Harman Kardon TD4800 User manual

The Harman Kardon
Model TD4800
Manual 165A
3 HEADS CD TRANSCRIPTION QUALITY CASSE I IE DECK
The following marks found in the parts list of this manual
identify the models as follows.
CD : North America area model
CB : North America area model Black version
o :International model
• : International model Black version
harman/kardon
240 Crossways Park West, Woodbury, N. Y. 11797
1112-3152165A8 P-119012 2000 Printed
in Japan
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www.audiodna.sk

2
SPECIFICATIONS
Track Configuration
• MECHANICAL SECTION
Record/Playback Tape Speed
Drift
4. 75cm/sec.
Wow and Flutter (WTD)
Take Up torque
Back Tension
F.FWD Torque
REW Torque
F.FWD/REW Time
(C-60Tape)
• AMPLIFIER SECTION
Bias Frequency
Playback Output
(Output
VR Max.)
Signal-to-Noise Ratio
at Line Input
(Input 1kHz, 100mV)
IHF-A WTD at Dolby Level (WTD)
Dolby NR off
LN
CrO2
Metal
Dolby B/C NR
LN
Cr02
Metal
DolbyS NR LN
CrO2
Metal
Nominal Limit
4-track 2 Channel Stereo
Cassette Deck
0.2% ;;. 1.0%
0.035% (NAB) ;;; 0.07%
0.06% (CCIR) ;;. 0.12
50gr.cm 35 ~70gr.cm
4gr.cm 2 ~6gr.cm
140gr.cm 70 ~160gr.cm
140gr.cm 70 ~160gr.cm
70sec. ;;; 100sec.
210kHz ± 5kHz
1150mV ± 1.5dB
51dB
54dB
54dB
69dB
72dB
;;:; 66dB
72dB
;;:; 66dB
72dB
75dB
;;:; 68dB
75dB
;;:; 68dB
Channel Separation
Crosstalk
Record/Playback Distortion
(Input 1kHz)
MPX Filter Attenuation
at 15kHz
at 19kHz
LN
CrO2
Metal
Erase Ratio (Input 80Hz)
LN
Metal
Input Sensitivity
(Input 1kHz) at Line Input
Input Impedance
(Input 1kHz) at Line Input
• DIMENSIONS (W x H x D)
•WEIGHT
• POWER SUPPLY
U.S.A. and Canada models
International model
• POWER CONSUMPTION
Nominal Limit
45dB .;:; 35dB
70dB
.;:; 60dB
0.6% ;;; 1.2%
1.3%
;;.2.0%
1.1% ;;;2.0%
0.3dB ;;; 1dB
35dB
;i;30dB
70dB .:; 60dB
61dB
.;:; 56dB
45rnV 30(min) ~ BO(max) mV
22kO 19(min) ~ 30(max) kO
17-3/8" X 5" X 12-5/8"
(443 x 126 x 320 mm)
15.2Ibs (6.9kg)
AC120V, 60Hz
AC220V/240V, 50/60Hz
U.S.A. and Canada models 29W
International model 31W
These specifications are service target specs.
Specifications and components are subject to change without notice.
Overall performance will
be maintained or improved.
LEAKAGE TEST {FOR SERVICE ENGINEERS IN THE U.S.A.)
Before returning the unit to the user, perform the following safety checks:
1. Inspect all lead dress to make certain SIMPSON
MODEL 229 ETC. FOR
LEAKAGE TEST
that leads are not pinched or that
hardware is not lodged between the
chassis and other metal parts in the
unit.
TO EACH EXPOSED
METAL SURFACE OF
UNIT UNDER TEST
.. HIGH 0/. GROUND ..
VOLTAGE LEAD
TO AC GROUND SUCH
AS WATER PIPE.BX CABLE.
CONDUIT, ETC.
2. Replace all protective devices such as
nonmetallic control knobs, insulating
fishpapers, cabinet backs, or shields,
isolation resistor-capacitor networks,
mechanical insulators, etc.
3.
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 AC line cord directly into a 120-volt
AC receptacle (do not use an
Isolation Transformer for this test). Using two clip leads, connect a 1500
ohm, 10-watt resistor paralleled by a 0.15µF capacitor, in series with all
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 volt, 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.)
OR+ LEAD
TEST PROBE
TO EXPOSED
METAL PARTS
1.5kn
10W
0.15µF
CONNECT TO KNOWN
EARTH GROUND
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.
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CONTROLS AND FUNCTIONS
0 POWER SWITCH
Press to turn unit on/off.
@EJECT
Press to load/remove tape cassette.
@MEMORY
Indicates Memory is engaged.
GcouNTER
Indicates tape position in minutes and seconds.
C,INTRO
Indicates Intro Scan is engaged.
• REPLAY
Indicates Replay is engaged.
fjRECPLAY .,._.
Displays operating mode: Record, Play, Rewind or Fast Forward.
C,LEVEL
Shows signal level.
0 TAPE SOURCE
Shows whether deck output is tape playback or source signal.
4tTYPEIIIIV
Automatically indicates type of tape in use.
.DOLBY BC S
Shows if Dolby B, or C or S circuits are on.
f)MONITOR
Press to override Automatic Tape Monitor Switching.
41 INTROSCAN
Previews each segment on a pre-recorded tape.
.RESET
Resets Counter to 00:00.
• SKIP REVERSE/SKIP FORWARD
Locates the start of any desired segment on a pre-recorded tape.
• REPLAY
Press on: when tape reaches end, deck automatically rewinds to
start and begins Play.
• RECORD/PAUSE
Puts cassette deck in Record ready or pause mode.
I} BIAS TONE/BIAS FINE TRIM
Adjusts bias used when recording.
f) REC CAL
Press and hold when adjusting Rec Cal setting.
I) PLAY
Begins playback or recording.
8DOLBY*NR
Activates Dolby Noise Reduction circuitry for playing or recording
tapes.
fisTOP
Stops tape transport in any mode.
fl REC CAL
Adjust when recording using Dolby Noise Reduction.
I) REWIND/FAST FORWARD
Rapidly rewinds or advances tape.
fj METER WEIGHTING
Allows for easy setting of optimum record levels.
C,ouTPUT
Adjusts output level to headphones and receiver/pre-amp/
integrated amplifier.
fl RECORD MUTE
Inserts blank space when recording.
• MPXFILTER
Press when recording FM stereo broadcasts using Dolby noise
reduction.
I) INPUT LEVEL
Adjusts recording level and balance.
@)MEMORY
Press on: when .. is pressed, tape rewinds to approximately 00:
00 on Counter.
