Philips FW c155 Diagram

Service Manual

Service

Service

Mini System

Service
Service

Service

FW-C155/21/34/37

TABLE OF CONTENTS

Page

Location of pc boards & Version variations................1-2

Technical Specifications .............................................1-3

Measurement setup....................................................1-4

Service Aids, Safety Instruction, etc. ..........................1-5

Disassembly Instructions & Service positions .............. 2

Service Test Programs .................................................. 3

Set Block diagram ......................................................... 4

Set Wiring diagram ........................................................ 5

Front and Combi Board .................................................6

Tape Mechanism............................................................9

3CDC-LLC-MCD1........................................................ 10

Set Mechanical Exploded view & parts list ................. 11

COMPACT

DIGITAL AUDIO

CLASS 1

©

Copyright 2001 Philips Consumer Electronics B.V. Eindhoven, The Netherlands

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise
without the prior permission of Philips.

Published by KC 0150 Service Audio Printed in The Netherlands Subject to modification

LASER PRODUCT

GB

3139 785 30027

LOCATION OF PC BOARDS

FR

O

N

B

T

O

A

R

D

1-2

CD BOARD

COMBI BOARD

VERSION VARIATIONS:

Type /Versions: FW-C155

Features &

/21 /34 /37

Board in used:
Incredible Surround

Karaoke
News
RDS
Rotary Encoder (volume control)
Jog Shuttle
Voltage Selector x
Aux Input
Digital Output
Headphone Socket x x x
Line Output
Subwoofer Output
Surround Output
Matrix Surround Loudspeakers
Standby - Clock Display x x x
Standby - Dark

SPECIFICATIONS

1-3

GENERAL:

Mains voltage : 110-127V/220-240V Switchable for /21

230V for /34

120V for /37
Mains frequency : 50/60Hz
Power consumption : < 11W at Standby

25W Active

30W Active /34
Clock accuracy : < 4 seconds per day
Dimension centre unit : 265 x 310 x 330mm

TUNER:
FM

Tuning range : 87.5-108MHz

65.81-74MHz for /34

Grid : 50kHz not for /37

30kHz not for /21/37

100kHz not for /34
IF frequency : 10.7MHz ± 20kHz
Aerial input : 75Ω coaxial

300Ω click fit for /37
Sensitivity at 26dB S/N : < 7µV
Selectivity at 600kHz bandwidth : > 25dB
Image rejection : > 25dB
Distortion at RF=1mV, dev. 75kHz : < 3%

-3dB Limiting point : < 8µV
Crosstalk at RF=1mV, dev. 40kHz : > 18dB

AMPLIFIER:

Output power

1)

: 2 x 5W ± 1dB
Frequency response within -3dB : 50Hz-15kHz
Dynamic Bass Boost : DBB ON, DBB Off
Digital Sound Control : Jazz, Techno, Optimal, Rock

2)

2)

Headphone output at 32Ω : 900mV ± 1dB (max Vol.)

CASSETTE RECORDER:

Number of track : 2 x 2 stereo
Tape speed : 4.76 cm/sec +2.5/-1.5%
Wow and flutter : < 0.35% DIN
Fast-wind/rewind time C60 : 130 sec
Bias system : 75kHz ± 5kHz
Rec/Pb frequency response within 8dB : 80Hz - 10kHz
Signal to noise ratio : > 48dBA

COMPACT DISC:

Measurement done at output conn. of the CDC module.
Frequency response within ± 1.5dB: 20Hz - 20kHz
Output level (in Vrms) :550mV, Z

= 100Ω

out

Signal/Noise ratio (A-weighted) : > 80dBA
Distortion at 1kHz : < 0.003%
Channel unbalance at 1kHz : ±1dB
Channel separation at 1kHz : > 60dB
De-emphasis : 0 or 15/50 mS (Switched by subcode

on the disc)

MW

Tuning range : 531-1602kHz not for /37

530-1700kHz not for /34

Grid : 9kHz not for /37

10kHz not for /34
IF frequency : 450kHz ± 1kHz
Aerial input : Frame aerial
Sensitivity at 26dB S/N : < 4.4mV/M
Selectivity at 18kHz bandwidth : > 18dB
IF rejection : > 45dB
Image rejection : > 28dB
Distortion at RF=50mV, m=80% : < 5%

1)

3Ω, 1 kHz, 10% THD

2)

Frequency response in each setting is software controlled.

