Philips 70DCC600 User manual

~@NOO
~@NOO
Service
Digital Compact Cassette Recorder 70DCC600
1008/058/068
CCC
COMPACT CASSETTE
TABLE OF CONTENTS
Technical specification 2
W~~ ~
Dismantling instruction Iservice hints 3-12
Blockdiagram 13-14
Description of signal names 15-24
Service test program 25-26
Start-up procedure 27
Adjustment table 28
Service Iadjustment remarks 29
Service tools 29
Handling chip components 30
Wiring diagram 31-32
Main
board
Component layout 33-34
Circuit diagram 35-37
Digital
board
Circuit diagram 38-40
Electrical measurements .41-42
Component layout .43-44
Front board
Component layout .45-46
Circuit diagram .47-48
Supply board
Circuit diagram .49
Component layout .49
ReadlWrite
board
Circuit diagram 50-52
Component layout 53-54
Loading assy
Exploded view 55-56
Mechanical partslist 57
Tray indication board
Circuit diagram 57
Component layout 57
Partslist. 57
Tape
deck
Dismantling DCC-head 58
Exploded view 59-60
Partslist. 60
Wiring diagram 61-62
RED1-deck electronic 63
DCC-indication board 64
Exploded view of set 65-66
\,1echanical partslist 67
:::Iectrical partslist 68-79
Published by Consumer Electronics Printed in The Netherlands ©Copyright reserved Subject to modification 4822 725
24031
PHILIPS
PCS 60 385

TECHNICAL SPECIFICATIONS
GENERAL:
Power supply
Power consumption
Dimensions
(w x h x d)
Weight
DIGITAL 1/0:
Format
Sampling frequency
Unbalanced chinch
115 I230V +15% switchable
30W max.
5W max. in stand by
:360 x102 x300mm
:2,5kg
:AES/EBU according IEC958
:32kHz 144,1 kHz 148kHz
+0,1 %
:75Q
ANALOG OUT
ACC
Output voltage
Amplitude linearity
Phase non-linearity
Channel unbalance
Output resistance
Channel separation
Muting (search)
SNR
:0,84Vrms ±2dB (200nWb/m)
:40Hz .. 14kHz within 5dB
250Hz
.. 1 OkHz within 3dB
:
2° max. at 1 kHz
:<3dB
:200Q
:26dB at 1kHz
46dB at 20Hz
.. 20kHz
:100dB
ANALOG
IN (digital recording from analog input)
Sampling frequency : 44,1 kHz
Input sensitivity .150mV
Max. input voltage 2Vrms +2dB
Input impedance 50kQ
Dolby-mode
Fe (type I) Cr (type II)
Dolby off 47dB 50dB
Dolby B 56dB 59dB
Dolby C 64dB 67dB
ANALOG OUT DCC PLA YBACK (DAC performance)
THO
:<3%
HEADPHONE OUTPUT DCC PLAYBACK
Output voltage
Frequency range
Amplitude linearity
Phase non-linearity
Channel unbalance
Output resistance
Outband attenuation
Channel separation
Muting (search) .
SNR
THO +noise
:2Vrms +2dB
(OdB digital level)
:20Hz
.. 14,5kHz at fs =32kHz
20Hz
.. 20kHz at fs = 44,1 kHz
20Hz
.. 22kHz at fs =48kHz
:+0,5dB
:2°
max. at 1 kHz
<0,5dB at 1kHz
:200Q
:60dB above 30kHz
:80dB
at 1kHz
70dB
at 20Hz .. 20kHz
100dB
90dB I93dBA
typo
85dB at 1kHz
82dB
at 20Hz .. 20kHz
Output voltage
Channel unbalance
Output impedance
Load impedance
Output power
Channel separation
Muting (search)
SNR
THO +noise
:5Vrms max.
:<4dB
:140Q
:
32 I120 I600Q
:
27 I44 I27mW
:75dB
typo at 1kHz
:100dB
:88dB
:82dB
at 1kHzI·3dB
ANALOG OUT
DCC RECORD &PLAYBACK
(ADC &
DAC performance)
Output voltage
Frequency range
Amplitude linearity
Phase non-linearity
Channel unbalance
Output resistance
Outband attenuation
Channel separation
Muting (search)
SNR
THO +noise
PCS 60 386
:2Vrms +2dB
:20Hz
.. 14,5kHz at fs =32kHz
20Hz
.. 20kHz at fs = 44,1 kHz
20Hz
.. 22kHz at fs =48kHz
:+0,5dB
:2° max.
at 1 kHz
:<2dB
:200Q
:60dB above 30kHz
:80dB
at 1 kHz
70dB at 20Hz .. 20kHz
:100dB
:85dB I88dBA
:82dB
at 1kHz
80dB
at 20Hz .. 20kHz
2

CONTROLS AND CONNECTIONS
2345 6 7 8
19 18
AB
17 16 15
14 13 12
c
11 10 9
o
"", 1-1\1>1;\
000
'org
CONTROLS CONNECTIONS
Indication Indication Indication Indication Indication Indication
on Recorder
in Diagram
on Recorder in Diagram on Recorder in Diagram
1. Cassette Holder
10. LEVEL 3365 A. ANALOG IN
1301
2. Display 1400 11. PHONES 1311
ANALOG OUT
1306
3. MARK WRITE 1413 12. BALANCE 3311 B. DIGITAL
IN
1315
MARK ERASE 1417 13.
REC.PAUSE 1403 DIGITAL OUT 1315
RENUMBER 1412 APPEND 1406
C.
VOLTAGE SELECTOR
1203
DIG.lANALOG 1409 REC/MUTE 1407
D. MAINS 1202
4. RECORDING LEVEL 3312 14. TEXT 1410
5. PREVIOUS 1415 TIME 1418
6. STOP 1404
COUNTER RESET 1411
7. PLAY 1402 15. DOLBY B/C NR 1405
8. NEXT
1414
16. REPEAT 1420
9. BACKWARD 1421 17. OPEN/CLOSE 1401
SIDE A-B 1419
18. IR SENSOR 7410
FORWARD 1416 19. POWER ON/OFF
1204
3pes
60 387

