Alpine CHA-1214 User manual

MMMLPINE.
SERVICE MANUAL
Compact Disc Remote Changer
COMPACT
Cyd) Shuttle
DIGITAL AUDIO
@ The model described in this manual is developed from CHA-1204.
For information that is not mentioned in this service manual, refer to the Service Manual ¢
CHA-1204 (Part No. 68E24871S01).
@ For the CD deck mechanism parts (DW74A010) of this model, refer to the
Service Manual » DW Series (Part No. 68E24878S01).
@ SEF Wis, CHA-12048°N-ZEFWERDTHW ETF,
COV aPV WHEAOARRMLTEW ETOC, RRMCOWTI, F-EAVIa
FP Jb + CHA-1204 (68E24871S01) & BARRA ET.
@ KIBONCD X A=AL (DW74A01 0) (CD TOBE, t-EAVYIaPJ > DW Series
(68E24878S01) & BAAR ET.
LZ NINE:
WW REGULATED bit DAC
(HIGH SPEED DISC CHANGE
WOIGITAL SERVO/ DISC TITLE MEMORY
CD SNLAtie
COMPACT DISC CHANGER CHA-1214 UQB-NET
4-NET
P-EARAIRS| A |
Hi ai FLO.
Chi Awana

CHA-1214
Contents
Packing
Assembly
Parts
List
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o
Parts
Layout
on
P.C.
Boards
and
Wiring
Diagram
(Only
Difference)
..........c.cccccccscesscesecesesesecesesssscscsecaecaeseseesecscenens
Schematic
Diagram
(Only
Difference)
.............ccceceesessessssesessesssseensseescsussessssvsusscessssessesausasarsucaesecaesusavavacececsueseceaesess
Electrical’
Parts:
List(
Only
Diflerence)
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Cabinet
Assembly
Parts
List
(Only
Difference)
.........cccccceccescscscssssesscssscessevscsesusecscseseessavacsusecassescsestsecsuvsssecensesecse
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Specifications
Servo Monitor
Fr-REDA-(CDWT
Refer
to
the
Service
Manual
-
Resetting
the
mechanism
elevator
position
CHA-1204
(Part
No.
68P24871S01).
AAIVN—-2-MEOBRE (CDT
2
Description
of
IC
Terminal
H-ERAVIAP
IL
>
CHA-1204
ca
Block
Diagram
(68E24871S01)
&
SARRAL
Ss
F,
a
Exploded
View
(Cabinet)
: Semiconductor Lead Identifications

i
|
4
Hf
i
rt No.
33K
01T00733K01
01B90279W01
68P10924Y49
68P10924Y49
68P10924Y67
| CHA-1214
No.
Sy Assy., Magazine
Ai-NET Cable
Kit Installation
Owner's Manual
Owner's Manual
(English/Francais/Espanol)
Owner's Manual
(Deutsch/Italiano/Svenska)
NOTE: ©: For North American Model Only, A: For General Foreign Model Only, Others : Common.
1A tea aoze
im aa
01T00733K01
01B90279W01
68P10924Y70
01D90176W01
, Ai-NET Cable
Kit Installation
Owner's Manual
Assy., Magazine

CHA-1214
Parts Layout on P.C. Boards and Wiring Diagram
(Only Difference)
NOTE: Refer to the Service Manual * CHA-1204 (Part No. 68E24871S01)
for description not mentioned in this manual.
K aS nN TUSuRoCOwTs, t-EAVIsaPw-:
CHA-1204 (68E24871S01) & BARBRA E TS,
All P.C. Boards viewed from soldered side.
Main P.C.Board
REO
WHT)
WHT(2)
WHT(3)
To CBS01
From Elevator PC Board
(CHS501)
SHLD (GNO)
SHLD (S.GND)
2
3
& AWHT (BUS-)
2 {Hee 84s GRY
Festa |
[ve arty) Assy, AINET Connector
Connector P.C.Board
Orange Color Pattern : Component Side P attern
Blue Color Pattern _: Foil Side Pattern
Le ens ee ee (ee

