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+B overcurrent

2 times

I-Prot

4 times

IK

5 times

*One flash count is not used for self-diagnostic.

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER LAMP from flashing.

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible
to bring up past occurrences of failure on the screen for confirmation.

In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:

Display

Channel 5

Sound volume

Note that this differs from entering the service mode (sound volume 

).

Power ON

+

SELF DIAGNOSTIC

2: 000

3: N/A

4: 000

5: 001

101: N/A

Numeral “0” means that no fault was detected.

Numeral “1” means a fault was detected one time only.

STANDBY/TIMER LED

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs.
When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the
repairs.

To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed,
as shown below:

ENTER

Channel 8

To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

MA BOARD

IC301

Y/CHROMA JUNGLE

A BOARD

IC502

V. OUT

MA BOARD

IC001

SYSTEM

MA BOARD

IC003

MEMORY

IK IN

FROM

CA BOARD

CN705 PIN 1 

   

36

HP/PROTECT

SDA

FROM

A BOARD

IC501 PIN 3

33

61

IO-SDAT

O-LED

43

REF

3

I-PROT

IO-BDAT

5

42

B-DAT

5

22

DISPLAY

Occurs when an overcurrent on the +B (135V) line is detected by pin 33 of IC301 (MA Board). If
the voltage of pin 33 of IC301 (MA Board) is less than 1V when V.SYNC is more than seven
verticals in a period, the unit will automatically turn off.

Occurs when an absence of the vertical deflection pulse is detected by pin 5 of IC001 (MA
Board). Power supply will shut down when waveform interval exceeds 2 seconds.

If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be
detected by IC301 (MA Board). TV will stay on, but there will be no picture.

*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).

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 touching 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.

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 instructions.

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’s 250 and
Sanwa SH-63TRD are examples of passive VOMs that
are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable
(see Figure A).

A cold-water pipe is a guaranteed earth ground; the cover-
plate retaining screw on most AC outlet boxes is also at earth
ground. If the retaining screw is to be used as your earth
ground, verify that it is at ground by measuring the resistance
between it and a cold-water pipe with an ohmmeter. The
reading should be zero ohms. If a cold-water pipe is not
accessible, connect a 60- to 100-watt trouble- light (not a
neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot
side on the line; the lamp should light at normal brilliance if the
screw is at ground potential (see Figure B).

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe

The instructions mentioned here are partial abstracts from the Operating Instruction Manual.

The page numbers shown reflect those of the Operating Instruction Manual.

Read this chapter before setting up your TV for the first time. This section
covers basic connections in addition to any optional equipment you may
be connecting.

Depending on the cable available in your home, choose one of the
connections below:

If you are connecting to an indoor or outdoor antenna, you may need to 
adjust the orientation of the antenna for best reception. 

Operating Instructions

Some pay cable TV systems to use scrambled or encoded signals that
require a cable box to view all channels.

Connect the coaxial cable from your cable service to the IN jack on
your cable box.

Connect a coaxial cable (not supplied) from the OUT jack on your
cable box to the VHF/UHF jack on your TV.

For this set up, you can switch between scramble channels (through your
cable box), and normal (CATV) channels by using the

button.

If you will be controlling all channel selection through your cable box, you 
should consider using the Channel Fix feature, (see page 26).

If you are connecting a cable box through the AUX input and would like to 
switch between the AUX and normal (CATV) input, you should consider using 
the Channel Fix feature, (see page 26).

Your Sony remote control can be programmed to operate your cable box, 
(see page 36).

When using PIP, you cannot view the AUX input in the window picture.