MEASUREMENT SETUP

Tuner FM

1-4

Bandpass

LF Voltmeter

e.g. PM2534

RF Generator

e.g. PM5326

DUT

250Hz-15kHz

e.g. 7122 707 48001

Ri=50Ω

S/N and distortion meter

e.g. Sound Technology ST1700B

Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).

Tuner AM (MW,LW)

RF Generator

e.g. PM5326

Ri=50Ω

DUT

Frame aerial

e.g. 7122 707 89001

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday´s cage.
Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).

CD

Use Audio Signal Disc
(replaces test disc 3)

DUT

L

R

SBC429 4822 397 30184

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator

e.g. PM5110

DUT

L

R

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

SERVICE AIDS

1-5

Service Tools:

Universal Torx driver holder .................................. 4822 395 91019

Torx bit T10 150mm ............................................. 4822 395 50456

Torx driver set T6 - T20......................................... 4822 395 50145

Torx driver T10 extended ...................................... 4822 395 50423

Cassette:

SBC419 Test cassette CrO2................................. 4822 397 30069

SBC420 Test cassette Fe ..................................... 4822 397 30071

MTT150 Dolby level 200nWb/M............................ 4822 397 30271

Compact Disc:

SBC426/426A Test disc 5 + 5A ............................ 4822 397 30096

SBC442 Audio Burn-in Test disc 1kHz ................. 4822 397 30155

SBC429 Audio Signals disc .................................. 4822 397 30184

Dolby Pro-logic Test Disc...................................... 4822 395 10216

HANDLING CHIP COMPONENTS

ESD Equipment:
Anti-static table mat - large 1200x650x1.25mm ... 4822 466 10953

Anti-static table mat - small 600x650x1.25mm..... 4822 466 10958

Anti-static wristband .............................................. 4822 395 10223

Connector box (1MΩ)............................................ 4822 320 11307

Extension cable

(to connect wristband to conn. box).................. 4822 320 11305

Connecting cable

(to connect table mat to conn. box) .................. 4822 320 11306

Earth cable (to connect product to mat or box) .... 4822 320 11308

Complete kit ESD3

(combining all above products)......................... 4822 320 10671

Wristband tester .................................................... 4822 344 13999

WARNING

GB

All ICs and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are
connected with the same potential as the mass
of the set via a wrist wrap with resistance.
Keep components and tools also at this
potential.

F

ATTENTION

Tous les IC et beaucoup d’autres
semi-conducteurs sont sensibles aux
décharges statiques (ESD).
Leur longévité pourrait être considérablement
écourtée par le fait qu’aucune précaution n’est
prise à leur manipulation.
Lors de réparations, s’assurer de bien être relié
au même potentiel que la masse de l’appareil et
enfiler le bracelet serti d’une résistance de
sécurité.
Veiller à ce que les composants ainsi que les
outils que l’on utilise soient également à ce
potentiel.

1-6

ESD

D

WARNUNG

Alle ICs und viele andere Halbleiter sind
empfindlich gegenüber elektrostatischen
Entladungen (ESD).
Unsorgfältige Behandlung im Reparaturfall kan
die Lebensdauer drastisch reduzieren.
Veranlassen Sie, dass Sie im Reparaturfall über
ein Pulsarmband mit Widerstand verbunden
sind mit dem gleichen Potential wie die Masse
des Gerätes.
Bauteile und Hilfsmittel auch auf dieses gleiche
Potential halten.

WAARSCHUWING

NL

Alle IC’s en vele andere halfgeleiders zijn
gevoelig voor electrostatische ontladingen
(ESD).
Onzorgvuldig behandelen tijdens reparatie kan
de levensduur drastisch doen verminderen.
Zorg ervoor dat u tijdens reparatie via een
polsband met weerstand verbonden bent met
hetzelfde potentiaal als de massa van het
apparaat.
Houd componenten en hulpmiddelen ook op
ditzelfde potentiaal.

I

AVVERTIMENTO

Tutti IC e parecchi semi-conduttori sono
sensibili alle scariche statiche (ESD).
La loro longevità potrebbe essere fortemente
ridatta in caso di non osservazione della più
grande cauzione alla loro manipolazione.
Durante le riparazioni occorre quindi essere
collegato allo stesso potenziale che quello della
massa dell’apparecchio tramite un braccialetto
a resistenza.
Assicurarsi che i componenti e anche gli utensili
con quali si lavora siano anche a questo
potenziale.

GB

Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified,
be used.

