Philco PF2118 User manual

SERVICE MANUAL Colour Television
Product Code:
Original Version
Chassis Series: LA7-A
BF4J
FILE NO.
Model No. PF2118
Service Ref. No.
(Argentina)
Give complete “SERVICE REF. NO.” for
parts order or servicing. It is shown on the
rating plate at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television trans-
mission system and power source differ from
the design specifications. Refer to the speci-
fication table.
Specifications
Power Source . . . . . . . . . AC220V, 50Hz / 60Hz
Receiving System . . . . . . PAL (M/M, N/N), NTSC (M/M)
Channel Coverage
Antenna mode VHF: CH02-CH13, UHF: CH14-CH69
CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22
Super band: CH23-CH36, Hyper band: CH37-CH64
Ultra band: CH65-CH94 and CH100-CH125
Low mid band: CH95-CH99
Aerial Input Impedance . . 75Ω
Input Terminals
AV1 (Video): Phono jack ✕1
AV1 (Audio): Phono jack (R/L) ✕1 set
AV2 (Video): Phono jack ✕1
AV2 (Audio): Phono jack (R/L) ✕1 set
Output Terminals
Video Monitor Output: Phono jack ✕1
Audio Monitor Output: Phono jack (R/L) ✕1
Headphone Jack: Mini stereo jack ✕1
Sound Output (RMS) . . . . 3W + 3W
Speakers . . . . . . . . . . . 5cm x 9cm x 2 pcs.
Dimensions . . . . . . . . . 596(W) X 493(H) X462(D) mm
Weight . . . . . . . . . . . . . approx. 20.5 Kg
Specifications subject to change without notice.
映像メディア（事）デザイン部
JXMRR
CH
-
VOL+
MENU
VIDEO
LAUDIOR
AV2
IN
POWER

Contents
-2-
SafetyNotice ........................................................................... 2
ChassisBlockDiagram ................................................................. 3-4
ICBlockDiagrams..................................................................... 5-8
ServiceAdjustments................................................................... 9-17
PurityandConvergenceAdjustment....................................................... 18
CabinetPartsList....................................................................... 19
ChassisElectricalPartsList............................................................ 20-26
Safety Notice
SAFETY PRECAUTIONS
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, on
the chassis or the picture tube.
3: When replacing a chassis in the cabinet, always
be certain that all the protective devices are
installed properly, such as, control knobs, adjust-
ment covers or shields, barriers, isolation resistor-
capacitor networks etc.. Before returning any
television to the customer, the service techni-
cian must be sure that it is completely safe
to operate without danger of electrical shock.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially con-
structed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must
be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazard-
ous X - RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer
to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified
limits, take necessary corrective action. Carefully follow the instructions for + B1 volt power supply adjustment,
and high voltage check to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list
in this manual be used for component replacement designated by mark . No deviations from resistance
wattage or voltage ratings may be made for replacement items designated by mark .

Chassis Block Diagrams
-3-
AUDIOPW
AUDIOPW
AERIAL
VIDEO
VERT-OUT
SAW FILTER (LA76931) HORIZ-DRIVE HORIZ-OUT
SPEAK(L)
SPEAK(R)
AUDIO-OUT
AV1 / AV2 AUDIO INPUT
AUDIO OUTPUT
FBT PULSE
FBT IN
POWER
CRT DRIVE
MAIN SIGNAL PROCESSING CIRCUIT

Chassis Block Diagrams
-4-
IC 601 POWER SUPPLY IC (STRW6753)
FUNCTIONAL BLOCK DIAGRAM

IC Block Diagrams
-5-
IC201 < IF/Video/Chroma/Def./CPU > LA76931

IC Block Diagrams
-6-
S ample a ppl ication ci r cuits
S ample a ppl ication ci r cuits2
L A 78040B /040/041/045
Vref
+V cc
IN
1 2 3 4 5 6 7
L A 78040B /040/041/045
Vr ef
+V cc
IN
1 2 3 4 5 6 7
-V cc
123 4 5 6 7
G ND
Ver.O U T P UT
OU T PU T S T AG E V cc
N ON I N V.I N P UT
IN V E R T I N G I N P UT
V c
c
P U M P U P O UT
P ump
U
p
+
-
AMP
T her mal
P r otection
L A78040B /040/041/045
5V
+V cc(24V)
IN
1 2 3 4 5 6 7
10K 33K
10K
11K
4.7u
1000u1.0
330
1.0 0.1u
100u
100u
10K
10K
1u
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IC001<AUDIO AMP> LA42032

IC Block Diagrams
-7-
LA72703 BTSC Decoder - Reference Apprication -
10 11 12
Slave Address = 80h ( 1000 000* ) :Pin8=OPEN/GND
Slave Address = 84h ( 1000 010* ) :Pin8=H
Vcc 5V
+
98
65 7
4
21 3
21
2324 22 15 14 13
161719
20 18
MATRIX
MODE
OUT
REGULATOR
+ ++
+
++
+
+
+
4.5M
BPF
LPF
SIF DEMOD
SAP BPF
SAP
DEMOD
L-R
DEMOD ST/SAP
SW
LPF
-6dB
PILOT
CANCELLER
STEREO
PLL
PILOT
DET
PILOT
LEVEL DET
IIC
DECODE
SYSTEM
CONTROL
Offset
Cancell
dbx processor
SAP
DET
4u7 4u7 22u 4u7
OUT(L) OUT(R)
MODE
Monitor
2u2
1u
1u
0.1?
1u
4k7
MUTE
L+R L-R/SAP
ST
SAP
Address
Control
GND
MUTE
Wide RMS DET
Spectral DET
Spectral In
Offset Cancel
0.1u
0.1u
4u7
1u to
0.33u
SIF SIGNAL
from Tuner
Address
Control IIC
DATA
IIC
CLOCK
2u2 22u
Spectral RMS
DET
100u
0.1u
47u
+
10u
+
10u
33n 33n
+
1u
+
560k
LPF
IC3401 LA72703 STEREO DECODER

