Thomson RP7954A SERVICE MANUAL

RP7954A
FEB/99

Audio/Communication
Basic Service Data

Latin America After Sales

Indianapolis IN 46290 U.S.A.

SERVICE DATA INDEX

Exploded View ................................................................................................................ 1-6

Replacement Parts .......................................................................................................... 1-3

Safety Precautions .......................................................................................................... 1-2

Schematic ........................................................................................................................ 1-7

RP7954A

Page

Number

CAUTION: Modification or repair of this unit by unauthorized persons is a direct violation of FCC Rules Part 68.216 and could

result in risk of electric shock. You are urged to contact a qualified factory authorized service facility for repairs.

SAFETY NOTICE

USE ISOLATION TRANSFORMER WHEN SERVICING

Components having special safety characteristics are identified by a ( ) on schematics and on the parts list in this Service Data and its bulletins.
Before servicing this instrument, it is important that the service technician read and follow the "Safety Precautions" in the Basic Service Data.

First Edition - First Printing
Copyright 1999 - Thomson Consumer Electronics, Inc.
Printed in U.S.A. - Trademark(s)

®

Registered - Marca(s) Registrada(s)

RP7954A

SAFETY PRECA UTIONS

1. Before returning the instrument to the customer, always make a

safety check of the entire instrument, including, but not limited to, the
following items:

a. Be sure that no built-in protective devices are defective and/or

have been defeated during servicing. (1) Protective shields are
provided on this instrument to protect both the technician and the
customer. Correctly replace all missing protective shields, including
any removed for servicing convenience. (2) When reassembling
the instrument, 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

instrument or permit it to be operated without all protective
devices correctly installed and functioning. Servicers who
defeat safety features or fail to perform safety checks may be
liable for any resulting damage, and may expose themselves
and others to possible injury.

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,
(1) excessively wide cabinet ventilation slots, and (2) improperly
fitted and/or incorrectly secured cabinet covers.

c. Leakage Cold Check - With the instrument AC plug removed

from any AC source, connect an electrical jumper across the two
AC plug prongs. Place the instrument AC switch in the on
position. Connect one lead of an ohmmeter to the AC plug prongs
tied together and touch the other ohmmeter lead in turn to each
push button/customer control, exposed metal screws, metallized
overlays and to each cable connector. If the measured resistance
is less than 1.0 megohm or greater than 5.2 megohm an abnormality
exists that must be corrected before the instrument is returned to
the customer. Repeat this test with the AC switch in the off
position.

C101.1 Leakage Current for Appliances and Underwriters
Laboratories (UL) 1492 (Section 67). Measure for current from a
known earth ground (metal waterpipe, conduit, etc.) to all exposed
metal or conductive parts of the instrument (antenna connections,
handle bracket, metal cabinet, screwheads, metallic overlays,
push-buttons, control shafts, etc.), especially any exposed metal
parts that offer an electrical return path to the chassis. Any current
measured must not exceed 0.5 milliamp. Reverse the instrument
power cord plug in the outlet and repeat the test.

ANY MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK
HAZARD THAT MUST BE ELIMINATED BEFORE
RETURNING THE INSTRUMENT TO THE CUSTOMER
OR BEFORE CONNECTING TO ANTENNA OR
ACCESSORIES.

e. Interconnected Equipment AC Leakage Test

Avoid shock hazards. The instrument, accessory, or cable(s) to
which this instrument is connected should have the applicable
sections of the leakage resistance cold check and the leakage
current hot check performed. Do not connect this instrument to an
antenna, cable or accessory that exhibits excessive leakage currents.

2. Read and comply with all caution and safety-related notes on or inside
the instrument cabinet, and on the chassis.

3. Design Alteration Warning - Do not alter or add to the mechanical or
electrical design of this instrument. Design alterations and additions,
including, but not limited to, circuit modifications and the addition of
items such as auxiliary audio output connections, cables and accessories,
etc., might alter the safety characteristics of this instrument and create
a hazard to the user. Any design alterations or additions will void the
manufacturer's warranty and will make you, the servicer responsible
for personal injury or property damage resulting therefrom.

d. Leakage Current Hot Check

On completely assembled instrument, 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 metering system
that complies with American National Standards Institute (ANSI)

4. Observe original lead dress. Take extra care to assure correct lead dress
in the following areas: (a) near sharp edges, (b) near thermally hot parts

- be sure that leads and components do not touch thermally hot parts,
and (c) the AC supply. Always inspect in all areas for pinched, out-of­place, or frayed wiring. Do not change spacing between components
and the printed-circuit board. Check AC power cord for damage.

