Sharp GF-777H User manual

SHARP
SERVICE
MANUAL
ATSM881115RCS
GF-777H
GF-777E
In the interests of user-safety the set should be
restored to its original condition and only parts
identical to those specified be used.
PHOTO: GF-777H
FEATURES
Multi-Amp 3-Way 6-Speaker System Massive 90W PMPO
Dynamic Super Woofer Sound
16cm (6%"") Woofer with Rigid Speaker Ring
Horn Tweeter for Clear, Crisp Highs
Two Decks Side by Side, for Versatile Record/Playback
Soft-Touch Cassette Controls
Brilliant Metal Tape Sound
APLD (Auto Program Locate Device)
Sharp Super Noise Reduction System
INDEX TO CONTENTS
SPECIFIGATIONS, qos st oe cypress EB epee coals «ARR 6 gstet R amepegs Cee eee see eee 2
POWER SUPPLY/AG-SUPPLY. VOLTAGE.SELECTOR, wo:.:0.00 ctecesegure cence w canes 2
NAMES OF PARTS a isdseercveSpeiocoyeptasicss) oy tyecaj can Rhee dceelshces Se Spneysbaqnpe wien decd Spader 3,4
DISASSEMBLY ........ 1G Dien Ot Bmaeta Kae Cm oeghs se We Te Dee elame ee 4~7
BLOCK. DIAGRAM. a c.cccseccsberamesremeannn cewenceuot ee weuaseoaguines 8,9
MECHANICAL. ADJUSTMENT sacncacce cia caae cee cane e cn deen ene nee ns 10
ELECTRICAL ADJUSTMENT oc cccacccsedandaden ines wee eneeeedaae a 11 ~16
NOTES ON SCHEMATIC: DIAGRAM, 2. ooo: 20s ciuiaeeanae cameee maamerdmanc aware 17
SERVICING OF LEG-LESS TYPE RESISTORS AND CAPACITORS ......... 17,18
SCHEMATIC DIAGRAM) «.c5sc0ica.eeswevis vieeee ee Getions ees 19, 20, 23, 24
WIRING SIDE OF PRINTED WIRING BOARD .................. 21,22,25 ~29
CABINET EXPLODED VIEW ca. .000 0 0tihate teener. Sasserln. me Laaosio cael 30 ~ 32
MECHANISM EXPLODED: TOP VIEW ... ..e¢cin oc. teu aide wagation «.aeum Dee ds 33
MECHANISM EXPLODED BUTTOM VIEW *. aiiceccs deaiwen Oo setae se aarties 34
DIAL CORDS TRINGING ic ajsccise tes a: 0 se a: PROMS cin, SEES AOR, IE ses Ole CNS 35
AG SUPPLY: CORID) aco: cctnsy-r steps: appeal oa wo OOS: AAS PENNS wei". te oaibecs lta 35
EQUIVALENT CIRCUIT OF INTEGRATED CIRCUIT .................... 36, 37
PACKING METHOD (GE-777E Only) ose: ccniseewennees snceeeeobe wd ee: oak 38
REPLACEMENT PARTS: LIST weiss nace sescyey eect sa sea oaunate emi erage os win 39 ~ Back
SHARP
CORPORATION
Osaka,
JAPAN
GF-777H

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,
PLEASE REFER TO THE OPERATION MANUAL
SPECIFICATIONS
GENERAL
TAPE
RECORDER/PLAYER
Power
source:
AC
110/220/240V
,
50/60Hz
Tape:
Philips-type
compact
cassette
tape
DC 15V (UM/SUM-1, R-20, HP-2, Frequency response: 30Hz to 18000Hz (Metal tape)
or “D’’ battery x 10, or external 30Hz to 17000Hz (CrO, tape)
DC supply) 30Hz to 14000Hz (normal tape)
Speakers:
Super
Woofer;
16cm
(6-1/2")
x2
S/N
ratio:
56dB
(SNRS:
ON,
METAL
TAPE)
Woofer; 16cm (6-1/2") x 2 Wow and flutter (DIN 45511):
Tweeter; Horn type x 2 0.14%
Output
power:
(GF-777H)
(DIN
45324)
Input
sensitivity
and
input
impedance:
MPO 28W, AC supply operation, Ext. Mic; 600 ohms
with four amplifiers Mixing mic; 600 ohms
RMS 24W, DC supply operation, Line in; 0.1V/100k ohms
with four amplifiers Output level and loaded impedance:
(GF-777E)
MPO
45W,
AC
supply
operation,
Headphones;
8
ohms
to
25
ohms
with
four
amplifiers
External
speaker;
4
ohms
to
8
ohms
RMS
24W,
DC
supply
operation,
Line
out;
0.6V/47k
ohms
with four amplifiers
Semiconductors:
17-IC’s
RADIO
52-Transistors Frequency range: LW; 150 —285kHz
1-FET
MW;
520
—
1620kHz
1-SCR
SW;
5,95
—
18MHz
61-Diodes
FM;
87,6
—
108MHz
11-LED’s
Dimensions: Width; 752mm
Depth; 166mm
Height; 379mm
Weight (without batteries): 12.2kg
POWER SUPPLY
The GF-777H/E Unit will operate on an AC mains supply of
110 Volts, 220 Volts, or 240 Volts of 50Hz or 6OHz. For
portable use it will operate on its internal batteries, or from an
external 15 Volts DC supply (with an adaptor).
AC
SUPPLY
VOLTAGE
ADJUSTMENT
The Voltage Selector setting should be checked to see that it
conforms to the local AC supply voltage. This must be done
before plugging in to the AC supply. Adjustment is made by
turning the adjusting screw in either direction with a minus
headed screwdriver until reading of Selector matches the local
AC supply voltage.
Caution:
Use this unit only on the specified voltages, otherwise
damage, fire, or accidents may be caused. SHARP cannot
accept responsibility for any damage resulting from the use
of this unit on unspecified voltages.

