Fisher SLIM 1800 Service Manual

Page 1

93> FISHER

AUDIO/VIDEO

SERVICE MANUAL

, MODEL
SLIM-1800

CAUTION: Before servicing the chassis, read the "Important Service Safety
Information" section on page 2 of this manual.

AMIFM STEREO CD PLAYER WITH COOK TIMER

SPECIFICATIONS

RADIO AM FM
FrequenCy Range 520-1710KHZ 87.5-107 gMHz
IF 450KHZ 10,7MHZ
Antenna PIG TAIL EOOHM
Audio

Power Suppiy AC 120V, 60Hz

Speaker 4 ohm

Audio Power Output 2 x 5W 10%THD

SERVICE PUBLICATION

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8

CONTENTS
IMPORTANT SERVICE SAFETY INFORMATION- - 2
DISASSEMBLY INSTRUCTIONS ~~~~~~~~~ 3
ALIGNMENT PROCEDURES - 4
ADJUSTMENT LOCATIONS - 5
BLOCK DIAGRAM - 6
WIRING DIAGRAM - 7
IC BLOCK DIAGRAMS - 842
PRINTED CIRCUIT BOARDS - 13-18
SCHEMATIC DIAGRAMS 19-21
EXPLODED VIEW - 22
EXPLODED VIEW PARTS LIST - 23
REPLACEMENT PARTS LIST - 24~29

Page 2

IMPORTANT SERVICE SAFETY INFORMATION

1.5AFETY PRECAUTIONS
Before returning a unit to the customer. always make a safety check of the
entire unlt.including. but not limited to the following Items:

a. He sure that no built-in protective devices are defective and/or have been
defeated during servicing.

(1) Protective shields are provided to protect both the technician and
the customer. Correctly replace all missing protective shields
Including any removed for servicing convenience.

(2) When reinstalling the chassis and/or other assemblies In the cabinet.
be sure to put back in place all protective devices. including. but not
limited to. nonmetallic control knobs. Insulating fishpapers.
adjustment and compartment covers/shields and isolation resistor!
capacitor networks. Do not operate this unit or permit it to be operated
without all protective devices correctly installed and functioning.

b. Be sure that there are no cabinet openings through which an adult or
child might be able to Insert their fingers and contact a hazardous voltage.
Such openings include. but are not limited to. excessively wide cabinet
ventilation slots. and an improperly fitted and/or Incorrectly secured cabinet
back cover.

c. Leakage Current Hot Check - With the unit completely reassembled,
plug the AC line cord directly Into a 120V AC outlet. (Do not use an
isolation transformer during this test.) Use a leakage current tester or a
maering system that complies with American National Standards Institute
(ANSI) (3101.1 "Leakage Current for Appliances" and UndeMrlters
Laboratories (UL) 1410. (50.7). With the unit AC switch first In the ON
postion and then in the OFF position. measure from a known oath ground
(metal water pipe. conduit. etc.) to all exposed metal parts of the unit
(antennas. handle bracket. metal cabinet. screwheads. metallic overlays.
control shaft. etc). especially any exposed metal parts that offer an
electrical return path to the chassis. Any current measured must not
exceed 0.5 mllllamp. Reverse the unit power cord plug in the outlet and
repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HERENIN INDICATE A POTENTIAL SHOCK HAZARD
TAHT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO
THE CUSTOMER.

READING SHOULD
AC Leakage Test LOT BE ABOVE
0.5mA)
DEVI TEST ALL
UNDE: EXPOSED METAL _
TEST SURFACES LEAKAGE
CURRENT
2-WIRE CORD TESTER
ALso TEST WITH
PLUG REVERSED EARTH
3. (USING Ac ADAPTER GROUND
PLUG As REQUIRED)

d. Insulation Resistance Test Cold Check
Unplug the power supply cord and connect a jumper wire between the
two prongs of the plug.
Turn on the power switch of the unit.
Measure the resistance with an ohmmeter between the jumpered AC
plug and each exposed metallic cabinet part on the unit. such as
screwheads. antenna. control shafts. handle brackets. etc. When the
exposed metallic part has a return path to the chassis. the reading should
be between 1 and 5,2 megohms. When there is no return path to the
chassis. the reading must be "infinite". if it is not within the limits specified.
there is the possibility of a shock hazard. and the unit must be repaired
and rechecked before it is returned to the customer.

ANTENNA

TERMINAL-*3r

EXPOSED .- .

METAL /

PART . I
OHMMETER

2. PRODUCT SAFETY NOTICE

Some electrical and mechanical parts have special safety related

characteristics which are ofien not evident from visual inspection. nor can

the protection they give necessarily be obtained by replacing them with.
components rated for higher voltage. wattage, etc. Parts that have special

safety characteristics are identified by a Aon schematic and parts list,

Use of a substitute replacement that does not have the same safty

characteristics as the recommended replacement part might create shock.

fire. and/or other hazards. Product Safety is under review continuously and

new instructions are issued whenever appropriate.

3. SERVICING PRECAUTIONS

CAUTIONzBefore servicing the unit covered by this service manual and

Its supplements. read and follow the SAFETY PRECAUTIONS on this

page. NOTE: If unforeseen circumstances create a conflit between the

following servicing precautions and any of the safety precautions. always
follow the safety precautions. Remember: Safety First.

General Servicing Precautions.

a, Always unplug the unit's AC power cord from the AC power source
before:

(1) removing or reinstalling any component. circuit board. module, or any
other unit assembly.

(2) disconnecting or reconnecting any unit electrical plug or other electrical
connection.

(3) connecting a test substitute in parallel with an electrolytic capacitor in

the unit.
Caution: A wrong part substitution or incorrect polarity installation of
electrolytic capacitors may result in an explosion hazard.

b. Do not defeat any plug/socket 8+ voltage interlocks with which the unit
covered by this service manual might be equipped.

c. Do not apply AC power to this unit and/or any of its electrimi assemblies
unless all solid-state device heat sinks are correctly installed.

d. Always connect a test unit instrument's ground lead to the unit's chassis
ground before connecting the test instrument's positive lead. Always
remove the test instruments ground lead last.

4. LASER PRECAUTIONS

WARNINGII

1. When servicing, (in case it is necessary to confirm Laser Beam
Emission) be sure not to place your eyes any closer than 1 ft or 30cm
from the surface of the Objective Lens on the Opticvai Pickup Block.

HANDLING THE LASER PICKUP

2. Laser diodes are extremely susceptible to damage from static electricity.
Even If a static discharge does not ruin the diode. it can shorten its life
or cause it to work Improperly. When replacing the pickup. use a
conductive hat on the floor and desk and wear a wrist band connected
to ground through a 1M ohm resistor to protect the laser diode from
static damage. If the lens should get dusty. blow off the dust carefully
from the object.

3. There are no adjustable parts In the pickup assembly. If it is defeaive.
replace the whole pickup assembly.

CAUTION:
USE OF CONTROLS. ADJUSTMENTS OR PERFORMANCE OF
PROCEDURES HEREIN MAY RESULT IN HAZARDOUS
RADIATION EXPOSURE.

DANGER:
IF INTERLOCK FAILS OR IS DEFEATED. THE LASER LIGHT IS
ABLE TO FUNCTION. THE LASER IS INVISIBLE. AVOID DIRECT
EXPOSURE TO BEAM.