIWA
DOLBY-NR
CIRCUIT
BOARD
+
:
:
ay
-
Ee
a
E
a
mas,
2
gf
Ne
Sx.
nt
10¢9
DNL CIRCUIT BOARD
BIAS OSC CIRCUIT BOARD