aOBWN =
16.
17.
18.
19.
20.
32.
33.
34.
35.
36.
37.
38.
. Deck 1: Cassette Compartment
. Deck 2: Cassette Compartment
. Super Woofer Sound Control (Left)
. Super Woofer Sound Control (Right)
. Tweeter (Left)
Deck 1: Cassette Ejection Key
Deck 1: Playback Key
Deck 1: Stop Key
Deck 1: Rewind/Review Key
Deck 1: Cut Key
Deck 2: Tape Counter
Deck 2: Tape Counter Reset Button
—
SOMND
NAMES OF PARTS
. Woofer (Left)
. Super Woofer (Left)
. Deck 1: Monitoring Socket
Mixing Microphone Socket
Headphones Socket
11.
12.
13.
14.
15.
Super Woofer (Right)
Woofer (Right)
Tweeter (Right)
Built-in Microphone For Left Channel
Recording
Built-in Microphone For Right Channel
_Recording
Double
Cassette
2A:
22.
23.
24.
25;
Stereo Recording Level Control (Left)
Stereo Recording Level Control (Right)
Recording Mode Switch
Dubbing Switch
VU Meter/Battery Indicator
7 839 4 10
Figure 3-1
Were
c
uble
‘cassette
12
Deck 1: Fast Forward Wind/Cue Key 26. Deck 2: Playback Key
Deck 1: Pause Key
Deck 2: Editing Key
Deck 2: Pause Key
Deck 2: Record Key
19 20 21 22 23 24 25 26
Figure 3-2
27. Deck 2: Stop Key
28. Deck 2: Rewind/Review Key
29. Deck 2: Cut Key
30. Deck 2: Fast Forward Wind/Cue Key
31. Deck 2: Ejection Key
27° «28 29
39. VU/Meter/Tuning Indicator
40. Deck 1: Tape Selector Switch
41. Deck 2: Tape Selector Switch
42. SNRS Switch
43. Meter Selector/Dial Light Switch
44. FM Mode/FM Muting Switch
45. Wave Band Selector Switch
46. Radio Echo Indicator
47. Dubbing Indicator
48. FM Stereo Broadcast Indicator
49, Fine Tuning Control
50. Tuning Control
51. APLD Input Buttons
ave
on
36 37 40 41
42 44 45
Figure 3-3
=

52. APLD Indicators 56. Echo Control 60. Treble Tone Control
53. Function Switch 57. Microphone Fader Control 61. Channel Balance Control
54. Deck Mode Selector Switch 58. Tape Fading Control 62. Cutput Volume Control!
55. Mixing Switch 59. Bass Tone Control 63. Loudness Switch
Figure 4-1
64. Power Switch 70. Grounding Terminal 76. Battery Compartment
65. Power Indicator 71. Remote Start/Stop Control Socket 77. Beat Interference Cancelling Switch
66. FM Antenna Terminals 72. External Microphone Socket 78. External Super Woofer Sockets
67. Input Selector Switch 73. AC Supply Voltage Selector 79. External Main Speaker Sockets
68. Line Output Sockets 74. 15 Volt DC Terminal 80. Telescopic Antenna
69. Record Player Input and 75. AC Supply Input Terminal
Line Input Sockets
68 67 6970 72 71 80
73 «7574 76 79 7778
Figure 4-2
DISASSEMBLY
Caution:
Prior to the disassembly, be sure to draw the AC mains lead cassette compartment with a cassette tape.
plug from the AC mains socket of the unit and to unload the
= Removal of Front Cabinet and Back Cabinet
1.
Remove
one
tuning
control
knob,
one
fine
tuning
control
knob,
one
volume
control
knob,
two
record
control
knobs,
six
other
control
knobs,
one
deck
mode
selector
knob,
one
wave
band
selector
knob
and
other
ten
selector
knobs.
Then
remove
two
punching
metals
and
two
super
woofer
sound
control
knobs.
See
Fig.
4-3.
2.
Remove
nine
screws
at
the
front
cabinet
and
back
cabinet.
See
Fig.
5-1.
3.
Open
the
back
cabinet,
and
withdraw
two
antenna
lead
tips
a
I
(white,
black)
from
the
cabinet
inside.
See
Fig.
5-2.
ee
ee
i
4.
Remove
one
socket
from
the
power
P.W.B.
located
at
the
——
a
lower
of
the
back
cabinet.
See
Fig.
5-3.
Figure 4-3
=f