-8-
IC Block Diagrams
IC3402 AUDIO SIGNAL PROCESSOR
R2A15908SP
INR2
INR1
INL1
INL2
INL5
IGOUTL
VOLINL
VOLINR
BASSL1
INL3
INL4
IGOUTR
BASSR2
ROUT
LOUT
AGND
SDA
SCL
DGND
BASSL2
TRER
VCC
REFIN
BASSR1
INR4
INR3
INR5 28
27
26
25
24
23
22
21
20
19
1
2
3
4
5
6
7
8
9
10
18
17
11
12
Mode selector
Surround
REF
Input
selector
13
14
16
15
Tone control
Rch Bass/Treble
Volume
0~+20dB
/2dB step
Input
selector
0~-87dB,-∞
MCU
I/F
Input gain
control
mute
mute
Tone control
Lch Bass/Treble
Volume
0~-87dB,-∞
0~+20dB
/2dB step
Mono
/Stereo
TREL

-9--9-
Service Adjustments
MENU
MENU
S1.11100101 S2.11110011
ADDRESS DATA
01 RFAGC 21
Item No. Item Data value
General
This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the
service adjustments.
2. Service Adjustments:
Press the CHANNEL UP or CHANNEL DOWN
button on the remote control handset to select the
desired service menu item you want to adjust.
Use the VOLUME + or
- to adjust the data. The + or
- button will increase or decrease the data
sequentially.
3. Exit from the Service Menu
Press the MENU button to turn off the Service Menu
display.
The data which is set in the service mode is stored
into the memory IC automatically.
[ Service Mode Display ]
Service Adjustment-1
1. Enter the Service Menu
While pressing the MENU button on the television, press the Number Key 2 on the remote control unit.
The Service Menu now appear.
IC802 (EEPROM) Replacement
When IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.
However, the bus data should be checked and some bus data should be set up before attempting the service adjustments. (See
pages 9 ~ 10 for detailed information.)
映像メディア（事）デザイン部
JXMRR
映像メディア（事）デザイン部
JXMRR
VOLUME +
VOLUME -
CHANNEL UP
CHANNEL DOWN

-10--10-
Service Adjustments
On-screen Service Menu
Following table shows the initial values which have been stored in the CPU ROM, and items for the service adjustments.
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should be
checked and be set up or readjusted according to the procedures described in the following pages.
Initial Setup Data marked with an * should be changed from Initial Value Data.
1 RFAGC 21 00～63 RFAGCadjustment
2 H-PHA 08 00～31 H-PHASEadjustment(50Hz)
3 V-DC40 00～63 V-POSITIONadjustment(50Hz)
4 V-SIZ 37 00～127 V-SIZEadjustment(50Hz)
5 V-SCO 12 00～31 Vertical-Scompensation(50Hz)
6 V-LIN11 00～31 Verticallinearityadjustment(50Hz)
7 H-P60 +4 -16～+15 DifferencevalueofH-PHASEadjustment(60Hz)
8 V-P60 -3 -32～+31 DifferencevalueofV-POSITIONadjustment(60Hz)
9 V-S60-4 -64～+63 DifferencevalueofV-SIZEadjustment(60Hz)
10 VSC60 0 -16～+15 DifferencevalueofVertical-"S"compensation(60Hz)
11 VLI60+1 -16～+15 DifferencevalueofVerticallinearityadjustment(60Hz)
12 OSDHP 35 0１～255 OSDhorizontalremarkposition
13 OSDC05 00～07 OSDContrast
14 V-SCP 03 0～7 V-SIZECOMP
15 VSHIFT 10 0~15 V.SHIFT
16 SBIAS70 00～127 SubBiasadjustment
17 RBIAS00 00～255 RedBiasadjustment
18 GBIAS 00 00～255 GreenBiasadjustment
19 BBIAS00 00～255 BlueBiasadjustment
20 RDRIV 64 00～127 RedDriveadjustment
21 GDRIV 08 00～15 GreenDriveadjustment
22 BDRIV 64 00～127 BlueDriveadjustment
23    Whitebalance(alateralline)
24 DRV   BrightandDarkofWhitebalanceadjustment
25 B-YD11 00～15 B-YDCLevel
26 R-YD11 00～15 R-YDCLevel
27 B-YDN 0 -16～+15 DifferencevalueofNTSCB-YDCLevel
28 R-YDN 0 -16～+15 DifferencevalueofNTSCR-YDCLevel
29 G-YA00 00～01 G-YAngle
30 RBGB10 00～15 R－Y／B－YGainBalance
31 RBAG08 00～15 Ｒ－Y／B－Y Angle
32 G-YAN 00 00～01 NTSC G-Y Angle
33 RBGBN +7 -8～+7 DifferencevalueofNTSCR-Y/B-YGainBalance
34 RBAGN +4 -8～+7 DifferencevalueofNTSCR-Y/B-YAngle
35 COGV 03 00～03 CoringGain
36 BLKS 00 00～03 Blk.str.start(W/Defeat)
37 BLKG00 00～03 Blk.STR.gain
38 BRTA 00 00～01 Brt.Abl.Def
39 BRST00 00～01 Mid.Stp.Def
40 BRTH00 00～07 Bright.Abl.Threshold
41 WPL 00 00～03 WPLOpe.Point(W/Defeat)
No Item Initial value Range Description