Sony MHC-790 User manual

MHC-790
SERVICE MANUAL AEP Model
« MHC-790 is composed of the models below. Service SPECIFICATIONS
manuals are issued for each of the component models,
Power requirements
' so please refer to each of the manuals.
220 — 240V AC, 50Hz
Power consumption
COMPONENTS
MODEL
140W
. Dimensions Approx. 280 X 325 X 335 mm (w/h/d)
TUNER, DECK, REMOTE
CD, PLAYER, AMp| SPEAKER
incl. projecting parts and controls
HCD-H790 RM-S33
Mass Approx. 8.3kg
SS-H790 Design and specifications are subject to change without notice.
MINI Hi-Fi COMPONENT SYSTEM
SONY.

PARTS LIST
NOTE:
@ Abbreviation
@ Items marked “ * ”are not stocked since
they are seldom required for routine
G : German
service. Some delay should be antici- IT: Italian .
pated when ordering these items. EE : East Europian
Ref.No. Part No.
1-467-967-11
1-501-721-21
1-501-594-11
3-798-608-41
3-798-608-51
3-798-608-61
3-798-608-71
3-798-608-81
3-798-608-91
4~941-762-01
* 4-981~842-01
9-960-595-11
AED: Norway,Sweden,Finland, Denmark
Description Remark
REMOTE COMMANDER (RM-S33)
ANTENNA, LOOP
ANTENNA (FM)
MANUAL, INSTRUCTION
(FRENCH/SPANISH/PORTUGUESE/DUTCH) (AEP)
MANUAL, .INSTRUCTION (GERMAN) (G)
MANUAL, INSTRUCTION (ITALIAN) (AEP, IT)
MANUAL, INSTRUCTION (ENGLISH/GERMAN)
(AEP, EE)
MANUAL, INSTRUCTION (RUSSIAN/POLISH) (EE)
MANUAL, INSTRUCTION
(SWEDISH/DANISH/FINNISH) (AED)
COVER, BATTERY (FOR RM-S33)
INDIVIDUAL CARTON
Sony Corporation
Consumer A&V Products Company
Home A&V Products Div.
—?—
English
96B020443-1
Printed in Japan
© 1996.2
Published by Home A&V Products Div.
Quality Engineering Dept.

HCD-H790
SERVICE MANUAL AEP Model
9-960-594-11
Page
HCD-H801
Model HCD-H790 is almost same as HCD-H801.
As only the difference from HCD-H801 is described in this manual,
please refer HCD-H801 service manual for the other section.
HCD-H790
No. Part No. Description
* 5 4-980-806-01 PANEL, BACK (AEP)
* 5 4-980-806-11 PANEL, BACK (G)
* 5 4-980-806-21 PANEL, BACK (1T)
* 5 4-980-806-41 PANEL, BACK (EE)
or
1 X-4946-931-1 LID(A)ASSY, CASSETTE
2 X-4946-932-1 LID(B)ASSY, CASSETTE
4 4-971-955-21 PANEL, LOADING
5 4-971-956-21 BUTTON (EJ-A)
6 4-971-957-21 BUTTON (EJ-B)
9 X-4946-938-1 BRACKET (VOL) ASSY
oom oO OT
102 4-971-901-51 PANEL FRONT
104 4-971-905-01 BUTTON (EQ)
105 4-971-902-02 WINDOW (FLD)
106 4-971-913-21 BUTTON (POWER)
107 X-4946-937-1 BUTTON (CURSOR) ASSY
108 4-971-907-11 BUTTON (STR-B)
110 X-4946-936-1 BUTTON (STR-A) ASSY
111 X-4946-935-1 BUTTON (F/T) ASSY
115 4-972-642-21 BUTTON (TC-STOP)
116 X-4946-939-1 BUTTON (TC-PLAY) ASSY
117 4-970-880-31 BUTTON (KARAOKE)
121 X-4946-934-1 BUTTON(CD) ASSY
e@ Abbreviation NOTE :
G : German @ Items marked “ * ”are not stocked since
IT : Italian they are seldom required for routine
EE : East European service. Some delay should be antici-
pated when ordering these items.
COMPACT DISC DECK RECEIVER
SONY.
. English
Sony Corporation 96B020443-1
Consumer A&V Products Company ee © ee
Home A&V Products Div. Published by Home A&V Products Div.
Quality Engineering Dept.