NL

Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in
zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen,
identiek aan de gespecificeerde, worden toegepast.

F

Les normes de sécurité exigent que l’appareil soit remis à l’état
d’origine et que soient utiliséés les piéces de rechange identiques
à celles spécifiées.

D

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu
beachten. Der Original zustand des Geräts darf nicht verändert werden;
für Reparaturen sind Original-Ersatzteile zu verwenden.

“Pour votre sécurité, ces documents
doivent être utilisés par des spécia­listes agréés, seuls habilités à réparer
votre appareil en panne”.

CLASS 1

LASER PRODUCT

GB

Invisible laser radiation when open.
Avoid direct exposure to beam.

Osynlig laserstrålning när apparaten är öppnad och spärren
är urkopplad. Betrakta ej strålen.

Warning !

S

Varning !

3122 110 03420

I

Le norme di sicurezza esigono che l’apparecchio venga rimesso
nelle condizioni originali e che siano utilizzati i pezzi di ricambio
identici a quelli specificati.

"After servicing and before returning set to customer perform a
leakage current measurement test from all exposed metal parts to
earth ground to assure no shock hazard exist. The leakage current
must not exceed 0.5mA."

Varoitus !

SF

Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina
näkymättömälle laserisäteilylle. Älä katso säteeseen!

DK Advarse !

Usynlig laserstråling ved åbning når sikkerhedsafbrydere er
ude af funktion. Undgå udsaettelse for stråling.

DISMANTLING INSTRUCTIONS

Dismantling of the Lens Cassette

1) Uncatch 4 catches along the edge of the Cassette door

(pos 5) as shown in figure 1 and 2 to remove the Lens
cassette (pos 2).

2-1 2-1

Figure 2: Left Cassette door

Figure 1

Dismantling the 3CDC Module

1) Loosen the 4 screws, slide Cover top (pos 30) towards the

rear and remove it upwards.

2) Loosen 3 screws slide the Panel right (pos 26) towards the

rear and remove it outwards. Do likewise for the Panel left
(pos 27).

3) Push the gear slowly towards the front as shown in figure

A

3 until the CDC tray starts to move out of the Front Cabinet
(pos 8). The CDC tray is now disengage and can be pulled
out completely.

4) Remove the Cover Tray (pos 29) as shown in figure 4.

5) Loosen 4 screws A to remove the CDC Module (pos 28) as
shown in figure 3.

A

Figure 4

Dismantling of the Panel Rear

1) Loosen 6 screws C on the Panel rear (pos 24).

2) Press the 2 catches C1 inwards and dismantle the Panel
rear by pulling it towards the rear.

A

C1

2

Pull Rear
Panel out

Turn the Gear towards the Front
till the CDC Tray starts to open

1
Press Inwards

Figure 3

Figure 5

2-2

Dismantling of the Front Panel and Bottom Panel assembly

1) Remove 8 screws D mounting the Front board.

2) Remove 1 screw E supporting the bracket, Combi board
(pos 33) to the Panel front (pos 8).

3) Remove 1 screw F (see figure 5) mounting the Mains
transformer body to the Panel Bottom (pos 25).

Note: Care must be taken not to damage the board

because of the heavy Mains transformer.

2-2

Service pos A

4) The Front and Combi boards together with the Mains
transformer can now be remove.

5) Loosen 6 screws G and eject both cassette doors to
remove the Tape mechanism (pos 12).

Note: During re-assembly of the Tape mechanism

and Front board care must be taken to ensure
the wires are properly dressed and not touch­ing any moving parts on the Tape mechanism.

Figure 6

Figure 8

Figure 7

Note: After re-assembly, it is very important to ensure the

wires from the Tape mechanism are routed properly
to ensure that they do not touch/obstruct all moving
parts.

Service pos B

3-1

3-1

SERVICE TEST PROGRAM

TUNER
TEST

TUNER

Button pressed?

Y

Display Tuner Version

"ccc"

N

copied to the RAM (see Table1)

N

PRESET

1
2
3
4
5
6
7
8

9
10
11

TUNER

Button pressed?

Y

Service frequencies are

Tuner works normally

except:

PROGRAM button

Disconnect

Mains cord ?

Y

Service Mode left

Europe

"EUR"

87.5MHz
108MHz

531kHz

1602kHz

558kHz

1494kHz

87.5MHz

87.5MHz

87.5MHz

87.5MHz
98MHz

Note: * Depending on the selected grid frequency (9 or 10kHz)

By holding the TUNER and R buttons depressed while switching on the Mains supply, one
of the undermentioned features will be activated:

- the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/21) version.

