Sony TA-2000F User manual

-TA-2000F
Section Title Page
SERVICING NOTES ...0000.......c:cccsssseteeecsseeeseeeeeres ]
1. TECHNICAL DESCRIPTION
1-1. Technical Specifications ............c..6. 2.
1-2. Detailed Circuit Analysis ............. 3~8
1-3. Block Diagram ................ceceeseeeeeeeeeeees 9
1-4. Level Diagram .............cccccceeeeseeeee sees 10
2. DISASSEMBLY AND REPLACEMENT
PROCEDURES
2-1. Tools Required ............ cess eceeeseoee eee 11
2-2. Hardware Identification Guide ....... 11
2-3. Top Cover and Front Panel
Removal .......ccccccseceeeesseseceseeeeeeees 11
2-4. Front Subchassis Removal .............. 12
2-5. Level Meter and Meter Lamp
Replacement ......... eee eeeceeee eee eee 12
2-6. PC Board Removal ...............00 12~13
2-7. Rear Panel Removal ............ccceeeeees 13
2-8. Control! and Switch
Replacement .............ccseeeeeeee 13~14
2-9. Replacement of Components
Secured to the Rear Panel
by Rivets oo... eee eeeceeeseeeeeees 14
2-10. Chassis Layout 0.0.0... seeceeeeeeeee 15
3. ALIGNMENT AND ADJUSTMENT
PROCEDURES
3-1. Test Equipment Required ............... 16
3-2. Power Supply Voltage
Adjustment seen eet idazs 16
3-3. -Overall Check Preparation .............. 17
3-4. Sensitivity Measurement ................. “97
3-5. Level Meter (VU meter)
Calibration ............cscssseeeeees 17~18
3-6. Rated Output Measurement ............ 18
3-7. Harmonic-Distortion
Measurement ...........sesscessseeeneeeeee 18
TABLE OF CONTENTS
3-8. Frequency Response
Measurement ...............00seseees 18~19
Section
Title Page
3-9. Noise Level Measurement bie waves 19
3-10. Tone Control Check .............0. 19~20
3-11. Filter Response Check .......cccecee 20
3-12. Crosstalk Measurement ................00 20
DIAGRAMS
4-1. Mounting Diagram
— “A” PCB: PHONO-1 Equalizer
Amplifier/Head Amplifier
Board ~— viieeeeessssceeceneeeeeereres 22~23
4-2. Mounting Diagram
— “B’ PCB: MIC Amplifier/
PHONO-2 Equalizer
Amplifier Board — .............. 24~25
4-3. Mounting Diagram
— “C” PCB: Flat Amplifier-1/
Flat Amplifier-2 Board — ..... 26~27
4-4. Mounting Diagram
— “D” PCB: Meter Amplifier/
HEADPHONE Amplifier
Board — o...eeeessssseseceeeseeeeee 28~29
4-5. Mounting Diagram
— “E” PCB: Muting/Power
Supply Board — ............e 30~31
4-6. Mounting Diagram
— “F” PCB: REC OUT Amplifier/
High and Low Filter Com-
ponent/ Turnover Frequency
Changeover Component
BO ard Bie ictecagctetesndeess
4-7. Mounting Diagram
— “G’ PCB: OUTPUT LEVEL
Changeover Switch Board — ....... 34
4-8. Schematic Diagram ................ 35~36
REPACKING uu... eecec ccs eceeeecesnnenerentenenes 37
EXPLODED VIEW ............ccsseseeeeeee 38~41
ELECTRICAL PARTS LIST .............. 42~47

-TA-2000F
SERVICING NOTES
The
FET’s
used
in
the
TA-2000F
are
selected
according
to
their
Idss
rank,
so
use
replacement
FET’s
with
the
exact same Idss rank.
Idss
rank
is
indicated
by
the
identification
number,
as
shown
in
Fig.
A.
On
all
plug-in
type
PC
boards
except
the
MUTING/POWER
SUPPLY
board,
left-
and
right-channel
conductor-
side
patterns
are
designed
symmetrically.
This
makes
a
trouble
check
possible
through
interchange
of
channels
by
reinserting the boards upside down.
or
lot voltage * lot Idss rank
number ldss rank number
Fig. A | Example of Idss rank