Schematic Diagram (Only Difference)
NOTE:Refer to the Service Manual -
CHA-1204(Part No.68E24871S01)
for description not mentioned
in this manual.
£113
100/10
s
w+
Main P.C.Board
*RRENTUSUBBACIUTIA, F-EAVIAPW-:
CHA-1204(68E24871SOIJZSRMUET.
RIS 47K
R131 15K
C116 8200P
mw ax C108 L552 ox
i sle ERS 0.1 so see
oa
=: ae
ze ee Ome
beta Meo
AUTOMATIC ] =" 2 %)
(28) LASER POWER] X | &
CONTROL ole 0103
2581238
(26) Ba =
= Ls 0102 SB05-05¢P
-ma2
aes
Ee oT BUFFER AMP
R201 R207 R209
6.2K
(27)
E201 R203
C201 100P
g s
in] 2
N
R130 10k s 8
(22) 3
R113 24K
(21)
R14 1.5K
(25)
R126 15K
(24)
a a ee
* Addendum Parts
* IBA
NOTE: .
1. All resistance values are in ohms. K = 1,000 1
2. All capacitance values are in microfarads. P = 7,000,000
CHA-1214

CHA-1214
Electrical Par ts List NOTE : For the parts not mentioned, refer to the Service
Manual for CHA1204 (Part No. 68E24871S01).
| Model | CHA-1204 CHA-1214
No.
Main P.C.Board
IC's
1C501
\c502
51T85151W15
51T85304W01
85151W15
X24C16S8!
Capacitors
E106 23774437
C143 —
C144 =|08S82122F61
1pF / 35V
CP., 1000pF
Resistors
067T15444W15
06T15444W03
360K ohm 1/10W
110K ohm 1/10W
Connector P.C.Board
Capacitor
as ;
Resistor
R544 =[06S70072F45 CP., 470 ohm 1/4W
Miscellaneous
M104 ]01V83900W16
Assy., Spindle Motor (2V-90mA) 01V13300Y54 Spindle Motor (2V-90mA)

AR Aab an tae
Ic502 |51T85304W01 4X24C16S8l
1pF / 35V
1000pF
Resistors
06T15444W15 CP., 360K 92 1/10W
06T15444W03 =JCP., 110K 2 1/10W
IADR — RIB
Capacitor
K MSH TUG RICOUTI,. t-EAVIAPIL:
CHA1204 (68E24871S01) <Bh@RRUET,
330K Q 1/10W
120K Q 1/10W
ii 23861523F25 ELY., 0.1pF / SOV 23T25191W24 |CP
Resistor
06S70072F45 ={CP.,, 4702 1/4W | C.F., 4709
% MHD BAB an
M104 |01V83900W16 [Assy., Spindle Motor
(2V-90mA)
1,390J01V13300Y54 |Assy., Spindle Motor
(2V-90mA)
CHA-1214

CHA-1214
- Cabinet Assembly Parts List
NOTE : For the parts not mentioned, refer to the Service
Manual for CHA1204 (Part No. 68E24871S01).
CHA-1204 CHA-1214
| Model |
i a
No.
5-C [13C90259W02
Assy., Front Escutcheon Assy., Front Escutcheon
Cover, Corner L Cover, Corner L
Cover, Corner R Cover, Corner R
Screw, Pan Nylok (M2X5) Screw, Pan Nylok (M2X4.5)
1-D }15B90266W02
2-G |15B90267W02
3 5- 1
5 1-D ]15B90266W01
6 2-G |15B90267W01
10 03S94385F23
tre Ry bP abanthie
BcM AN TUAVBBeaICOUY Clg, H-EAVIAPN:
CHA1204 (68E24871S01) BARRA ET,
[Model ] CHA-1204 CHA-1214
ae, /.o)
ws [5] sane | az |omels| moss | was [sme
cS | al] Bass Absa % EMME] 5! | aan es abaaS ENS
3 5-C ]13C90259W01 |{Assy., Front Escutcheon 5-C 113C90259W02 |Assy., Front Escutcheon 2,200
5 1-D |15B90266W01 1-D |15B90266W02
6 2-G 115B90267W01 2-G |15B90267W02
10
Cover, Corner L Cover, Corner L 330}
Cover, Corner R Cover, Corner R 330}
Screw, Pan Nylok (M2X5) Screw, Pan Nylok
(M2X4.5)

MMMLPINE.
SERVICE
MANUAL
Compact Disc Remote Changer
COMPACT
Cyd Shuttie
DIGITAL AUDIO
@ For the CD deck mechanism parts (DW74A010) of this model, refer to the
| Service Manual - DW Series (Part No. 68E24878S01).
@
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X
AHAAL
(DW74A01
O/T
DU
TOBH
ME,
H-EAVIAPVIL:
DWY
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(68E24878S01)
&
SRRRRUYE
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MLZ Nek INE
COMPACT DISC CHANGER CHA-1204 GGf-NET
Va-NET
P-EZRAES| OA |
tt fi ALN .| MC-53-0 |
ChAwieoa