@) HEADPHONES
Insert headphone plug.
*NOTE
Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories Licensing
Corporation. HX Pro originated by Bang & Olufsen.
"DOLBY", the double-D symbol
[I] and "HX PRO" are trademarks
of Dolby Laboratories Licensing Corporation.
3
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4
DISASSEMBLY PROCEDURES (REFER TO PAGES 13, 18 AND 19)
[ 1 ) CABINET TOP (133) REMOVAL
Remove 4 screws (A) and 2 screws (B), then remove the Cabinet
Top (133).
[ 2] FRONT PANEL ASSEMBLY (AA) REMOVAL
1. Remove the Cabinet Top (133). (Refer to step 1.)
2. Disconnect connectors (LCN502, LCN503 and LCN505)
connected
to the Dolby NR (REC) P. C. Board (PCB-5).
3. Remove 6 screws (C) and then remove the Dolby NR (REC) P.
C. Board (PCB-5).
4. Disconnect connectors (LCN501, LCN502 and LCN506)
connected
to the Dolby NR (PLAY) P. C. Board (PCB-6).
5. Remove 4 screws (D) and 2 plastic rivets (E), then remove the
Dolby NR (PLAY)
P. C. Board (PCB-6) with Metal Fittings (184
and 185) and Shield Plate (186).
6. Disconnect the jumper lead wire from connector (CN803) on
the Main P. C. Board (PCB-1).
7. Pull out the Input Level knob and remove the hexagon nut (F).
8. Remove 7 screws (G) and then remove the Front Panel
Assembly
(AA) with Front P. C. Board (PCB-2).
[ 3] CASSETTE TAPE RECORDER MECHANISM ASSEMBLY
(105) REMOVAL
1. Remove the Front Panel Assembly (AA). (Refer to step 2.)
2. Disconnect connector (CN105, CN106, CN301 and CN805) on
the Main P. C. Board (PCB-1).
3. Disconnect connector (LCN801 and LCN801) con the P. C.
Board of the Cassette Tape Recorder Mechanism Assembly
(105).
4. Remove the spring (179) and 2 screws (H), then remove the
Cassette Holder (144).
5. Remove the cassette lid open lever (187).
6. Remove 4 screws (I) and then remove the Cassette Tape
Recorder Mechanism Assembly (105).
[ 4] MAIN P. C. BOARD (PCB-1) REMOVAL
1. Remove the Front Panel Assembly (AA). (Refer to step 2.)
2. Disconnect the connectors and unsolder the lead wires
connected to the Main
P. C. Board (PCB-1 ).
3. Remove 6 screws (J) and then remove the Cabinet Back (134).
4. Remove 8 screws (K) and then remove the Pain P .. C. Board
(PCB-1) backward.
POWER CORD REPLACEMENT (FOR SERVICE ENGINEERS OTHER THAN NORTH AMERICA)
In order to prevent fire or shock hazard when replacing the power cord, follow the Procedure below to replace the part with the standard supply
parts.
CABINET BACK
-I
130mm
BLUE
=[J
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INPUT LEVEL
rm
DOLBY NR B/C/S CIRCUIT I I $\/\/ITCHING
I ENCODER BLOCK lo IC501
INPUT O ) Ic1, 101,103,104,105,106,
107, 301, 303, 304, 305, 306,
VR1511152
307, 501
SWITCHING
L---------------+-1 IC602
REC CAL
EQUALIZER
t,E. • I CIRCUIT
0201 -
206
VR903, 904
-,
REC MUTE
0207,
208
------- -- ----------,------- - -- -- -- ---------
13
I I BIAS OSC.I< I BIAS/EQUALIZATION IE----------'''-----------------1
T301 SELECTOR
'
@
BIAS FINE TRIM
VR307
RECORD MONITORING SIGNAL
DOLBY NR B/C/S CIRCUIT
DECODER BLOCK
IC51,551, 601, 603,
604, 605,
606, 607, 801, 803, 804, 805,
806,807
SWITCHING I e ::,f
IC502
METER
DRIVER
IC402
DOLBYNR
LOGIC
CONTROL
BLOCK
IC901
~~~
PEAK LEVEL METER
CAPSTAN MOTOR
REEL MOTOR
SOLENOID
REMOTE SENSOR
t---------~JOUT
REMOTE
t----------u IN
OPERATION BUTTONS
SW901 -906, SW911 -917
Cr02 METAL PLAY REC CASSETTE
DET. DET. PACK DET.
OUTPUT LEVEL
PLAYBACK MUTE
0709 - 711
?MPXFILTER
I i ➔ , ~I •
{ ---,r------Q OUTPUT
0,
I
I
L_ -- --- ----- - - ---------- - - ---- - _l_ ________ - ------- - --- --
'· .•.,., .. ~.;,.:;:--:.;·:;·_,-~,-'°"'r.;-::":-----::~- .. -;:..,..v :.,:~,~..:..~-==---: ................. ~.---....-- --,. , """··•~---.-.,,_.._ •. _,_..,~~ •~·
LINE MUTE
0701, 702
VR901/902 HEADPHONE
AMP.
IC651
? □ HEADPHONES
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6
CIRCUIT DESCRIPTION
PLAYBACK SIGNAL
Signals that are retrieved by the playback head are amplified by
playback amplifiers 0101, 0103, 0105, 0107, 0109, and 0111 (L
ch) and 0102, 0104, 0106, 0108, 0110, and 0112
(R ch). Then,
they are divided into Dolby NR B/C
and Dolby NR S types, and
sent to the Dolby NR circuit where they are decoded. Signals are
sent to the peak level meter circuit via the switching IC502,
and
their levels are controled by the output level controller from which
they are sent to the output jack. The level controlled signals are
simultaneously sent
to the headphone amplifier IC651 where they
are amplified before being sent
to the headphone jack.
RECORD SIGNAL
Signals that reach the input jack are level controlled by the input
level controller. Then, they are divided into recording and record
monitoring signals
and sent to the Dolby NR circuit. After being
encoded in the Dolby NR circuit, the recording signals are
switched by the switching
IC501 and sent to the equalizer circuit
via the Rec Cal controller. The record monitoring signals are
decoded by the Dolby
NR circuit and then processed in the same
manner as the playing signals. After the equalizer circuit, the
recording signals are amplified by a recording amplifier consisting
of 0209, 0211,
0213, 0215, and 0217 (L ch) and 0210, 0212,
0214, 0216,
and 0218 (R ch) before being sent to the recording
head.