TA-2000F
SECTION 1
TECHNICAL DESCRIPTION
1-1. TECHNICAL SPECIFICATIONS (LOW : greater than 50dB
Technical
specifications
for
the
TA-2000F
are
LEVEL)
(weighting
given in Table 1-1. network B)
PHONO 2 : greater than 73 dB
TABLE 1-1. SPECIFICATIONS , (weighting
‘ network A)
e : +
Frequency PHONO-1, 2: RIAA curve +0.5 dB MIC ‘renter shan s0dB
response: MIC : 30Hz to 30kHz ichti
+9 dB (weighting
network B)
TUNER, TUNER
AUX 1, 2,3 :
mapneie 3 10Hz to 100kHz AUX 1, 2, 3] greater than 90 dB
> 40 TAPE 1, 2 (weighting
REC/PB 42 dB
; REC/PB network A)
(input) (input)
Input sensitivity PHONO-1 =: 1.2mV 33k Tone contole +10dB at 50Hz
and impedance: (HIGH LEVEL) 47k : (TURNOVER
os ve FREQ. 250 Hz)
(LOW LEVED 0.06mV 10 ohm AS$ +10dB at 100 Hz
30 ohm (TURNOVER
PHONO-2_ : 1.2mV_.s 47k FREQ. 500 Hz)
MIC :0.5mV_ 100k ; +10dB at 10kHz
TUNER
(TURNOVER
AUX
1,
2,
3
FREQ.
2.5
kHz)
eee TREBLE
TAPE 1,2 $110mV_ 100k +10dB at 20kHz
REC/PB
(TURNOVER
(input)
FREQ.
5
kHz)
Maximum input PHONO-1 Filters: LOW: 12dB/oct, below 50Hz
capability: (HIGH LEVEL) : 300mV HIGH: 12 dB/oct, above 9 kHz
(LOW LEVEL) : 1I5mV Harmonic Less than 0.03% at rated output,
PHONO-2 > 300mV distortion: 1 kHz
MIC :1,200 mV
IM distortion: Less than 0.05% at rated output
Signal output OUTPUT :1V 3k (60 Hz:7 kHz = 4:1)
level and 1, 2 :0.3V 6k
impedance: REC OUT :100mV_ 10k : Power
{2 (max 30V) consumption: 23 watts
‘CENTER :5V 2.6k Power 100, 117, 220 or 240V ac,
HEADPHONE : 0.5V requirements: 50/60 Hz
OUT (8 ohm load)
REC/PB : 30mV 82k Dimensions: 400 mm (width) x 149mm
(output) (height) x 315 mm (depth)
1534,” (width) x 51346" (height) x
Signal-to-noise PHONO |! 1274" (depth)
ratio: (HIGH : greater than 73dB ;
network A) Shipping weight: 11.2kg (24]b 120z)

1-2. DETAILED CIRCUIT ANALYSIS
The following text describes the function or
operation of all stages and controls. The text se-
quence follows signal paths. Stages are listed by
transistor reference designation at the left margin;
major components are also listed in a similar manner.
Refer to the block diagram on page 9 and the
schematic diagram on pages 35 to 36.
Stage/Control Function
PHONO-! Equalizer/Head Amp
Head Amplifier Amplifies extremely small input
Q101 signals (as from a moving-coil
type cartridge) to the level re-
quired at following equalizer am-
plifier.
A common-gate configuration is
suited to this job because it has
low input impedance and high
voltage gairi. Input signal ap-
plied to the PHONO-1 terminal
is routed to this amplifier only
when IMPEDANCE SELECTOR
switch $10 is set to the 30 ohm
or 10 ohm position.
IMPEDANCE $10 changes the PHONO-1 input
SELECTOR impedance to meet the cartridge
switch S10 manufacturer’s recommended
load impedance because of its
effect upon frequency response.
Equalizer Ampli- This newly developed direct-
fier coupled four stage amplifier am-
Q102, Q103 plifies the phono cartridge signals
Q104, Q105 to the level required at the input
Q106 of the following tone-amplifier.
Q102 forms a conventional FET
amplifier while Q103 and Q104
act as buffer amplifier which has
a high input impedance.
This FET-PNP combination am-
plifier forms a modified source-
follower circuit in which Q104
acts not only as constant-current
source, but also as a drive am-
plifier for the negative-going half
cycle. This has the advantage of
low harmonic distortion and
wide dynamic range. In addi-
tion, the FET generates less
noise than a conventional silicon
transistor.
Stage/Control
lot voltage
number
Fig. 1-1.
Bias circuit
Equalization
circuit
‘TA-2000F
Function
The FET’s used in TA-2000F are
selected according to their Idss
rank, and care should be taken
to use replacement FET’s with
the exact same Idss. Idss is
indicated by the identification
number, as illustrated in Fig. 1-1.
Note that Q105 and Q104 are
newly developed high-voltage
transistors which make the wide
linearity (dynamic range) pos-
sible. For this purpose, a 150-
volt power supply is employed.
lot ldss rank
Idss rank number
Example of Idss rank
De bias voltage for Q102 is
determined by the current flow
in source resistor R112, and the
dc negative feedback voltage ap-
plied to the gate of Q102 from
the emitter circuit of Q105
through R110, R107 and R109.
This. dc negative feedback tech-
nique provides stable operation.
De bias voltage of Q103 is de-
termined by the drain voltage
of Q102 and the current flow
in the Q103 (which is restricted
by its Idss). Current flow in
Qi03 also determines the bias
voltage applied to the Q104 and
Q105 as they are directly cou-
pled.
RIAA equalization is achieved
by the negative-feedback loop
containing R117, R118, R119,
C110 and C109. Be sure to use
replacement components with
the exact same values. The
equalizer amplifier’s output is
fed to the FUNCTION-2 switch
through R120 (1 k{&2) to prevent
interaction between the left and
right channels when the MODE
switch is set to L + R.