CHA-1204
Contents
Packing ASSOMmbly Parts List socccccccicctentask. icccsencasaesvatensenonctycadenea onsrenns shaadosienp ietuna iy tans oeacweraguvanodhneeentenyacatinatiaddehoays 3
Packing Method View ..........::cccccccssesssesescssessesseeescssseessesesssesecsesesecsesecseseesssenseeeseaeesesesesiseesesiseesasessecisieeeesnenstenassaees 3
SPAN CTE INS a es oo chines Gest e paaiace testa ined et vSdas see ied mbt ect eaeementeedoones eed gota cay eategs Oubathenpe NRO seau Aenea Satie 4
Servo Monitor s-siet ieieteidiie eee tbs ede eas. ntti Shab eetee tht SRR Aa cetera aol ang oa ae 5 to 10
SF ee Fe GC ora ate eat ia cata tncgatae A ccaaaaanepetcana shes cdc cua bb eae clas en enue ee 11~16
Resetting the mechanism Glovator POSHION .......ss.sccinisscscscsdsosniyoaaaéasssuausensosscyssepsonssenyospneyavetoreeyensdtokoneredersibnttessaten 17
Fd EN ele Smeg (7A) RED Eo age ee TPR Ee EE EY STE nT nee nee eee ee 17
Description of IC Terminal .............-:-ccsssessescescsseseseesesssssesesecscsesesecsssecenseseeneessesessssesnsesserstaseesaseecesisereeseeaenens 18 to 19
Block: Diagram svtvicscienitnink fan idk eiail bude ial Gatien eh Ea GnRH aad tage 20
Parts Layout on P.C. Boards and Wiring Diagram ...........ceccseceeeeereeeeeeeeseeeieneneneneeeeeeeeneneneneraeeneieeneatenes 21 to 22
Schematic Diagram ........ccccecceccseecescesesssssscereseesssesseseneesesseesseneeseseessessecseeessenessesseeseeeseessenesneceeeaeareestemeeaeees 23 to 25
ElectricaliParts List..cs'ccccletszecerssetens cde att sas eth dikes a caatieadl ctaadeate a sched deg apres aay betede nea aaeeeeae pees aeade 26 to 29
Cabinet
Assembly
Parts
List
...........::sccsscscsssssssessssessesssesssssesssevssscescensoesseensseesenessenensesssenessenessasscensesanensensnsaesiy
sees
30
Exploded View (Cabinet) ...........ccccecceseecsssessesesecsesesesenscscseseseeeseneeeeeecaseecesiesensenenecasesesieessaenessenanenesnensategs 31 to 32
Semiconductor Lead Identifications ..........cccceceeceeseececeeeeeesesceeeneeseceeesceetessetecsersesssseceesersssesseesesaessenessseaeeeesies eas 33

CHA-1204
Packing Assembly Parts List
No. No. :
101 ., Ai-NET Cable
Ai-NET Cable
Side
Bracket, Mounting Base
Hex. Flange (M6X50)
03B40155F 10
03863857F05
03D40121T11
02B47353F06
68P90579W60
Bolt, Hex. (M6X25)
‘|Screw, Tapping (M5X15)
Bolt, Hex. W/Double Washer (M4X8)
Nut, Hex. Flange (M6)
Owner's Manual
68P90579W60 [Owner's Manual
(English/Francais/Espanol)
Owner's Manual
(Deutsch/Italiano/Svenska)
Owner's Manual
68P90579W61
68P81384W81
NOTE: ©: For North American Model Only, A: For General Foreign Model Only,
L]: For Japanese Model Only, Others : Common.
Packing Method View