5. Components, parts and/or wiring that appear to have overheated or are
otherwise damaged should be replaced with components, parts or
wiring that meet original specifications. Additionally, determine the
cause of overheating and/or damage and, if necessary, take corrective
action to remove any potential safety hazard.

6. PRODUCT SAFETY NOTICE - Many electrical and mechanical
parts have special safety-related characteristics, some of which are
often not evident from visual inspection, nor can the protection they
give be obtained by replacing them with components rated for higher
voltage, wattage, etc. Parts that have special safety characteristics are
identified in this service data by a (|) on schematics and in the parts list.
Use of a substitute replacement that does not have the same safety
characteristics as the recommended replacement part in this service
data parts list might create shock, fire and/or other hazards. Product
Safety is under review continuously and new instructions are issued
whenever appropriate. For the latest information, always consult the
appropriate current service literature.

1-2

RP7954A EXPLODED VIEW

RP7954A EXPLODED VIEW

Page 1-6

REPLACEMENT PARTS

1 - 3

February

1999

PartsList

1 - 3

BEFORE REPLACING PARTS, READ THE FOLLOWING:
Approved Substitute Stock Numbers - Before ordering stock

numbers in the part list, look for an approved substitute stock
number in the current Price Schedule. This will minimize your
service time and avoid ordering parts you already have in stock.

PRODUCT SAFETY NOTE: Components marked with a critical
safety symbol have special characteristics important to safety.
Before replacing any of these components, carefully read the
PRODUCT SAFETY NOTICE in the basic service data. Do not
degrade the safety of the set through improper servicing. Although
assemblies as a whole may not be marked with a critical safety
symbol , replacement of assemblies with other assemblies not
approved may result in a safety hazard.

Critical Safety Symbol
Not Eligible For Warranty

@NOTE: When ordering components that are listed more than once in this part list, always adhere to the serial number application guidelines
given in the description column. If a serial number application guideline is not given, always select the component with a value, rating, other
specification or identification marking(s) that match those of the corresponding component in the instrument you are servicing.

StockSymbol DescriptionDrawing Symbol StockDescription Drawing

Warranty Status of Assemblies and Parts - All assemblies and
components shown in this part list are eligible for warranty exchange
or replacement except those with a dot shown to the left of the
Description. Assemblies and components with a dot to the left of the
Description are NOT eligible for warranty exchange or replacement.

Warranty replacement of cabinet parts requires the approval of a
Thomson Consumer Electronics Field Service Manager.

Warranty Status and Specifications of assemblies and components
are subject to change without notice. Consult the TCE Parts Pricing
Microfiche for the latest warranty status information.

RP-7954A
CABINET & CHASSIS

1 6A29092 LENS CASS DOOR A43-07954-01
2 6A29093 LENS CASS DOOR B43-07954-02
3 9A29094 COVER CASS DOOR A66-07954-00
4 9A29095 COVER CASS DOOR B66-07954-01
5 6A29096 LENS DISPLAY43-07954-00A
6 2A29097 HOLDER GEAR CASS DOOR63-10001-01
7 2A29098 GEAR DAMPER CASS DOOR63-10001-02
8 98A29099 CABINET FRONT60-07954-00A
9 43A29100 KNOB REPEAT53-07954-03
10 43A29101 KNOB POWER53-07954-00
102 73A29131 MECHANISM CD TCM122.598-07936-01
106 62A29132 MECHANISM CASS CS-21SW-

11 43A29102 KNOB CD FUN53-07954-06
112 2A29133 PLATE LOGO40-13008-01
12 43A29103 KNOB STOP53-07954-04
13 43A29104 KNOB SUPER BASS53-07954-05
15 43A29105 KNOB VOL51-07954-00
16 43A29106 KNOB TUNING51-07954-01
19 43A29107 KNOB BAND 253-07954-02
20 43A29108 KNOB BAND 153-07954-01
23 2A29109 GEAR A47-00937-03
27 43A29110 BUTTON STOP/EJECT B53-07954-14
28 43A29111 BUTTON PLAY B53-07954-13
29 43A29112 BUTTON PAUSE A53-07954-07
30 43A29113 BUTTON STOP/EJECT A53-07954-08
31 43A29114 BUTTON FFWD A53-07954-09
32 43A29115 BUTTON REW A53-07954-10