DOLBY NR CIRCUIT
The Dolby NR circuit has two blocks, one for processing the
playing signals and another for processing the recording signals.
The block for the playing signals also decodes the record
monitoring signals.
Playing signals processing block
• Dolby NR B/C type
The playing signals are supplied to pin 29 (L ch) and pin 2 (R ch)
of IC551. After decoding, they are sent
to pin 25 (L ch) and pin 6
(Reh).
The record monitoring signals are supplied
to pin 30 (L ch) and pin
1
(R ch) of the IC551 for decoding.
• Dolby NR stype
The playing signals are supplied to pin 41 of the IC603 (L ch) and
IC803 (R ch). They are supplied from pin 37 to pin 2 for low
frequency (LF) processing, and sent out from
pin 43. At the same
time, they are supplied to pin 2 of the IC607 (L ch)
and IC807 (R
ch) via the IC606 (L ch) and IC806 (R ch) for high frequency (HF)
processing. The processed signals are sent out from pin
43 of
these ICs. Signals after
LF and HF processing are supplied to pin
2 of the IC605
(L ch) and IC805 (R ch) via the IC601 and IC604 (L
ch) and
IC801 and IC804 (R ch) for low level (LL) processing. The
processed signals
are sent out from pin 43 to pin 35 of the IC603
(L ch) and IC803
(R ch). Then, they are supplied from pin 34 to pin
39. Finally, they are supplied from pin
37 as playing signals.
Recording signals processing block
• Dolby NR B/C type
The recording signals are supplied to pin 30 (L ch) and pin 1 (R
ch) of the IC501 in the Dolby NR circuit. After encoding, they are
sent out from pin
18 (L ch) and pin 13 (R ch).
• Dolby NR stype
The recording signals are supplied to pin 40 of the IC103 (L ch)
and IC303
(R ch). They are sent out from pin 37 to pin 2 for low
frequency
(LF) processing. At the same time, they are supplied to
pin 2 of the IC107 (L ch) and IC307 (R ch) via the IC106 (L ch)
and IC306 (R ch) for high frequency (HF) processing. After LF and
HF processing, the signals are supplied from pin 43 to pin 2 of the
IC105 (L ch) and IC305 (R ch) via the
IC101 and IC104 (L ch) and
IC301 and IC304 (R ch) for low level (LL) processing. Then, they
are supplied from pin
43 to pin 35 of the IC103 (L ch) and IC303
(R ch). Finally, they are supplied from pin 34 as recording signals.
MUTING OPERATION
The signal that mutes the sound produced at switching to
recording or playback
is applied from IC901 of the logic control
block.
When the "STOP" button
is pressed, the mute signal output from
the pin 28 of
IC901 turns ON 0701 (L ch.) and 0702 (R ch.) to
short-circuit the output signals
of the playback amplifiers for
muting. For the purpose of preventing generation of noise at
power ON/OFF, the mute signal is output from 051. The muting
is
done by short circuiting the output signal with 0701 (L ch.) and
0702 (R ch.) turned ON.
LOGIC FOR RECORD MODE
Pressing the "REC" button puts pin 27 of the IC901 in the "high"
level. This causes the
0709 and 0711 (L ch) and 0710 and 0712"
(R ch) to go on muting signals reaching the Dolby NR circuit.
Since the
0219 goes off at the same time, the 0207 (L ch) and
0208 (R ch) are turned off. This cancels muting of the signals
going to the recording amplifier so that the recording signals are
allowed
to reach the recording head.
SWITCHING FROM RECORD MODE TO PLAYBACK MODE IN
LOGIC
When the "STOP", "PAUSE" or "PLAY" button is pressed, the pin
26 of IC901 becomes high level. 0219 turns ON and 0207 (L ch.),
0208 (R ch.) turn ON to mute the inputs to the record amplifiers.
C
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DOLBY NR S-TYPE TECHNICAL DESCRIPTION
Circuit Operation
Like all other Dolby noise reduction systems, S-type is
complementary, that is, signals are encoded before being
recorded, then decoded
in a complementary manner during
playback. The following discussion will describe the operation of
an encoder, but it should be noted that an encoder can be swiched
to the decode mode in the same manner as an A-type, B-type, C-
type, or SR processor.
As with C-type NR, an S-type encoder has two staggered-action
compressors, each having a passive
main path which is summed
with
an active side chain, and each of which operates over a
different signal level range. The high level stage has three
compressors
in its sidechain, which are known as the high
frequency fixed band (HF/FB), the high frequency sliding band
(HF/SB), and the low frequency fixed band (LF/FB). The
low level
stage has a high frequency fixed band and a high frequency
sliding band. Fixed bands are band limited to provide more
compression at frequencies below dominant signals above 6
kHz,
which gives less signal modulation in the encoder and less overall
noise modulation. The fixed and sliding bands operate together
in
a technique known as action substitution.
The encoder output is filtered
and then fed back to the control
paths of each compressor
to control compressor action using a
technique known
as modelation control.
Spectral skewing
is provided to reduce sensitivity to very low and
high frequency signals. The low frequency spectral skewing
network is located at the encoder input, while high frequency
attenuation
is provided by two high frequency spectral skewing
circuits which are distributed between the low and high level
stages
to reduce compression ratios at high frequencies. Two
stages of antisaturation provide high frequency attenuation at high
levels to reduce tape overload.
An S-type encoder adapts its characteristics to the input signal in
such a way as to provide the maximum amount of boost at all
times, especially at frequencies which are lower
or higher than the
dominant signal. The overshoot suppression (O/S) circuits
used
are also designed to allow maximum boost from the compressor.
Thus, the least treatment is given
to the signal at all times,
resulting
in a very stable output with little dynamic action. When
the signal is decoded, the maximum amount of noise reduction is
obtained in the presence of signals, ensuring low noise modulation
and a
high degree of tolerance to error in the transmissionchain.
Up to 24 dB of noise reduction at high frequencies and 10 dB at
low frequencies is provided.
High Level Stage
The high level stage is active for signal levels in the range from
-25 dB to Dolby level, and provides up to 12 dB of boost at
frequencies above 400
Hz and 10 dB of boost at frequencies
below 200
Hz.
The LF/LB is basically a passive low pass filter followed by a
variable attenuator, with the amount of attenuation increasing with
signal level. The HF/FB is similar, although the variable attenuator
follows a high pass filter. The HF/SB
is a variable frequency high
pass filter whose corner frequency rises with increasing signal
level or frequency (as
in B and C-type processors). The input of
the sliding band is connected
in such a way as to provide an
output which is the sum of the fixed band output and a signal
which
is the difference of the HF/FB output and the input signal
(action substitution).