HCD-H801
SERVICE MANUAL
@ HCD-H801 is the tuner, deck, CD and
amplifier section in FH-G80.
® HCD-H801 is the tuner, deck, CD and
amplifier section in MHC-801.
AEP Model
UK Model
E Model
Australian Model
Photo : AEP Model
CD
Ne
00.053
Section
Tape deck
Section
SPECIFICATIONS
CD player section
System Compact disc digital audio
system
Laser Semiconductor laser
Wavelength 780-790 nm
Frequency response
2 Hz - 20 kHz
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 — 108.0 MHz (50 kHz
step)
Aerial FM lead aerial
Aerial terminals
75 ohm unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
AEP, UK, East European, German model :
MW : 531- 1,602kHz
LW : 153-279kHz
Italian model :
MW : 522- 1,611kHz (9kHz step)
LW : 153-279kHz
E, Saudi Arabia, Argentine, Hong Kong, Mexican,
Malaysia, Singapore, Australian model :
MW: 531 - 1,602 kHz
(9 kHz step)
530 — 1,710 kHz
(10kHz step)
SW: 5.95 - 17.9 kHz
(E3, Saudi Arabia, Hong Kong,
Malaysia, Singapore model)
Aerial AM loop aerial
External aerial terminals
Intermediate frequency
450 kHz
Tape player section
Recording system
: 4-track 2-channel stereo
Frequency response
(DOLBY NR OFF)
40 ~ 13,000 Hz (+3 dB),
using Sony TYPE I cassette
40 — 14,000 Hz (+3 dB),
using Sony TYPE II cassette
Wow and flutter
0.1% WRMS +0.3% (DIN)
— Continued on page 2 —
COMPACT DISC DECK RECEIVER
SONY.

Amplifier section
Peak music power output
1000 W
Continuous RMS power output
68 + 68 W (6 ohms at 1 kHz,
5% THD)
Inputs
AUX IN: Sensitivity 450 mV,
impedance 47 kilohms
Outputs
PHONES (stereo phone jack):
accept headphones of
8 ohms or more.
SPEAKER: accept impedance of 6 to
16 ohms.
SURROUND SPEAKER:
accept impedance of 16
ohms.
(Singapore, Malaysia,
Mexican model)
accept impedance of 8 to 16
ohms. (EXCEPT Singapore,
Malaysia, Mexican model)
Speaker section
Speaker system
3-way system
Speaker units Woofer: 15 cm dia., cone
ae Dimensions;
Frequency range
60 Hz - 20 kHz
Sensitivity 87 dB/W/m
Rated impedance
6 ohms
Dimensions Approx. 210 x 325 x
250 mm (w/h/d)
Mass Approx. 3.6 kg net per
speaker
Supplied accessories
AM loop aerial (1)
Remote (1)
Sony SUM-3 (NS) batteries (2)
FM lead aerial (1)
Speaker cables (2)
General
. Power
Destination Power requirements
. q consumption
Australian, Malaysia model | 220 — 240V AC, 50Hz 140W
AEP, German, Italian, East — 230V AC, 50/60Hz LOW
European model
E, Saudi Arabia, Argentine, | 110 — 120V/220V — 240V
Singapore, Hong Kong AC, 50/60Hz Adjustable 140W
model with the Voltage Selector
120V AC, 60Hz 140W
-; Approx..280 x 325 x ;
type i (335 mm (w/h/d) |
Tweeter:
5
cm
dia.,
cone
YP
ined:
Piejecing
parts
and’
ae
type Seitetee sts” controls.
Super tweeter: 2 cm dia., . Mass:.°. - Approx. 8. 3kg (EXCEPT ‘AEP, UK Model)
dome type “ss 4°. Approx. 7.8kg (AEP, UK Model)
Enclosure Bass reflex
. Design and Leis are vee to 2
4. change-without notice. ¢s4.6: eu Shiva
TABLE OF CONTENTS
Section Title Page Section Title Page
Specifications *+++++-2+cesssecccerseenvervsvesovsensnnsccsensnosaasveneseness l 7. EXPLODED VIEWS
ey rae SE st ao aaa ad odode aa aa alee hsneza SSulese Weds $3
1: SERVICING NOTES & 0m .sseevecteeceeev eens vcceseesastesereneonss 3 WD Fane Rael SE toil wae se Sela aheousstseeasadopedsccd 55
7-3. Front Panel Section-2 Pome merece eee e eee ee ee es ee eeeeseeeeeese 56
. Macnee Aue COLES LSKe ee roneria Aehe enon nae 4 TAo TC Mechanism Secon | -ettatwatetieesrentecdscacapetss 57
(TCM-220WR2)
3. DISASSEMBLY 7-5. TC Mechanism Section-2:etrrerssesetereeeeereeeceeeseeeenes 58
CME BIEMU (rc er Cr wot ite Ror reer reer eer eee 6 (TCM-220WR2)
3-9 “Front Panel Renrvoval esnxtsscavenvssgass anenararsraiersacens 6 9.6 TC Mechanisin: SEGHOIe 3818) oie end Aiton sasencadocceaerebecn 59
3-3 "TOC Mechanisin Removal os errsavmnon eaves ees tecdeenes a (TCM-220WR2)
7-7. CD Mechanism Section-1 (CDM28-5BD19) +1+++++++++ 60
4. ADJUSTMENTS :--- ede’ ya Wh acne onmeaoes sada Ba Ghua le se Seameoeesas Fi 9 7-8. CD Mechanism Section: 24 BU-SBDI9) es cuewnes 61
4-1. Mechanical Adjustments eee eee cece ene n erect reece ee eereseeeees 8
4-2. Electrical Adjustments++++++++++++ssessereseceeceseesenennees 8 8. ELECTRICAL PARTS LIST --:-:::ccccecsecececeentenee enter es 62
5. EXPLANATION OF IC TERMINALS ------+-+----+-esseeee 14
6. DIAGRAMS
6-1. Block Digeram== CD Séetion = sesieaeteictintians 19
6-2. Block Diagram — Main Section — :rrrrrrrersereeee seen 21
6- 3 Circuit Board Location Pee mere rene recor oeseeeereeessessene 26
6-4. Printed Wiring Boards — Main Section — -+++++++++++- 27
6-5. Schematic Diagram — Main Section — srrrre+eseeeeee ee 3]
6-6. Schematic Diagram — Panel Section — -+r++++ereeeeee ee 36
6-7. Printed Wiring Boards — Panel Section — -+++++++++++- 39
6-8. Printed Wiring Boards — BD Section —-+++++++++eeeeee 41
6-9. Schematic Diagram — BD Section — -rrrrseeeee eres eee 42
6-10. Printed Wiring Boards — Audio pechery Fe Meese NSN eS 46
6-L1. Schematic Diagram — Audio Section — ++++rrrereereee 48
6-12. IC Block Diagrams — Main Section — -++++e+eeeeeeeee |

