Philips scar 3 1 service manual

Page 1

PCS 92 000

Philips Car Systems

V'm

automotive

annesmann
VDO

Car Cassette Deck SCA-ns.3 SCA-ns.1

GENERAL

ervice Manua

12v Q-li

The SCA-R3.3 is a full-logic Servo Controlled Autoreverse tape deck which is fully uP-controlled.
The deck is controlled by the headset via the standardized PC bus.
Version -Fi3.3 is the standard version with an 8-pole MOLEX PICOFLEX interface connector.
The SCA-R3.1 has an 11-pole MOLEX SPOX interface cable.
Mechanically the -R3.1 version is the same as the -Fl3.3.

TECHNICAL DATA

Operating voltages

Tape speed

Number of tracks

Wow and Flutter

S/N ratio

Crosstalk suppression (track 2-3)
Channel separation (track 1-2/3-4)
Fast winding time

Bus interface

Weight (only mechanism)

10.0 -16VDC(V1)
(13.2VDC nom.)
4.75 - 5.25VDC (V2)
(5.0VDC nom.)

4.76 cm/s (-1..+3%)
2 x 2

s 0.3% DIN weighted
2 46dB (measured at preamplifier)
2 50dB

2 40dB

s 100 sec (0-60)

PG

400 g

Published by VDO Car Communication Printed in The Netherlands ©Copyrighl reserved Subject to modification

4822 725 25481

Page 2

PCS 92 000

3.1

3.2

4.1

4.2

MAINTENANCE

The tape deck mechanism requires periodic
cleaning.

Cleaning cassette
- Use drop-in cleaning cassette 830114
(4822 389 20035)

Cleaning with alcohol or spirit

- Cleaning with alcohol or spirit is also
possible.

- Especially the following parts need
cleaning:
- Playback head pos. 28.
- Capstans pos. 9/11 and pressure

roller assy pos. 42.

- Pulley pos. 10 and motor pulley.

ADJUSTMENTS AND CHECKS

Equipment

Equipment required:

- Universal test cassette SBC419
- 4822 397 30069

- Universal test cassette SBC42O
- 4822 397 30071

- Friction test cassette 811/CTM
- 4822 395 30054

- Spring scale 50-5009
- 4822 395 80028

- Jig / puller for clutch
4822 395 60039

- Wow & Flutter meter

- AC mV meters

Roller pressure 4'3

The pressure on the capstan should be

250 - 350 grammes (2.5 - 3.5 N).

This pressure is measured as follows

(in NOR and REV play):

- Select NOR play mode.

- Push the back pressure roller spindle of
pos. 42 back by means of the spring
scale.

- The back pressure roller can be reached
via the opening at the rear of the deck
(see figure i).

4.4

SCA-R3

rear of deck

spindle

pressure

flywheel

spflng
scale

FIGSCARBAI

Figure i

- At the point where the pressure roller and
capstan (of flywheel pos. 11) just dis-
engage the spring scale should be read.

- If the pressure is incorrect, replace roller
assy.

- Select REV play mode.

- Push the front pressure roller spindle of
pos. 42 back by means of the spring
scale.

- At the point where the pressure roller and
capstan (of flywheel pos. 9) just dis-
engage the spring scale should be read.

- If the pressure is incorrect, replace roller
assy.

Take-up wheels pos. 21

- Insert friction test cassette 811/CTM
(NOR and REV).

- Play mode take-up torque should be
3.5 - 7.5 mNm.

- Fast wind torque should be 4 - 15 mNm.

- If the torque is incorrect, replace take-up
wheel(s) pos. 21.

Wow 8: Flutter I tape speed

This check should be carried out on a

COMPLETE car radio set; proceed as

follows:

- Connect-the wow & flutter meter to the
LS outputs.

- Insert test cassette SBC419 or 880420
and play the 3,150 Hz signal.

- The wow & flutter value should be s 0.3%
(DIN weighted).