Figure 5-2
Removal of Main Frame
Remove
five
sockets
at
the
power
amplifier
P.W.B.
See
Fig.
5-4.
Remove
three
screws
at
the
main
frame,
two
screws
at
the
power
switch
holder,
one
screw
at
the
power
amplifier
P.W.B.,
three
screws
at
the
headphone/microphone
P.W.B.
and
one
socket
at
the
echo
P.W.B.
Then
hold
the
main
frame
up
to
remove.
See
Fig.
5-5.
Figure 5-1
Figure 5-5
alias
Figure 5-3

EZ Removal of Mechanism Block
1. Remove three sockets at the mechanism P.W.B., two
sockets at the record/playback P.W.B. and one socket at the
bias current P.W.B. See Fig. 6-1 and 6-2.
2. Detach the tape counter drive belt from the tape take-up
reel disk. Remove four screws at the mechanism block, and
shift the mechanism block forwards and detach. See
Fig. 6-3.
Figure 6-1
Figure 6-2 Figure 6-3
= Removal of Tuner Frame
1.
Remove
one
socket
at
the
tuner
P.W.B.
See
Fig.
6-4.
2.
Loosen
three
tabs
securing
the
dial
scale
plate,
and
detach
the
plate
while
shifting
it
down.
See
Fig.
6-5.
3.
Remove
three
screws
at
the
tuner
frame,
and
detach
the
frame
while
shifting
it
to
right.
See
Fig.
6-6.
me
Wo
RARBERBAE
ao.
Amar
weeeeeter
ef
-
.
Wa
«
a
Figure 6-5
= Removal of Power Amplifier P.W.B.
1. Remove one screw and two tabs at the super woofer sound
control P.W.B., and one screw at the power amplifier
P.W.B. Then hold up the power amplifier P.W.B. to remove.
See Fig. 6-7.
Figure 6-7

Figure 7-1
Figure
7-2
Figure
7-3
= Removal of Record/Playback P.W.B.
1. Remove two screws at the APLD P.W.B. and four tabs at
the indicator P.W.B. holder. See Fig. 7-1.
2.
Remove
three
tabs
at
the
bias
current
P.W.B.
See
Fig.
7-2.
3. Remove two screws at the input/output terminal board. See
Fig. 7-1.
4. Remove one nut and one screw at the record/playback
P.W.B. See Fig. 7-3.
5. Withdraw the record/playback P.W.B., and remove two
screws and two tabs at the angle supporting the volume
P.W.B. See Fig. 7-4.
6. Remove two tabs at the APLD switch P.W.B. Thus it is
Figure
7-4
possible
to
detach
the
record/playback
P.W.B.
and
volume
P.W.B. from the main frame. See Fig. 7-4.
= Removal of Power P.W.B.
1. Remove four screws at the power transformer and two
screws at the AC socket. Then detach the power P.W.B. See
Fig. 7-5.
Figure 7-5

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MECHANICAL ADJUSTMENT
Pinch Roller Pressure Check
1) Set the unit in play mode.
2) Push a tension gauge (0 to 500 g) into the pinch roller lever
to make the pinch roller off the capstan, and release the
gauge applied force gently so that the pinch roller sets back
to the capstan (the pinch roller again rotates).
At the time, the tension gauge reading must be 300 to
380 g.
3) If the step 2) is unsatisfied, bend the pinch roller pressure
spring properly, or renew it.
=
TORQUE
CHECK
AT
PLAY,
FAST
FORWARD
AND
REWIND
MODES
Put
a
torque
meter
cassette
in
the
cassette
compartment
of
the
set,
and
see
that
the
measured
torque
in
each
mode
is
normal
as follows:
Mode
Torque
meter
cassette
|
Measured
torque
Playback
TW-2111
35
~
60
gram-cm
Fast-forward
TW-2231
90
~
135
gram-cm
TW-2231
90
~
135
gram-cm
Tw-2231
TwW-2111
Figure
10-2
=
GAP
CHECK
OF
PINCH
ROLLER
LEVER
©
Place the set in play mode, and see that the pinch roller lever
moves to create the gaps (A), (B) and © as shown in Fig. 10-3.
Play Release Lever
Pinch Roller Lever
:
Figure
10-3
Tape
Speed
Adjustment
1) Reproduce a test tape (TEAC, MTT—111, 3 kHz-
prerecorded) — the playback must be at the middle of the
tape but not at either the beginning or the end.
2) Connect a wow/flutter meter, across a 100K ohm resistor,
to the line output socket.
3) Adjust the semi-variable resistor, using a plastic screwdriver
via the hole at the motor unit bottom, so that the playback
frequency will be 2,985 to 3,015 Hz (Deck 1) and 2,970 to
3,000 Hz (Deck 2).
Note:
The motor pulley, flywheel drive belt, flywheel, take-up
pulley, take-up idler and take-up turntable, etc. must be free
of any contamination.
Figure 10-4
~10—