MODEL IDENTIFICATION
— BACK PANEL —
4-971-977-0(]: AEP (AE1) model
4-971-977-1]: AEP (AE2) model
4-971-977-2(_]: IT model
4-971-977-3L: G model
4-971-977-4[_]: UK (UK2) model
4-971-977-5(_]: EE model
4-971-977-6L_]: AEP (AE1) model
4-971-978-0(_]: E model
4-971-978-1]: EA model
4-971-978-2[_]: AUS model
4-971-978-3(]: SP model
4-971-978-4(_] : MX model
4-971-978-5[_]: MY model
4-971-978-61]: AR model
4-971-978-7[_]: HK model
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emission,
observe more than 25cm away form the objective lens.
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
@ Code number of Chuck Plate Jig : X-4918-255-1
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as a
CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
m CLASS 1 LASER PRODUCT
LUOKAN 1 LASERLAITE
m KLASS 1 LASERAPPARAT
This caution
label is located
inside the unit.
CAUTION ; INVISIBLE LASER RADIATION WHEN OPEN,
AVOIO EXPOSURE TO BEAM.
> USYNLIG LASERSTRALING VED ABNING NAR
ADVARSEL ; SIKKERHEOSAFBRYOERE ER UDE AF FUNKTION,
UNOGA UDS ZTTELSE FOR STRALING.
VARO! ; AVATTAESSA JA SUOJALUKITUS OHITETTAESSA
OLET ALTTIINA LASERSATEILYLLE.
te rere nree aoe emanating as
VARNING _ ; LASERSTRALING NAR DENNA DEL AR OPPNAD
OCH SPARREN AR URXOPPLAD,
earn nnemetiania
ADVARSEL 3; USYNUG LASERSTRALING NAR DEKSEL APNES
UNNGA EKSPONERING FOR STRALEN.
CAUTION
Use of controls or adjustments or performance
of procedures other than those specified herein
may result in hazardous radiation exposure.

