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Philco PF2975 Service Manual
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Philco PF2975 Service Manual

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SERVICE MANUAL Colour Television
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
Video IF . . . . . . . . . . . . .45.75MHz
Aerial Input Impedance 75Ω
Input Terminals
AV1 (Video): Composite Video Input (Phone Jack) x 1
S-Video Input (Separated Y/C) DIN 4-pin Jack x 1
AV1 (Audio):L/R Stereo Input (Phone Jack) x 1 set
AV2 (Video):Composite Video Input (Phone Jack) x 1
AV2 (Audio):L/R Stereo Input (Phone Jack) x 1 set
AV3 (Video): Component Y, C
AV3 (Audio): L/R Stereo Input (Phone Jack) x 1 set
Output Terminals
Video Monitor Output: Phono jack x 1
Audio Monitor Output: L/R Stereo Output (Phone Jack) x 1 set
Headphone Jack: Mini stereo jack x 1
Sound Output (RMS) . . . 5W + 5W
Speaker . . . . . . . . . . . . . 6cm x 12cm x 2 pcs.
Dimensions . . . . . . . . . . 749(W) x 586(H) x 486(D)mm
Weight . . . . . . . . . . . . . . approx. 41.5 Kg
Specifications subject to change without notice.
C8AJ
VIDEO
L AUDIO R
TV/A V
MENU
VOL
CH
POW ER
, C
Input (Phone Jack) x 1 set
B
R
FILE NO.
Model No. PF2975
Service Ref. No. PF2975-00
Product Code: 111376508
Original Version
Chassis Series: LB4-C
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 specifi-
cation table.
(Argentina)

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Summary of Contents for Philco PF2975

  • Page 1 FILE NO. SERVICE MANUAL Colour Television Model No. PF2975 (Argentina) Service Ref. No. PF2975-00 VIDEO L AUDIO R TV/A V MENU POW ER Specifications Product Code: 111376508 Power Source ..AC220V, 50Hz / 60Hz Receiving System .

  • Page 2: Table Of Contents

    Contents Safety Notice ............... . 2 Chassis Block Diagram .

  • Page 3: Chassis Block Diagram

    Chassis Block Diagrams MAIN SIGNAL PROCESSING CIRCUIT...
  • Page 4 Chassis Block Diagrams SYSTEM CONTROL...

  • Page 5: Ic Block Diagrams

    IC Block Diagrams IC201 < IF/Video/Chroma/Def. > LA76828 Audio Output SIF Input FM Output/Selected SIF APC Filter Audio Output SIF Output PIF AGC Ext. Audio Input RF AGC Output PIF Input1 APC Filter VCO Coil 1 PIF Input 2 VCO Coil 2 IF Ground VCO Filter IF Vcc...
  • Page 6 IC Block Diagrams IC001 < Audio AMP. > LA4270-E IC501 < Vertical Output > LA78041-E LA4270 Thermal Protection Thermal Shutdown Over Voltage Ripple Filter Pump IC1001 < AV Selector > MM1313BD MTV-V V1-V 34 V COMB V2-V V3-V STV-V V1-Y V2-Y V1-C -6dB...
  • Page 7 IC Block Diagrams IC701 < Triple Video Output Amplifier > TDA6103Q/N3 MIRROR 2 MIRROR 3 FLASH- DIODE Cathode Output 9,8,7 CURRENT bias (3x) SOURCES Non-inverting Inverting 1,2,3 LEVEL- LEVEL- DIFFERENTIAL Input Input SHIFTER 1 SHIFTER 2 STAGE (3x) THERMAL MIRROR 1 PROTECTION Note: One amplifier shown.