ELECTRICAL ADJUSTMENT
Figure 11-1
Record Amplifier Bias Current/Bias Oscillator Frequency
Adjustment
1) Connect a VTVM to both ends of the resistor (R453 or
R454) on the record/playback amp. printed wiring board.
2) Set the function selector switch to ‘tape’, the deck-2 tape
selector switch to “‘Normal’’ and the best interference
canceller switch to “A” position.
3) Connect an oscilloscope (the vertical input) to the output
of VTVM, and an audio generator to the oscilloscope (the
horizontal input).
4) Place the unit in record mode, and check that the bias
oscillator frequency, on the oscilloscope Lissajou’s figure, is
76 to 84kHz. Next by setting the beat interference
canceller switch to “’B” and “‘C” positions, the range of that
frequency must be within —1.541.0 kHz and —6£1.5 kHz
in respective positions.
5) Adjust the bias current adjust semi-variable resistor (VR451
or VR452) so that the VTVM reads 4.4 mV.
Erase Current Check
1) Connect the VTVM between the test point TP451 and
TP452.
2) Set the function selector switch to ‘‘tape’’, the deck-2 tape
selector switch to “Metal” positions.
3) Place the unit in record mode, and check the at the VTVM
is reading 135 to 185 mV.
R45, R&S. Sa a cle eer eer . eee ————
eapese
c=
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ees SEEEEEES a EE 8
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ae e S
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EB
Figure 11-2
Figure 11-3
VR451 VR452
Bias Current
Oscilloscope
Audio generator
Record mode Oscilloscope
Figure 11-5
4g

Record/Playback Head Azimuth Adjustment
1) Connect a VTVM, across a 50K ohm resistor, to the line
output socket.
2) Set the function selector switch to “‘tape’’ position.
3) Put a test tape (TEAC, MTT-114, 10 kHz, 250 pWb/mm,
—10 dB prerecorded) into the unit, and play it.
4) Adjust the head azimuth adjusting screw so that sine
waveform attains the maximum and the same phase in right
and left.
as small as possible
TEST tape
MTT-114
ee
Figure 12-2
Battery Condition Meter Sensitivity Adjustment
1) Connect a regulated power supply (DC 15V) to the battery
terminal.
2) Set the function selector switch to “tape” position.
3) Place the unit in playback mode, and set the meter selector
Dial Light switch to “tune/batt/on”’ position.
4) Reduce this supply voltage, slowly, until the voltage, when
the pointer on the battery meter in the “0” position, must
remain at 10.0 to 10.8V and the Meter illumination lamp
must light, then.
5) If such voltage is lower than 9.9V, correct it by using the
semi-variable resistor (VR104) on the printed wiring board.
Note:
This adjustment shall be after “‘VU Indicator Sensitivity
Adjustment”’.
VU Meter Sensitivity Adjustment
1) Connect a VTVM to both ends of the resistor (R453 or
R454) ‘on the record/playback amp. printed wiring board.
2) Set the function selector switch to “‘tape’’ and the
recording mode selector switch to “‘manual”’ position.
3) Short pins @ and © at the secondary side of the bias
oscillation coil (L801) to stop the oscillation.
4) Connect an audio generator (1 kHz) to the external micro-
phone input socket, line/phono input socket, and mixing
microphone socket in order, and check their recorded
Record/Playback
Regulated power supply (DC15V)
Note:
For some heads, there may be a phase difference between
right and left channels when the output is made maximum.
In this case, adjust the head azimuth so that such phase
difference will be as small as possible while keeping the
output still maximum.
Tighten the screw in the proper direction by using the
adjusting screw.
5) Even without using the oscilloscope, also adjust the head
azimuth adjusting screw so that outputs of both the right
and left channels attain the maximum and the same phase
in right and left.
Oscilloscope
Line output socket
(Left channel)
Playback
Line output socket
(Right channel)
Figure 12-3
at |
— ee 2 — ct a a a
APED 2 oa Se td
onaartet irish vee
Figure 12-4
Battery terminals
Playback mode
Figure 12-5
outputs according the following step 5) and 6).
Caution:
For the input to the external microphone input socket, it
must be applied across the right and left channels.
5) Adjust the recording control knob so that the VTVM
indicates 0.4 mV.
6) Adjust the meter sensitivity adjusting semi-variable resistor
(VR105 or VR106) so that the pointer of the level meter
may be in the “0” position.