CHA-1204
Specifications
<CD SECTION >
SYStGIT> es SocsccactesVcwethl ba cetoeia dea eceed cas Based tee Senet ea tae zeace se tecs Lesgube sesh cpigtecnvnadacedstutnasie Optical (Compact Disc System)
Quantizing Bit NUMber oo... ee cece ceeeeseeeseeenecseecaenseseuseaneassesesssesseuseususeeeeassnesseeseesareraseeseeas 16 bit Linear System
CHGIAONS > © 2555 casksidscd secebsct lessee ala ueseeccuacesacesavi desea oettdeaessuocesuatanssinecess¥ehvoduadescenssooeseeurevsadoeseondied 2 Channels, Stereo
Ghaninel Balane:, - a.cisefleesssseccescecesecvasescnntdkdveetcscnteces cozassesencesesaccccossesensvangcuncauceuneensnevesceupaesataisaneedeneayenseiasuaeaueds 0+3dB
Distortion: (Q9ZZ); dscibsei ewes eecite wctvavsesieviea coevese bse ehcencipuie lo ceteeseveragee couscedieagensdevieusnedeeatesconea deapesenloconsadttesebestats 0.02%
Frequency Response (Ref. 1KHZ) oes cece eeeceeceesesesseccesseecessesseseeeseeseeeseusesssnenseeuenenenea O0+2dB (17HZ~19.997kHz)
SIN RAO: .5.pccessevsdevedsacevass stbeccvaceeysdoeslictl deed sieavecd sveceadunesusveredeesauviucauchvssvavhecsuied cutaavtigesiecstpagiduevievesesncdunreensers eee 90dB
Channel:Separation: ~cccvcis ricceccasiccebis eke Ge cncik pen tackceets raidead cantencccnsdees ch csekesdeesadiegéad oadsSuba cerdecebeohasvensote 75dB (997Hz)
65dB (10.007kHz)
De-Emphasis: (Ret. AKAZ) — 2:.ccecc.ccdscceccedissscsecanonactetiacsediecotenshadeases javans sacacks gdutnge tacaschvedeedguleotionecicesece -20+3dB (4kHz)
-20+30B (16kHz)
Corrénts: Consumption (at:PEAY): cstiecsesisisadisessistatecrercescennevstenscectivescadeceavedenicacdcoacoonsvsiacauanedidussbededsedusassteesadunch ives 1A
<GENERAL >
POWEr:SUDPIY® cess seieestesonceceteuscesnsteh spunscdcsnesdntionyedoasaugaddust cnuaneecevastsuavaaeesecaabeasdeeaueaaseasateed 14V DC (10.5~16V allowable)
Output Voltage /IMPOdANCE. .....sccisccceecescicessteevscassavstcscevsacscvecestvosvesestavecesseescetusevsbenseesesetenseees 850 +150mV/10kohm
Semiconductors: .:..ss5.c: (escent cacedindaaes Geeasxestadsevesbebedh eanvenasrevensense cls 12IC's, 13Transistors, 8Diodes, 5Zener Diodes
Dimensions:(WXHEXD): sata nvdadiinedidiviy ad beta tees dentin eteadiiitien aheci aint aes ntesennss 262 X98 x 183mm
WIQNE: > sccscccsssssticcecetvenscesteneateaucnssnecaseccaptoyocsupccegadcestsesonsntenseeshcesseesussveegaiedsdi avseesscUvatvesecavedaaueusoreconsduteviuldearsatdeaiees 2.3kg
<COMPACT DISC >
TRACK PICK sagssvsscosteacdeves tases gueeeidecs Wlecdhci2i dy Aaeesuesvesescectaeesdgustecreececeuieesbersacesveh atbaatabuceysecesuacsisrseevsebchaaioedhpds ceautd 16yum
Modulation Frequency. c:to:.ssssieiieticcstcsteseseseedientenseesbasectslresasstonus val savctausaroeeetdv ual eee dadearbanat anvleaventesmagiaed 44.1 kHz
Transfer Rate -siscseecide ten oeaeeieeods an ciuensses edadiehecpuctesdvedh ovesadauesiisaieayes cotwetnebiy ctiara ts aneeleted 4.321 8Mbit/sec.
DIMENSIONS: sesesvekecitccecasechscedicedencecesnncecssetbevsxdsedentesascdies stedercivesstbasensseds oPantedipcashoeasbuee ensntecactipvassuuencyeancon 120 X1.2mm
NOTE : Due to Continuing product improvement, specifications and designs are subject to change without notice.