Function
switches. Note that the TAPE-
TO-TAPE positions in the FUNC-
TION-1 switch are provided for
tape duplicating as noted in
Table 1-2.
TABLE 1-2.
FUNCTION-1 Tape Tape
Position Recorder-1 Recorder-2
TAPE-TO- ‘
TARE : as ieee -
TAPE 21 eae
Stage/Control Function
MIC Amplifier /PHONO-2 Equalizer Amplifier Section
MIC Amplifier The MIC amplifier consists of
Q301, Q302 two pairs of FET-NPN amph-
Q303, Q304 fiers. They amplify the signals
provided by the microphones to
the level required at the input
of the tone-amplifier.
An FET has high input imped-
ance and generates less noise
than conventional silicon tran-
sistors. Therefore, FET’s are
employed in the low-level am-
plifiers. Note the high-voltage
Stage/Control
TAPE 2-1
Bias circuit
MIC amplifier
Q303, Q304
MIC LEVEL
control VR6
mixing switch
$15
PHONO-2
Equalizer
Amplifier
Q305, Q306
Q307, Q308
Q309
Function switch
transistor Q302 (Q304) employ-
ed in the second-stage amplifier.
This eliminates distortion due
to strong input signal causing
saturation in the low-level am-
plifier.
Dc bias voltage for Q301 is
determined by the current flow
in the source resistor R306, and
the dc negative feedback voltage
applied to the gate of Q301
from the emitter circuit of Q302
through R304 and R302.
Q303 and Q304’s operation is
the same as described in Q302
and Q303. Note that the last
stage (Q304) is a conventional
transistor since the high-level
input signal is sufficiently at-
tenuated by means of MIC
LEVEL control VR6 so as not
to saturate Q303 and Q304.
The MIC LEVEL control and
mixing switch S15 are mecha-
nically connected to perform
the mixing operation.
Same as described in PHONO-!
equalizer amplifier section ex-
cept for reference numbers.
Note that the output of this
amplifier can be controlled by
means of VR1, LEVEL ADJUST.
Input signals applied to the
TAPE-1, TUNER, AUX-1, AUX-
2 input terminals are controlled
respectively by means of VRS,
VR2, VR3 and VR4.
All input signals are routed to
FUNCTION-1 or FUNCTION-2
REC OUT
Buffer Amp
Q01, Q51
MONITOR
switch S3
MODE switch
BALANCE
control VR7
All input signals are equalized or
controlled by means of equalizer
or LEVEL ADJUST resistors,
and then fed to the FUNCTION
switches.
The signals for REC OUT are ex-
tracted from the signal path be-
tween the FUNCTION switches
and MODE switch, and then fed
to each set of REC OUT termi-
nals through buffer amplifier
(emitter follower) QO1. QOl
eliminates interaction between
the tape recorder and the
TA-2000F’s signal path. Note
that QOl’s output is routed
through muting relay REL-1.
In the TAPE-1! position, input
signals connected to either the
TAPE-1 terminal or REC/PB
connector is selected. In the
TAPE-2 position, the input pro-
gram connected to the TAPE-2
terminal is selected. In the
SOURCE position, all other pro-
gram sources are selected.
Selects the desired mode of
operation. This switch may also
be used for test purposes. The
relation between the positions
of the MODE switch and out-
puts of the set are summarized
in Table 1-3.
Input signal is routed to the
BALANCE control through
MODE switch $4. This is done
to optimize stereo reproduction.
To eliminate insertion loss at

Stage/Control Function
the
mechanical
center
of
move-
ment,
a
special
potentiometer
having
a
conductive
coating
over
half its element length is used.
VOLUME
The
balanced
input
signals
from
control
BALANCE
control
VR7
is
fed
VR8
to
VOLUME
contro!
VR8,
which
regulates the signal applied to
the following tone-control cir-
cuit or output circuit.
Tone Amplifier Section
This three-stage amplifier has
basically flat response, and pro-
vides 20 dB voltage gain to com-
pensate for tone-control insertion
loss. It also isolates the volume-
control and tone-control circuits
to eliminate mutual interference.
The input signals are amplified
by Q501 and Q502, and then
applied to source follower Q503.
Bias voltage for Q501, Q502
and Q503 is determined by the
current flow in their respective
source resistors. Negative feed-
back is applied from the source
circuit of Q503 to the source
circuit of Q501 through C505,
R509, and C506 to obtain a
flat and wide response. Tone-
amplifier-1’s output is fed to
an RC-type tone-control circuit
through TONE CANCEL switch
S5 when S5 is set to “ON”.
Tone Amplifier
Q501, Q502
Q503
Bias circuit
TONE CANCEL
SW SS
Ly ey telele) s
Stage/Control Function
Tone Control Section
All inputs are applied this circuit
when TONE CANCEL switch
S5 is set at ON. Fig. 1-2 shows
the simplified circuit of tone
control incorporated with the
treble and bass turnover switches.
TREBLE control
' $6
Increases or decreases the
amount of high-frequency com-
ponents by switching the resis-
tors connected to S6 in steps.
TREBLE
TURN-
S8
selects
the
specified
turn
OVER
FREQU-
over
frequencies’
(2.5
kHz
or
ENCY
switch
5
kHz).
Refer
to
Fig.
1-3.
BASS
control
Increases
or
decreases
the
S7
amount
of
low
frequency
com-
ponents
by
switching
the
resis-
tors connected to S7 in steps.
R1110k
To
TONE CANCEL
sw
BASS
Control
SW S7
Q SW
TREBLE
Control SW
Sé
flat amplifier-2
a=)
Simplified tone control network
Fig. 1-2.
TABLE 1-3. OUTPUTS
L-CH
L+R
POSITION OUT
STEREO L+R
L+R L+R
rh
L
L+R
CENTER
HEADPHONE
RECOUT-1,
2,
MOE
E
SCE
CHANNEL
OUT;
REC/PB
OUT;
Lise
aa
tee
[tee
[ier]
tee
|
ae
a
L+R L+R L+R
L
R
L L R L