Oscilloscope
Recording input socket (external) microphone
input socket, line/phono input socket and mixing
microphone socket
Audio generator Attenuator
©
Record mode
R453 or
R454
Figure 13-1
Record Amplifier Sensitivity Check
1) Connect a VTVM to both ends of the resistor (R453 or
/ a Baa Sockets Inputs
R454) on the record/playback amp. printed wiring board. =
2)
Short
pins
@
and
©
at
the
secondary
side
of
the
bias
External
microphone
input
ae
feed
oscillation
coil (L801)
to
stop
the
oscillation.
~
3)
Set
the
function
selector
switch
to
“‘tape’’
and
the
deck-2
Mixing
microphone
eae
saute
tape
selector
swtich
to “‘normal”
position.
vos
4) Place the unit in record mode, and check if the VTVM Line input 0.06V ~0.13V
reading becomes 0.2mV with the respective inputs tabu- (—21 +3dB)
lated below — the input oscillation frequency is set to Ear 1.0mV ~ 2.0mV
1 kHz and 0 dB = 1 V is assumed. pana (—57 +3dB)
Note:
For the input to the external microphone input socket, it
must be applied across the right and left channels. se raiiceies
Input sockets VM,
Playback Amplifier Sensitivity Check
1) Connect a VTVM, across a 4 ohm resistor, to the external Audio generator Attenuator Record mode
speaker socket.
2) Set the function selector switch to “‘tape’’, the treble/bass
tone control knob to “‘center’’ and the volume control
knob to ““10/max.”’ position.
R453 or R454
Figure 13-2
3) Reproduce a test tape (TEAC, MTT-118, 1 kHz,
250 pWb/mm, —10 dB prerecorded).
4) At the time, the VTVM must read approx. 2.0V.
5) Then connect the VTVM to the line output socket and the welt Sicaiodses
deck-1 monitor output socket in order, then the VTVM socket, line output _V.T.V.M,
reading must be approx. 200mV for the former, and
approx. 10mV for the latter.
Playback mode
Test tape
MTT-118
Note:
For
measuring
the
output
from
the
deck-1
monitor
output
socket,
the
test
tape
be
played
through
the
use
of
the
Record/Playback
lead * Line
socket or deck-1
monitor output
socket
* External speaker socket; 4 ohms
output socket; 50K ohms
+ Deck-1 monitor output socket; 8 ohms
deck-1.
Figure
13-3
Record/Playback Sensitivity Check
1)
Connect
a
VTVM,
across
a
4
ohm
resistor,
to
the
external
main
speaker
socket.
2)
Set
the
function
selector
switch
to
“tape”,
the
deck-2
tape
selector
switch
to
“normal”,
the
treble/bass
tone
control
knob
to
“center”,
the
volume
control
knob
to
“*10/max.””,
©)
the
recording
level
control
knob
to
“max.”
and
the
Audio generator Attenuator
External microphone input sockets
Record mode Record/Playback
head
Normal tape
MTT-502
recording
mode
selector
switch
to
“manual”,
position.
3)
Connect
an
audio
generator
to
the
external
microphone
input
sockets
of
both
channels,
and
apply
a
1
kHz
signal
of
output
level
—78dB
(0.126
mV,
0dB
=
1V)
to
these
sockets
at
a
time.
4)
Record
this
signal
on
a
normal
tape
(TEAC,
MTT-502).
5)
Reproduce
this
recorded
tape,
then
the
VTVM
must
read
Oscilloscope
Playback mode
External speaker socket
approx.
1.5
V.
Figure
13-4

GENERAL ALIGNMENT INSTRUCTION
Should it become necessary at any time to check the alignment of this receiver, proceed as follows:
1. Set the volume control (VR508) to maximum. 5. Set the function selector switch (SW102) to “radio”
2. Attenuate the signals from the generator enough to swing position.
the most sensitive range of the output meter. 6. Set the fine tuning control (C60) to mechanical center
3. Use a non-metallic alignment tool. position.
4. Repeat adjustments to insure good results.
AM IF/RF ALIGNMENT
(Refer to Figure 15-9)
TEST SIGNAL GENERATOR RECEIVER
STEP|BAND | craGE | CONNECTIONTO | INPUT SIGNAL ee canues ROUSE
RECEIVER FREQUENCY
i Refer to Figure 15-1. Exactly 455 kHz: High end of dial. Adjust for Adjust the AM
1 Mw IF (GF-777H) (minimum capac- best “IF” IF transformers.
Exactly 468 kHz: ity) curve (T3, T4)
(GF-777E) it
Refer to Figure 15-2. Exactly 145 kHz. Low end of dial. Adjust for Adjust the LW
2 LW (400 Hz, 30%, AM (maximum capac- maximum oscillation coil (L9).
Band | toailetet ity). output.
|— -—---+-—-. +} a a
Coverage Same as step 2. Exactly 295 kHz. High end of dial. Same as step 2. Adjust the LW
3 LW (400 Hz, 30%, AM (minimum capac- oscillation trimmer
modulated) ity). (C71).
Same as step 2. Exactly 170 kHz. 170 kHz. Same as step 2. Adjust the LW
4 LW (400 Hz, 30%, AM bar antenna coil (L7).
Hack: modulated) See [Note A] A}.
|—___+————_| Tracking
Same as step 2. Exactly 270 kHz. 270 kHz Same as step 2. Adjust the LW
5 LW (400 Hz, 30%, AM antenna trimmer
modulated) (C58).
6 LW Repeat steps 2, 3, 4, and 5 until no further improvement can be made.
Same as step 2. Exactly 510 kHz, Low end of dial. Same as step 2. Adjust the MW
7 MW (400 Hz, 30%, AM (maximum capac- oscillation coil (L10).
Band modulated) ity). ;
Coverage Same as step 2. Exactly 1650 kHz. High end of dial. Same as step 2. Adjust the MW
8 Mw (400 Hz, 30%, AM (minimum capac- oscillation trimmer
modulated) ity). (C69).
|e ee
Same as step 2. Exactly 600 kHz. 600 kHz. Same as step 2. Adjust the MW
9 MW (400 Hz, 30%, AM bar antenna coil (L7).
modulated). See |Note A] .
-——_——, Tracking
Same as step 2. Exactly 1400 kHz. 1400 kHz. Same as step 2. Adjust the MW
10 MW (400 Hz, 30%, AM antenna trimmer
modulated) (C56).
11 MW Repeat steps 6, 7,8 and 9 until no further improvement can be made.
Refer to Figure 15-3. Exactly 5.85 MHz. Low end of dial. Same as step 2. Adjust the SW
12 sw (400 Hz, 30%, AM (maximum capac- oscillation coil (L11).
Band modulated) ity)
Coverage Same as step 12. Exactly 18.5 MHz. High end of dial. Same as step 2. Adjust the SW
13 SW (400 Hz, 30%, AM (minimum capac- oscillation trimmer
| modulated) ity) (C67).
Same as step 12. Exactly 6.5 MHz. 6.5 MHz. Same as step 2. Adjust the SW
14 sw (400 Hz, 30%, AM antenna coil (L8).
modulated) :
Tracking
Same as step 12. Exactly 16 MHz. 16 MHz. Same as step 2. Adjust the SW
15 sw (400 Hz, 30%, AM antenna trimmer
modulated) (C54).
ra
16 SW Repeat steps 12, 13, 14 and 15 until no further improvement can be made.
Check the alignment of the receiver antenna coil by requires less inductance. Change loop inductance by sliding the
bringing a piece of ferrite (such as a coil slug) near the antenna bobbin toward the center of ferrite core to increase induct-
loop stick, then a piece of brass. If ferrite increases output, ance, or away to decrease inductance.
loop requires more inductance. If brass increases output, loop
—14—