WARNINGS
®WARNING
All les and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing. make sure that you are
connected
with the same potential as the mass
of the set via awrist wrap with resistance.
Keep components and tools also at this
potential.
CD ATTENTION
Taus les IC
et beaucoup d'autres
semi-conducteurs sont sensibles aux
dacharges statiques (ESD).
Leur longevite pourrait etre considerablement
ecourtee par
Ie fait qu'aucune precaution n'est
prise aleur manipulation.
Lors de reparations. g'assurer de bien atre falie
au meme potential que la masse de I'appareil at
anfiler
Ie bracelet sarti d'une resistance de
securite.
Veiller a co que les composants ainsi que les
cUlils que I'on utilise soient egalement ace
potentiel.
ESD
®WARNUNG
Aile ICs und viele andere Halbleiter sind
emplindlich gegen elektrostatische Entladungen
(ESD).
Unsorgtiiltige Behandlung bei der Reparatur
kann die Lebensdauer drastisch vermindern.
Sorgen sie datur, dass Sie im Reparaturfall
l.iber ein Pulsarmband mit Widerstand mit dem
Massepotential des Gerates verbunden
sind.
halten Sie Bauteile und Hillsminel ebenlalls auf
diesem Potential.
@WAARSCHUWING
Aile IC's en vele andere haltgeleiders zijn
gevoelig voor electrostatische ontladingen
(ESD).
Onzorgvuldig behandelen tijdens reparatie kan
de levensduur drastisch doen verminderen.
Zorg erYoor dat utijdens reparatie
via een
polsband met weerstand verbonden bent met
hetzeltde potentiaal als de massa van het
apparaal.
Houd componenten en hulpmiddelen oak op
ditzeltde potentiaal.
CJ) AVVERTIMENTO
Tutti Ie eparecchi semi-conduttori sono
sensibili aile scariche statiche (ESD).
La loro longevita potrebbe essere fortemente
ridatta
in caso di non osservazione della piu
grande cauzione alia loro manipolazione.
Durante
Ie riparazioni occorre quindi essere
collegato alia stesso potenziale che quello della
massa dell'apparecchio tramite un braceialetta
aresistenza.
Assicurarsi
che icomponenti eanche gli utensili
con quali si lavara siano anche aquesta
potenziale.
@
Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified be
used.
®
Veiligheidsbepalingen vereisen, dat het apparaat in zijn oorspronkelijke
toestand wordt teruggebracht en dat onderdelen, identiek aan de
gespeciliceerde worden toegepasl.
@Varo!
Avattaessa ja suojalukitus ohitettaessa olet alttiina nakymattomalle
lasersiiteilylle. Alii katso sateeseen.
CD
Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu
beachten. Der Originalzustand des Gerats dart nicht verandert werden
fUr Reparaturen sind Original-Ersatzteile zu verwenden.
CD
Le norme di sicurezza esigona che I'apparecchio venga rimesso nelle
condizioni originali e
che siano utilizzati pezzi di rtcambiago identici a
quelli specificati.
®Varning!
Osynlig laserstnllning niir denna del iir oppnad och sparren iir urkopplad.
Betrakta ej stnllen.
CD
Les normes de securite exigent que I'appareil soit remis a"etat d'arigine
et que soient utili sees les pieces de rechange identiques acelles
specifiees.
-Pour votre securite, ces documents doivent etre utilises par des
specialistes agrees, seuls habilites areparer votre appareil
en panne-.
4
pes 60 388

DISMANTLING INSTRUCTIONS
DEMOUNTING COVER
B
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HAS.109Q
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5
pes 60 389

DEMOUNTING TRAYFRONT
FRONT
C. If the tray does not move properly
you can use ascrew driver
K-M
'PULL" ON BOTH SIDES
pes 60 390
6
J"PULL"
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C"TURN GEARWHEEL
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DEMOUNTING DIGITAL BOARD
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HAS.I09?
8
pes 60 391

DEMOUNTING POWER SUPPLY
MAIN PANEL
TAPE DECK
HAS.I093
11111111111111111111111111111111111111111
888
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910
pes 60 392

OPENING AND CLOSING SERVICE COVER
G
A"CUT OUT AND REMOVE SERVICE LOCK"
A
"CUT OUT AND REMOVE SERVICE LOCK"
)
A"CUT OUT AND REMOVE SERVICE LOCK"
c
B"TURNAROUND 180 DEGREES"
"TURNAROUND 180 DEGREES"
HAS 1094
11
12
pes 60 393