The control signals are derived from the compressor output, which
is filtered, and averaged to produce a smooth control signal. An
alternate path is provided to quicky charge the control path under
high level transient conditions
to suppress overshoots. Modulation
controls signals are subtracted from the control path
to reduce the
control signal and the resultant attenuation under conditions where
extra attenuation is not necessary. The final signal
is then fed to a
nonlinear control law stage which provides the required
attenuation versus control voltage characteristics.
Low Level Stage
The low level stage is active for signal levels from -50 to -25 dB.
No low frequency signal processing is provided, but in all other
respects it
is quite similar to the high level stage.
Modulation Control
Modulation control is used to prevent unnecessary modulation of
the compressors
in the presence of high level signals. It is inactive
at low levels. The encoder output is fed
to the input of the
modulation control circuit, where it is split into three frequency
bands. The
MC1 signal goes through a 3 kHz high pass filter to a
full wave rectifier, and
is then fed in opposition to the HF/SB
control signals. MC2 is created by smoothing the
MC1 signal
using a 2 msec time constant. This signal is then applied
in
opposition to the HF/SB overshoot suppression signal. MC3 is low
pass filtered at 200 and 400 Hz, full wave rectified, and then fed in
opposition to the HF/SB control signals. The LF/FB is controlled by
MC4, which first passes through 200 and 400 Hz high pass filters
and a full wave rectifier.
www.audiodna.sk

8
Signal
Input
Low Freq.
Spectral
Skewing
High Level Stage
High Freq.
Sliding
Band
High Freq.
Fixed
Band
Low Freq.
Fixed
Band
Low Level Stage
High Freq.
Sliding
Band
High Freq.
Fixed
Band
MC1-3
MC4
Modulation
Control
High Level
Anti-
saturation
Low Level
Anti-
saturation
1----+----IM •
._ ____ _, 1st Stage Adder
6kHt
5 kHz
\__
12 kHt
\__
15 kHt
S-TVPE ENCODER BLOCK DIAGRAM
2nd Stage Adder Signal
Output
Out
'
I
i 0---MC2 --7 ~
i .-------------~-) + ----------, '--;-~
I I I I
: TPrlmory 0/S : :
---1---~--------~-L-~-~-.f+\c--L--~--f"rl
: L'.'.1__J i ~L'.....Jc-h--1· ~ L-J
! Secondary 0/S : ~t:;: :::~ ! ~C:; ~g ~~:
1 , MC1
-----1-------: t---------------~----------------Mc;---~
: : : ,_y· : :
3.2 kHz X:
~
l 1J- ~--------~------------------ --------------------·i----1---------------,
Fixed Band '
t~:::gg~: T O/S~--~ r-----0-1--J I ◄ r---t
______ -qV1n _ + .l.-r- =i= _ =l= __ Maximum
~
: er} Main Rectifier '
e kT I 160 msec Omsoc Selector
Signal Path----
Control Path---------
O/S = Overshoot Suppression
H, t
LB
S.TYPE HF STAGE BLOCK DIAGRAM
l ~~ i
L----~--LC_r---J
Passband Rectifier
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www.audiodna.sk

In
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From
Out
~--~~l
---------------------------,0-1 ~
,-------- 'T i :
f ::;;::~" , ____ ,,I J1 I ◄ I•- - -- --1
: I~ I
: ---- , Main Rectifier :
: r:;:-i, "'""- :
: ILl L.J,,,_r-- ~,.~, ~
--QB-,~~TLJ..r- ,.i;_ [_ _____________ ! I ◄ ~----L':::J
v!. IPu:lng I
Signal Path
Control Path---------
LFSTAGE BLOCK DIAGRAM S-TYP!:
Passband Rectifier
2 m•
.L
T
MC1
To HF
MC2 Stages
MC3
2nd
stage
adder
S-TYPE MODULATION CONTROL CIRCUITS BLOCK DIAGRAM
ToLF
MC4 Stage
9
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10
TIMING CHART
REC
STOP
ASB
RM1
AS i ;-
1
--.
1
-e-------;
!iaoiso!
RM2
,-, --
"
~
RPC6 H-------,''-'·':::tc-· ::._, --------,----+---4' <.::;:,:='---'----+--+-_,::;
·r++-
SOL
CPM
A-SW
B·SW
c-sw
D-SW
INH
BIAS
LINE
MUTE
PB H------4--+------'---+--+--'--.
:~;E H------4--+------'---+--+------lesol
MITTE 1 1
cHK o'c cHK
PLAY
!4+-
H-t-
4+-
:,so.-'----+--+---+-
CHK
STOP
+
RM1
10! iK
L---------~R!~----------~ ~1::i;;;•WJ=-: ----
~--------- !REW) ------- ! ; ;~
RM2
RPC6
~ ~ (REW) :
RPC3.7 ! i !
SOL
CPM
A-SW
B-SW
C-SW
0-SW
INH
BIAS
LINE
MUTE
PB
MUTE
REC
MUTE
o'.c
cHK
c'HK
PLAY
REV SEARCH
RM1
RM2
RPC6
SOL
CPM
A-SW
B•SW
C-SW
D-SW
INH
BIAS
LINE
MUTE
PB
MUTE
REC
MUTE
c'HK
c°HK
O.C
ciHK
CHK
C
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STOP
:
:
CttK
O.c
CHK
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(
!
\_
ALIGNMENT PROCEDURES (REFER TO PAGES 14, 15, 16, 17, 35, 36, 37, 38 AND 39)
■ CASSETTE MECHANISM CONFIRMATION
Make sure to confirm conditons of the cassette mechanism as
follows before adjustment.
1. Confirmation of erase prevention function
• The switch should turn ON when a tape with erroneous erase
preventive pawl is inserted. (Use a tape which is 0.2mm
smaller than the minimum size of 62.9mm or a MAZ-0184-C
gauge one.)
• When the switch arm is moved back gradually from the ON
position, the switch should turn
OFF.
2. Confirmation of cassette pack detection function
• The switch should turn ON when a tape is inserted. (Use a
tape whose minimum size is 63.5mm or a MAZ-0184-C gauge
one.)
• When the switch arm is moved back gradually from the ON
position, the switch should turn OFF.
3. Confirmation of eject function
• The cassette compartment opens smoothly and no abnormal
noise should be heard while opening and closing.
• The eject lock arm opens smoothly without contacting the
chassiS and damper.
• The eject button can not be pressed during playback.