  • Page 8: Service Adjustments

    Service Adjustments General This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments. 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.
  • Page 9 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.
  • Page 10 Service Adjustments Item Initial value Range Description G-YA 00,01 G-Y Angle RBGB 00~15 R-Y/B-Y Gain Balance 08→09 ∗ RBAG 00~15 R-Y/B-Y Angle G-YAN 00,01 Difference value of NTSC G-Y Angle RBGBN -8~+7 Difference value of NTSC R-Y/B-Y Gain Balance -2→0 ∗ RBAGN -8~+7 Difference value of NTSC R-Y/B-Y Angle...
  • Page 11 Service Adjustments Item Initial value Range Description VSURF 00, 01 Adjustment of Vertical Sync. Separation Sensitivity (RF) CDMRF 00~07 Vertical Count Down Loop Adjustment (RF) AFCAV 00, 01 Adjustment of AFC Gain & Gate (AV) VSUAV 00, 01 Adjustment of Vertical Sync. Separation Sensitivity (AV) CDMAV 00~07 Vertical Count Down Loop Adjustment (AV)
  • Page 12 Service Adjustments Item Initial value Range Description 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF ROM CORRECTION 00~FF...
  • Page 13 Service Adjustments Important Notice: Do not attempt to adjust service adjustments not listed on below otherwise it may cause loss of performance and for correct operation. Item 01 [RFAGC] AGC NOTE: Do not attempt this adjustment with weak signal. 1. Tune the receiver to most clearest (or strongest) VHF Vertical size station in your area.
  • Page 14 Service Adjustments Items 35-42 GREY SCALE 1. Receive a monochrome circular pattern. 2. Set the brightness and colour to normal, contrast to maximum. 3. Enter to the service mode. 4. Set each value of Item-35 RBIAS, 36 GBIAS, 37 BBIAS mode to 00. Set each value of Item-38 RDRIV, 40 BDRIV mode to 64, 39 GDRIV to 08.
  • Page 15 Service Adjustments Service Adjustment-2 (MTS Adjustment) Following table shows the initial values of MTS Adjustment which have been stored in the CPU ROM. Item Initial value Range INPUT LEVEL 00~63 HIGH SEPARATION 00~63 LOW SEPARATION 00~63 1. Enter the Service Menu While pressing the MENU button on the televi- sion, press the Number Key 3 on the remote control unit.
  • Page 16 Service Adjustments C3411 SOUND LEVEL ADJUSTMENT 1. Receive the channel with audio 1KHz 100% modulation C3404 C3408 signal. C3412 C3411 R3406 2. Connect a DC Volt-Meter to KFF pin-2 ( pin-38 of IC3401) J3404 C3406 R3411 and the ground. C3407 R3402 C3416 3.
  • Page 17 Service Adjustments 6. Select “HI SEPARATION” by pressing the CHANNEL UP/DOWN button on the remote control or TV set. INPUT LEVEL SEPARATION LOW SEPARATION ADJUST : - CHOOSE : EXIT : MENU 7. Adjust the level of 4KHz at KFF pin-1 (pin-39 of IC3401) KFF pin-1 (L) Minimum leakage to become minimum level by pressing the VOLUME (+/-)

  • Page 18: Protection Circuit

    Service Adjustments Service Adjustment-4 FOCUS ADJUSTMENT HIGH VOLTAGE CHECK 1. Receive the monochrome circular pattern. Note: +B (+140V) Voltage and Grayscale Adjustment must be 2. Set the brightness to normal and contrast to maximum. completed before attempting High Voltage Check. 3.

  • Page 19: Cabinet Parts List

    COIL SPRING-D8HA 610 319 2802 DEC IND-C7SA 610 319 9009 BUTTON UNITED-C8AJ 610 319 2727 CABINET FRONT-C8AJ 610 318 1004 BADGE PHILCO-C4BS 610 319 2758 CABINET BACK-C8AA 645 072 9805 ASSY,REMOCON JXMTH 610 297 9879 RC-BATTERY LID-JXMTA 645 004 3925...