Stage/Control
Function
BASS TURNOVER S89 selects the specified turnover
FREQUENCY
switch S9
Tone-amplifier-2
Q504, Q505, Q506
FILTER switch
S11
LOW(50 Hz)
position
frequencies (500 Hz or 250 Hz).
Refer to the Fig. 1-3 (tone con-
trol response).
When TONE CANCEL switch
S5 is set to CANCEL, the line
signal is bypassed around the
tone-control circuit and is fed
directly to the output circuit
through FILTER switch S11.
Same as tone-amplifier-1 except
for reference numbers.
Selects the desired filtering op-
eration. LC filter circuits are
employed to eliminate insertion
loss.
Low-cut filter (C15, LO1) cuts
out unwanted low frequency
components from the input sig-
nals (12 dB/oct below 50Hz).
20 50 100 200 S500 1k 2k 5k
10k 20k
Frequency in Hz
TURNOVER FREQuency:
BASS 500 Hz
TREBLE 2.8 kHz
Stage/Control
OFF position
HIGH (9 kHz)
position
BOTH position
Function
These unwanted low frequencies
include rumble created by the
turntable, record changer, or the
record itself. See Fig. 1-4.
All filter circuits are removed
from signal paths and have no
effect upon frequency response.
High-cut filter (LO2, C16) cuts
out unwanted high-frequency
components from the input sig-
nals (12 dB/oct above 9kHz).
These unwanted high frequencies
include hiss noise created by
tape deck or tape itself. See
Fig. 1-4.
Both low- and high-cut filters
are effective. See Fig. 1-4.
The signal from the FILTER
switch is routed to the OUTPUT
jacks through OUTPUT LEVEL
switch $13.
a
RS
Ny
LR]
Aan
a
=
1
AA
yy
ay
4
ty
Y]
.
22
20 50 100 200 500
Frequency in Hz
TURNOVER FREQuency:
1k 2k 5k 10k 20k
BASS 250 Hz
TREBLE 5kHz
Fig. 1-3. Tone control frequency response
eS ES eal =
BE
5k 10k 20k 50k 100k 200k 500k
50 100 200 500 1k 2k
Frequency in Hz
Output: 1 volt (OUTPUT LEVEL switch set to 1V)
input signal applied to TUNER inputs
TONE CANCEL switch: CANCEL position
VOLUME control: maximum clockwise
FILTER switch: OFF position
BOTH position --------
Fig. 1-4. Filter response

Stage/Control
OUTPUT LEVEL
switch S13
Function
The output voltage can be
changed by Sil, which has
two calibrated positions (0.3V
and 1.0V), and should be set
according to the requirements
of the equipment to be con-
nected. Note that the signal
supplied to the OUTPUT-2 ter-
minal is routed through the leaf
switch in the HEADPHONE
jack. As the result, no signal
will appear at the OUTPUT-2
terminal during headphone mon-
itoring.
Meter
Amplifier/Headphone
Amplifier
Section
METER LEVEL
switch S12
Meter amplifier
Q701, Q702
Q703
Level meter
adj. R701
Headphone
amplifier
Q704, Q705
Q706, Q707
HEADPHONE
LEVEL VR9
Level meter sensitivity can be
varied by switching S12. In
OdB position, the reading on
the meter shows the actual out-
put value. In the -10 (-20)dB
position, the sensitivity of the
meter increases 10 (20)dB up
from the 0dB position. Output
signal is routed to meter ampli-
fier through METER LEVEL
switch $12 to permit VU meter
monitoring. In the MIC posi-
tion, only the MIC amplifier’s
output is fed directly to the
meter amplifier.
This three-stage direct-coupled
amplifier increases the extracted
output signals to the level re-
quired to drive the level meter.
The meter amplifier output is
rectified and supplied to the VU
meter through bridge rectifier
diodes D701 ~ D704.
Semifixed resistor R701 in the
meter amplifier calibrates the
VU meter.
Supplies enough power to drive
the headphone used for mon-
itoring. The output signal is
controlied by means of HEAD-
PHONE LEVEL control VR9.
Q704 is a preamplifier which
increases the input signal to the
level required at the following
driver stage.
Stage/Control
Driver Q705
Power amplifiers
(complementary
stage)
Q706, Q707
CENTER
CHANNEL
OUTPUT jack
Muting circuit
Q907, Q908
Q909, Q910
19 ey Lelele) :
Function
Though this stage is a conven-
tional flat amplifier, it deter-
mines the output voltage swings
because the following stage is
basically in the emitter-follower
configuration. The ac load resis-
tor for this stage is R718 in the
coHector circuit.
These transistors operate as
emitter-followers to provide the
current swings required and also
perform the necessary phase in-
version to drive the load in
push-pull.
Phase inversion is performed by
using PNP and NPN type transis-
tors. Q706 supplies power dur-
ing the positive-going half cycle,
while Q707 supplies power dur-
ing the negative-going half cycle.
The output is fed to the HEAD-
PHONE jack through coupling
capacitor C711.
It also supplied to the CENTER
CHANNEL output jack through
R729 for use in center-woofer
systems. Note that the left- and
right-channel signals are mixed
at this jack.
This muting circuit prevents the
loud ‘‘pop” (due to initial cur-
rent flow) or click noises from
occurring just after turning the
power switch to ON. These
transients might damage a deli-
cate high-fidelity speaker system.
The base of Q909 (Q910) is
connected to the collector cir-
cuit of Q908 through R914
(R913), while the base of Q908
is connected to an RC network
(R910, C902) having a long
time constant. Negative bias
voltage is produced by D907
and C903, and then fed to the
base circuit of Q909 (Q910)
through R912. This effectively
mutes the input signals up to
20V_ peak-to-peak. When you
first turn ON the power switch,
Q908 remains off due to the
long time constant of the as-