4. Confirmation of playback, fast forward and rewind
functions
• The torque used in each of the playback, fast forward and
rewind modes should be within specification.
Playback .......................... 35gr.cm~70gr.cm
FastForward .................... 70gr.cm~160gr.cm
Rewind ............................. 70gr.cm~160gr.cm
• No abnormal noise should be heard during operation
in any
mode. The solenoid switching sound should not be considered
as a noise.
5. Confirmation of positions of record/playback head and
erase head
• Head height
a) Setthe M-300 head gauge.
b) Set the unit in the playback mode and place the adjustment
chip on the head gauge as shown
in the Fig. 1.
c) The adjustment chip should not contact the tape guide of
both record/playback head and erase head.
M·300 TAPE
GUIDE
ERASE
HEAD HEAD AZIMUTH ADJUSTMENT SCREW
Fig. 1
• Head position
a) Setthe M-300 head gauge.
b) Set the unit in the playback mode and place the adjustment
chip on the head gauge as shown in the Fig. 2.
c) With both record/playback head and erase head, the
adjustment chip should be between MIN and MAX of the M-
300 head gauge.
M·300
■ ELECTRICAL ADJUSTMENT AND CONFIRMATION
1. Before adjustment
Fig. 2
• Before electrical adjustment, make sure that confirmations of
the cassette mechanism are all completed.
After the power switch is pushed on, wait for 1
Ominutes before
measuring to be sure of the moststable operation.
• Since head magnetization, dust accumulations, etc. are likely
to introduce errors
in the various characteristics, it is very
important that the heads are properly demagnetized and
cleaned before commencing any adjustment, particularly
frequency response and head azimuth adjustment.
2. Instruments required
Low frequency oscillator
•
AC VTVM or dual channel AC VTVM
• Oscilloscope
• Wow/flutter meter
Frequency counter
• Distortion meter
3. Test tapes
• Azimuth adjustment ................................. MTT-114 or TCC-153
• Tape speed adjustment ......................
MTT-111 DN or TCC-112
Playback output level adjustment ........... TCC-130 or MTT-150
• Playback frequency characteristic confirmation
.................................. TCC-1216 orTCC-162C and TCC-262C
Music search adjustment .......................................... SCC-1425
Reference tapes
LN ...............................................................................SCC-502
CrO2 .......................................................................... SCC-1360
METAL ........................................................................ SCC-565
Note:
C-90 differes with C-60 in the thickness and bias is of unequal, so
adjust with the tape whose bias
in of specified value.
4. General conditions (unless otherwise noted)
Dolby NR Off
Input Level Maximum
MPX Filter Off
Bias Fine Trim Center
Rec Cal Center
Output Level Maximum
Azimuth Adjustment
When the maximum level point of R channel does not equal that L
channel, connect the oscilloscope as shown
in Fig. 3 and proceed
with azimuth adjustment so that L and R channels are
in phase.
a) Connect L channel tape out to "X (or V)" and R channel to "Y
(or H)". Observe the lissajouss waveform.
b) Set Land R channels to monaural. Adjust vertical and
horizontal gain so that the waveform becomes 45 degree.
c) Adjust azimuth so that the measurement
of "a" becomes
maximum and the measurement of "b" becomes minimum
against the 45 degree line.
oo
•
oo
•oo
GND
Fig. 3
PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: TCC-162C. TCC-262C
+3dB
OdB
-3dB
20Hz
250Hz
(±1.SdB)
315Hz
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: SCC-502. SCC-1360. SCC-565
DOLBY NR: OFF
+3dB
OdB
-3dB
+3dB
OdB
-3dB
10kHz 15kHz 1BkHz
(±1.5dB) (±2.5dB)
Fig.a
OdB
-3dB
10kHz 15kHz
20kHz
(±1.5dB) (t2.5dB)
Fig.b
Dolby S Type NR DC Adjustment
1. Apply -30dB below 43.5mV signal to INPUT jack with 100mS
On and 1S Off continuously.
2.
Connect the oscilloscope to TP1 and GND. Solder an
appropriate resistor (1 MO ~ 6.6M o) between TM17 and
TM18, so that the fluctuation
of DC level becomes below 3mV.
3. Connect the oscilloscope to TP2 and GND. Solder an
appropriate resistor between TM5 and TM6 with the same
procedure as above.
4. Apply -40dB below 43.5mV signal to INPUT jack with 100mS
On and 1S Off continuously.
5. Connect the oscilloscope to TP3 and GND. Solder an
appropriate resistor (1 MO ~ 6.6M o) between TM25 and
TM26, so that the fluctuation
of DC level becomes below 3mV.
6.
Connect the oscilloscope to TP4 and GND. Solder an
appropriate resistor between
TM11 and TM13 with the same
procedure as above.
Oscilloscope
GND
Note:
In case the Dolby NR (REC) P. C. Board can not be adjusted as
above, it needs additional resistors between these terminals.
TM15 and TM17
TM3 and TM5
TM24 and TM25
TM11 and TM12
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TESTTAPE: SCC·502, SCC-1360, SCC-565
DOLBY NR: TYPE BON
20Hz 100Hz 315Hz
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: SCC-502. SCC-1360. SCC-565
DOLBY NA: TYPE CON
+3dB
Od8
-
20Hz 100Hz 315Hz
+3dB
OdB
-3dB
4kHz
1BkHz 20kHz
Fig.c
4kHz 1BkHz
Fig.d
11
www.audiodna.sk

ALIGNMENT PROCEDURES (REFER TO PAGES 14, 15, 16, 17, 35, 36, 37, 38 AND 39)
■ CASSETTE MECHANISM CONFIRMATION
Make sure to confirm conditons of the cassette mechanism as
follows before adjustment.
1. Confirmation of erase prevention function
• The switch should turn ON when a tape with erroneous erase
preventive pawl is inserted. (Use a tape which is 0.2mm
smaller than the minimum size of 62.9mm or a MAZ-0184-C
gauge one.)
• When the switch arm is moved back gradually from the ON
position, the switch should turn OFF.
2. Confirmation of cassette pack detection function
• The switch should turn ON when a tape is inserted. (Use a
tape whose minimum size is 63.5mm or a MAZ-0184-C gauge
one.)
• When the switch arm is moved back gradually from the ON
position, the switch should turn OFF.
3. Confirmation of eJect function
• The cassette compartment opens smoothly and no abnormal
noise should be heard while opening and closing.
• The eject lock arm opens smoothly without contacting the
chassis and damper.
• The eject button can not be pressed during playback.
