Table of Contents
Advertisement
5. Service Modes, Error Codes and Fault Finding
Index:
1. Test points.
2. Service Modes.
3. Problems and Solving Tips (related to CSM).
4. Error Codes.
5. The Blinking LED Procedure.
6. Protections.
7. Repair Tips.
5.1
Test Points
The chassis is equipped with test points printed on the circuit
board assemblies. These test points refer to the functional
blocks:
Table 5-1 Test Point Overview L01
Test point
Circuit
A1-A2-A3-..
Audio processing
C1-C2-C3-..
Control
F1-F2-F3-..
Frame drive
I1-I2-I3-..
Tuner & IF
L1-L2-L3-.
Line drive
P1-P2-P3-..
Power supply
S1-S2-S3-..
Synchronisation
V1-V2-V3-..
Video processing
The numbering is in a logical sequence for diagnostics. Always
start diagnosing within a functional block in the sequence of the
relevant test points for that block.
Perform measurements under the following conditions:
•
Service Default Alignment Mode.
•
Video: colour 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, while the Customer Service
Mode (CSM) is used for communication between dealer and
customer.
Service Modes
SW
SW name
UOC-type
cluster
1AP1
L01HA1-x.y
TDA9552/5
Abbreviations: H=Hotel, A= Asia Pacific, 1=Z,R and Y system.
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 when leaving SDAM
with "standby" key on remote control.
•
To override SW protections.
•
To perform alignments.
•
To start the blinking LED procedure.
Specifications
•
Tuning frequency:
–
475.25 MHz for PAL/SECAM (AP-PAL)
Service Modes, Error Codes and Fault Finding
Diagram
A8, A9 / A11
A7
A3
A4
A2
A1
A6
A5
Diversity
AP 1 page TXT
CL 16532108_005.pdf
120601
L01H.1A
–
61.25 MHz (channel 3) for NTSC set (AP-NTSC)
•
Colour system:
–
PAL-BG for AP-PAL.
–
NTSC M for PAL-NTSC
•
All picture settings at 50 % (brightness, colour 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-favourite 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 System 7 remote control type T374AH (RC-
transmitter RG4172BK) and key in the code '062596'
directly followed by the 'M' (menu) button or
•
Short circuit jumper wires 9631 and 9641 on the mono
carrier (see Fig. 8-1) and apply AC power. Then press the
power button (remove the short circuit after start-up).
Caution: Entering SDAM by short circuiting wires 9631 and
9641 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.
After activating SDAM, the following screen is visible, with S at
the upper right side for recognition.
SDAM Menu
L L L L
A A A A B C D
X . Y
E R R
X X
X X
X X
X X
X X
O P
X X X
X X X
X X X
X X X
D E F L E C T I O N
O P T I O N S
T U N E R
W H I T E
T O N E
G E O M E T R Y
Figure 5-1
1. LLLL
This is the operation hours counter. It counts the normal
operation hours, not the standby hours.
2. AAAABC-X.Y
This is the software identification of the main micro
controller:
–
A = the project name (L01H).
–
B = the region: E= Europe, A= Asia Pacific, U= NAFTA,
L= LATAM.
–
C = the feature and language:
–
(Europe: 1 = Basic, Basic Plus and System, English,
French, German and Italian)
–
(AP: 1 = Z, R and Y System, English, Malay and
Simplified Chinese)
5.
EN 15
S
X X X
X X X
X X X
>
>
>
>
>
CL 26532029_001.eps
080202
Advertisement
Chapters
Table of Contents