BLOCKDIAGRAM
w
a.
~
ATA1
SOl)
)
WS), SBDA (DAAB), SBEF (EFAB)
C
D
A, LT ADAS, LT DAI, LT DEQ, LT DDSP
DATAC,LTSBC
Alog n.
REC in
relay
7-
p-p-[> SADC
AK5339
+6dB
+16dB
REC.BALANCE REC. LEVEL
TDRAM
256'5
256ls
IlS adaPtor~
MN41464
fDl fDl
r'-'
Gf
10
WRITE AMP. 1
dJF
SBF TDA1316T
Digital in
SAA2001 h•1
DAI left eADAS e
'--
SBC •ERCO DDSP •[>
Digital out M51581P IlL SBF rSAA2011 SAA2021 SAA2031
;::;::
SAA2041 !
Gl LTC·BUS
NII1
SAA2001 IAUXcurr.
Ir LOOP
~nht
FILTER
0I
shift
1
tt
Ir
25615
READ AMP. 1
vco
TDA1317 i
l-
lfJ LT·BUS LT·BUS
DEQ2 0
<J
!
LSAA2051
~
1
1
~
I Reference IH Analog
1
vol1aoes
feedback
DC
<J
f---
DOLBY NR
f---
Analog PB
1HEA
2sts
CXA1331
equalization
~.-
+1dB
~ Analog out -
+~B
DAC dolbyBloll
o~
'i'
A.
SAA7321
dolby c 0
Speed servo
SPEED
I--
search 0
loop filter
Silence
detection
r'-'-'-'-
'-'-'-'-'-'-'-'-'
G I'S-interlace: SCL, SWS, SDATA (AD
Headphone out
I•
"S-interlace: SCL, SWS, SDA
~~RI
S}
Capstan motor
I J:.
1602 1604
e "S-interlace: SCL, SWS, FDA
I--
. CaPSta~ ( r--
1605
1
"---<> L I
A.
driver
i motor yB
u::IIIIIillIIl e
"S-interlace: SCL, SWS, FDAC (FDA
-= l-l I0
"S-interlace: SBCL (CLAB), SBWS (
MUTE
1•
DATAO .. 7 (EDO .. 7), FLAGt, FLAG2
L--
1•
ADRSO .. 7, RASN, WRN, RDATAO, RD
Quick reverse If-
•WDATA, WCLOCK
Peak Tape end 1706 1707 1708
10
TCHO .. 7 (CHO .. 7), TAUX (AU X)
detection detection sensor
[illJIJ
0WCLOCK, WDATA
IR-EYE
fDl
1~
"S-interlace: SCL, SWS, SDA
•I Gl CLOCK, DATA, RTS
ADC (6bit) 1
lfJ
LT CNTO, LT CNT1, LT CLK, LT OAT
I
Gl LT CNTOC, LT CNTt C, LT CLKC, LT
L.
1---------
F1 IAC)- DISPLAY & f---
FRONT-IJP I Gl
MAIN-IJP
Wind motor
1
Wj~¢
1
;,~- ""'- ..... ~
TMP87CK70F 80C528
driver
;
motor _rReel 1Reel 1
~
sensor1 sensor2
loJ
I1
KEYBOARD 1
8M Hz
i
!
;0 .
Tray motor Tray 1436 1437
Easy-link in
driver
Imotor _[Iill Tape
tran~p. !
and loadingJ
Easy-link out
L.
'-'-'-'-'-'-'-'-'-'
VB
VA
lAC)
(ACj
0JiJIJ
ZSJ
ZS ZS ZS ZS
I
11
EJI
ZS ,:r
0
~
>-
Mains
I--
Voltage
I--
Mains
·12A
ZS
ZS
filter selector
transformer
~
+f IT
zsO
ZS
MA~
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POWER SUPPLY F1 F2 30V +~P sv 7V +7V·
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CS 45 914 13 14

Description of signal names
Signal name Signal flow Function
128Fs SBC
--> n.C. clock
256Fs SBC
..... DAI system clock
SBC
--> SBF
SBC
--> ADC
SBC
--> DAC
SBC
--> ADAS
Explanation
Clock output from SBC, 128 xsampling frequency.
Master clock signal (256 xsampling frequency) for SBF,
DAI, ADC, DAC and ADAS.
Is generated by SBC with
exception of the mode Digital Record.
In that case the DAI
is the MASTER and supplies 256Fs on MSTCK pin. See
also MSTCK.
Fs=32 kHz for DAB, DSR or
BS (digital audio broadcast).
Fs = 44.1 kHz for CD and DCC.
Fs=48 kHz for professional recording and OAT.
ADRSO
ADRS1
ADRS2
ADRS3
ADRS4
ADRS5
ADRS6
ADRS7
ADSDI
ADSEL
ANA L
ANA R
ASL
An
AnDAC
AUX
AUXENV
AZCHK
BIASA
BIASD
CAP A
CAP B
CAPSTAN
CASN
CHO
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CHROME
DDSP
--> DRAM
ADC
--> DAI
DAI
--> gnd
read amp
--> analog Pb
equalization
DAI --> +5V
SBC
--> DAC
SBC
--> DAC
DEQ
--> DDSP
DEQ
--> Main IlP
DDSP
--> test pin
DEQ
--> high
DEQ
--> low
Capstan motor
--> speed
control
Main IlP
--> 7359
DDSP
--> DRAM
DEQ
--> DDSP
RE Deck electronic -->
Analog Pb equalization
address lines
analog/digital serial
data input
control line
signal line
control line
attenuation
attenuate DAC
auxiliary channel
output
auxiliary envelope
azimuth check
control line
control line
control line
control line
control line
channel n
control line
15
8address lines
to DRAM to locate an address for writing
data into or reading data from memory.
DAI input for serial data from AD convertor (see also S-
DATA).
Serial data output source selection
Analog signal left (right) channel playback analog compact
cassette.
Audio sample length selection
Data input for DAC to set his attenuation register.
Control line (output from SBG) connected to DAC
attenuation input.
Sliced output from DEQ of auxiliary channel data (bit rate
12 kb/s) routed to DDSP input TAUX.
_Digital representation of the AUX signal and monitors
during DCC search mode the start of atrack.
Monitors the azimuth of channels 0and 7(output of
DDSP).
Bias current for internal AID converter of DEQ2
Bias current for internal AID converter of DEQ2
Via connection points Aand Bof capstan motor the
reference of the integrated speed control is controlled by
the additional external speed control.
Low output level switches the capstan motor on.
Column address strobe for DRAM
DEQ channel noutput
to DDSP inputs TCHO ..TCH7.
Indication if achrome analog cassette
is inserted. Chrome
Cassette is high level.
CS45915

