Siemens -- CR1.pdf

21T3

SERVICE MANUAL

AEP Model

Chassis No. SCC-L33M-A

CR1

CHASSIS

SPECIFICATIONS

Dimensions and weight

CRT:

Horizontal frequency:

30 kHz .... 130 kHz

(multi-scanning)

50 cm (21“)

Visible diagonals:

50 cm

Refresh rate:

50 kHz .... 170 Hz

Dot pitch:

0.24 mm (aperture grille)

Maximum pixel rate:

300 MHz

Maximal resolution:

1920 × 1440 pixels

Power supply:

switches automatically

100 V .... 240 V, 50 Hz - 60 Hz

Preset picture size (for 4:3 modes):

388 mm ×

291 mm

Dimensions (W ×

H × D):

497 mm ×

502 mm ×

485 mm

Power consumption:

< 135 W (ON, Normal mode)

Weight:

30.5 kg

(see power management):

< 3 W (OFF mode)

Accessories:

Power cable (1.8 m)

data cable (1.8m)

Environmental conditions

Environment class 3K2, IEC 721

Rated range of operation:

Storable display modes:

15 (3 of which are preset)

15 °

C .... 35 °

Electrical data

Video:

Humidity:

20 % .... 85 %

analogue, positive, 0.7 Vp-p,

75 Ohm

Limit range of operation:

C .... 40

Humidity:

20 % .... 85 %

Synchronisation:

Separate Sync. TTL

Composite Sync. TLL/Sync. on

Green

Condensation must be avoided.

COLOR MONITOR

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety

checks before releasing the set to the customer:

1. Check the area of your repair for unsoldered or poorly-soldered

connections. Check the entire board surface for solder splashes and

bridges.

2. Check the interboard wiring to ensure that no wires are “pinched” or

contact high-wattage resistors.

3. Check that all control knobs, shields, covers, ground straps, and

mounting hardware have been replaced. Be absolutely certain that you

have replaced all the insulators.

4. Look for unauthorized replacement parts, particularly transistors, that

were installed during a previous repair. Point them out to the customer

and recommend their replacement.

5. Look for parts which, though functioning, show obvious signs of

deterioration. Point them out to the customer and recommend their

replacement.

6. Check the line cords for cracks and abrasion. Recommend the

replacement of any such line cord to the customer.

7. Check the B+ and HV to see if they are specified values. Make sure your

instruments are accurate; be suspicious of your HV meter if sets always

have low HV.

8. Check the antenna terminals, metal trim, “metallized” knobs, screws, and

all other exposed metal parts for AC Leakage. Check leakage as

described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and from all

exposed metal parts to any exposed metal part having a return to chassis,

must not exceed 0.5 mA (500 microamperes).

Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-

540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital

multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or

battery-operated AC voltmeter. The “limit” indication is 0.75 V, so

analog meters must have an accurate low-voltage scale. The Simpson 250

and Sanwa SH-63Trd are examples of a passive VOMs that are suitable.

Nearly all battery operated digital multimeters that have a 2 V AC range

are suitable. (See Fig. A)

To Exposed Metal

Parts on Set

Voltmeter

(0.75 V)

0.15

1.5 k

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

21T3 (E)

WARNING!!

NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE

DEGAUSS COIL HAS BEEN REMOVED.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK

ON THE

SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE

PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE

THESE COMPONENTS WITH SONY PARTS WHOSE PART

NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUST-

MENTS THAT ARE CRITICAL FOR SAFE OPERATION ARE

IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES

WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IM-

PROPER OPERATION IS SUSPECTED.

21T3 (E)

POWER SAVING FUNCTION

If your computer is equipped with power management, the monitor can support this func-

tion fully. Here the monitor does not distinguish between the individual energy-saving modes

of the computer (standby mode, suspend mode and OFF mode), as it is capable of immedi-

ately switching into the mode with the highest energy-saving effect.

Stage

Energy-saving mode

Power indicator

glows green

glows orange

Function

Monitor

operating

is dark

normally

Power consumption

normal 135 W

reduced to < 3 W

If your PC detects inactivity (no input) it sends an appropriate signal to the monitor to

reduce the power consumption (energy-saving mode). The power indicator of the monitor

changes colour to indicate the status change.

Once an input is mode at the PC the screen contents are redrawn and full power is restored.

For detailed information on how energy-saving mode operates refer to the Operating Manual

or Technical Manual of your PC.

When the monitor is switched to the energy-saving mode by the power management system

a power consumption of up to 3 W is maintained to feed the circuit for redrawing the screen

contents.

To completely switch off the power consumption, switch off the monitor or the system unit.

21T3 (E)

DIAGNOSIS

Failure

Power LED

+B failure

Amber

Off

(0.5 sec)

Horizontal / Vertical Deflection

failure, Thermal protector

ABL protector

Amber

Off

(1.5 sec)

(0.5 sec)

Amber

Off

(0.5 sec)

(1.5 sec)

HV failure

Amber

Off

Amber

Off

(0.25 sec)

(1.25 sec)

Aging / Self Test

Amber

Off

Green

Off

(0.5 sec)

Out of scan range

Green (OSD indication)

Aging Mode (Video Aging) : During Power Save, press MENU button for longer than 2 second.

Self Test (OSD Color Bar)

: During Power Save, push button for longer than 2 second.

21T3 (E)

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