OSCILLOSCOPE
MW/LW
SIGNAL
GENERATOR
TEST
LOOP
BAR
ANT.
(J111,
J112)}
SWEEP TRIGGER MY
Figure 15-1
AC V.T.V.M
SIGNAL Mw/LW
GENERATOR
TEST LOOP BAR ANT.
Figure 15-2
[> To TEST POINT (TP1)
cpa R c R = 30 ohm
1 ral =
1x Z = 50 ohm 2. ERR
i a Z: Output impedance of signal generator muon
SIGNAL TO CHASSIS GND (TP2)
GENERATOR
TP2 (GND)
Figure 15-3
Oscilloscope “S" curve
SIGNAL GENERATOR
:
el Art
AMPLIFIER °
,O « ° ° o” “ol 4
TP2 (GND) TP4 (GND
| SWEEP TRIGGER, ,,, fen)
Figure 15-4
THE INSTRUCTION OF FREQUENCY ADJUSTMENT
In order to comply with FTZ
rule: Nr. 358/1970, please fix
the low end of dial frequency
(87.5MHz) and the high end of
dial frequency (107.9MHz) on
FM band, by adjusting oscilla-
tion coils (L4) and oscillation
trimmer (C19), respectively, as
illustrated in Figure 15-9.
C58 LW ANT.-
L2,L3 FMR
T1 FM IF
R21 FM Muting
—15—
AC V.T.V.M,
DUMMY (See Fig. 17-6)
SIGNAL GENERATOR
R1
TO TEST POINT (TP1)
R1 = 37.5 ohm
= 75 ohm
= R2 = 75 ohm
WB) R1 = 50 ohm
= 50 ohi
1 2 Ohne a /50 on
TO CHASSIS GND (TP2)
Z: Output impedance of signal generator
Figure 15-6 FM DUMMY
FREQUENCY
100 K ohm COUNTER
SIGNAL GENERATOR DUMMY (See Fig. 15-6)
TP2 (GND)
Figure 15-7
DUMMY (See Fig. 15-6)
D603 STEREO
SIGNAL
amg
FE
Zag
=
INDICATOR
TP2 (GND)
Figure 15-8
TP7 T4 TP3
AM IF
TP6 R27 VCO Adjust.
Figure 15-9