SECTION 2
GENERAL
This section is extracted from
instruction manual.
SEE a ee, SE eae a ee
index to Parts and
Controls
Refer to the pages indicated in parentheses
for how to use the controls.
Controls with an asterisk have indicators
on themselves.
Front Panel
CD player
[1] SYSTEM POWER ON/STAND BY
switch (7)
[21 CD trav (7)
(3] 2 OPEN / CLOSE button (7)
[4j (stop) button (7)
00 (play and pause) button* (7)
[6] CD operating buttons
CONTINUE button (8)
SHUFFLE button (8)
PROGRAM button (8)
Tuner/Amplifier
EQ CONTROL button* (18)
{2] MEMORY button (18)
USER FILE button* (18)
Preset equalizer setting buttons* (17)
[5] DBEB button (17)
[6] SURROUND button (17,21)
CLOGK SET button (6)
VOLUME control (17,19)
[9] DISPLAY button (6,7)
FUNCTION button (8,14,21)
Timer operating buttons
TIMER SET button (19)
DAILY button (19)
TIMER REC button (20)
(12) Tuner operating buttons
TUNING MODE button (10,20)
MONDO button (10)
[13] TUNER MEMORY button (11)
Jog dial (6,7,10,14,19)
ENTER/NEXT button* (6,11,19)
TUNER/BAND button* (10,15,20)
Tape player
eed
E, EA, AR, HK, MX,
MY, SP, AUS model
[1] @ REC button* (13)
[2] HIGH SPEED DUBBING button (16)
[3] DOLBY NR button (12)
[4] DIRECTION button (12)
CD SYNCHRO button (13)
[6] §f PAUSE button* (12)
DECK A/DECK B button and A/B
lamps (12)
[8] & EJECT button (for deck A) (12)
[9] PHONES jack (17)
10) MIX MIC jacks (21)_
MIC VOLUME control (21) | E, EA, AR, HK, MX,
4] ECHO VOLUME control (21), MY, SP, AUS model
Tape compartments (12)
KARAOKE PON/MPxX button (21)
EJECT button (for deck B) (12)
PP (fast rightward) (12)
<4 (fast leftward) buttons (12)
@ (stop play) button (12)
(18] c (front side play)* (12)
<J (reverse side play) buttons* (12)

Rear panel
AEP, G, IT, EE, UK model
FM 75 Q COAXIAL terminal (4) :
AEP, G, IT, EE, UK model
FM 75 Q terminal (4) :
E, EA, AR, HK, MX, MY, SP, AUS model
+h earth terminals (4)
AM terminal (4)
AUX IN jacks (21)
SPEAKER connectors (4)
[6] SURROUND SPEAKER connectors (21)
[7] + ground terminal (4)
Mains lead (5)
[9] VOLTAGE SELECTOR (5):
E, EA, AR, HK, MX, MY, SP, AUS model
Display window
Spectrum analyzer (18)
Tape direction indications (12)
Tuner indications (10)
DOLBY NR indication (12)
Karaoke indication (21)
[6] TIMER/DAILY/REC/SLEEP indication
(19,20)
DBFB/SUR indications (17,21)
Function indication (14,16)
{9] AUTO/TUNING/PRESET/STEP
indications (10,11,20)
Frequency/time indication (6,10)
Music calendar (7)
CD play mode indications (8,9)
VOLUME indication (17)
E, EA, AR, HK, MX, MY, SP, AUS model
Remote (RM-S33)
SLEEP button (19)
FUNCTION button (8,14,21)
MD operating buttons
BP (play) button
Hi (pause) button
M@ (stop play) button
[4] CD operating buttons
B (play) button (7)
Hf (pause) button (7)
Mi (stop play) button (7)
Ke / Pi (AMS) buttons (7)
<< />P (fast forward/fast reverse)
buttons (7)
REPEAT button (9)
EDIT button (14)
CHECK button (8,14)
CLEAR button (8)
[5] Tuner operating buttons
BAND button (10,15,20)
PRESET (+/-) buttons (11)
[6] Tape operating buttons
—@ /P buttons (12)
Mi button (12)
<< /P> buttons (12)
[7] TAPE A/B buttons (12)
SYSTEM POWER button (7)
[9] VOL(+/-) buttons (17,19)
* Abbreviations
G : German MX: Mexican
IT : Italian MY: Malaysia
EE :EastEuropean SP: Singapore
AUS : Australian
EA: Saudi Arabia
AR_ : Argentine
HK _ : Hong Kong

SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1.CD MECHANISM REMOVAL
ar he ere @ Tow screws (+BVTP3x8)
02,
@ Wire (Flat type)(21Core)
CN111
@ Disc Table @ CN291 (5Pin)
© Loading panel
3-2. FRONT PANEL REMOVAL
@ Holder PCB
Front Panel Section
© CN103 (5Pin)
@
Three
crows
@
CN102
(6Pin)
@ Wire (Flat type)(17Core)
CN105
© Wire (Flat type)(21Core)
CN401
©@ Wire (Flat type)(11Core)
CN402
@ Tow screws (+BVTP3X8) | @ Two screws (+BVTP3X8)

3-3. TC MECHANISM REMOVAL
@ Five screws (+BVT2.6X 8)
TC Mechanism
@ Lid (B) assy, cassette ;
@ Eject button

SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
record/playback head _ pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer. .
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound
to the parts adjusted.
5. The adjustments should be performed with the rated
power supply voltage unless otherwise noted.
@ Torque Measurement
Meter Reading
Forward
COQ-102C
36
to
61gecm
(0.50 — 0.84 ozeinch)
Wibd6 0060 onsikchs
@ Tape Tension Measurement
|__Mode | Tension Meter | __Meter Reading
CQ-403A more than Ikg (35.2 02)
2 to 6gecm
(0.026 — 0.082 ozeinch)
36 to 61g*cm
(0.50 — 0.84 ozeinch)
CQ-403R more than Ikg (35.2 02)
4-2. ELECTRICAL ADJUSTMENTS
DECK SECTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed for
both L-CH and R-CH.
@ Switch position
DOLBY NR switch : OFF
FUNCTION button : CD
3. Deck section electrical adjustments are made in test mode by
pressing TUNER/BAND, DISPLAY, and POPS at the same
time.
4. Input point and output level measurement point.
Output level
—— measurement Input point
point
21.8mV (- 31¢B) AF OSC
L-CH
Output level attenuator
measurement
point
oe [O
O o——o
Oooo | I
ls o-——_o
CN405
REC(R)
REC(L)
MAIN BOARD
@ Test Tape
|_ Tape | __— Contents =| = Use
WS-48B Tape Speed Adjustment
0 dB=0.775V
Record/Playback Head Azimuth Adjustment
Procedure :
1. Forward Playback mode
Reverse Playback mode
test tape
P-4-A100
(10kHz, ~ 10dB)
Output level measurement point

2. Turn the adjustment screw for the maximum output levels.If
these levels do not match,turn the adjustment screw until both
of output levels match together within 1dB.
L-CH
peak
output within
level 10B
R-CH
eak
Screw P
position
—tr screw angle
L-CH | R-CH
peak peak
3. Playback Mode
test tape
P-4-A100
(10kHz, — 10dB)
L-CH Oscilloscope
Output level measurement point
(see page 8)
screen pattern
4. Change the review playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location :
— record/playback head (Deck A and B)
Tape Speed Adjustment
Procedure :
@ Perform high speed adjustment before normal speed adjust-
ment.
Mode : Playback
test tape
WS-48B
(3kHz, 0dB)
frequency counter
Output level measurement point
(see page 8)
TB | _Rves2
[BP Rves
* Continue to press HIGH SPEED DUBBING switch ($3019) in
playback mode : High speed playback.
% High 5,970 to 6,030Hz
Normal 3,000 to 3,020Hz
Frequency difference between the begining and the end of the
tape should be within + 3%.
Frequency difference between deck A and deck B the biginning
of the tape should be within 1.5%.
Adjustment Location : AUDIO board.
(see page 10)
Playback Level Adjustment
Procedure :
Mode : Playback
test tape
P-4-L300
(31 5Hz, OB)
Output level measurement point
(see page 8)
Deck A is RV311(L-CH) and RV411(R-CH), deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level :
LINE OUT level: — 7.5 + 0.5dB (0.31 to 0.35V)
Level Difference between Channels : within 0.5dB
Confirm the DOLBY OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location : AUDIO board.
(see page 10)

Record Bias Adjustment |DECK B
Procedure :
1. Record mode
AF OSC 1) 315Hz
2) 10KHz
€) attenuator
{e) | errr, |
oo
Il coo |
o—-o O
| es |
blank tape
}
21,8mV(
—
31dB)
CS-123
input point (see page 8)
2. Playback mode
recorded
portion VTVM
Output level measurement point
(see page 8)
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjustment the RV341
(L-CH) and RV441 (R-CH) to repeat step 1 and 4.
Adjustment level : Playback output of 315Hz to playback output
of 10kHz : — 0.5dB to 0.5dB.
(— 1.3 to 1.3mV)
Adjustment Location : AUDIO board. (see page 10)
Record Level Adjustment |DECK B
FUNCTION button : CD
Procedure :
1. Record mode
AF OSC
blank tape
315Hz,
21.8mMV
( —
31dB)
CS-123
€3 attenuator
{e)
ee
o—Oo
Il ooo
o--~-O Oo
Lieeeecwvewennnmasnenll
input point (see page 8)
2. Playbacd mode
recorded
portion
obs ge 8) measurement point
3. Confirm playback the signal recorded in step become
adjustment level as follows.
4, If these levels do not adjustment level, adjustment the
RV401(L-CH) and RV451 (R-CH) to repeat step 1 and 4.
Adjustment Level :
DOLBY OUT level : — 26dB + 0.5dB (36.7 to 41.1mV)
Adjustment Location : MAIN board
Adjustment Location :
[AUDIO BOARD }] — Component side —
RV301 : Playback Level (Deck B L-CH)
RV401 : Playback Level RV651 : Tape Speed (High)
(Deck B R-CH)
RV652 : Tape Speed
(Normal)
RV311 : Playback Level
(Deck A L-CH)
RV341 : Record Bias (L-CH)
RV441 : Record Bias (R-CH)
RV411 : Playback Level
(Deck A R-CH)
{MAIN BOARD] — Component side —
RV401 : Record Level (L)
RV451 : Record Level (R)
‘
CN405 (Input point)
CN404
(Output Level Measurement point)