4. Confirmation of playback, fast forward and rewind
functions
• The torque used in each of the playback, fast forward and
rewind modes should be within specification.
Playback .......................... 35gr.cm~70gr.cm
FastForward .................... 70gr.cm~160gr.cm
Rewind ............................. 70gr.cm~160gr.cm
No abnormal noise should be heard during operation
in any
mode. The solenoid switching sound should not
be considered
as a noise.
5. Confirmation of positions of record/playback head and
erase head
• Head height
a) Set the M-300 head gauge.
b) Set the unit in the playback mode and place the adjustment
chip
on the head gauge as shown in the Fig. 1.
c) The adjustment chip should not contact the tape guide of
both record/playback head and erase head.
M-300 TAPE
GUIDE
CHIP
HEAD AZIMUTH ADJUSTMENT SCREW
Fig. 1
• Head position
a) Set the M-300 head gauge.
b) Set the unit in the playback mode and place the adjustment
chip on the head gauge as shown
in the Fig. 2.
c) With both record/playback head and erase head, the
adjustment chip should be between MIN and MAX of the M-
300 head gauge.
M-300
Fig. 2
■ ELECTRICAL ADJUSTMENT AND CONFIRMATION
1. Before adJustment
Before electrical adjustment, make sure that confirmations of
the cassette mechanism are all completed.
• After the power switch is pushed on, wait for 10 minutes before
measuring to be sure of the moststable operation.
Since head magnetization, dust accumulations, etc. are likely
to introduce errors in the various characteristics, it is very
important that the heads are properly demagnetized and
cleaned before commencing any adjustment, particularly
frequency response and head azimuth adjustment.
2. Instruments required
• Low frequency oscillator
AC VTVM or dual channel AC VTVM
• Oscilloscope
• Wow/flutter meter
• Frequency counter
• Distortion meter
3. Test tapes
• Azimuth adjustment ................................. MTT-114 or TCC-153
• Tape speed adjustment ...................... MTT-111DN or TCC-112
• Playback output level adjustment ........... TCC-130 or MTT-150
• Playback frequency characteristic confirmation
.................................. TCC-1216 or TCC-162C and TCC-262C
Music search adjustment .......................................... SCC-1425
Reference tapes
LN ............................................................................... SCC-502
CrO2 .......................................................................... SCC-1360
METAL ........................................................................ SCC-565
Note:
C-90 differes with C-60 in the thickness and bias is of unequal, so
adjust with the tape whose bias
in of specified value.
www.audiodna.sk

4. General conditions (unless otherwise noted)
Dolby NR
Input Level Maximum
MPX Filter Off
Bias Fine Trim Center
Rec Cal Center
Output Level Maximum
Azimuth Adjustment
When the maximum level point of R channel does not equal that L
channel, connect the oscilloscope as shown
in Fig. 3 and proceed
with azimuth adjustment so that L and R channels are
in phase.
a) Connect L channel tape out to "X (or V)" and R channel to "Y
(or H)". Observe the lissajouss waveform.
b) Set L
and R channels to monaural. Adjust vertical and
horizontal gain so that the waveform becomes 45 degree.
c) Adjust azimuth so that the measurement of "a" becomes
maximum and the measurement of "b" becomes minimum
against the 45 degree line.
GND
Fig. 3
PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: TCC-162C. TCC-262C
+3dB
OdB
-3dB
20Hz
250Hz
{t1.5dB)
315Hz
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: SCC-502. SCC-1300. SCC-565
DOLBY NR: OFF
+3dB
OdB
-3dB
20Hz 250Hz
{t1.5dB)
315Hz
10kHz 15kHz 18kHz
(t1.5dB) (t2.5dB)
Fig.a
+3dB
Od8
-3dB
10kHz 15kHz
20kHz
{t1.5dB)
{±2.SdB)
Fig. b
Dolby S Type NR DC Adjustment
1. Apply -30dB below 43.5mV signal to INPUT jack with 100mS
On and 1S Off continuously.
2. Connect the oscilloscope to TP1 and GND. Solder an
appropriate resistor
(1 MQ ~ 6.6M Q) between TM17 and
TM 18, so that the fluctuation of DC level becomes below 3mV.
3. Connect the oscilloscope to TP2 and GND. Solder an
appropriate resistor between TM5 and TM6 with the same
procedure as above.
4. Apply -40dB below 43.5mV signal to INPUT jack with 100mS
On and 1S Off continuously.
5. Connect the oscilloscope to TP3 and GND. Solder an
appropriate resistor
(1 MQ ~ 6.6M Q) between TM25 and
TM26,
so that the fluctuation of DC level becomes below 3mV.
6. Connect the oscilloscope to TP4 and GND. Solder an
appropriate resistor between
TM11 and TM13 with the same
procedure as above.
Oscilloscope
GND
Note:
In case the Dolby NR (REC) P. C. Board can not be adjusted as
above, it needs additional resistors between these terminals.
TM15 and TM17
TM3
and TM5
TM24 and TM25
TM11 and TM12
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: SCC-502. SCC-1360, SCC-565
DOLBY NR: TYPE BON
20Hz
100Hz 315Hz
RECORD/PLAYBACK FREQUENCY CHARACTERISTIC
TEST TAPE: SCC-502, SCC-1360, SCC-565
DOLBY NA: TYPE C ON
+3dB
Od8
-3dB
20Hz
100Hz 315Hz
+3dB
OdB
-3dB
4kHz
18kHz 20kHz
Fig.c
4kHz
18kHz
Fig.d
11
www.audiodna.sk

TP501 (Leh), GND Maximum output
Oscilloscope PB TP502 (Reh), GND Azimuth screw Refer to "Azimuth Adjustment" on page
11.
Test tape (MTT-114 or TCC-153) or OUTPUT jack
Tape speed Frequency counter PB TP501 (Leh), GND VR (built
in motor) 3000Hz ± 10Hz
Test tape
(MTT-111 DN or TCC-112) TP502 (Reh), GND Adjust at the center of test tape. (
VTVM TP501 (Leh), GND VR101 (Leh) 388mV
Playback output level· Test tape (TCC-130 or MTT-150) PB TP502 (Reh), GND VR102 (Reh) Tape selector is
LN position.
Playback output level VTVM PB TP501 (Leh), GND VR103 (Leh) 388mV
Test tape (TCC-130 or M,:T-150) TP502 /Reh), GND VR104 (Reh) This adjustment should be at Dolby S type NR ON position.