| CHA-1204
Servo Monitor (Part No. 01E20845S01)
1. Purpose
CHA-1204 performs digital signal processing in the inside of Super 1 chip LSI.
The outside alignment circuit builds into this LSI. Each alignments are automatic.
This DT Mechanism Servo Monitor is a jig for the automatic alignment circuitry.
Please refer to the following list for the reference;
1. LED indicates the alignment.
2. Diagnosis of automatic alignment.
3. LED indicates a failure item for easy failure analysis of servo circuitry.
External View
o0vl ©
LPS VALUE
* The numbers of the automatic alignment sequence.
ll. Connection Points and Connection Method
Main P.C.Board (Solder Side)
T.P.5 (A2)
T.P.3(A0)
Yellow
NOTE : For the Test Points (T.P.3~5),
refer to the Parts Layout on P.C.Boards
and Wiring Diagram.
oovl @ <
Connect each of the wires to the Test point as illustrated in the diagram.
* Be very careful not to shorts the test points since they are located close together.

CHA-1204
lil. Operating Specifications
The automatic adjustment operations of the CHA-1204 are performed by output of the commands of the
various
adjustment
items
from
the
main
microprocessor.
Adjustments
are
performed
in
response
to
these
commands
by
the
super
1-chip
LSI.
This
servo
monitor
jig
receives
the
signal
returned
to
the
main
microprocessor
from
the
super
1
chip
LS!
and
causes
the
LED
to
light
or
go
off.
The
adjustment
condition
(of
either
completed
or
not
yet
completed)
of
the
various
adjustment
items
can be
checked
using
the
lighting
condition of
this
LED.
The following test discs are required for the good/fault judgment:
1. A-BEX TCD-721 (6th track - 1.2mm) : Scratch test disc
2. A-BEX TCD-782 : Signal test disc
Measures to be Taken Corres
1,
When
a
LED
other
than
FAGC
or
TAGC
lights,
perform
the
fault
causation
analysis
using
the
fault
diagnosis
chart
according
to
the LED
indication.
;
2.
When
only
the
FAGC
or
TAGC
LED
turn
on
a
lights
(indicating
that
the
focus/tracking
fine
gain
adjustment
is
not
completed),
perform
the
focus/tracking
servo
gain
adjustment.
If
the
value
is within
the
specification,
the
adjustment
is
normal.
i) LED indications
Lit : Fault Unlit : OK
Adjustment | LED Name| Adjustment Order Contents
Order
AOC2 Tracking offset Corrects the tracking error value as an offset.
adjustment
im:
fo Ball d
| = | oer [omen pial earl ean cae
AOC1 Focus offset Corrects the focus error value as an offset.
adjustment
4 AGC1 Focus rough gain Determines the amount of extemal interference
adjustment applied at the time of the focus rough gain adjustment.
AGC2 Tracking rough gain} Determines the amount of extemal interference
adjustment applied at the time of the racking rough gain adjustment
ABC1 Focus balance Provides correction so that the focus error signal can take
adjustment balance between positive sections and negative sections.
7 ABC2 Tracking balance Corrects the average value of the tracking error as a balance
adjustment value.
FAGC Focus fine gain Introduces extemal interference and adjusts the focus gain to
adjustment an appropriate value,
TAGC Tracking fine gain | introduces extemal interference and adjusts the tracking
adjustment gain to an appropriate value.
ii) Seven-Segment LED (LPS Value)
This mechanism has 26 position of 1T to 12T, 1P to 12P, E, HP.
Those
positions
indicate
height
of
elevator
of
mechanism
in
7
segment
LED
in
hexadecimal.
IC501
reads
data
from
these
positions
and
convert
into
A/D
signal.
Hexadecimal
and
tray
location
refer
to
the
following
list.
* The 1st to 12th disc traies step each 1T to 12T to be drawn out of the magazine.
The ist to 12th discs step each 1P to 12P to disc chuck and play.
E is the position that magazine ejects.
HP is elevator stand-by position without the magazine.
NOTE 1: Display of each position 5
value of limit of HEX cod, LPS
(liner position sensor) is to rmal.
NOTE 2: Incase of LPS is normal
and disc change actuatin is
not smooth, check magairse
circumference tray chasss again.