Signal name Signal flow Function Explanation
Signal name Signal flow Function Explanation
EFAB ERCO --> SBC Error flag 1
2Serror flag directly connected
to SBC input SBEF to give
CKACO DAI
--> n.C.
Testpin Frequency accuracy check output.
(1 =frequency deviation the error status of bytes being transferred during data
>0,14% =error condition) playback (see also SBEF).
F24 DDSP <- SBC 24.576 MHz master Master clock from SBC
to DDSP and DEQ to determine
CLAB ERCO HSBC 1
2Sbit clock Bit clock I/O from ERCO directly connected to SBC I/O DEQ <- SBC clock the length of tape frame and inter frame gap.
In case of a
SBCL pin (see also SBCL). digital recording this clock
is not synchron with the
sampling frequency and its related frequencies, coming
CLOCK Main
~P --> Front ~P
clock Clock frequency for data transfer. from the
DAI (see also CLK24).
CLK22 SBC
--> n.C.
22.5792 MHz clock FAST Main
~P --> wind motor control line High output level switches +12V supply
to the motor bridge
output driver
in order to obtain high speed.
CLK24 SBC
--> DDSP 24.576 MHz master Master clock from SBC to DDSP, ADAS and DEQ to FDA SBF HADAS filtered data Bidirectional serial data line between SBF and ADAS
SBC --> DEQ clock determine the length of tape frame and inter frame gap.
In
SBC HADAS respectively SBC and ADAS.
SBC --> ADAS case of adigital recording this clock
is not synchronous
with the sampling frequency and its related frequencies, Data transfer
in 1
2Sformat, carrying
32 sub-band channels
coming from the DAI (see also F24). digital audio data (see also FDAF and FDAC). Each SWS
period 2x18 bits data are transferred.
DAAB ERCO HSBC serial data
(1
2
S)
Bidirectional 1
2Sserial data line between ERCO and SBC
(see also SBDA). FDAC ADAS HSBC filtered data Filtered data transfer between ADAS and SBC (see also
FDA).
DATA Front
~P HMain ~P
data line Communication line Front
~P -Main ~P.
FDAF ADAS HSBF filtered data Filtered data transfer between ADAS and SBF (see also
DATAO
ERCO HDDSP data line nParallel data lines for symbol transfer between ERCO and FDA).
DATA1DDSP. DDSP
is the master.
DATA2 See also
EDO .. ED7. FDIR SBC
--> SBF direction control Control line output from SBC to SBF and ADAS to indicate
DATA3 SBC
--> ADAS the mode of operation. FDIR=1; decoding mode (sub-band
DATA4 synthesis)
DATA5
FDIR=O; encoding mode (sub-band analysis).
DATA6
DATA7
FLAG1 ERCO HDDSP data bus flag Data lines for symbol transfers between ERCO and DDSP.
FLAG2 DDSP acts as the master (see also ED8 and ED9).
DCC RESET Main
~P --> ADAS control line Reset output for Main
~P for digital board. FLAGI
DAI --> gnd error flag Error flag input
Main
~P --> DAI FLAGO
DAI --> n.c. error flag Error flag output
Main
~ P --> DDSP FRESET SBC
--> SBF filter reset Reset output from SBC to cause ageneral reset for SBF
DEEMDAC SBC HDAC deemphasize DAC Control line for DAC SBC
--> ADAS and ADAS.
DEn
sensor tape counter -->
Indication of reel Signals enable the
~P:
FSYNC SBC --> SBF filter synchro- At filter sync, with arepetition rate of Fs/32, the transfer of
DET2 Main and Front
~P
movement
to detect if both reels move -tape end indication SBC
--> ADAS nization the 2x32 sub-band samples is started. Fsync ensures each
source for tape counter SBF
is synchronized with the SBC to permit only transfer
to calculate speed while WIND and REWIND of sub-band 0data during FSYNC.
position of tape HRESET mute circuit
--> Front ~P
control line Switches Front
~P on/off. Via mute circuit there is detected
DIGEYE DEQ
--> test pin digital eye output Serial data output signal
to obtain digital eye pattern to test if the set
is switched on or off. Via the HRESET line the
equalization performance of the channels. See also VAL. front
~P gets this info
DIG OFF MUTE circuit
--> DAI control line Mutes the
DAI during switch on/off the set additional to the ICLAMP write amp
--> 1706 clamp circuit output During the periods, when the head elements are not
analog outputs. selected, the write current
is directed through the external
resistor connected to ICLAMP.
DMUTE Main
~P --> read amp control line Mutes the digital part of the read amplifier when playing
analog cassettes. IFL DDSP
--> ERCO imposed flag During the ERCO encoding mode the IFL line from DDSP
is used to force the symbol currently transferred to the
EASY LINK Easy link bus Easy link bus enables to control the set via another set ERCO to become aparity symbol during ERCO encoding.
EL
in
Easy link (e.g. amplifier).
EL out interface HFront
~P
Easy link command to/from internal ~P to ex1ernal set. liS DAI
--> +5V control line 1
2SBus format selection
(1 =1
2SBus,
O=non 1
2SBus
format)
EL switch easy link indication
-->
control line Indication for Front
~P if set is equipped with Easy link
Front
~P
input. IMSTART DAI
--> Main ~P
information Control line from
DAI to main ~P to indicate the start of a
message start message transfer.
EDO
DDSP HERCO Erco data line Bidirectional parallel databus between DDSP and ERCO.
ED1
See also DATAO ... DATA7.
ED2
ED3
ED4
ED5
ED6
ED7
CS 45 916 16 17
CS 45 917