Playback frequency VTVM TP501 (Leh), GND
characteristic confirmation Test tape (TCC-1216 or TCC-162C PB TP502 (Reh), GND So that the frequency response is within the range as shown
in Fig. a.
and TCC-262C) or OUTPUT jack
Oscilloscope Forward TP751, GND VR751 Perform checkong with Forward Search mode at the front of the test tape.
Test tape (SCC-1425) Search Adjust
VR751 so that the DC level becomes 1.6 ±0.05V.
Frequency counter REC TP101 (Leh), GND T301
21 0kHz ± 3kHz
TP102 (Reh), GND T302 Tape selector is METAL position.
) TP101 (Leh), GND
L301 Tape selector is METAL position.
[,
Dolby HX PRO VTVM REC TP102 (Reh), GND L302 So that the bias level is maximum.
TP201 (Leh), GND LC201, LC203 Minimum output
VTVM REC TP202 (Reh), GND LC202,LC204 Tape selector is METAL position.
Input Level control is minimum.
VR301 3.3mV (
VR302 Tape selector is METAL position.
Bias level (pre-adjustment) VTVM REC TP101 (Leh), GND VR305 1.8mV
TP102 (Reh), GND VR306 Tape selector is
CrO2 position.
VR303 1.2mV
VR304 Tape selector is
LN position.
VR203, VR204 388mV
VTVM Tape selector is METAL position.
Blank tapes VR301, VR302 Adjust VR301 and VR302 so that the distortioon becomes 0.8%~1.2%
CrO2 SCC-1360 Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that REC/PB TP501 (Leh), GND 388mV
METAL SCC-565 TP501 and TP502 to GND voltage is 388mV
in REC-PAUSE mode. TP502 (Reh), GND VR303, VR304 Adjust VR303 and VR304 so that the distortion becomes 1.3% (CrO2). (
LN
SCC-502
(CrO2)
Adjust VR305 and VR306 so that the distortion becomes 0.7% (LN).
--
VR305, VR306 (LN) This confirmation should be at each tape selector position.
VR301, VR302 So that the record/playback frequency response is flat (at least within the
L201, L202 range
in Fig. b).
VTVM Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that Tape selector is METAL position.
Record/playback equalizer Blank tapes TP501 and TP502 to GND voltage is 25dB below 388mV in REC- REC/PB OUTPUTjack So that the record/playback frequency response is flat (at least within the
CrO2 SCC-1360 PAUSE mode. VR303, VR304 range
in Fig. b).
frequency characteristic METAL SCC-565 Then adjust with a 20Hz to 30kHz sweep signal. Tape selector is
CrO2 position.
LN SCC-502 So that the record/playback frequency response is flat (at least within the
VR305, VR306 range
in Fig. b).
Tape selector is
LN position.
VTVM
Blank tapes Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that 388mV
CrO2 SCC-1360 REC/PB TP501 (Leh), GND VR203 Perform adjustment using
CrO2.
METAL SCC-565 TP501 and TP502 to GND voltage is 388mV
in REC-PAUSE mode. TP502 (Reh), GND VR204 Perform checking only for
LN and METAL tapes.
LN SCC-502
VTVM Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
Record/playback equalizer Blank tapes Perform checking with Dolby
B, C and S NR ON at each tape selector
frequency characteristic
CrO2 SCC-1360 TP501 and TP502 to GND voltage is 25dB below 388mV in REC- REC/PB OUTPUT jack position.
PAUSE mode.
confirmation METAL SCC-565 Then adjust with a 20Hz to 30kHz sweep signal. Confirm the record/playback frequency characteristic is within ± 3 dB at 20
LN
SCC-502 to 20 kHz.
VTVM Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that REC- PEAK LEVEL METER
VR401
Adjust VR401 and VR402 so that the peak level meter reads: -1 dB.
TP501 and TP502 to GND voltage is 1.5dB below 388mV. PAUSE VR402
Apply 19kHz, 15kHz and 1kHz signal to INPUT jack. Set INPUT LEVEL REC- TP501 (Leh), GND MPX filter
is ON position.
VTVM knob so thatTP501 and TP502 to GND voltage is 388mV. PAUSE TP502 (Reh), GND Confirm the attenuation level at 15kHz and 19kHz within specification.
or OUTPUTjack
VTVM Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that REC- TP501 VR602 When press and hold the REC CAL, adjust VR602 so that the output level
TP501 and TP502 to GND voltage is 388mV
in REC-PAUSE mode. PAUSE TP502 of TP501 and TP502 is 388mV.
Apply 400Hz signal to INPUT jack. Set INPUT LEVEL knob so that TP501 VR603 When press and hold the BIAS, adjust VR603
so that the output level of
TP501 to GND voltage is 388mV
-20dB in REC-PAUSE mode. REC- TP501 is 90mV.
VTVM PAUSE
Apply 12.5kHz signal to INPUT jack. Set INPUT LEVEL knob so that TP502
VR601
When press and hold the BIAS, adjust VR601 so that the output level of
TP502 to GND voltage is 388mV
-20dB in REC-PAUSE mode. TP502 is 90mV.
12
www.audiodna.sk

12
Oscilloscope
Test tape (MTT-114 or TCC-153)
Tape speed Frequency counter
Test tape (MTT-111DN or TCC-112)
Playback output level· VTVM
Test tape (TCC-130 or MTT-150)
Playback output level VTVM
Test tape (TCC-130 or M,:T-150)
Playback frequency VTVM
Test tape (TCC-1216 or TCC-162C
characteristic confirmation and TCC-262C)
Oscilloscope
Test tape (SCC-1425)
Frequency counter
Dolby
HX PRO VTVM
VTVM
Bias level (pre-adjustment) VTVM
Record/playback equalizer
frequency characteristic
Record/playback equalizer
frequency characteristic
confirmation
VTVM
Blank tapes
CrO2 SCC-1360
METAL SCC-565
LN SCC-502
VTVM
Blank tapes
CrO2 SCC-1360
METAL SCC-565
LN SCC-502
VTVM
Blank tapes
CrO2 SCC-1360
METAL SCC-565
LN SCC-502
VTVM
Blank tapes
VTVM
VTVM
VTVM
VTVM
CrO2 SCC-1360
METAL SCC-565
LN SCC-502
F
F
F
F
F
F
s
F
F
F
F
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that F
TP501 and TP502 to GND voltage is 388mV in REC-PAUSE mode.
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 and TP502 to GND voltage is 25dB below 388mV in REC-
PAUSE mode.
Then adjust with a 20Hz to 30kHz sweep signal.
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 and TP502 to GND voltage is 388mV in REC-PAUSE mode.