94-21628-00

628

33 43A29116 BUTTON PLAY A53-07954-11
34 43A29117 BUTTON REC A53-07954-12
36 2A26916 DISC55-07953-01
37 2A26914 HOLDER DISC48-00920-00
38 43A29118 KNOB CD DOOR OPEN53-07954-15
39 6A29119 LENS CD DOOR43-07953-09
40 9A29120 DOOR CD66-07953-06
42 2A26795 HOLDER DAMPER GEAR63-00206-00
43 1A26921 PIN CD DOOR EJECT55-07953-00
44 2A26794 GEAR DAMPER63-00206-01
48 8A25151 SOCKET AC POWER12-00004-09
49 78A29121 HANDLE57-07953-06
50 98A29122 CABINET REAR61-07953-20
51 9A29123 DOOR BATTERY SMALL58-07953-07
52 9A29124 DOOR BATTERY58-07953-06
53 3A26958 SPRING -74-01000-01A
54 2A26959 CONTACT PLATE [phone]
55 3A26960 SPRING +/-74-01000-00A
58 82A26956 ANTENNA WHIP23-00910-00
60 66A31143 CORD POWER30-00029-02L
61 88A29125 TRANSFORMER POWER15-06610-00
62 45A29126 FOOT RUBBER81-07953-02
75 3A29127 SPRING CASS DOOR36-07954-00
77 1A26807 GROMMET RUBBER BLK81-07635-08
82 2A29128 MAGNET97-00255-02L
84 2A26918 PLATE CLAMPER39-07953-03
85 3A29129 SPRING CD KNOB EJECT36-07953-01A
87 3A29130 SPRING CD BUTTON EJECT36-03310-02
89 3A26814 SPRING CD DOOR36-07930-01
99 1A26806 RUBBER CD81-07635-07

1 - 4

REPLACEMENT PARTS

February

1999

1 - 4

StockSymbol DescriptionDrawing Symbol StockDescription Drawing

(Continued)

ELECTRICAL COMPONENTS

CF1 36A15191 FILTER09-50107-20
D1 16A29139 DIODE LED LT0311G-4102-30041-02G
D10 198589 DIODE 1N414802-04148-00R
D11 198589 DIODE 1N414802-04148-00R
D12 198589 DIODE 1N414802-04148-00R
D13 198589 DIODE 1N414802-04148-00R
D14 198589 DIODE 1N414802-04148-00R
D15 198589 DIODE 1N414802-04148-00R
D16 198589 DIODE 1N414802-04148-00R
D17 198589 DIODE 1N414802-04148-00R
D18 198589 DIODE 1N414802-04148-00R
D19 198589 DIODE 1N414802-04148-00R
D2 198589 DIODE 1N414802-04148-00R
D20 198589 DIODE 1N414802-04148-00R
D21 198589 DIODE 1N414802-04148-00R
D23 198589 DIODE 1N414802-04148-00R
D24 198589 DIODE 1N414802-04148-00R
D25 198589 DIODE 1N414802-04148-00R
D26 198589 DIODE 1N414802-04148-00R
D29 198589 DIODE 1N414802-04148-00R
D3 198589 DIODE 1N414802-04148-00R
D30 198589 DIODE 1N414802-04148-00R
D308 16A29139 DIODE LED02-30041-02G
D31 198589 DIODE 1N414802-04148-00R
D32 198589 DIODE 1N414802-04148-00R
D34 198589 DIODE 1N414802-04148-00R
D35 198589 DIODE 1N414802-04148-00R
D36 198589 DIODE 1N414802-04148-00R
D37 198589 DIODE 1N414802-04148-00R
D38 198589 DIODE 1N414802-04148-00R
D4 EA16X1078 DIODE ZENER 9.1V 1/2W02-50091-00
D5 EA16X1078 DIODE ZENER 9.1V 1/2W02-50091-00
D501 198597 DIODE02-04001-00
D502 198597 DIODE02-04001-00
D503 198597 DIODE02-04001-00
D504 198597 DIODE02-04001-00
D6 198589 DIODE 1N414802-04148-00R
D7 198589 DIODE 1N414802-04148-00R
D8 198589 DIODE 1N414802-04148-00R
D9 16A11218 DIODE02-01043-00
FIL 36A25176 FILTER CERAMIC CCFA-45509-00455-01T
FIL 36A27314 FILTER FM09-80001-00T
IC1 33A23328 IC TA8227P03-08227-00
IC3 33A14317 IC TA8189A03-08189-00
IC4 33A29140 IC LA182803-01828-00
JAC 41A26978 JACK PHONES12-21235-15
LAB 4A31110 LABEL POPPOPRP7954
LCD301 63A29145 DISPLAY LCD91-07954-00
Q10 15A29137 TRANSISTOR 9014C01-09014-03A
Q101 15A26816 TRANSISTOR 9013G01-09013-07
Q102 15A26816 TRANSISTOR 9013G01-09013-07

