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