- the extended FM1 (65.81MHz - 74MHz) is toggled on and off for East Eur. (/34) version.

N

East Eur. Extended-band

"EAS"

65.81MHz
108MHz

74MHz

87.5MHz

531kHz

1602kHz

558kHz

1494kHz

98MHz

70.01MHz

65.81MHz

Table 1

To start service test program

plugging in the mains cord

QUARTZ
TEST

O

Button pressed?

Y

Display shows

32K

Output at (Front Board)

pin 80 of uP = 2048Hz

O

Button pressed?

Y

Display shows

8M

Output at (Front Board)

pin 80 of uP = 1,953.125Hz

9

Button pressed?

Y

Note: During the 3CDC tray may "jerks" open

& close or the carousel may rotates
slightly. This is due to sharing of control
lines during the Service test program.

East Eur.

"EAS"

87.5MHz
108MHz

531kHz

1602kHz

558kHz

1494kHz

87.5MHz

87.5MHz

87.5MHz

87.5MHz

98MHz

USA

"USA"

87.5MHz
108MHz

530kHz

1700kHz

560kHz

1500kHz

98MHz

87.5MHz

87.5MHz

87.5MHz

87.5MHz

N

N

N

Oversea

"OSE"

87.5MHz
108MHz

530/531kHz*

1700/1602kHz*

560/558kHz*

1500/1494kHz*

98/87.5MHz*

87.5MHz

87.5MHz

87.5MHz

87.5/98MHz*

hold P & TAPE
depressed while

Display shows the

ROM version *

"S-Vyy"

(Main menu)

S refers to Service Mode.
V refers to Version.
yy refers to Software version number of Processor.

(Counting up from 01 to 99)

SERVICE
PLAY MODE

STANDBY-ON

Button pressed?

Y

Set is in Service PLAY Mode.

In case of failures, error

codes according to table 2

will be displayed.

The Service Play Mode is intended to
detect and identify the failures in the CD Mode.

In this mode the electronics will still function
even when an error is detected so that
repair activities can be carried out.

Error code

E1000

Error Description
Focus Error

Triggered when the focus could not be found within a certain time when starting up the CD
or when the focus is lost for a certain time during play.

E1001

E1002

Radial Error
Triggered when the radial servo is off-track for a certain time during play.

Sledge In Error
The sledge did not reach its inner position (inner-switch is still close) before approximately
6 Sec. have passed by. Inner-switch or sledge motor problem.

E1003

Sledge Out Error
The sledge did not come out of its inner position (inner-switch is still open) before approximately
250 mSec. have passed by. Inner-switch or sledge motor problem.

E1005

Jump-offtrack error
Triggered in normal play when the jump destination could not be found within a certain time.
When this error occurred, software will try to recover by initiating the jump command again.
If it is recoverable, the disc will continue to play.

E1006

E1007

E1008

Subcode Error
Triggered when a new subcode was missing for a certain time during play.

PLL Error
The Phase Lock Loop could not lock within a certain time.

Turntable Motor Error
Generated when the CD could not reached 75% of speed during startup within a certain time.
Discmotor problem.

E1020

E1070

E1071

E1079

Focus Search Error
The focus point has not been found within a certain time.

This happens when the carousel switch is defective and closed all the time, or when the
carousel is blocked when it is located exactly at a disc position.

This happens when the carousel switch is defective and does not closed electrically, or when
the carousel is blocked in between two disc positions. The time-out is approximately 5 Sec.

The drawer could not open or enter the inside position and is opening again. This happen when
the drawer is blocked and cannot go fully inside or when the drawer switch is defective and does
not close.

N

note 1 : JAZZ & TECHNO are on while OPTIMAL is off, other LEDs status

are not important (applicable only for sets with LEDs)

Figure 1

note 2 : OPTIMAL is on while JAZZ & TECHNO are off, other LEDs status

are not important (applicable only for sets with LEDs)

Figure 2

Table 2

Mini 2002 FW-C1xx, C2xx, C3xx Dated: wk141

DISPLAY
TEST

DIM

Button pressed?

Y

Display shows Fig. 1

and selected LEDs on

(see note 1)

DIM

Button pressed?

Y

Display shows Fig. 2

and selected LEDs on

(see note 2)

9

Button pressed?

