Akai CD 55 Service Manual

Page 2

* SAFETY-� INSTRIJCTIONS

PRECAUTIONS DL'RING SERVICING

1 Paris Identified by [he 1 H-�) symbol are critical [or
safely. Replace only will parls number speCllied.
ln addiuon re sniery. orher pans and assemblies are «per
[med rorconlormnnce Wlmsuch regulationsaslhoseap-
plying ro spurious radiaiioii,

These musl also be replaced only wirh specified replace-
menls.

Examples: RF converiers. iuner unirs. anlenna selecror
swiiches, RF cnbles. noise blocking capacnors. noise
blocking fillers. eic.

Use specified inrernal wiring. Noie especmlly:

1) Wires covered vviih PVC rubing

2) Double insulaied wires

3) High voliage leads

. Us: spemfied insulniing mnierials for hazardous live

parrs. Nore especially: -

ll lnsulanon Tape

2) PVC iubirig

3) Spacers (lnsulanng Barriers)

4) lnsulaxion sheets for transisrors

5) Plasnc screws lor lixing microswirch (especially in
lurnrable)

. When replacing AC primary side components (Hans-
loriners. power cords. noise blocking capacirors. eic.).
wrap ends of wires securely obour ilie ierniinals before
soldering.

halal?-�

Observe IhaI wires do nor comeci hear producing pnrrs
(hearsmks. oxide melal film resistorsi fusible resistors.
elc ),

u

s»

..

Vi

9-�

* INFORMATION

7 Checlr rhnr replaced wires do noi coniaci \harp edged or
polnred puns.

3 Also check areas surrounding repaired locniions

9 L-�se care lhal foreign ubyecls (screws. solder droplels.
erel d0 nol remain insldc me sel

SAFETY CHECK AFTER SERVICING

Afler servicing, inalre measuremenis of leakage-current or
resisrance in order lo derermlne lnal :(puxcd parts are ac»
cepmbly insulnled from lhe supply circuir

The leakage-current measurement should be done belween
accessible nieral parrs (such as chassis. ground ierrnirial.
mrcrophone Jacks. S|gnaI~|npuV0quuI connectors. arc)
and rhe earih ground ihrongh n resisier of 1500 ohrns paral-
leled mill .1 0.15 pF capaclmr. under Ihe unll-�s normal
working condmons The lenknge-curreni should be less
than 0.5 mA rms AC,

The resistance measuremem should be done between JC~
cessible exposed meral p {(5 and power cord plug prongs
with the power swuch (l ncluded) -�0N", Th: rcslsmnce
should be more than 2.2 Mohms.

SYMBOLS FOR PRIMARY DESTINATION

Alphabel indicates lhe desrmnuun or rhe unils as listed
beluw

Symbols Principal Desiinaiions

VOLTAGE CONVERSION (E Model only)
Beloreconnecringihepoucrcordbei :neVOLTAGESE-
LECTOR locaied on ihe renr pnnel sun a screwdriver so
than ihe correci vollagc is lndicaled.

_ USA
8 CK
C Canada

, E . Europe ieicepi us;
i _1_E9«n__.-�

Auslmlll :

T . w Germany only
-� U i L-�niversalArea
iv . Cusiuinsersion

SE!-� in; \lnL u.

PRECALTIONS I,\ REPAIRING

when repazring or Jdlusmg ihe unil. picne nnie rhe (nlr
inning pliinrs

= Do noi pui excessive pressure on ihe mecthlcuI
pnri ioperniion pan). including ihe pickrup bluzk. _is
euremely high mechiinicul precision is required in
lhese pans

When the base I) removed {or repulr or adjuslmenl.
make sure II'ILII mere are no meinl ubiecls in (he nar-
ruu in? beiween ihe PC. board or lhe mecha pans
andlhe base.

The .\I1:ro-Compuler and ihe CD signal processing
le can be damaged by siarlc elecrriciry or leakage:
fmm a soldering iron during rcpniring

Whlle ~E-�Idenng. paease lake ihe precuullum againsi
leakage is in ihe llluVKmllon

, GND

4 Do noi loosen dm-� \crevn In the pickup block

when handing lhe p|Ck'up black. please refer lo the
polnls lo NOTE when replacing ihe pick-up block
Keep solely {or hazardous Inuslbl: Laser Radiaiion.
DO NOT Mich ihe Luser Beam lObieciive lensi di-
recrlv.

Vlodcls [or (he some counmefi. laser warning labels
are filmed On (he null and :nsuI: of the unit. 1:
shounbelow

Read II carenilly lor your saieiy. when repairing Jr
adjusllnglne unit.

0

[DENMARK UK. LSA]

CLASS 1

LASER PRODUCT

A Label dl-�l'lxed an [he UI'III

-\ LJbiI .AI'I'iXEd inside of [he urlll

mu lc: \inuL