Specifications

Service Modes, Error Codes, and Fault Finding
EN 20 L03.2U AA5.
5. Service Modes, Error Codes, and Fault Finding
Index:
1. Test points.
2. Service Modes.
3. Problems and Solving Tips.
4. ComPair
5. Error Codes.
6. The Blinking LED Procedure.
7. Protections.
8. Repair Tips.
5.1 Test Points
This chassis is equipped with test points in the service printing.
In the schematics test points are identified with a rectangle box
around Fxxx or Ixxx. On the PCB, test points are specifically
mentioned in the service manual as “half moons” with a dot in
the center.
Table 5-1 Test Point Overview
Perform measurements under the following conditions:
• Service Default Alignment Mode.
• Video: color bar signal.
• Audio: 3 kHz left, 1 kHz right.
5.2 Service Modes
Service Default Alignment Mode (SDAM) offers several
features for the service technician.
There is also the option of using ComPair, a hardware interface
between a computer (see requirements) and the TV chassis. It
offers the ability of structured trouble shooting, error code
reading and software version readout for all chassis.
Requirements: To run ComPair on a computer (laptop or
desktop) requires, as a minimum, a 486 processor, Windows
3.1 and a CD-ROM drive. A Pentium Processor and Windows
95/98 are however preferred (see also paragraph 5.4).
Table 5-2 SW Cluster
5.2.1 Service Default Alignment Mode (SDAM)
Purpose
• To change option settings.
• To create a predefined setting to get the same
measurement results as given in this manual.
• To display / clear the error code buffer.
• To override SW protections.
• To perform alignments.
• To start the blinking LED procedure.
Specifications
• Tuning frequency: 61.25 MHz (channel 3) for NTSC-sets
(Nafta).
• Color system: NTSC-M.
• All picture settings at 50 % (brightness, color contrast,
hue).
• Bass, treble and balance at 50 %; volume at 25 %.
• All service-unfriendly modes (if present) are disabled, like:
– (Sleep) timer,
– Child/parental lock,
– Blue mute,
– Hotel/hospitality mode
– Auto switch-off (when no “IDENT” video signal is
received for 15 minutes),
– Skip / blank of non-favorite presets / channels,
– Auto store of personal presets,
– Auto user menu time-out.
• Operation hours counter.
• Software version.
• Option settings.
• Error buffer reading and erasing.
• Software alignments.
How to enter SDAM
Use one of the following methods:
• Use a standard customer RC-transmitter and key in the
code 062596 directly followed by the “M” (menu) button or
• Short jumper wires 9257 and pin 4 of 7200 on the mono
carrier (see Fig. 8-1) and apply AC power. Then press the
power button (remove the short after start-up).
• Caution: Entering SDAM by shorten wires 9257 and pin 4
of 7200 will override the +8V-protection. Do this only for a
short period. When doing this, the service-technician must
know exactly what he is doing, as it could lead to damaging
the set.
• Or via ComPair.
After entering SDAM, the following screen is visible, with S at
the upper right side for recognition.
Figure 5-1 SDAM Menu
TEST POINT CIRCUIT DIAGRAM
P1,P2,P3,P4,P5 POWER SUPPLY A1
D1,D2,D3,D4,D5,D6,D
7,D8,D9,D10
Deflection A2
T1 TUNER & IF A3
V1,V2,V3,V4,V5,V6,V7,
V8,V9,V10,V11
VIDEO PROCESSING A4
A1,A2,A3,A4,A5 AUDIO PROCESSING A5
A7,A8,A9,A10,A11 AUDIO AMPLIFIER +
MONO SOUND
PROCESSING
A6
F1 FRONT IO +
FRONT CONTROL +
HEADPHONE
A7
V12,V13,V14,V15,V16,
V17
CRT PANEL B1
SW
Cluster
Software
name
UOC type UOC
Diversity
Special
Features
L3SUM1 L03UM1 x.y TDA9377 55K
ROM Size
Mono
L3SUN1 L03UN1 x.y TDA9377 55K
ROM Size
Stereo
(non DBX)
Abbreviations in Software name:
U = Nafta, M = Mono, N = Stereo.
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