Y

TEST

Activated with

EEPROM TEST A test pattern will be sent to the EEPROM.

9 to Exit

ROTARY
ENCODER TEST

LEAVE SERVICE
TESTPROGRAM

Volume Knob

Jog Shuttle knob

Disconnect
mains cord

N

N

N

Various

other Tests

ACTION

R

QEEPROM FORMAT Load default data. Display shows "NEW"

or

DBBDEMO

"PASS" is displayed if the uProcessor read
back the test pattern correctly, otherwise
"FAIL" will be displayed.

for 1 second.

Caution!
All presets from the customer will be lost!!

Display shows value for 2 seconds.
Values increases or decreases in steps of 1
until 0 (Min.) or 40 (Max.) is reached.

DEMO will toggle on or off.
The message: "DEMO ON" or "DEMO OFF"
will scroll across the display to show the
new status of the set.

BLOCK DIAGRAM

4-1

4-1

FW-C155 Block diagram dd wk142-5

SET WIRING DIAGRAM

5-1

5-1

FW-C155 Wiring Diagram dd wk142-5

FTD DISPLAY PIN CONNECTIONS

6-16-1

COMBI & FRONT BOARDS

e

f

h

g

r

(2G - 9G)

1G

a

j

k

m

n

p

d

2G

b

Col 1

c

Dp

3G

11G

B5

B4

B3
B2
B1

4G

5G

6G

12G 11G

B10
B9
B8
B7
B6

7G

8G

B5
B4
B3
B2

B1

(12G)

B13
B12
B11

(11G)

9G

10G

B10
B9

B8

B7

B6

B5
B4
B3
B2
B1

TABLE OF CONTENTS

FTD Display pin connection .......................................... 6-1

Tape Adjustment & Mesurement ...................................6-2

Tuner Adjustment T able................................................. 6-2

Combi part Component Layout ..................................... 6-3

Combi part SMD Layout ................................................6-4

Tuner Circuit ..................................................................6-5

Supply & Power Amplifier Circuit...................................6-6

Tape Circuit .................................................................... 6-7

Front Circuit ...................................................................6-8

Front part SMD Layout ..................................................6-9

Front part Component Layout ..................................... 6-10

TDA7468 & TMP87CN71 Internal Block diagram....... 6-11

Electrical parts list........................................................ 6-11

P1
P2
P3
P4
P5
P6
P7
P8

P9
P10
P11
P12
P13

12G

B1
B2
B3
B4
B5

-

(1)

(2)

(3)

11G

B1
B2
B3
B4
B5
B6
B7
B8

B9
B10
B11
B12
B13

10G

(Left)

(Middle)

(Right)

(Up)

(Low)

9G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

8G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

a
h

j , p

k
b

f

m

g
c
e

r
n
d

6G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

5G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

4G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

3G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

2G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

1G7G

P14
P15
P16

FTD DISPLAY PIN NO.

FUNCTION

-

-

-

12

-

-

-

1

9

8

7

6

P

P

P

P

13

14

15

16

2

5

4

3

F

-

P

-

­1

-

-

-

-

3

3

8

9

-

F
2

-

3

3

3

3

5

4

6

7

1

2

-

­G

G

-

-

-

3

3

3

2

3

1

4

3

5

G

G

G

Col

Dp

-

3

2

2

2

0
6

G

2

9

8

7

6

7

8

9

10

G

G

G

G

11

-

-

-

2

2

2

2

2

5

3

4

-

-

12

G

G

-

-

-

2

1

2

1

1

8

0

9

-

P

P

P

3

1

2

-

-

-

1

1

1

1

6

4

7

5

P

P

P

P

5

7

4

6

-

-

-

1

1

1

1

3

2

1

0

P

P

P

P

8

9

10

11

VARICAP ALIGNMENT

FM RF

FM IF

VCO

AM IF

AM RF

3)

108MHz

87.5MHz

(65.81MHz)

87.5MHz

(65.81MHz)

87.5MHz

(65.81MHz)

279kHz
153kHz

1602kHz

531kHz

5130

check

5122

check

5123

check

8V ±0.2V

4.3V ±0.5V

(1.2V ±0.5V)

8V ±0.2V

1.1V ±0.4V
8V ±0.2V

1.1V ±0.4V

1494kHz

558kHz

560kHz 5102

1500kHz

5103198kHz

1494kHz

558kHz

560kHz

1500kHz

198kHz

2106
5102

2106

3142 152kHz ±1kHz

1)

