Preparation For Servicing - Philips MAGNAVOX 20MC4304 Service Manual

How to Enter the Service Mode
Caution 1:
1. Optical sensors system are used for Tape Start
and End Sensor on this equipment. Read this
page carefully and prepare as described on this
page before starting to service; otherwise, the unit
may operate unexpectedly.
Preparing 1:
1. Cover Q202 (START SENSOR) and Q201 (END
SENSOR) with Insulation Tape or enter the
service mode to activate Sensor Inhibition
automatically.
Note: Avoid playing, rewinding or fast forwarding the
tape to its beginning or end, because both
Tape End Sensors are not active.
How to Enter the Service Mode
1. Turn power on.
2. Use service remote control unit and press [DISC
MENU] button. (See page 1-7-1.)
3. When entering the service mode, one of the
number (1, 2 or 4) will display at corners of the
screen.
4. During the service mode, electrical adjustment
mode can be selected by remote control key.
(Service remote control unit).
Details are as follows.
Key
Picture adjustment mode: Press the
[PICTURE] button to change from BRT
(Bright), *CNT (Contrast), *COL (Color),
*TNT(Tint), *V-TNT(V-Tint) and *SHP
PICTURE
(Sharpness). Press [CH o/p] buttons
to display Initial Value.
*Marked items are not necessary to
adjust normally.
C-Trap adjustment: See adjustment
instructions page 1-7-2.
Y DL Time TV/Y DL Time EXT/Y SW
0
LPF/Black Stretch Off/ Black Stretch
CONT/C. Angle data values setting:
See adjustment instructions page 1-7-3.
1 No need to use.
H f adjustment mode: See adjustment
0
2
instructions page 1-7-5.
3 No need to use.
Auto record mode: Perform recording
4 (15 Sec.) --> Stop --> Rewind (Zero
return) automatically.
Head switching position adjustment:
5
See adjustment instructions page 1-7-8.
6 No need to use.

PREPARATION FOR SERVICING

Adjustment Mode
Key
Purity check mode: Shows Red, Green,
7 Blue or White cyclically on the screen
each time the [7] button is pressed.
H. Position adjustment: See adjustment
8
instructions page 1-7-7.
V. Shift/V.Size adjustment: See
9
adjustment instructions page 1-7-8.
CD-VOL/DVD-BRT/DVD-CNT/DVD-
VOL o SHARP data values setting: See
adjustment instructions page 1-7-4.
Cut-off adjustment: See adjustment
instructions page 1-7-5.
DATA/SLP REC/MONO data values
VOL p setting: See adjustment instructions
page 1-7-6.
White balance adjustment: See
adjustment instructions page 1-7-6.
Caution 2:
1. The deck mechanism assembly is mounted on the
Main CBA directly, and SW1211 (REC-SAFETY
SW) is mounted on the Main CBA. When deck
mechanism assembly is removed from the Main
CBA due to servicing, this switch can not be
operated automatically.
Preparing 2:
1. To eject the tape, press the [STOP/EJECT] button
on the unit (or Remote Control).
2. When you want to record during the Service
mode, press the [Rec] button while depressing
SW1211 (REC-SAFETY SW) on the Main CBA.
Q201
(END SENSOR)
SW1211
(REC-SAFETY SW)
1-4-1
Adjustment Mode
Q202
(START SENSOR)
MAIN CBA
T1102PFS