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 and TP502 to GND voltage is 25dB below 388mV in REC-
PAUSE mode.
Then adjust with a 20Hz
to 30kHz sweep signal.
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 and TP502 to GND voltage is 1.5dB below 388mV.
Apply 19kHz, 15kHz and 1kHz signal
to INPUT jack. Set INPUT LEVEL
knob so that
TP501 and TP502 to GND voltage is 388mV.
Apply 1kHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 and TP502 to GND voltage is 388mV in REC-PAUSE mode.
Apply 400Hz signal to INPUT jack. Set INPUT LEVEL knob so that
TP501 to GND voltage is 388mV -20dB in REC-PAUSE mode.
Apply 12.SkHz signal to INPUT jack. Set INPUT LEVEL knob so that
TP502 to GND voltage is 388mV
-20dB in REC-PAUSE mode.
www.audiodna.sk

TP501 (Leh), GND Maximum output
PB TP502 (Reh), GND Azimuth screw Refer to "Azimuth Adjustment" on page
11.
or OUTPUT jack
PB TP501 (Leh), GND VR (built
in motor) 3000Hz ± 10Hz
TP502 (Reh), GND Adjust at the center of test tape. (
TP501 (Leh), GND VR101 (Leh) 388mV
PB TP502 (Reh), GND VR102 (Reh) Tape selector is
LN position.
PB TP501 (Leh), GND VR103 (Leh) 388mV
TP502 /Reh), GND VR104 (Reh) This adjustment should be at Dolby S type NR
ON position.
TP501 (Leh), GND
PB TP502 (Reh), GND So that the frequency response is within the range as shown
in Fig. a.
or OUTPUT jack
Forward TP751, GND VR751 Perform checkong with Forward Search mode at the front of the test tape.
Search Adjust VR751 so that the
DC level becomes 1.6 ±0.05V.
REC TP101 (Leh), GND T301
21 0kHz ± 3kHz
TP102 (Reh), GND T302 Tape selector is METAL position.
REC TP101 (Leh), GND
L301
Tape selector is METAL position.
TP102 (Reh), GND L302 So that the bias level is maximum.
TP201 (Leh), GND LC201, LC203 Minimum output
REC Tape selector is METAL position.
TP202 (Reh), GND LC202,LC204 Input Level control is minimum.
VR301 3.3mV C
VR302 Tape selector is METAL position.
REC TP101 (Leh), GND VR305 1.8mV
TP102 (Reh), GND VR306 Tape selector is
CrO2 position.
VR303 1.2mV
VR304 Tape selector is
LN position.
VR203, VR204 388mV
Tape selector is METAL position.
VR301, VR302 Adjust VR301 and VR302 so that the distortioon becomes 0.8%~1.2%
so that REC/PB TP501 (Leh), GND
Ide. TP502 (Reh), GND 388mV
VR303, VR304 Adjust VR303 and VR304 so that the distortion becomes 1.3% (CrO2).
(CrO2) Adjust VR305 and VR306 so that the distortion becomes 0.7% (LN).
VR305, VR306 (LN) This confirmation should
be at each tape selector position.
VR301, VR302 So that the record/playback frequency response is flat (at least within the
L201,L202
range in Fig. b).
so that Tape selector is METAL position.
n REC- REC/PB OUTPUT jack So that the record/playback frequency response is flat (at least within the
VR303, VR304 range
in Fig. b).
Tape selector is
CrO2 position.
So that the record/playback frequency response is flat (at least within the
VR305, VR306 range
in Fig. b).
Tape selector is
LN position.
388mV
so that REC/PB TP501 (Leh), GND VR203 Perform adjustment using
CrO2.
>de.
TP502 (Reh), GND VR204 Perform checking only for
LN and METAL tapes.
so that Perform checking with Dolby
B, C and S NR ON at each tape selector
n REC- REC/PB OUTPUTjack position.
Confirm the record/playback frequency characteristic is within ± 3 dB at 20
to 20 kHz.
so that REC- PEAK LEVEL METER VR401 Adjust VR401 and VR402
so that the peak level meter reads: -1 dB.
PAUSE VR402
"LEVEL REC- TP501 (Leh), GND MPX filter is ON position.
PAUSE TP502 (Reh), GND Confirm the attenuation level at 15kHz and 19kHz within specification.
or OUTPUT jack
so that REC- TP501 VR602 When press and hold the REC CAL, adjust VR602 so that the output level
ide. PAUSE TP502 of TP501 and TP502 is 388mV.
so that When press and hold the BIAS, adjust VR603 so that the output level of
REC- TP501 VR603 TP501 is 90mV.
PAUSE
, so that TP502 VR601 When press and hold the BIAS, adjust VR601 so that the output level of
TP502 is 90mV.
www.audiodna.sk

A B
WIRING DIAGRAM
1
2
3
C
4
LCN802
International model
5
6
WIRE COLOR ABBREVIATIONS
RED : Red YEL : Yellow
ORG :Orange
PUP : Purple
BLU : Blue PIK : Pink
WHT : Whne GRY : Gray
GRN :Green BRN : Brown
7
BLK : Black
C D
ERASE HEAD
~y
T
JL101
JL102
JL103
LCN804
CASSETTE MECHANISM
E
RECORD/PLAYBACK HEAD
BLK
From CN803
t
LCN501
F
LCN502
G
IPCB-4IHEADPHONES JACK
P. C. BOARD
H
13
www.audiodna.sk

1
2
3
4
5
6
7
A B
WIRING DIAGRAM
LCN802
International model
WIRE COLOR ABBREVIATIONS
RED : Red YEL : Yellow
ORG :Orange PUP : Purple
BLU : Blue PIK : Pink
WHT : Whtte GRY : Gray
GRN :Green BRN : Brown
BLK : Black
C
JL101
JL102
JL103
LCN804
CASSETTE MECHANISM
0
00
z
g
D
ERASE HEAD
~ r.oy
~
E
RECORD/PLAYBACK HEAD
From CN803
t
www.audiodna.sk

F
LCN502
,CK HEAD
C.BOARD
LCN501
G
I
PCB-4 I HEADPHONES JACK
P. C. BOARD
H
13
www.audiodna.sk

1
2
3
4
5
6
7
14
B
P. C. BOARDS (1)
IPCB-1 I Main P. C. Board
z
-0
C
-I
r
m
<
m
r
C D E F G H
BIAS LEVEL
{IMETAL)ADJ.
J
RECORD/PLAYBACK
EQUALIZER FREQUENCY
CHARACTERISTIC ADJ.
(
www.audiodna.sk