98MHz

5112

MAX

FM

87.5 - 108MHz

(65.81 - 74, 87.5 - 108MHz)

LW

153 - 279kHz

MW

FM/MW/LW- version, 9kHz grid

531 - 1602kHz

1700kHz

530kHz

5123

check

8V ±0.2V

1.1V ±0.4V

1602kHz

531kHz

5123

check

6.9V ±0.2V

1.1V ±0.4V

108MHz

108MHz 2155

5131

MW

FM/AM-version, 10kHz grid

530 - 1700kHz

FM

MW

LW

98MHz, 1mV

continuous wave

450kHz

connect pin 6 of

IC 7101 (AM Osc.)

with 3.3kΩ to Vcc

Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.

4

1

3

5

5

A

A

5119FM

10.7MHz, 45mV

continuous wave

2D

mod=1kHz

∆f=±22.5kHz

1)

If sensitivity of frequency counter is too low adjust to max. channel separation

(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)

Repeat

ECO6, Sys + PA with frame aerial, 070799

TUNER ADJUSTMENT TABLE

( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )

∆f=±10kHz

VRF = 0.5mV

C

see
remark

2)

220R

100nF

36

IC 7101

220R

100nF

40

IC 7101

2141

shortcircuit
to block AFC

21

IC 7101

max.

symmetric

f

o

AM AFC

MW

C

continuous wave

VRF = 2mV

5111

5114

2

0 ± 2 mV DC

0 ± 3 mV DC

MW

4)

FM/MW/LW- and FM/MW-version
( 9kHz grid)

531 - 1602kHz

B

∆f = ±30kHz
V

RF

as low as

possible

max.

symmetric

f

o

MW

FM/AM-version, 10kHz grid

530 - 1700kHz

3)

For AM RF adjustments the original frame antenna has to be used !

2)

RC network serves for damping the IF-filter while adjusting the other one.

4)

MW has to be aligned before LW.

Waverange Input frequency Input Tuned to Adjust Output Scope/Voltmeter

FM

87.5 - 108MHz

(65.81 - 74, 87.5 - 108MHz)

FM/MW-version, 9kHz grid

531 - 1602kHz

(as low as

possible)

TAPE ADJUSTMENTS & MEASUREMENTS

6-26-2

General

ADJUST

MOTOR SPEED

CHECK

WOW & FLUTTER

ADJUST

AZIMUTH

Playback

CASSETTE

SBC420

(4822 397 30071)

3150Hz

SBC420

(4822 397 30071)

3150Hz

SBC420

(4822 397 30071)

10kHz

TEST

RECORDER
MODE

PLAY

deck A or B

PLAY

deck A or B

PLAY deck A

PLAY deck B

MEASURE
ON

or

11 12

LEFT RIGHT

or

headphone socket

or

11 12

LEFT RIGHT

or

headphone socket

11 12

LEFT RIGHT

or

headphone socket

READ ON

frequency
counter

W&F-meter check only

mV-meter

or

oscilloscope

left hand screw

CHECK

PLAYBACK
FREQUENCY RESPONSE

(4822 397 30071)

SBC420

PLAY deck A

PLAY deck B

or

11 12

LEFT RIGHT

mV-meter Check limits see fig.1

ADJUST

with to

3758

3150Hz ±1%

≤0.4 % DIN or

≤0.35 % CCIR

max. output level

& left=right

Recording

CHECK

OVERALL
FREQUENCY RESPONSE

Input signal: 3mV
100Hz, 250Hz, 1kHz,
10kHz

via or

CHECK

DISTORTION

Input signal: 300mV

via or

PRE-ADJUST

BIAS

FERRO

FERRO

RECORDED

CASSETTE

13

14

13

1kHz

14

Remark: If high frequencies are not within lower limit, decrease bias and re-measure.

FERRO

RECORDED
CASSETTE

RECORD

RECORD

PLAY

RECORD

PLAY

15

or

11 12

LEFT RIGHT

mV-meter

mV-meter check only limits see fig.2

or

11 12

LEFT RIGHT

THD-meter check only ≤5%

If distortion is too high increase bias and re-measure.

level(dB)

8dB

80

250

figure. 1

6dB

8dB

f(Hz)

4k

10k

level(dB)

8dB

(10dB HSD)

100

250

5701

6dB

figure. 2

4k

8dB

(10dB HSD)

10k

14V

rms

(40Vpp)

adj. ECO MTF DD AS, 110399

f(Hz)