FM IF/RF ALIGNMENT
@
Set
the
wave-band
selector
switch
(SW1)
to
“FM”
position.
@
Set
the
FM
mode/FM
mute
switch
(SW108)
to
“stereo”
position.
(Refer to Figure 15-9)
>
— SIGNAL GENERATOR RECEIVER
STEP | BAND P ADJUSTMENT
STAGE CONNECTION TO | INPUT SIGNAL oak SEG BERRI
RECEIVER FREQUENCY
IF Refer to Figure 15-4. Exactly 10.7MHz. High end of dial. Adjust for best Adjust the FM
(Unmodulated) (minimum capacity) “S" curve. IF transformers
1 FM See 1. (T1)
Note B :
ote
2.
(T2)
Refer to Figure 15-5 Exactly 87.1MHz. Low end of dial. Adjust for | Adjust the FM
2 and 15-6. (400Hz, 30%, FM (maximum capacity) | maximum oscillation coils
ei Band modulated) output. (L4).
Coverage Same as step 2. Exactly 109MHz. High end of dial. Same as step 2. Adjust the FM
3 (400Hz, 30%, FM (minimum capacity) oscillation trimmer
modulated) (C19).
Same as step 2. Exactly 88MHz. 88MHz. Same as step 2. Adjust the FM
4 (400Hz, 30%, FM RF coils (L2, L3).
modulated)
FM Tracking
Same as step 2. Exactly 108MHz. 108MHz. Same as step 2. Adjust the FM
5 (400Hz, 30%, FM RF trimmer (C4).
modulated)
6 FM Repeat steps 2,3, 4 and 5 until no further improvement can be made.
| A ae ees EE
Color Mark
Color Mark
There are 5 kinds of ceramic filters (CF1, CF2) available
with this unit and they are given color indication as
tabulated below to differentiate the central frequency from
one to another among them. When using them, be sure to
make the two of the same type a pair.
When other ceramic filters than the one (red) having the
central frequency of 10.7 MHz are used, note that a marker
(10.7 MHz) of FM sweep generator, if used, will be deviated
— therefore, adjust the generator by putting off the
marker.
1. Input
2. GND
3. Output
10.64MHz +30kHz
| D | Black: |
Central
|
B
|
Blue:
|
10.67MHz+30kHz
frequency
|
A
|
Red:
—
[
10.70MHz
+30kHz
(fo)
10.73MHz
+30kHz
E | White: | 10.76MHz+30kHz
FM STEREO ALIGNMENT
@
Set
the
function
selector
switch
(SW102)
to
“radio”
position
and
FM
mode/FM
mute
switch
(SW108)
to
“‘stereo/mute”
position.
—
STEP
_—
SIGNAL GENERATOR
-
RECEIVER
ad
CONNECTION TO
RECEIVER
INPUT SIGNAL
FREQUENCY DIAL SETTING
REMARKS
ADJUSTMENT
Refer to Figures 15-6
and 15-7.
Exactly 98MHz (54dB) 98MHz
unmodulated. +0.1kHz.
Adjust for 19
ing semivar
variable res
Turn the FM muting sensitivity adjust-
iable resistor (R21) fully
counterclockwise. Adjust the semi-
istor (R27)
FM
STEREO
INDICATOR
LIGHTING
LEVEL
ALIGNMENT
©
Set
the
function
selector
switch
(SW102)
to
“radio”
position
and
FM
mode/FM
mute
switch
(SW108)
to
“stereo/mute”
position.
=F
SIGNAL
GENERATOR
RECEIVER
FM
EP
ND
7
ADJUSTMENT
SiLEr
BA
STAGE
CONNECTION
TO
|
iNPUT
SIGNAL
ser
TiNG
Scans
RECEIVER FREQUENCY
i
Refer
to
Figures
15-6
Exactly
98MHz
98MHz
Adjust
for
the
Adjust
the
semi-variable
Ss
and
15-8.
(20dB).
(19kHz,
indicator
starts
resistor
(R21).
:
id
eee
10%,
FM
lighting.
modulated)
—16=