TUNER SECTION
Note. 1: The adjustment should be performed in the publication. FM Tuned Indication Lighting Level Adjustment
(AM-> FM-> SW) ue Ae
; tape dees roce 4
Note. 2: As a front-end (FEI) is difficult t f faulty, repl .
UIE
er
nist
OE
ie
sibticulb
tovrepale
ib
taully
cplece
1.
Supply
a
11.2”V
(21dBiz)
98MHz
signal
to
the
ANTENNA
it with new one. Penna
AM Section Adjustment 2. Tune the set to 983MHz.
Setting : 3. Adjust RV42 so that the |} TUNED | light up.
4. Confirm that the | TUNED] light off with FM RF signal
generator output level set at 16dBy .
AM ff signal Adjustment Location : Main board
generator
SW OSC Voltage Adjustment
Band : SW
(E3, Saudi Arabia, Hong Kong, Malaysia, Singapore model)
30% amplitude Procedure :
DpoHEacheL 1. Connecct the VOM to JW376 (OSC)
Tune the set to 5.95MHz.
Adjust T2 for 1.0 to 1.1V reading on the VOM.
Tune the set to 17.90MHz.
Adjust CV2 for 8.4 to 8.6V reading on the VOM.
FM Section Adjustment
Setting :
we ae
FM rf stereo signal
generator
FM ANTENNA terminal (TM1) SW Tracking Adjustment
Band : SW
Procedure :
set 1. Connect the VOM to speaker terminal. (TB101)
Carrer
frequency
:
98MHz
2.
Adjust
for
a
maximum
reading
on
VOM.
modulation : 1kHz, 75kHz deviation
Signal generator and Adjustment part
set frequency
1. Set loop antenna A so that the loop antenna B input level
becomes 3.2mV (70dB wu )
2. Tune the set to 999kHz. Adjustment Location : Main board
3. Adjust RV41 so that the [TUNED] light up.
4. Confirm that the light off with AM RF SG output
level set at OdBy .
5. Confirm the FM tuned indication lighting level and adjust if
necessary.
75 Q coaxial
AM Tuned Indication Lighting Level Adjustment
Band : MW
Procedure :
Adjustment Location : Main board
(MAIN BOARD] — Component side —
TM1 ;: Antenna terminal
RV42 : FM Tuning Level
T1 : SW Tracking Adjustment
CVI : SW Tracking Adjustment
T2 : SW OSC Voltage Adjustment
CV2 : SW OSC Voltage Adjustment
RV41 : AM Tuning Level
TB101 : Speaker Terminal

CD SECTION
Note :
1. CD Block basically constructed to operate without adjust-
ment. Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indi-
cated.
3. Use the oscilloscope with more than 10M 92 impedance.
4. Clean an object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment procedure :
oscilloscope
(DC range)
BD board
1. Connect oscilloscope to test point TP (VC) and TP (RF) on
main board.
. Turned power switch ON. (Stop mode)
. Put disc (YEDS-18) in and press the > button.
. Press the DISPLAY/ENTER button. (Tracking servo ON)
. Adjust RV1O1 so that the oscilloscope waveform is as shown
in the figure below (eye pattern).
A good eye pattern means that the diamond shape (<>) in the
center of the waveform can be clearly distinguished.
6. Release test mode after adjustment is completed.
nA WN
@ RF signal reference waveform (eye pattern)
ANY
WA
AYN
NANNY
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
VOLT/DIV : 0.2V
TIME/DIV : 500ns
1.3 + 0.3Vp-p
S-Curve Check
oscilloscope
BD board
Procedure :
1. Connect oscilloscope to test point TP (FEO) and BD board.
2. Connect between test point TP (FOK) and GND by lead wire.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within
3.8 + 1.1Vp-p.
S-curve waveform
symmetry
within 3.8 + 1.1Vp-p
6. After check, remove the lead wire connected in step 2.
Note : @ Try to measure several times to make sure that the ratio of
A:BorB: A tis more than 10: 7.
@ Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
oscilloscope
BD board
—_-
TP (RF) a a +
TP (VC) c~=t¢———_———-o -
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note :
Clear RF signal waveform means that the shape “ ©
clearly distinguished at the center of the waveform.
”
can be
RF signal waveform
1,9,
W)
AW
OYXN)
XX)
RUM
VOLT / DIV: 200mV
TIME / DIV: 500nS
AAA)
WANN level: 1.3 + 0.3Vp-
viii .
XXX)
MWA
V
E-F Balance Check
oscilloscope
(DC range)
BD board
a
TP (TEO) eR (cae +
TP (VC) bo
Procedure :
1. Ground main board IC101 pin 66 with the lead wire.
Connect oscilloscope to test point TP (TEO) on BD board.
Turmed Power switch on.
Put disc (YEDS-18) in and playback.
Confirm that the osilloscope waveform is symmetrical on the
top and bottom in relation to OV, and check this level.
EPs Ga