Signal name Signal flow Function Explanation Signal name Signal flow Function Explanation
INO
Head ~ read amp data lines Head signals of main data channels 0-7 LT-Bus
).lP~DAI
LT-interface is used for the system control of the digital
IN1
).lP ~ ADAS panel. The LT-interface consists of clock-, data-, control-
IN2
).lP ~ DEQ and enable lines.
IN3
).lP ~ DDSP
IN4
IN5 LTC-Bus ADAS
~ SBC LTC-interface
is mainly used for transfer of allocation
IN6 LTCLKC information from ADAS to SBC. (Encoding mode) The
IN7
LTCNTOC LTC-interface consists of
c1ock-, data-, control- and enable
LTCNT1C lines.
INAUX Head
~ read amp data line Head signal of auxiliary data. LTDATAC
LTSBC
INHERCO DDSP
~ ERCO inhibit ERCO Control line output of DDSP to inhibit the ERCO for LTCLK
).lP~DAI
LT-c1ock Bit clock line for the LT-interface. Main microprocessor
settings transfer. These settings determine whether the
).lP ~ ADAS supplies the bit clock and acts as master whilst the other
ERCO should encode or decode (see also SETINH).
).lP ~ DEQ devices perform as slaves.
).lP ~ DDSP
INL Head
~ read amp analog data line Analog input signals from DCC head LTCLKC LTC-clock Bit clock line for the LTC-interface. Main microprocessor
INMFL read amp
~
feedback line Magnetic feedback amplifier input left supplies the bit clock and acts as master whilst the other
devices perform as slaves.
INMFR read amp
~
feedback line Magnetic feedback amplifier input right LTCNTO
).lP~ DAI LT control lines Control lines of the LT-interface output from main
LTCNT1
).lP ~ ADAS microprocessor. LTCNTn determine the type of transfer to
INR Head
~ read amp analog data line Analog input signals from DCC head
).lP ~ DEQ occur across the LTDATA serial data line tolfrom micropro-
).lP ~ DDSP cessor.
INTL DAC
~ L-ch integrator left Analog output of the DAC
(ou1puts from the left positive LTDATA
).lP~DAI LT data Bidirectional serial data line of the LT-interface fromlto
and negative switched-capacitor integrator) to the left
).lP ~ADAS
microprocessor. Direction of data transfer is dependant on
channel amplifier stage.
).lP ~ DEQ the information on L TCNTO and LTCNT1 .
).lP ~ DDSP
INTR DAC
~ R-ch
integrator right Analog output of the DAC (outputs from the right positive
and negative switched-capacitor integrator) to the right LTEN
).lP ~ ADAS L Tenable ADAS Activates the LT-interface of the ADAS in case LTENA =1.
channel amplifier stage. LT-ADAS
IOSC1 ERCO <- SBC input oscillator Oscillator input for ERCO coming from the sub-band coder LTEN ).lP~ DAI L Tenable DAI Activates the LT-interface of the DAI in case LTEN (on
SBMCLK output. The nominal frequency is 6.144 MHz. LT-DAI DAI) =1.
See also SBMCLK. LTEN
).lP ~ DDSP L
Tenable DDSP Activates the LT-interface of the DDSP in case LTEN (on
IRQU DAI
~).lP
information request Control line to indicate the main microprocessor infor- LT-DDSP DDSP) =1.
microprocessor mation can
be read. LTENDEQ
).lP ~ DEQ L Tenable DEQ Activates the LT-interface of the DEQ in case LTENDEQ
12S-bus inter
IC sound 3-line serial bus consisting of aline for two time-multip- •LT-DEQ
=1 .
lexed audio data channels, aword select line for indication
of the channel being transmitted (left or right) and aclock MAG Main
).lP ~ solenoid control line Low output pulse switches the solenoid.
line. The lines are called SD,
WS and SCK. The device control circuit
which generates the SCK and WS is the master. See also
SCK, SWS and SDA. MCLK DDSP
~ ERCO master clock MCLK line of the DDSP provides the 6.144 MHz master
clock signal and is connected
to the MCLK input of the
L-IN Relay 1307
~ ADC signal line Analog signal input left channel for ADC from recording ERCO. This clock (128 xFs) is used for the symbols
amplifier or dolby
IC selected by relay 1307. transfer between DDSP and ERCO.
L-OUT DAC ~ line out amp signal line Analog signal output left channel of DAC. MFL1 read amp <- head feedback amplifier output left
MFL2
LABEL
DEQ~ ).lP
label Search mode label detection output of DEQ signals that a
label is found in the AUX-channel. When DCC player
is in
MFR1 read amp <- head feedback amplifier output right
search mode, the tape speed increases. LABEL infor- MFR2
mation is encoded throughout its length. To examine the
length of alabel, the tape speed must
be known. In search
MODEO DAI <- gnd mode selection Control lines from to select the operation mode of the DAI.
mode DEQ assesses the speed of labelled tapes. The
MODE1 input
DAI operates in ).lP mode when both lines are at '0' level.
microprocessor obtains this information via the LT-inter-
face. MPCL DDSP
~ ERCO clock phase The MPCL output of the DDSP provides the 3.072 MHz
reference (64 xFs) clock phase reference signal which is connected
LEVEL Main ).lP ~ silence control line Control signal
to adapt the silence detection circuit to the to the MPCL input of the ERCO.
detection tape speed. (High speed during search, Normal speed in
Rec mode.) MSBF DAI
~ +5V control line 1 = Most Significant Bit First
o=Least Significant Bit First
UR ADC <-
UR clock input Word clock input for the ADC MSTCK
DAI ..... 256Fs master clock Bidirectional master clock line. Dependant on CKSEL
LRCKPOL DAI
~ gnd control line polarity of LRCK selection settings the master clock
is at 128Fs or 256Fs. See also
CS45918
18
19
CS45919