Q103 15A20006 TRANSISTOR 2SC3330U01-03330-21
Q105 15A29137 TRANSISTOR 9014C01-09014-03A
Q106 15A29137 TRANSISTOR 9014C01-09014-03A
Q107 15A29137 TRANSISTOR 9014C01-09014-03A
Q108 15A29137 TRANSISTOR 9014C01-09014-03A
Q11 15A29137 TRANSISTOR 9014C01-09014-03A
Q12 15A29137 TRANSISTOR 9014C01-09014-03A
Q13 15A15170 TRANSISTOR01-09015-03
Q163 15A26973 TRANSISTOR 8050D01-08050-04S
Q17 15A20006 TRANSISTOR 2SC3330U01-03330-21
Q18 15A29134 TRANSISTOR 2SA1317S01-01317-01
Q19 15A20006 TRANSISTOR 2SC3330U01-03330-21
Q20 15A20006 TRANSISTOR 2SC3330U01-03330-21
Q201 15A26816 TRANSISTOR 9013G01-09013-07
Q202 15A26816 TRANSISTOR 9013G01-09013-07
Q203 15A20006 TRANSISTOR 2SC3330U01-03330-21
Q204 15A29137 TRANSISTOR 9014C01-09014-03A
Q205 15A29137 TRANSISTOR 9014C01-09014-03A
Q206 15A29137 TRANSISTOR 9014C01-09014-03A
Q207 15A29137 TRANSISTOR 9014C01-09014-03A
Q208 15A29137 TRANSISTOR 9014C01-09014-03A
Q21 15A29137 TRANSISTOR 9014C01-09014-03A
Q25 15A29137 TRANSISTOR 9014C01-09014-03A
Q26 15A29136 TRANSISTOR 8550D01-08550-04S
Q7 15A29135 TRANSISTOR 2SC1383R01-01383-18
Q8 15A26815 TRANSISTOR 2SD201201-02012-00
Q9 15A29137 TRANSISTOR 9014C01-09014-03A
SOC 8A25151 SOCKET AC POWER12-00004-09
SW1 39A29144 SWITCH SLIDE16-10403-42
SW2 39A29143 SWITCH SLIDE16-10402-31
SW301 39A26820 SWITCH TACT16-10102-03S
SW302 39A26820 SWITCH TACT16-10102-03S
SW303 39A26820 SWITCH TACT16-10102-03S
SW304 39A26820 SWITCH TACT16-10102-03S
SW305 39A26820 SWITCH TACT16-10102-03S
SW306 39A26820 SWITCH TACT16-10102-03S
SW307 39A26820 SWITCH TACT16-10102-03S
SW308 39A26820 SWITCH TACT16-10102-03S
SW309 39A26820 SWITCH TACT16-10102-03S
SW310 39A26820 SWITCH TACT16-10102-03S
SW311 39A26820 SWITCH TACT16-10102-03S
SW312 39A26820 SWITCH TACT16-10102-03S
SW313 39A26820 SWITCH TACT16-10102-03S
SW314 39A26820 SWITCH TACT16-10102-03S
SW315 39A26820 SWITCH TACT16-10102-03S
SW316 39A26820 SWITCH TACT16-10102-03S
SW317 39A26820 SWITCH TACT16-10102-03S
SW318 39A26820 SWITCH TACT16-10102-03S
SW319 39A26820 SWITCH TACT16-10102-03S
SW320 39A26820 SWITCH TACT16-10102-03S
SW321 39A26820 SWITCH TACT16-10102-03S
SW322 39A26820 SWITCH TACT16-10102-03S
SW323 39A26820 SWITCH TACT16-10102-03S

1 - 5

REPLACEMENT PARTS

February

1999

1 - 5

StockSymbol DescriptionDrawing Symbol StockDescription Drawing

SW324 39A26820 SWITCH TACT16-10102-03S
SW325 39A26820 SWITCH TACT16-10102-03S
SW326 39A26820 SWITCH TACT16-10102-03S
SW327 39A26820 SWITCH TACT16-10102-03S
SW328 39A26820 SWITCH TACT16-10102-03S
SW329 39A26820 SWITCH TACT16-10102-03S
SW330 39A26820 SWITCH TACT16-10102-03S
SWI 39A29141 SWITCH LEAF CD DOOR16-10101-26
SWI 39A29142 SWITCH PUSH POWER16-10202-47T
TER 38A26977 TERMINAL SPEAKER12-00006-00
TRA 88A29125 TRANSFORMER POWER15-06610-00
USE UCRP7954 USE & CARE GUIDEUCRP7954

(Continued)

RP7954A MAIN SCHEMATIC

RP7954A MAIN SCHEMATIC

Pa ge 1-7