Traverse waveform
e
ah
level: 300 + 100MVp-p
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain
This gain has a margin, so even if it is slightly off. There is no
problem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location :
{BD BOARD] — Component side —
RF
oO os
RVI01
10104 IC102
RV103 O TE!
° © FEO
FEt
TEO @ o
° RV102
vc
10104

SECTION 5
EXPLANATION OF IC TERMINALS
Description
Main system clock. (83MHz)
I Reset signal input terminal
Sub system clock. (32.768kHz)
1C101 TMP87CP64F-6254
0
<
a
> > Z Z
X OUT
AC. CUT
X OUT
GND
I BACK-UP mode input terminal
Not used. (GND)
Not used. (GND)
Not used. (GND)
Q
N
BACK UP
COUNT SW
INIT SW
DISC SENS
o)
2 MID SENS Not used. (GND)
3 CD XRST CD Reset output. “LT RESET
POWER Power on output. “L” : ON
5 MUTE Mute output. “L”: MUTE
6 MPX
17 | KEYCONLATCH | —_ | Notused. (OPEN)
Ce occa [oa RR
pe PON [=| Notwed OPEN)
[a0 [PON [= [ Not sed, OPEN)
FUNC C | — | Notused. (OPEN)
| 24 | ~ GEQ.LATCH | O | Latch output to gray control. (M62423FP)
24
25
35
36
37
SQ-RDS-CLK
SQ-RDS-DI
RDS-RESET
Sub-code Q data scanning clock output to DSP (CXD2507AQ), RDS clock output.
Sub-code Q data input from DSP (CXD2507AQ), RDS data input.
DS Reset signal output.
]
[2s [rps NT __[_T_[ RDSDATASTARTSignal input. ~~~
| 28 | ~=CDPOWER | O | Power on output. “Hs ON
[a [coe aren [— [Norusea OPEN) SCS
| 30 | ~~ DBEB.—__—'|_ © _| DBFBSelect output. “H?: DBFBLOW “L” : DBFB HIGH
[ai [oreo [TNR MUTEOURR—SSCSCSCSC—“‘“SSCS~*S
2 a: ee es Chip enable output to tuner PLL IC (LC72130)
FM/AM Stereo identification. “L” : STEREO
FM/AM Tuning identification. | “L” : TUNING
| SQRDS-CLK_ | _O |
| SQRps-pir | Tt
|
Ww oo
Cc a
System clock output.
D.IN
D. OUT
TABLE SENS
REQ GM
Serial data input from tuner.
Serial data (COMN) output.
Not used. (OPEN)
Data transmission request input from system control.
i
OQ
4
aay
mH
Keo]
2