NOTES
ON
SCHEMATIC
DIAGRAM
-
Ref.
No.
Names
of
Switch
|
Swi
(A,
B)
Wave
Band
Selector
Switch
SW101 (A ~ L) | Record/Playback Switch
SW102 (A, B)
| SW103 (A ~D)
SW104 (A)
| SW105 (A, B)
| SW106 (A, B)
SW107 (A ~ D)
Function Switch
Recording
Mode
Switch
Manual-Auto
Dubbing
Switch
on-off
Deck 1 Tape Selector Switch
Deck 2 Tape Selector Switch
[ Meter Selector/Dial Light Switch
Tape-Radio-Line in/Phono
Switch Position
FM-SW, -SW, -AM
Playback-Record
Metal/CrO, -normal
Metal-CrO, -normal
VU/off-Tune/Batt/on
SW108
(A,
B)
FM
Mode/FM
Muting
Switch
Stereo/Mute-Stereo-Mono
SW301
SNRS
Switch
on-off
SW401
(A,
B)
Input
Selector
Switch
Line
in-Phono
|
SW501
(A
~
D)
Mixing
Switch
Radio
Echo/on-on/off-off/off
SW502
(A,
B)
Loudness
Switch
[
on-off
|
sw6o1
APLD
UP
Switch
on-off
|
Sw6o2
APLD
DOWN
Switch
on-off
sw701
;
Deck
1
Main
Switch
©
on-off
SW702
Deck
2
Main
Switch
©
on-off
|
sw703
Deck
1
Main
Switch
on-off
|
SW704
Deck
2
Main
Switch
on-off
SW705
Deck
1
APLD
Switch
on-off
|
Sw707
Deck
1
APLD
Cut
Switch
on-off
SW709 (A, B)
SW710
Deck Mode Selector Switch
Deck 1 Main Switch ®
5x or
fe 2-1 *g 2
on-off
SW711
Deck
2
Main
Switch
@
on-off
SW712
Editing
Switch
on-off
|
SW713
Pause
Switch
TET
secre
SW801
Power
Switch
__|_
on-off
SW806
(A,
B)
Beat
Interference
Cancelling
Switch
A-B-C
sws901
AC/DC
Selector
Switch
AC-DC
SWw902
AC
Supply
Voltage
Selector
Switch
Syl
10-220-240V
1.
Parts
marked
with
“a”
(
)
are
important
for
mainiain-
4.
As
to
electrolytic
capacitor,
the
expression
“capacitance/
withstand voltage”’ is used.
5.
For
voltages
at
each
point
of
the
tuner,
they
are
indicated
in
parentheses
for
AM
and
the
values
without
parenthese
are
for
FM.
In
any
case,
the
voltage
is
measured
with
no
signal
given,
by
using
VTVM.
6.
Attention
should
be
drawn
to
voltage
and
the
relevant
conditions
below.
Audio
voltage
—
in
play
mode
and
under
no
signal
in
microfarad.
P
=
picofarad
condition.
Parenthesized
parts
voltage
—
under
record
*
The
types
of
capacitors
are
seen
from
the
symbols
ML
condition.
PHONO
circuit
voltage
—
in
PHONO
made
ON
{mylar
capacitor).
Styrol
(polystyrene
film
capacitor)
position.
and
CH
(temperature
compensating
ceramic
capacitor).
ing
the
safety
of
the
set.
Be
sure
to
replace
these
parts
with
specified
ones
for
maintaining
the
safety
and
performance
of
the
set.
2.
To
differentiate
the
units
of
resistors,
such
symbols
as
K
and
M
are
used:
the
symbol
K
means
1000
ohms
and
the
symbol
M
means
1
Meg.
ohm
(1/4
W).
3. Capacitor
*
Unless
otherwise
specified,
any
capacitance
is
expressed
SERVICING OF LEG-LESS TYPE RESISTORS AND CAPACITORS
method different from that for the oridnary type of resistors
and capacitors.
The leg-less type resistors and capacitors are available in either
of the tubular and square shapes, and here’s their servicing
y=
Removal of the Tubular-Shaped Tip
‘lr
Using a soldering iron, heat the solder at each terminal of
the tip to get it absorbed into a braided wire applied
thereon. See Fig. 18-1.
. Holding the tip with a pincette, take it off gently using the
soldering iron’s heat applied on each terminal of it. See
Fig. 18-2.
Removal of the Square-Shaped Tips
1.
Using a soldering iron, heat the solder at each terminal of
the tip to get it absorbed into a braided wire applied
thereon. See Figure 18-3.
. Holding the tip with a pincette, take it off gently using the
soldering iron’s heat applied on each terminal of it. See
Figure 18-4.
Cautions on removal:
1;
2.
3:
4.
When handling the soldering iron, use a proper force and
keep a careful manner.
When removing the tip, do not use undue force with the
pincette.
The soldering iron in use should operate on AC 100V
(400W); it is best if provided with a thermal control (240°
or so).
The tip once removed must not be used again.
Attachment of Tubular-Shaped Tip
I.
2
Temporarily solder one terminal of the tip on the copper
foil surface. See Fig. 18-5.
Holding one end of the tip with a pincette, completely
solter both terminals of it one after another. See Fig. 18-6.
Attachment of Square-Shaped Tip
l.
2.
Temporarily solder one terminal of the tip on the copper
foil surface. See Fig. 18-7.
Holding one end of the tip with a pincette, completely
solder both terminals of it one after another. See Fig. 18-8.
Cautions on attachment:
1.
When soldering the tip terminals, do not touch them
directly with the soldering iron. The soldering must be as
quick as possible being careful not to hurt the terminals and
the body itself.
. When touching the tip with a pincette, hold its terminal but
never its body. See Figs. 18-6 and 18-8.
. Keep the tip’s body in contact with the P.W.B. when
soldering.
. The soldering iron in use should operate on AC 100V
(40W); it is best if provided with a thermal control (240°C
or so).
. The soldering amount must be enough but not be outside
the specified area.
General Cautions on Handling and Storage
iF
2.
Oxidization on the tip’s terminals results in poor soldering.
Do not handle them with bare hands.
For storage, avoid the following places where oxidization
will occur and their capacitance or resistance will be
deteriorated.
1) Sulfur or chlorine gas floating places
2) Directly sunlit places
3) High temperature/high humidity places
Braided
Tubular tip wire
Soldering iron
Copper foil
older
surface 3
P.W.B. Adhesive
Figure 18-1
Pincette
Tubular tip
Soldering i
Copper foil PIngsron
surface
ee
P.W.B. Adhesive
Figure 18-2
Braided
Square tip wire
Soldering iron
Copper foil
surface Solder
P.W.B. Adhesive
Figure 18-3
Pincette
Square tip
Soldering iron
Copper foil
surface
P.W.B. Adhesive
Figure 18-4
Soldering iron
Solder
Copper foil
surface
a... oaoS“c=”M(S SS ———
P.W.B.
Figure 18-5
Soldering iron
Solder
Pincette
Solder
Copper foil
surface
P.W.B. Tubular tip
Figure 18-6
Solder
Copper foil Soldering iron
surface
ST <0.
P.W.B.
Figure 18-7
Soldering iron
Pincette
Copper foil
surface
P.W.B. Square tip
Figure 18-8

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Built-in
Microphone
ioaoe
Dr:
Specifications or wiring diagrams of model are subject to change for the improvement without prior notice.
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Figure 19 SCHEMATIC DIAGRAM (1/2)
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Specifications or wiring diagrams of model are subject to change for the improvement without prior notice.
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Deck
2
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N
REMOTE
Transistor |Selector | Emiter |Collector| Base
Switch
Metal | 0.46V | 78V OV Metal 8.8V 9.91V 9AV
0804 CrO2 0.32V | 5.3V 0.15V | | Q806 | CrOz 5.6V 9.88V 6.66V
Normal | 0.22V 3.75V |0.3V Normal | 4.18V | 9.86V 4.83V
Metal |0.46V | 7.8V_ [OV Metal | 99V | 15V_ | 10.5V |
Q805 0.32vV | 5.33v [0.14v|/0807[cro. [99V [| 15V | 105Vv |
0.22V | 3.75V_ |0.3V Normal | 99V | 15V_ | 10.5V |
8
Figure 23 SCHEMATIC DIAGRAM (2/2)
9
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