TA-2000F
Stage/Control
REC OUT
Muting circuit
Q911, Q912
Function
sociated bias circuit, while Q909
(Q910) is forward biased by
R911. Asa result, Q909 (Q910)
is ON, shorting the output cir-
cuit to ground, and effectively
muting the output signals.
As Q908 is gradually turned ON
due to the slowly-increasing base
current flow, Q908 conducts
and cuts off Q909 (Q910), re-
moving the muting. Q907 is
employed to discharge C902
quickly when power switch is
turned off, preparing it for the
next muting operation.
This circuit is employed to mute
the REC OUT signals by means
of relay REL-1, preventing the
loud ‘‘pop”’ or click noises just
after turning the power switch
to ON. The base of Q911 is
connected to the collector cir-
cuit of Q912, while the base of
Q912 is connected to an RC
network (R903, C901) having a
long time constant. When you
first turn ON the power switch,
Q912 remains off due to the
long time constant of the associ-
ated bias circuit. This keeps
open the muting relay, discon-
necting the buffer amplifier’s
(Q01) output from the REC
OUT signal path. As Q912
is gradually turned ON due to
the slowly-increasing base cur-
rent flow, Q912 conducts and
turns on Q911, energizing the
muting relay to deliver the buf-
fer amplifier’s output to the
REC OUT terminal.
Power Supply Section
Two independent regulated pow-
Stage/Control
Voltage regulator
Q901, Q902, Q903
(Q904, Q905,
Q906)
Function
er supplies are employed to ob-
tain stable operation. One is
a low-voltage supply delivering
37 volts dc, and the other is a
high voltage supply delivering
150 volts dc. As both power
supplies have the same configu-
ration, only the low-voltage
regulator circuit is described
here. The high-voltage supply is
identical except for reference
numbers.
De output from bridge rectifier
D901 and D902 (D903 and
D904) is filtered by C18 (C17)
and applied to series regulator
Q901 and Q902 (Q904 and
Q905).
Q903 (Q906) compares a sample
of the output voltage picked
off across power supply adjust
control R926 (R920), with
reference voltage supplied by
zener diode D905 (D906).
A change in the output voltage
is detected at the base of Q903
(Q906) and therefore alters its
collector voltage. Since the
collector of Q903 is directly
coupled to the base of Q902
(Q905), the change in output
voltage alters the conduction
of Q901 and Q902 (Q904 and
Q905) by the amount necessary
to maintain the output voltage
constant.
An increase in output voltage
causes an increase in the imped-
ance (decrease in conduction)
of Q901 and Q902 (Q904 and
Q905), and vice-versa. The dc
output voltage supplied to the
preamplifier section is therefore
extremely stable.

BLOCK DIAGRAM
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SECTION 2
DISASSEMBLY AND REPLACEMENT PROCEDURES
WARNING
——
Hardware
Nomenclature
Unplug
the
ac
power
cord
before
starting
any
disassembly
or
replacement
pro-
Pan Head Screw
cedures.
Pan
Head
Screw
with
Spring
Washer
2-1.
TOOLS
REQUIRED
Flat
Countersunk
Head
Screw
..
.
The
following
tools
are
required
to
perform
Binding
Head
Screw
disassembly and replacement procedures on the
TA-2000F.
:
Oval
Countersunk
Head
Screw
..
1.
Screwdriver,
Phillips-head
Truss
Head
Screw
2.
Screwdriver,
3
mm
(1/g")
blade
Round
Head
Screw
3. i long-
PHSE, AORE ROS Flat Fillister Head Screw
4. Diagonal cutters
Set Screw
5. Wrench, adjustable
E — Retaining Ring (E Washer)
6. Tweezers
WwW Washer
7.
Soldering
iron,
40
to
50
watts
SW
Spring
Washer
LW Lock Washer
8.
Soldering
iron,
solder-sucker
tip
N
Nut
9.
Solder,
rosin
core
~
Example
—
Type of Slot
® P 3x10
2-2.
HARDWARE
IDENTIFICATION
GUIDE
oe
:
Length inmm(L) 7 T
: : L
The
following
chart
will
help
you
to
decipher
Diameterinmm(D)
;
1.
the
hardware
codes
given
in
this
service
manual.
Type
of
Head
«0
“Di
Note: All screws in this set are manufactured
to the specifications of the International
Organization
for
Standardization
(ISO).
2-3.
TOP
COVER
AND
FRONT
PANEL
This
means
that
the
new
and
old
screws
REMOVAL
are
not
interchangeable
because
ISO
:
screws
have
a
different
number
of
1.
Remove
the
two
machine
screws
at
each
side
threads
per
mm
compared to
the
old
of
the
case
and lift
off
the
top
cover.
ones. The ISO screws have an identi-
fication mark on their heads as shown in 2. Remove all control knobs and levers.
Fig. 2-1. The knobs can be removed by loosening the
slotted set screws and pulling the knobs
straight out. The levers are simply pulled off.
3. Remove the four self-tapping screws (© B 3x6)
jaentitnation securing the front subchassis’s top cover and
Mark lift off it. See Fig. 2-2.
4. Remove the three screws (@PS 4x5) behind
the top edge of the front subchassis as shown
in Fig. 2-3.
5. Remove the three self-tapping screws (® B 3x6)
at the front bottom of the chassis as shown in
Fig. 2-1. 1SO screw Fig. 2-4. This frees the front panel.