CHA-1204
IV. Fault Diagnosis Chart
Main Flow Chart
Error monitor check
(A)
Fault item Judgment Fault item Judgment
TR balance
offset
adjustment
Offset
adjustment
|
____
41)
balance
adjustmen|
adjustment
bo...
(5)
(AOC2)
not
completed.
(ABC2)
not
completed.
FO ; F
Disc : ; fi i FO fine gain
F
Disc
detection
fine
gain
:
detection
=>—~-———*]
hotcompleted.
b-----
2
i
adjustment
=
-------
(6)
(DDT)
not
completed.
+2)
adjustment
not
completed.
FO FO offset iia, Ohh TR fine gain
offset
adjustment
adjustment
=
F--=--
<1)
adjustment
adjustment
=
}-----
+6)
(AOC1) not completed. (TAGC) not completed.
FO F
‘ FO rough gain
aeicnt
adjustment
=
p=-----
<1)
Does
not
play.
F-----
+7)
(AGC1) not completed.
TR F
i
TR
rough
gain
.
apie
adjustment
-n---
+3)
fr
Soe
Scratched
disc
(AGC2)
not
completed.
playability
play
fault
FO FO balance
balance adjustment adjustment = Fe---- -(4)
{ABC 1) not completed.
(A)
* Notes
1) When more than one LED are light, perform a circuit check according to the order of the main flow chart.
2) Proper soldering of patterns and IC pins is a precondition. Accordingly, when an IC fault is reached in the flow
chart, do not replace the part immediately; check the soldering (for loose and bridges).
3) Faults such as faulty capacitors and resistors in the flow include bad parts, different constants, looseness,
and cracks.
4) Use track 6 of A-BEX TCD-721 for the scratched disc playability check.
Judgments (1)
TR offset adjustment FO offset adjustment FO rough gain adjustment
not yet completed. not yet completed. not yet completed.
Are the
outputs from
AN8806SB (iC 102)
#27, #29, and
#30 2.5V?
MN66271 (1C101)
is faulty
AN8806SB (1C102) is
faulty or surrounding
capacitors/resistors
are faulty
* R102, 103, 104
C109, 110, 122

CHA-1204
Judgments (2)
Disc detection
not yet completed.
AN8806SB
(IC102) #27 FEOUT
Is there output of
an S-curve ?
MN66271 (10101)
is faulty
Judgments (5)
‘TR balance adjustment
hot yet completed
(16101) #31
25V?
AN8806SB (IC 102) is
faulty or surrounding
capactors/resistors
are faulty
Is there
laser current ?
APC circuit is faulty
v
Laser current = 0 (A)
*RI41
YES Note:
Do not connect or disconnect a DC
voltmeter while the set is drawing current.
Doing so may destroy the laser diode.
Is the
laser current within
+5mA of the indication
on the flexible
wiring
* Internal temperature of the set is room
YES temperature (20°C)
Does
the objective
lens of the pickup
move up and
down ?
AN8806SB (C102) is fault
or surrounding capacitors
/resistors are faulty
(R104 , C122)
Isa
triangular
wave of MN66271
MN66271 (1C101)
is faulty
triangular
waves of BA6791FP
{1C103) #26 (4.1V)
and #27 (3.8V)
utput 2
BA6791FP (IC103)
is faulty
YES
Pickup is faulty
* Focus coil is open.
MN66271 (1C101)
is faulty
*R102
cno
Judgments (3)
TR rough gain adjust-
ent not yet completed,
AN8806SB (/C102) is faulty
or capacitors/resistors
surrounding TEQUT
are faulty
*RIOS C123
MN66271 (iC101)
is faulty
Judgments (4)
FO balance adjustment
not yet completed.
Is the
Does the output of
focus
servo
INGE:
MN66271
(IC
101)
come on ? eceeT| Ue10))
#28 26V?
* Is the output of
MN66271 (IC101)
YES #11 (FLock) “L'?
Is the
output of
MN66271 (16101)
#28 2.5V7
Does
the tracking servo
come on ?
MN66271 (IC 101)
is faulty
* Is the output of
MN66271 (IC101)
YES #12 (TLock) *L"?
External capacitors of
AN8806SB (IC 102) #11
and #12 are faulty or
AN8806S8B is faulty
*CIL2, 113, 118
NO
Is the
output of
MN66271 (1C101)
#30 2.7V 2
AN8806SB (IC102) is
faulty or surrounding
capacitors/resistors
are faulty
* R103, C109
BA6791FP (ICt03)is
faulty or surrounding
capacitors/resistors
are faulty
* R116, 917, 118,131
Cii6
E131
* Focus coil is open or
tracking coil is open
Judgments (6)
FO fine gain adjustment
not yet completed.
TR fine gain adjustment
not yet completed.
Is the gain normal 7
MN66271 (IC101)
is fautty
Both focus and tracking are
within 0 + 3.dB
is the
external CR
fitter circuit
normal 7
Pickup is faulty
Extemal CR filter
és faulty
(4A,

