Harman kardon hk 330 i service manual

Page 2

m

CONTENTS

LEAKAGE TEST ....................... 2 CIRCUIT DESCRIPTION ................. 11
SPECIFICATIONS ...................... 3 IC FUNCTIONAL BLOCK DIAGRAM ...... . . 11
COMPONENTS AND THEIR FUNCTIONS ...... 3, 4 GENERAL UNIT EXPLODED VIEW .......... 12
DISASSEMBLY PROCEDURES ............. 5 GENERAL UNIT PARTS LIST .............. 13
INTERNAL VIEW ...................... 6 ELECTRICAL PARTS LIST .............. 14-17
DIAL MECHANISM ..................... 6 PACKAGE ......................... 18
ALIGNMENT PROCEDURES .............. 7-9 SCHEMATIC DIAGRAM ................ 19
BLOCK DIAGRAM ..................... 10 WIRING DIAGRAM ..................... 20

LEAKAGE TEST

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,
adiustment 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, 6
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 -OAC SCALEO-
receptacle (do not use an Isolation Transformer for
this test). Using two clip leads, connect a 1500 ohm,
10-wett resistor paralleled by a 0.15mi capacitor, in MA

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 I I

higher, sensitivity to measure the AC voltage drop

SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST

TO EACH EXPOSED
METAL SURFACE OF
UNITUNDER TEST

TO AC GROUND SUCH
AS WATER 0R GAS PIPE,
BX CAELE, CONDUIT, ETCt

HIGH
VOLTAGE
OR + LEAD

VTVM

15KOHM
10W

. 0.15 MF

across the resistor. (See Diagram.) Move the resistor

connection to each exposed metal part havtng a TEST PROBE

return path to the chassrs (antenna, metal, cabinet,

screw heads, knobs and control shafts, escutcheon,

etc.) and measure the AC voltage drop across the To EXPOSED CONNECT To KNOWN
METAL PARTS EARTH GROUND

resistor. (This test should be performed 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.

hk330i