pay art si Z |
@PS 3x6
: PCB bracket removal '
Fig. 2-3. Front panel and PCB bracket removal
2-4. FRONT SUBCHASSIS REMOVAL
The front subchassis is the vertical member on
which the controls, switches, and the pilot lamps
are attached,
1. Remove the top cover and front panel as
described in Procedure 2-3.
self-tapping screw ®B 3x6 (front panel removal)
self-tapping screw ®B 3x6
(sub-chassis removal)
@PS 3x6 (PCB bracket removal)
self-tapping ®B 3x6 {rear panel removal)
Fig. 2-4. Bottom view
2. Remove the two self-tapping screws (@ B 3x6)
at each side of the chassis (see Fig. 2-5) and
two self-tapping screws (@ B 3x6) at the front
bottom of the chassis as shown in Fig. 2-4.
This frees front subchassis.
self-tapping screw
@B 3x6 .
er | screw
@®B 3x a
Fig. 2-5. Front subchassis and rear panel removal
2-5, LEVEL METER AND METER LAMP
REPLACEMENT
1. Remove the front subchassis as described in
Procedure 2-4.
2. Remove the four screws (® PS 3x6) securing
the meter bracket to the front subchassis as
shown in Fig. 2-6. This frees the meter bracket.
3. Remove the defective level meter or meter lamp
by loosening the hex nut or prying out the
defective lamp, and then install the new one.
2-6. PC BOARD REMOVAL
Prepare for removing or replacing any of the
PC boards by removing the top cover as described
in Procedure 2-3.
N2.6¢ (LEVEL METER removal)
Fig. 2-6. Meter bracket removal

PHONO-1 Equalizer Amplifier/Head Amplifier
Board
1, Remove the IMPEDANCE SELECTOR knob
by loosening the set screw.
2. Remove the hex nut securing the IMPEDANCE
SELECTOR switch to the rear panel.
3. Remove the three screws (© PS 3x6) securing
the PCB bracket to the rear panel cover. This
frees the PCB.
Plug-in Type PCB
1. Remove the two screws (® PS 3x6) securing
the PCB bracket to the PCB mounting bracket
as shown in Fig. 2-3.
2.
Remove
the
two
screws
(®
PS
3x6)
securing
the
PCB
mounting
bracket
to
the
chassis
from
the
bottom
as
shown
in
Fig.
2-4.
This
frees
the
bracket,
and
now
the
PCB’s
can
be
simply
pulled
out.
REC
OUT
Buffer/High
and
Low
Filter
Component/
Turnover
Frequency
Changeover
Component
Board
1.
Remove
the
front
subchassis
as
described
in
Procedure
2-4.
2.
Remove
the
two
screws
(®
PSW
3x6)
securing
the
PCB
to
the
front
subchassis
as
shown
in
Fig.
2-7.
OUTPUT LEVEL Changeover Switch Board
1. Remove the rear panel as described in
Procedure 2-7.
2. Remove the two screws (® B 2.6x4) securing
the OUTPUT LEVEL changeover switch to the
rear panel as shown in Fig. 2-8.
Note: This board is directly soldered to the
OUTPUT LEVEL changeover switch.
Fig. 2-7. . PC board removal
hyp xelele) 3
2-7. REAR PANEL REMOVAL
1. Remove the PHONO-1 Equalizer Amplifier/
Head Amplifier Board as described in Procedure
2-6.
2. Remove the two self-tapping screws (® B 3x6)
at each side of the rear panel as shown in
Fig. 2-5.
3. Remove the two self-tapping screws (® B 3x6)
at rear edge of the bottom as shown in Fig. 2-4.
This frees the rear panel.
2-8. CONTROL AND SWITCH REPLACEMENT
Prepare for replacing any of the controls or
switches by removing the front panel and front
subchassis or rear panel as described in Procedures
2-4 and 2-7.
POWER, FUNCTION-2, MONITOR, TURNOVER
FREQ. and TONE CANCEL Switches
1. Remove the two screws securing switches to
the front subchassis as shown in Fig. 2-9.
2. Unsolder the lead wires from the defective
switch, and then install the replacement switch.
Note that the PCB mounted at the back of the
front subchassis should be removed when
replacing the TURNOVER FREQ. or TONE
CANCEL switch.
@B26x4 AC OUTLET rom ssie
a 9
t £
Ra “#
= =
Fig. 2-8. Rear view
FUNCTION-1,
MODE,
FILTER,
METER
LEVEL
Switches
and
VOLUME,
HEADPHONE
LEVEL,
BALANCE,
BASS,
TREBLE
and
MIC
LEVEL
Controls
1.
Remove
the
hex
nut
that
secures
the
defective
switch
or
control
to
the
front
subchassis
as
shown
in
Fig.
2-9.
2.
Unsolder
the
lead
wires
from
the
defective
switch
or
control
and
then
install
the
new
one.

With a soldering-iron having a solder-sucking
tip, clean the solder from each lug of the
defective switch and the printed board as
shown in Fig. 2-10. This frees the switch.
HEADPHONE, AUX-3 jacks 2.
1. Remove the two screws (® PS 3x6) securing the
jack escutcheon to the front subchassis.
2. Unsolder the lead wires from the defective jack,
nd Phen quctall the heer One: 3. Install the replacement switch.
REPLACEMENT OF COMPONENTS
SECURED TO THE REAR PANEL
BY RIVETS
LEVEL ADJUST Controls and MIC Jack 2-9.
1. Remove the ornamental nut securing the
controls or jack to the rear panel. Use pliers
covered with a soft cloth. Take care not to 1. Remove the
rear panel as described in
mar the rear panel.
Procedure 2-7.
2. Unsolder the lead wires from the defective 2. Bore out the rivets using a drill bit slightly
control or jack, and then install the new one. larger in diameter than the rivet. See Fig. 2-11.
IMPEDANCE
SELECTOR
Switch
3.
Punch
out
the
remainder
of
the
rivet
with
a
nail set or prick punch.
1. Remove the PHONO-! Equalizer Amplifier/ ;
Head
Amplifier
Board
as
described
in
Procedure
4.
Remove
the
defective
component,
and
then
1-6.
install
a
new
one.
5. Secure the new component with a suitable
ear
Pye
‘a #
a for x oe
eos: 4 reg Q|
en) Oo pr sO
ere oro CO nae? or”
\ IO aye.
<2
per ds)
<a §
of
Ce Canes
t ‘ Jats 2
mip, . «,
nod n a 0 Lan
Sn QO 8S
oo,
» Meee
screw and nut, or a repair rivet screw (part
number 3-701-402).
/— fear panel
— washer
f
ss
Fig.
2-10.
IMPEDANCE
selector
switch
removal
Fig.
2-117.
Rivet
replacement
,
VOLUME
TR
FUNCTION2
LEVEL
EBLE
cone!
control
move
SW
METER cig es
HEADPHONE BALANCE
jack control
Fig. 2-9.
FREQ. SW
FUNCTION 1
SW,
TURNOVER TURNOVER MIC LEVEL
FREQ. SW SW
(TREBLE)
Control and switch replacement