1/0 Description
43
4
REQ MG
CLK MG
D. GM
D. MG
RDY
VAREF
VASS
Ss
Data transmission request output to system control.
Clock output for communications with system control.
_—
bom
ent tee ae | pemet | ee peed feet fo}
Z
Ba nN
Serial data input form system control.
> ON
ion pn N O28 me &
erial data output to system control.
bh
System control Ready signal input/output. “L” : READY
S
8 Power supply. (+5V)
ND
ND
Power supply (+5V)
Not used. (+5V)
Not used. (OPEN)
Not used. (GND Connected)
ot used. (“H” LEVEL)
ot used. (“H” LEVEL)
Not used. (“H” LEVEL)
PECIFICATION Select input. (A/D Converter)
Model Select input. (A/D Converter)
Not used. (“H” LEVEL)
Not used. (“H” LEVEL)
Deck-B PLAY Switch input. “H” : PLAY
eck-B Reel table signal input.
wa a Ney g s)
Q1Q
nN
zZ
53
URGENT. SIG
URGENT. STBY
BUG Y/N
ADJUSTOR
ADJUST2
MAGIC SPEED
SPEC
DIST
SPEED
BREAK
B-PLAY
B-SHUT
B-HALF
A-SHUT
A-PLAY
A-HALF
CAPM H/L
CAPM ON/OFF
TRIG H/L
B TRG
A TRG
RELAY
A
NORM/HIGH
BIAS ON/OFF
RM ON/OFF
REC/PB
Nn
Z, 5
6
|
wn
Z,
oo
—~N
Nn ‘Oo
ON ON
N
Oa aw
Deck-B Record prevention claw A, B detection input.
ON
Deck-A Reel table signal input.
Deck-A PLAY Switch input. ores PLAY
Deck-A HALF SW input.
Capstan motor speed selector. “H”: Normal speed “L”: High speed
Capstan motor ON/OFF. “L”:ON
—
~“
70
Trigger motor control output.
“I
ontrol output to REC/PB select switch. (IC602)
olby IC PB input Deck A/B select output. “L”: A, “HH”: B
EQ Select switch output for normal/high speed. “H” : High speed
BIAS Oscillation ON/OFF control. “H” : ON
EC Mute output. “L” :MUTE
OLBY IC REC/PLAY Select output. "EL PREC
OLBY ON/OFF Control output. “H”:ON
LINE Mute output. “LL? MUTE
ASS Amplifier switch output to DOLBY IC. (1C401)
ot used. (OPEN)
ot used. (OPEN)
ot used. (OPEN)
ot used. (OPEN)
ot used. (OPEN)
oading motor (M903) Load out output.
7
-
“i NPN an
WEN P
CT
5
76
7 “NI
Ww
co
a)
Oo
Zz oO
[es
o
ie.)
PASS
CDG. MUTE
UP MOTOR
DOWN MOTOR
TABLE R
TABLE L
LOAD OUT
LOAD IN
DF-LATCH
82
83
84
Zz
oO
—
7
a)
o.<)
oading motor (M903) Load in output.
Latch output to digital filter. (PCM1701U)

FOCUS SW
anne: seh Se
[rocussw [0
[nice Dues | —_|
esc ee ee
Ee
a
OPEN SW
1C110 M34225M1-294FP
s_ | sauscr—_— J
ele ee
el So
ca ae RS eae)
(ec eee eee Ew
ee
Tar |_urcenties [oO]
Serial data latch output to DSP. (CDX2507AQ)
High-region gain down output to focus servo. (CXA1782BQ)
Not used. (“H” LEVEL)
Not used. (GND)
GND
ower supply.
Not used. (OPEN)
ot used. (OPEN)
TEST LED Output.
WARNING LED Output. “L”:ON
| 12. | STANDBYLED | O | STANDBY LED Output. “L”
a 0
Pa etd OREN) SSS
[is [STANDBY OK [0 _| STANDBY OK Signalinpst——SCSCSCSC~SC~C“‘“‘“‘“‘“‘“‘“‘“<“<CSCStS
i ee ae Not used. (Connected to GND)
0
:
i
96
[=
[Netsed
(GND)
CSCS
[=]
Noted.
(GND)
[os
|
cuosesw
|
—
[Noted
GND)
SSS
<=
ea
ez
Power supply. (+5V)
ed
RESET Reset signal input terminal.
fea
ee eae
Not used. (Connected to GND)
Jot used. (Connected to GND)
a eae © |
URGENT Signal output.
Not used. (OPEN)
a)
Not used. (OPEN)
] EWS ON/OFF Key input.
po Not used. (Connected to GND)
Not used. (Connected to +5V)
System clock. (4MHz)
;
Not used. (Connected to GND)
Power supply. (+5V)

1C501 CXP82612-006Q
ENCIA
SIRCS
REQ. MG Data transmission request input from master control.
o" [ Daa tssmision request ouput fomastr sone,
o [LED DRIVEOu CSCS
=P Nerwed OPEN
RY | ¥0
TSK
INT
ook
output
Tor
communications
with
masiercontol,
SSS
as
gp
OUT
[0
Serial
data
ouputto
master
eoniol
———SSSSCSCSCSCSCS
ia tes [0 2
iss ,
a |
rc
ey ww)
Lb
REC, PAUSE LED Output
LED7 ROCK, USER FILE LED Output
LED8 JAZZ, POPS LED Output
CLASSIC, DANCE LED Output
mp o|]n~
os
Eos
no
[O[TUNERLED Ou CSCS
(OCB, TIMERLED Gupae———SSSCSCSC~—“‘“‘“‘“‘“‘;7<CS;CSCSS”
poe
19
©
nN
N WN
bd ON
_— ay —
“A m < W
Ww
~< 2
NPT NEN oO] OI N
nN Ww
an wm iS)
WwW ww
N ro)
w
n
4
w | we BRIO
<
”n n
W
ANI
N
N
AN4
ANS
AN6
AN7
w
“A >
Ww ON
> Ww
is)
W oo
Oo \o
40
X OUT ew
ee
2 Ou
Or
coe
ex
20
om
oa