Signal name Signal flow Function Explanation
TCH1
information of DEQ (see also AUX and CHO .. CH7).
TCH2
TCH3
TCH4
TCH5
TCH6
TCH7
TCHAUX
TX
DAI -> digital out transmit data Digital data output of DAI according IEC format.
UNLOCK
DAI -> n.c. unlock VCO UNLOCK indicates that VCO frequency is locked/unlocked
to received data.
URDA DDSP -> SSC unreliable data Only during playback URDA indicates that, regardless of
all other flag information, all main data, system information
or AUX data is unusable. URDA occurs during amode
change from data recording
to playback or if the DDSP
must re-synchronize with the tape signals.
USYNCI DAI
f- liP
sync input Indicates the start of anew data frame when in transparent
mode.
USYNCO DAI -> sync output Indicates start of anew data frame when in reception
mode.
VAL DEQ
..... test pin validation data Validation signal output for data bits. To test equalization
performance it is possible
to output the equalized
channels. The DEQ has for this purpose two digital outputs
present: DIGEYE and VAL (see also DIGEYE).
VIN DEQ
f- read amp voltage input DEQ inputs via VIN time multiplexed data from read
amplifier. See also RDMUX.
VIRGIN DEQ
..... DDSP Virgin detection Control output of DEQ to inform the microprocessor if a
blank tape is inserted. See also SEARCH.
WCLCK write amp
f- DDSP write clock Clock signal for the write amplifier as timing reference (f =
3.072MHz). See also WCLOCK.
WCLOCK DDSP
..... write amp write clock Write clock for write amplifier coming from DDSP. See also
WCLK.
WDATA DDSP
..... write amp write data Serial data signal of the 8main channels and AUX
channel, directed to the write amplifier.
WIND Main
ll-P -> wind motor control line Control signal to switch the driver bridge of the wind motor
driver to the desired function. High level
in FastForward and in
Play mode.
+WIND Wind motor driver
..... wind supply line Connection to terminal of wind motor.
-WIND motor
WRN DDSP
..... DRAM write enable Write enable of the DRAM.
WS ERCO HSSC word select 1
2S-interface word selection I/O line.
DDSP
f- SSC Is connected to SSWS pin of SSC. See also SSWS.
X221N
SSC <- crystal input 22,5792 MHz
X220UT SSC ..... crystal output
X241N
SSC f- crystal input 24,576 MHz
X240UT
SSC ..... crystal output
XTAL1 DAC <- 256Fs
XTAL2 DAC
..... n.c.
XSYS DAC
..... n.c. buffered output from crystal oscillator.
CS 45 924 24