2-10.: CHASSIS LAYOUT
a
te
ik
il
s
“A” PCB
Note:
“A” PCB:
“B” PCB:
“C” PCB:
“D” PCB:
“E” PCB:
“F” PCB:
“G” PCB:
“G" PCB
PHONO-1 Equalizer Amplifier/Head Amplifier
Circuit Board
MIC Amplifier/PHONO-2 Equalizer Amplifier
Circuit Board
Flat Amplifier-i/Flat Amplifier-2 Circuit Board
Meter Amplifier/Headphone Amplifier Circuit
Board
Muting/Power Supply Circuit Board
REC OUT Buffer/High and Low Filter
Component/Turnover Frequency Changeover
Component Circuit Board
OUTPUT LEVEL Changeover Switch Circuit
Board
iy ty selele)
power
transformer
voltage changeover
block

SECTION 3
ALIGNMENT AND ADJUSTMENT PROCEDURES
3-1. TEST EQUIPMENT REQUIRED
1. Audio Oscillator
Frequency range ............. 10 Hz to 100kHz
Distortion ...........:::ecceeeee 0.03% or less at 1kHz
2. Distortion Meter
Capable of measuring of 0.015% distortion or
less at 1kHz :
Frequency range ............. 20 Hz to 100kHz
Input impedance .. 1!megohm or more
3. Ac VTVM
Capable of measuring rms voltage of 100mV
or less with a frequency range from 10Hz to
100 kHz.
Input impedance ............. 500k ohms or more
4. Attenuator
Capable of attenuating signals 60dB or more.
Characteristic
impedance ............eeeee 600 ohms unbalanced
5. Oscilloscope
Bandwidth ...............cccee 1 MHz or more
6. Dc Voltmeter
Capable of measuring dc voltage of 1SOV and
50V or less.
600 ohm (%4W)
30hm (4W)
Note: 1.When measuring the sensitivity of
the PHONO-1 LOW LEVEL input,
insert a 46 dB pad (shown in Fig. 3-1.)
between the attenuator and input
terminal. The input sensitivity may
be regarded as the reading on the
attenuator plus the pad loss.
2.0dB = 0.775V (r.m.s.)
7. Resistors
attenuator
Fig. 3-1. 46dB pad
3-2. POWER SUPPLY VOLTAGE ADJUSTMENT
Check the power supply voltages before starting
any measurements and readjust them if necessary.
Preparation
1. Remove the top cover as described in Procedure
2-3 and connect the dc voltmeter to the test
points as shown in Fig. 3-2.
Procedure
1. Set the variable transformer for minimum
output.
2. Turn the POWER switch to ON, and then
increase the line voltage up to the rated value.
3. Adjust semifixed resistor R920 (high-voltage
regulator) and R926 (low-voltage regulator) to
obtain 150V and 37V readings respectively
on the meter.
ae
SOCKET
E
—150V
de
———
WwW)
7
6
6 4
ar
R
a
09
iy
6
SX
mz
=
test
poin
rest
point
nig
ae
nes
BRS
ais
sscrne
carci
TRANSFORMER
(SECONDARY
POWER
TRANSFORMER
|
ExMourt
‘
eee
|
ji
"
es
ELECTROLYTIC
CAPACIT
18
@xMourted
on
croesis}
Fig. 3-2.
B Muting /Power Supply Board
| Meter Amp/Headphone Amp
De ou connections
Flat Amp: 1 /Flat Amp- 2
it
Je
eave ae Calibration |
Oe CH)
MIC Amp/ |
PHONO-2
Equalizer
Amp
meee A926 lB R801{R-CH)
‘es (37 Vdc) @ Level Meter Calibration
Fig. 3-3. Parts location