  • Page 20: Chassis Electrical Parts List

    C8AJ Chassis Electrical Parts List Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by a mark in this parts list and the circuit diagram show components whose value have special significance to product safety.
  • Page 21 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description 405 015 8724 TR 2SC2812-L6-TB 406 000 6804 TR 2SA1015-GR(SAN) 405 015 8922 TR 2SC2812-L7-TB Q291 405 014 4519 TR 2SC2412K T146 R 405 163 1612 TR 2SC2812N-L6-TB0 405 014 4618 TR 2SC2412K T146 S 405 163 1711 TR 2SC2812N-L7-TB0...
  • Page 22 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description 405 011 8510 TR 2SC1740S-TP-R 405 012 2012 TR 2SC1815-GR-TPE2 405 011 8619 TR 2SC1740S-TP-S 405 012 2111 TR 2SC1815-O—TPE2 405 012 2012 TR 2SC1815-GR-TPE2 405 012 2319 TR 2SC1815-Y-TPE2 405 012 2319 TR 2SC1815-Y-TPE2 405 157 0515...
  • Page 23 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description 405 014 4618 TR 2SC2412K T146 S C011 403 274 9718 POLYESTER 0.22U K 405 015 8724 TR 2SC2812-L6-TB C012 403 274 9718 POLYESTER 0.22U K 405 015 8922 TR 2SC2812-L7-TB C013 404 084 8400...
  • Page 24 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description C233 404 084 8202 ELECT 47U M 403 237 7941 MT-COMPO 0.22U J C243 403 149 9248 CERAMIC 0.01U Z C615 403 324 3314 CERAMIC 220P K C244 404 084 8301 ELECT 470U M C616...
  • Page 25 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description R007 401 015 6534 CARBON 2.2 JA 1/4W R1307 401 105 0732 MT-GLAZE 100K JA 1/16W R008 401 015 6534 CARBON 2.2 JA 1/4W R1308 401 105 0732 MT-GLAZE 100K JA 1/16W R010 401 105 4027...
  • Page 26 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description R423 401 020 2944 CARBON 47K JA 1/4W R626 401 069 4818 OXIDE-MT 68K JA R424 401 024 7024 CARBON 1K JA 1/6W R627 401 025 8228 CARBON 22K JA 1/6W R426 401 105 1630...
  • Page 27 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description R7922 401 105 0534 MT-GLAZE 1K JA 1/16W 610 078 4635 PIPE CORE R7923 401 105 5123 MT-GLAZE 47 JA 1/16W L441 652 000 1343 COIL,LINEARITY R7924 401 105 3228 MT-GLAZE 270 JA 1/16W L442...
  • Page 28 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description D438 407 095 8001 DIODE ERD07-15L D616 407 055 1816 ZENER DIODE RD20EB2 D439 407 006 4128 DIODE ERB44-04V1 D617 407 013 4326 DIODE 1S2076A-TD D442 407 013 4326 DIODE 1S2076A-TD 407 013 7109 DIODE 1S2473...
  • Page 29 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description J203 401 105 7939 MT-GLAZE 0.000 ZA 1/16W C3422 403 062 0524 POLYESTER 0.047U K J226 401 105 7939 MT-GLAZE 0.000 ZA 1/16W 403 179 0919 POLYESTER 0.047U K JC106 401 105 7939 MT-GLAZE...
  • Page 30 C8AJ Ref. No. Part No. Description Ref. No. Part No. Description R702 401 025 1625 CARBON 1.5K JA 1/6W R703 401 025 1625 CARBON 1.5K JA 1/6W R704 401 007 2319 CARBON 100K JA 1/2W R705 401 065 1217 OXIDE-MT 100K JA R706 401 007 2319...
  • Page 31 Mar./’05...
  • Page 32 Rated wattage (1/2W) C: Solid SERVICE PF2975-00 actual chassis and the circuit diagram. 9. Parts specified with "X" are not installed in this model. REF. NO. 10. Parts specified with "J" are just jumper wires.
  • Page 33 Waveforms & Voltages CRT BOARD (Component Location) (On the Main Board) IC701 C711A IC001 (AUDIO AMP.) C711 R715 Pin-1 2.2V 1.8V 12.0V 1.7V 2.2V 12.9V 24.7V R714 10 13.1V C751 K701 IC201 (IF/VIDEO/CHROMA) R712 Pin-1 2.3V 2.3V 2.6V 4.0V 2.9V 2.9V 5.0V 2.3V...