SERVICE TEST PROGRAM -FLOW CHART
SYSTEM-CODE 23 (OCC)
KEY
COMMAND·CODE KEY
COMMAND·CODE
000 PREVIOUS 33
1
0'
RECORD MUTE
42
2
02
OPEN/CLOSE 45
303 SIDE
AlB 47
404 RECORD PAUSE 46
5
05
RESET
4'
6
06
BACKWARD 50
707 FORWARD
52
6
06
PLAY 53
•09 STOP 54
TEXT 11 AECORD
55
STAND BY
12 MARK WRITE 114
REPEAT 28
APPEND 117
NEXT
32 TIME 122
KEY KEY
NUMBER KEY KEY NUMBER
RENUMBER 01 RECORD
27
OPEN/CLOSE 03
DOLBY BlC 33
WRITE MARK os
BACKWARD
35
PREVIOUS 09 CDSYNCHAO 37
APPEND 11 REPEAT 3.
DlGITAUANALOGUE 17
SIDE AlB 41
FORWARD "RECOADIPAUSE 43
ERASE MARK 21
TEXT 65
PLAY 23 TIME
67
NEXT 25
RESET 73
(<<0 TRACK SIDE ram TOTAL REM TIME WRITE MARK ERASE cc
lUI' IWI lUll '\111 \WI lUll "ill k17' '1111 l\Ul 'WI
~it, ~, ~, ~, ~,: Ii, ~" ~, ~, 1!JSi ~,
table2
TRACK REPEAT CONT L 11111111111111111111111111111'"11111111111111111111 DOlBVmllNR
DIGITAl ANAlOGUE R 11111111111111111'111111111111111111111111'111111111 ~
-ell eo so 010 JO 25 20 15 12 9e • 2 0
table1
hg.4
3.3. Key test
To enter the key test fulfil preliminary setup and press the MARK
ERASE·button. The display shows "KEY TEST". Press keys and
check their corresponding key·numbers acc. to tablel.
To exit the key test press the STOP-button.
3.4.
IR-test (only for versions with IR-remote control)
To enter the IR-test fulfil preliminary setup and press the DOLBY
BiC-button. The display shows "IRTEST xxlyy".
"xx" indicates the system code (DCC=23)
"yy" indicates the command code
Press keys and
check their corresponding system Icommand-code
acc. to table2.
To exit the IR-test press the STOP-button.
3.2.
Display test
To enter the display test fulfil preliminary setup and press the
DIGITAUANALOGUE-button. The display shows "DISPLAY TEST".
Four display test pattern are available (see fig. 1-4). The patterns
can be scrolled forward resp. backward by pressing the
WIND-
resp. REWIND-button.
To exit the display test press the STOP-button.
SERVICE TEST PROGRAM -DESCRIPTIONS
3.1. Display software version of main-~P (not on all versions)
To display the software version of the main-~P fulfil preliminary
setup and press the TIME-button. The display shows
"MAINVERS Vxx".
"xx" indicates the software version of the
main·~P.
To exit this test press the STOP·button.
3.
Preliminary setup SERVICE MODE
-Turn POWER ON
-Follow "start-up procedure"
as described on page 27
-Remove cassette from the cassette compartment
-Hold DOLBY
B/C &REC.PAUSE depressed, then press PLAY
-
To enter servicemodel press the NEXT·button.
The display shows "SERVICE MODE". The available tests can now
be entered pressing the corresponding buttons (see also flow chart,
page 25).
To exit service mode press the STOP-button.
2.
Preliminary setup EXTENDED PLAYMODE
-Switch POWER ON
-Follow "start-up procedure" as described on page 27
-Insert aDCC
-Hold DOLBY
B/C &REC.PAUSE depressed, then press PLAY
The set is now in the extended playmode, music will be audible.
The display shows "x yy zz ffff'.
"x" indicates the selected tape channel
"yy" indicates the error rate of channel x
"zz" indicates the error rate of channel (x+1)
"ffff" counts the
number of tape blocks received without C1-error
flags. The counter will be resetted with every C1-error.
Press TIME to increase xby steps of 2.
To select the tape channel for the digital eye output of the DEQ2
press TEXT. The display shows "DIG EYE CH
x". To increase the
number of the tape channel press TIME, again.
1.
General
The test program is equipped with aservice modes, afactory mode
and an extended playback-mode.
The service mode includes tests
for display, detection
of hole switches, IR-remote control and keys.
The factory mode is aspecial test program, which is used in the
production process of the front board, but not useful for service
purposes.
In the extended playback-mode the error rates (C1 error
flags from DDSP) are shown on the display. Also the tape channel
for the digital eye output
olthe DEQ2 (pin1) can be selected.
Display-format:
"DIG EYE CH x"
"x" indicates the tape channel selected for the
digital eye output of the DEQ2 (pinl) 3}
Press "TEXT" to increase no. of tape channel
Press "TIME" to exit selection.
Display-format: "x yy zz ffff"
"x" indicates the selected tape channel
"yyn indicates the error rate of channel x
"zz" indicates the error rate of channel (x+1)
"ffff" counts the number of tape blocks
received without C 1-error flags.
Press "TIME" to increase x by steps of 2
PLAY·
MODE
Tape channel for
dlg.eye output
can be selected'}
press "TEXT"
PLAY-MODE
Error rates are
shown on display
Press keys of IR-transmitter and check
corresponding systemfcommand-codes acc. to table2.
Display-format: "IRTEST xxiyy"
"xx" indicates the system code (DCC=23
"yy" indicates the command code
Four display patterns are available
(see fig. 1·4). Patterns can be scrolled by
pressing "WIND" resp. "REWIND".
Press keys and check corresponding
key-numbers acc. to table1.
"xx" indicates the software version of the main-IJP
EXTENDED PLAYMODE
press "STOP"
FACTORY MODE
not used for service purposes
IR.TEST 2}
KEY·TEST
SOFTWARE-
VERSION
MAIN-~P ')
"xx" indicates the software version
of the front-~P
Switch POWER ON
To enter service test program hold
"DOLBY BiC" & "REC.PAUSE" depressed, then press "PLAY"
r---1 DISPLAY-TEST 1----1
DCC yes
inserted? >-'='------~------.------,
Preliminary
setup
service- or
factexy-mode
?
Display shows
"Service mode"
no
Display shows
"Servmode Vxx"
SERVICE MODE
press "NEXT" t
press "MARK ERASE"
display shows "KEY TEST"
press "DOLBY BiC"
display shows "IRTEST xxiyy"
press "DIGITAUANALOGUE"
display
shows "DISPLAY TEST"
press "TIME" t----1
display shows "MAINVERS Vxx·
press "RECORD"
display shows "HOLE TEST"
HOLE-TEST Hold indication switch xdepressed.
If detection is OK the display shows
"HOLE x OK", else "HOLE TEST"
1--
3.5. Hole test
To enter the hole test fulfil preliminary setup and press the
RECORD-button. The display shows "HOLE TEST". Hold indication
switch xdepressed and check display.
If detection is OK the display
shows "HOLE xOK", else
"HOLE TEST".
To exit the hole test press the STOP-button.
press "APPEND"
display shows "TRAY TEST"
press ''TEXT''
display shows "LT-CHECK"
press "STOP"
EXIT
SERVICE MODE
TRAY-TEST
LT-BUS
CHECK '}
Press "OPENiCLOSE"
If tray end switches are OK the display
shows "OPEN OK" resp. "CLOSE OK",
else "OPEN ERROR" resp. "CLOSE ERROR"
Communication between DEQ2, DDSP, ADASiSBC
and main·~P can be tested. To choose IC to be
checked press "WIND" resp. "REWIND".
If communication via LT-interface is correct the display
shows ego "DEQ OK", else "DEQ ERROR".
1) not on all versions
2) only for versions with IR-remote control
3) only useful with special measurement eqUipment
fig.1
II/ III II/ III I"~ ,1/ II/ I" III ,1/ III II/
/II III III /I, /I, III III III III III III III
flg.2
«<0 TRACK SIDE Elm TOTAL REM TIME WRITE MARK ERASE CC eb:::
TRACK REPEAT CONT L1111111111111111111111111111111111111111111111111111 OOLBVCHilNR
DIGITAL ANALOGUE R1111111111111111111111111111111111111111111111111111 ~
.ce eo so ~ JO 25 20 15 12 te • 2 0
hg.3
3.6. Tray test
To enter the tray test fulfil preliminary setup and press the
APPEND-button. The display shows "TRAY TEST". If tray end
switches are
OK the display shows "OPEN OK" resp. "CLOSE OK",
else "OPEN ERROR" resp. "CLOSE ERROR".
To exit the tray test press the STOP-button.
3.7. L
T-bus check (not on all versions)
To enter the LT-bus check fulfil preliminary setup and press the
TEXT-button. The display shows "LT-CHECK".
The communication between DEQ2, DDSP, ADAS/SBC and main-
~P can be tested. To choose the IC to be checked press WIND
resp. REWIND.
If the communication via LT-interface is correct the
display shows e.g. "DEQ OK", else
"DEQ ERROR".
To exit the LT-bus check press the STOP-button.
25
26
CS 45 925