3-3.
OVERALL
CHECK
PREPARATION
Unless
otherwise
specified,
set
all
controls
and
switches
as
follows
to
prepare
for
the
following
checks:
VOLUME control .............. maximum position
MODE switch ...............0+ STEREO
MONITOR
switch
..............
SOURCE
MIC
LEVEL
control
........
MIXING
OFF
FILTER switch ........0..0. OFF
TREBLE control ............. 0 (dB)
BASS control wo... 0 (dB)
TONE switch oe CANCEL
TREBLE TURNOVER
FREQ. switch ........... 2.5 kHz
BASS TURNOVER
FREQ.
switch
............
$00
Hz
METER LEVEL switch ..... 0 (dB)
HEADPHONE LEVEL
(lose
A
0)
re
minimum
level
BALANCE
control
............
mid
position
LEVEL
ADJUST
control
..
maximum
level
(rear panel)
OUTPUT LEVEL switch... 1V
(rear panel)
IMPEDANCE
SELECTOR switch......:. 47k
(rear panel)
TA-2000F
Set the BALANCE control to fully counter-
clockwise (left-channel measurement) or fully
clockwise (right-channel measurement) posi-
tion.
Procedure — Perform this for each input
1.
With the equipment connected as shown in
Fig. 3-4, feed a 1 kHz signal to the input jack.
Adjust the attenuator to obtain a | volt reading
on the ac VTVM. Note that the audio
oscillator’s output should always be kept at
0.775 volts (0 dB).
The reading of the attenuator represents the
input sensitivity and should within the limits
given in Table 3-1.
TABLE 3-1. INPUT SENSITIVITY
SPECIFIED SENSITIVITY
AT 1kHz
INPUTS
PHONO-1 (HIGH LEVEL)
-57 +1dB
*(LOW LEVEL) -82.2 £1.5 dB
MIC
PHONO-2
TUNER, AUX-1, -2, -3 -17.5. £0.5 dB
-57 +1dB
-63.7 $1.5 dB
*
The
PHONO-1
IMPEDANCE
SELECTOR
switch
should
be
set
to
30.9
and
an
additional
attenuator
pad
(See
Fig.
3-1.) used between the main attenuator and input jack.
ees fy
3-5.
LEVEL
METER
(VU
meter)
CALIBRATION
34.
SENSITIVITY
MEASUREMENT
(
;
Preparation
Preparation
:
:
1.
Set
the
FUNCTION-2
switch
to
TUNER.
Set
all
the
controls
as
described
in
Procedure
3-3.
2.
Set
the
BALANCE
control
fully
counterclock-
wise
(left-channel
calibration)
or
fully
clock-
Set
the
FUNCTION-1,
IMPEDANCE
SELEC-
;
; ;
i
:
wise
(right-channel
calibration).
TOR,
and
FUNCTION-2
switches
to
the
position
where
the
measurement
should
be
3.
Set
the
METER
LEVEL
switch
to
OdB.
performed.
ac
VT
VM
or
oscilloscope
distortion
meter
0.775
V
constant
6002.
unbalanced
TA-2000F
(7.
eA
600
2
audio
t
;
out
oiciliator
|
attenuator
|
inoue
put
|
V
|
|
fa
Pace
ee
ss
Fig.
3-4.
Level
check
test
setup

Procedure
1. With the equipment connected as shown in
Fig. 3-4, feed a 1kHz to the TUNER input
jack. Adjust the attenuator to obtain a 1 volt
reading on the ac VIVM.
2. Turn the semifixed resistor R701 (R801), see
Fig. 3-3, mounted on the Meter Amplifier/
Headphone Amplifier board to obtaifi a 0
reading on the level meter.
3. Decrease the input signal level 10 dB (20dB),
and then set the METER LEVEL switch to
-10dB (-20dB) position.
4. Confirm that the reading on the level meter
is 0 + 0.5 VU.
5. Confirm that the reading of the meter changes
with variations in attenuator settings.
3-6. RATED OUTPUT MEASUREMENT
Preparation
1. Set the FUNCTION-2 switch to TUNER.
2. Set the BALANCE control fully countérclock-
wise (left-channel calibration) or fully clock-
wise (right-channel calibration).
3. Set the OUTPUT LEVEL switch to 1V.
4. Set the HEADPHONE LEVEL control to maxi-
mum level position.
Procedure
1. With the equipment connected as shown in
Fig. 3-4, feed a 1kHz to the TUNER input
jack. Adjust the attenuator to obtain a 1 volt
reading on the ac VIVM.
2. Each output level should be within the limits
given in Table 3-2.
TABLE 3-2. OUTPUT LEVEL
Outputs Output Level
CENTER OUTPUT 16.0 +1dB
HEADPHONE OUT (open) 16.0 +1 dB
REC OUT
REC/PB OUT -32 +3dB
1 or 4 to ground
see Fig. 3-S.
3-7. HARMONIC-DISTORTION MEASUREMENT
Preparation
Same as described in Procedure 3-3, except the
TONE switch should be set to ON.
Procedure
1. With the equipment connected as shown in
Fig. 3-4, feed in the signal specified in Table
3-3 and then adjust the VOLUME control to
obtain a 1 volt (r.m.s.) output.
2. Measure the harmonic distortion. The har-
monic distortion should be within the limits
given in Table 3-3.
TABLE 3-3. HARMONIC DISTORTION
Input Signal Harmonic
Level and Freq. Distortion
PHONO-1 (HIGH -18dB, 1 kHz | 0.05% or less
LEVEL) or PHONO-2 -8dB, 1 kHz | 0.1% or less
(at 3 vols output)
*MIC 3 dB, 1 kHz | 0.7% or less
(at 3 vols output)
z +
TUNER, AUX-1, 2, 3 en soo a8; 0.03% or less
*Note: In this measurement, adjust the output
level by means of the MIC LEVEL
control.
3-8.
FREQUENCY
RESPONSE
MEASUREMENT
Preparation
Same as Procedure 3-4.
Procedure — Perform this for each input.
1.
With
the
equipment
connected
as
shown
in
Fig. 3-4,
feed
a
1
kHz
signal
to
the
input
jack.
Vary
the
attenuator
to
obtain
a
1
volt
reading
on
the
ac
VIVM.
2.
Check
the
frequency
response
by
varying
the
‘input
signal
frequency
while
keeping
the
os-
cillator’s
output
constant.
Frequency
response
should
be
within
the
limits
as
given
in
Table
3-4.
Pp L-CH ; : REC
i @ OUT
Fig. 3-5. REC/PB (DIN) connector
—18—