Harman kardon cd 91 c service manual

Page 2

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CONTENTS

LEAKAGETEST ............. ...........2
COMPONENTS AND THEIR FUNCTIONS . . . . . . 2, 3
SPECIFICATIONS ..... . . . . .............. 4
INTERNAL VIEW . . . ................... . 4
DISASSEMBLY PROCEDURES ...... . . . . . . . 5-7
AC LINE CORD REPLACEMENT . ............ 7
ALIGNMENT PROCEDURES ............. 8-10
TIMINGCHART 11,12
BLOCK DIAGRAM ..................... 13

CIRCUIT DESCRIPTION ................. 14
GENERAL UNIT EXPLODED VIEW ......... . 15
GENERALUNITPARTSLIST.......,...... 16
CASSETTE MECHANISM EXPLODED VIEW . . . . 17
CASSETTE MECHANISM PARTS LIST ........ 18
ELECTRICAL PARTS LIST .......... . . . 19'21

PACKAGE
SCHEMATIC DIAGRAM . .

WIRING DIAGRAM ..................... 24

LEAKAGE TEST (FOR SERVICE ENGINEERS IN THE U.S.A.)

Before returning the unit to the user, perform the following safety checks:

1. Inspect all lead dress to make cer<
tain that leads are not pinched or
that hardware is not lodged be-
tween the chassis and other metal
parts in the unit.

2. Replace all protective devices such
as nonmetallic control knobs, in-
sulating fishpapers, cabinet backs,
adjustment and compartment cov-
ers or shields, isolation resistor-
capacity networks, mechanical in»
sulators, etc.

3. Be sure that no shock hazard exists; check for leakage
current using Simpson Model 229 Leakage Tester,
standard equipment item No. 21641, RCA Model
WT540A or use alternate method as follows:

Plug the AC line cord directly into a 120-volt AC
receptacle (do not use an lsolation Transformer for
this test). Using two clip leads, connect a 1500 ohm,
10-watt resistor paralleled by a 0.15mf capacitor, in
series with all exposed metal cabinet parts and a
known earth ground, such as a water pipe or conduit.
Use a VTVM or VOM with 1000 ohms per volt, or
higher, sensitivity to measure the AC voltage drop
across the resistor. (See Diagram.) Move the resistor
connection to each exposed metal part having a
return path to the chassis (antenna, metal, cabinet,
screw heads, knobs and control shafts, escutcheon,
etc.) and measure the AC voltage drop across the
resistor, (This test should beperformed with the
power switch in both the On and Off positions.)

A reading of 0.35 volt RMS or more is excessive and
indicates a potential shock hazard which must be
corrected before returning the unit to the owner.

COMPONENTS AND THEIR FUNCTIONS

mm mm mutt WNW,

:1:

TO EACH EXPOSED
METAL SURFACE OF
UNlT UNDER TEST

SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST

TO AC GROUND SUCH
AS WATER OR GAS PIPE,

GROUND
LEAD

HIGH
VOLTAGE
OR + LEAD

é

VTVM
70Ac SCALE 0-

1.5KOHM
10W

W),

_II_

0.15 MF

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO KNOWN
EARTH GROUND

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BX CABLE, CONDUIT, ETC,