STAR~UPPROCEDURE
ADJUSTMENT TABLE
Resets ADAS, SBF left, SBF right
DDSP
---> "PLAY MODE"
DAI ---> "TRANS.MODE"
SBC
---> "DECODE MODE"
DEQ2
---> "LOAD COEFF."
DEQ2
---> "TEST MODE"
+5A,+~P
*Adjustments can not be carried out in repair shops.
Read also adjustment remarks on page 29
REMARKS 0C
IAI
~
TAPE SPEED
Use test cassette
"SBC420" 0
<9
Adjust to
3150Hz 3264 f=3130
.. 3140Hz
(482239730071)
main board
TAKE UP TORQUE
Use tourque
measurem.
casso
Adjust to
"811CTM" 3220 40
.. 50g-cm
(482239530054)
main board
WOW AND FLUTTER
Use test cassette
"SBC420" 0
<9
check only <O,15%w1d.
3150Hz
(4822 397 30071 )main board
ANALOG FEEDBACK LEVEL AND BIAS
Set feedback pots
00
Adjust both channels
3729(left) and 03739 (left) to"min.
THD
Use test cassette 3730(right) to 3740 (right) (target <2%)
"SBC420" max. output level first read/write board
1kHz-10dB
00
(482239730071 )3729 (left) Decrease measured
03730 (right) output level by 10dB
read/write board
DOLBY LEVEL
Use
00
Adjust both channels
Dolby reference Dolby ref. level 03325 (left) to 620mV
±40mV
200nWb/m 3326 (right) Check: level meter
cassette main board shows -6dB
RDMUX-LEVEL *
Use 0
~
9,6kHz calibration check only 1,2Vpp
±1 OOmV
cassette read/write board
RECORDING CURRENT *
~
~
read/write board
PLL-FREQUENCY Disconnect cable
from digital-in plug,
~ ~
Use counter,
switch to 3550 adjust to 7,25MHz
RECORD PAUSE +O,15/-0MHz
(digital source) digital board
-Prerec. DCC: Atime, Rtime, TOC, TNo, TEXT
-Super user tape: Atime, Rtime", TNo"
-User tape: Rtime", TNo·
.. only if possible
Front-~P sends position of hole switches, ...
If head support switch is in "open" position
main-~P sends 22ms solenoid pulses
Command transferred
via LT-interlace
main-~P HDDSP
Chip initialization
Mode settings resp. filter coefficients
transferred via LT-interlace
300ms pulse
Resets ADAS, DAI, DDSP
If tray-switch ="open"
tray will be closed
+5V,+12V, +10, -12V, -5V (main board)
+5RW, +5VA, +5VB, +7V (RIW board)
STOP
DISPLAY DATA
front-~P
TRANSFER OF DATA
main-~P ---> front-~P
main-~P sets
DCC RESET ---> "H"
reset of
front-~P
HRESET ---> "L"
main-~P sets
I/O-ports
---> "H"
mute
---> "L"
SBC sets
FRESET
---> "H"
DDSP resets SBC
SETPIN2
---> "H"
(RESET SBC
---> "H")
STBY ---> "L"
muting of FIXOUT,
DAI
and HEADPHONE
power
on
front-~P resets main-~P
SRESET ---> "H"
read TRAY-SWITCH
read HOLE-SWITCHES
RED to STOP POSITION
CS 45 926
27
28

SERVICE REMARKS
DCC-head
The heads used in the DCC-system are called "thin film head" and made by repeating 20 times or more of multiple evaporations
and spatterings
as in fabricating ICs.
Accordingly, the heads have different features
and characteristics from those of coil winding type heads used in conventional
analog cassette tape decks:
-The playback head uses amagnetic resistive element (MRH)
-The
MRH needs magnetic bias to obtain its maximum output. So, abias conductor which is equivalent to acoil to develop the
magnetic bias is installed.
-Moreover, the analog playback head needs a magnetic feedback
to increase linearity. This is realized by giving amagnetic
field proportional
to the MR-element output from abias conductor.
For terminals
and structure of the DCC-head see page 50, circuit diagram read/write board.
Handling DCC-heads
Caution: The heads are susceptible
to electrostatic voltage higher than 150Voc. The heads are protected from external
electrostatic charging by connecting the head flexible cables
to the read/write board. When disconnecting the cables, always
place the deck
on abench with required electrostatic discharging measures taken and wear an electrostatic discharging band.
Moreover, always mount the short-clip
on the flexible cables removed.
The heads are also susceptible
to strong external magnetic field and the analog output may be affected. Do not use ahead
demagnetizer, etc.
WARNING
DO NOTUSE ADEMAGNETIZER
CASSETTE!
Adjustment remark -recording current
For each head, arecommended recording current exists individually (120 .. 180mA). If this value is not adjusted correctly, the
RDMUX value does not match between aself recorded tape and prerecorded tape. Moreover, if arecording
is made at adeep
layer with ahigh value, the previous records can not be erased when
an overwrite recording is made at that area later. As a
consequence the error rate will be increased at that area.
The
adjustment of the recording current requires an accuracy of ±O,2dB - a very close tolerance which can not be
realized
without special adjustment jigs.
Therefore: When the DCC-head
or the write-amplifier has to be replaced exchange the whole loading-assy
(4822691 20833). The
loading assy, delivered, is adjusted by the factory. Only adjustments which have to be carried
out on the main-board have to be done in the repair shop (tape speed, take-up torque, dolby level).
SERVICE TOOLS
TORX screwdriver set "SBC163"
Universal analog test cassette
Cr02 "SBC419"
Universal analog test cassette Fe "SBC420"
9,6kHz calibration cassette (prerecorded DCC)
Audio performance test cassette (prerecorded DCC)
General
purpose test cassette (prerecorded DCC)
Torque measurement cassette
"811 CTM"
Tape
guide gauge "ABEX THG-801"
Head
mounting support (see page 58)
29
482239550145
4822 397 30069
482239730071
4822 397 30264
4822 397 30255
4822 397 30256
4822 395 30054
482231050108
4822 403 70846
CS 45 927

HANDLING CHIP COMPONENTS
GENERAL DISIIDUNTING
IlDUNTING
A
EXAIIPLES
.... A PAIR IIrUI.RS
~
SWlER
eO.5-0.8mm
~IJERI~~~
SOlIJERlNG TIlL SWlER 8
<3 Slc/,id. eO.5-0.8mm
BJ ~~&U£~
c
A
SOlIJERl~
IRON
ctEAltNG
SOlDER W!(J( r~~:::=::::::l
.... WEllER r::=~~~~:::l
solder tip PT-H7
PRECAUTIONS
S£R'flCE PA(J(AGE
SOlDERING ~
~ ~~ GJ!>«!~
~ ~~ ~
~~d~j
CS 45 928 30