CHA-1204
Judgments (7) Judgments (8)
Faulty play of
scratched disc
External CR fitter of
tracking servo system
is faulty
Unit does not play
External capacitor of
AN8806SB (IC 102) #13
Are the is faulty
outputs of : * R105 C123
wN6B2¥1 (10101) MN66271 (IC101) #44, prereset ag R16, 1R
eR EV? #45, #47, and #48 C16
*R109, 110, 111, 112 R131
+ #44---2.6V } CIOL, 102,130 EI3I
#45---15V TEBPF circuit between
#47--2.6V #25 and #23 of
#48---2.1V AN8806SB (IC102)
is faulty
*RI06 , 124
C107 , 108
Are the
outputs of
MN66271 (C101) #13,
MN66271 (IC101)
#14, and #15 is fauly
*#13—-0.1V
#14---4.9V
YES #15 --- 4.8V
Microprocessor (IC501)
is faulty
Drive unit or pickup
is fautty
Measurements
A. RF Signal Level Measurement
The main beam of the returning light is received by the photodiode and the output voltage is obtained by
current-voltage conversion of A+B+C+D.
1, Block Diagram
Sample player Oscilloscope
2. Measurement Method
(a). Connect the ground terminal of the oscilloscope VREF (AN8806SB (iC 102), PIN 20) and measure
the RF signal (of AN8806SB (IC 102), pin 7).
(b). Play the first track of the measurement disc A-BEX TCD-782.
(c). Read the peak-to-peak value of the waveform.
Specification: 0.5V +0.2
* When the value is outside of the specification (i.e., not good), check AN8806SB (IC 102), the pickup,
and R136/C120.
B. Jitter Measurement
The standard deviation of the pulse width when a trigger is applied to the rising edge of the 3T component of
the RF signal.
1. Block Diagram
Sample player Jitter meter
2. Measurement Method
(a). Connect the ground terminal of the jitter meter to VREF (AN8806SB (IC 102), PIN 20) and measure
the ARF signal (of AN8806SB (C102), pin 10).
(b). Play the first track of the A-BEX TCD-782 measurement disc.
(c). Read the indicated value of the jitter meter.
Specification: 25nS or less
* When the value is outside of the specification, check AN8806SB (IC 102), the pickup, and R136/C120.

CHA-1204
C. Focus Servo Gain Measurement
Measure the focus servo open loop gain in the servo-on (closed loop) condition.
1. Block Diagram
Sample player Oscillator and oscilloscope
2. Measurement Method using an Oscillator and an Oscilloscope
(a).
(b).
3. Connection (Example)
Connect OSC output to resistor for gain measurement (100 ohms).
(Connect a servo driver side to positive side.)
Connect CH1 of oscilloscope to a servo driver side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Connect CH2 of oscilloscope to MN66271 (IC 101) side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Play back the eighth track of A-BEX TCD-782 disc for
measurement. (No sound recording track)
Output frequency (1.2 kHz, 150 mVP-P) from OSC
and compare the amplitude of CH1 and CH2 of oscilloscope
and convert into dB.
NOTE: AC voltmeter is available to measurement.
OSC
Oscilloscope or
AC voltmeter
Common with the
ground of the set
BA6791FP (IC 103)
* FOD: Focus drive output
D. Tracking Servo Gain Measurement
Measure the tracking servo open loop gain in the servo-on (closed loop) condition.
1. Block Diagram
Sample player Oscillator and oscilloscope
2. Measurement Method using an Oscilloscope
(a).
(b).
(c).
(d).
e).
Connect OSC output to resistor for gain measurement (100 ohms) connection (Esme)
(Connect a servo driver side to positive side.)
Connect CH1 of oscilloscope to a servo driver side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Connect CH2 of oscilloscope to MN66271 (IC 101) side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Play back the eighth track of A-BEX TCD-782 disc for
measurement. (No sound recording track)
Output frequency (1.2 kHz, 150 mVP-P) from OSC
and compare the amplitude of CH1 and CH2 of oscilloscope
and convert into dB.
NOTE: AC voltmeter is available to measurement.
OSC
Oscilloscope or
AC voltmeter
Common wth the
ground of he set
BA6791FP (IC 103)
* TRD: Tracking drive output
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