NEC PF-68T31 Service Manual
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NEC PF-68T31 Service Manual

NEC PF-68T31 Service Manual

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S
S E
S
CONTENTS
SPECIFICATIONS ................................................................................ 2
SAFETY PRECAUTIONS ....................................................................... 3
SERVICE ADJUSTMENTS ..................................................................... 7
PARTS LIST ....................................................................................... 19
STANDARD CIRCUIT DIAGRAM
E
R
V
I
C
E R
R V
V I
I C
C E

COLOUR TELEVISION

PF-68T31
PF-68V21
E
M
A
N
E M
M A
A N
N U
U
A
L
U A
A L
L
TV/AV
P+
V-
MENU
V+
CALL
P-
SLEEP
LOCK
QV
1
2
3
SCAN
4
5
6
ZOOM
7
8
9
|
0
- / --
| ♪|
♪
RE-001
|

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Summary of Contents for NEC PF-68T31

  • Page 1: Colour Television

    COLOUR TELEVISION PF-68T31 PF-68V21 TV/AV MENU CALL SLEEP LOCK SCAN ZOOM - / -- | ♪| ♪ RE-001 CONTENTS SPECIFICATIONS …………………………………………………………………….. 2 SAFETY PRECAUTIONS …………………………………………………………….. 3 SERVICE ADJUSTMENTS …………………………………………………………… 7 PARTS LIST …………………………………………………………………………… 19 STANDARD CIRCUIT DIAGRAM...

  • Page 2: Specifications

    8 W + 8 W Input Video 1 Vpp, 75 Ohm, RCA x 2 S-Video Input Y, C Components Input Y, Cb, Cr (PF-68T31) Audio 500 mVrms (-4dBs), High impedance, RCA x 4 Output Video 1 Vpp, 75 Ohm, RCA x1...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS The design of this product contains special hardware, many Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the After re-assembling the product, always perform an isolation original design unless authorized in writing by the check on the exposed metal parts of the cabinet (antenna manufacturer.

  • Page 4: Exploded View

    EXPLODED VIEW PF-68T31/PF-68V21 FRONT CABINET SPEAKER & SPEAKER BOX CRT PWB CONTROL PWB TELETEXT PWB (PF-68T31) IR/LED PWB STEREO PWB PF-68T31 REAR TERMINAL BOARD POWER PWB MAIN PWB REAR CABINET AC POWER CORD...

  • Page 5: Replacement Of Memory Ic

    2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and sharp as possible. STEREO ADJUSTMENT (PF-68T31) 1. Receive A2 stereo signal. 2. Adjust L3101 to get the voltage at TP1 (N3101 Pin #3) as 2.5V ±0.1V 3.
  • Page 6 And press following key, each function will be available. Remote Hand Unit keys [M1] [M2] [M3] [M4] [M5] [M6] [M7] [M0] [M4] menu MENU4 Geometrical adjustment Receive PAL standard Complete pattern signal. Adjustment steps： a) Adjust V. SLOPE, to the center horizontal line just appeare from half bottom shadow. b) Adjust V-SHIFT, the center horizontal line correspond to CRT vertical center.

  • Page 7: Default Settings

    0 → 1 Shipping RF AGC Delay 0 → 63 Y-Delay 0 → 15 Sound Volume 0 → 63 46 (PF-68V21) 47 (PF-68T31 Sub-Sharpness 0 → 63 Sub-Colour 0 → 63 38.9 IF Freq. 0 → 5 4 (PF-68V21) AV Mode 5 (PF-68T31) 0 →...

  • Page 8: Ics Functional Description

    NTSC H-SHIFT 0 → 63 H-AMPL 0 → 63 H-PARABORA 0 → 63 CORNER 0 → 63 TRAPEZ 0 → 63 OSD-H 0 → 29 OSD-V 0 → 29 V. AMPL1 0 → 38 V. AMPL2 0 → 38 ICs functional description 3.1 N701 KS88P8432N-XXX function:Microcomputer NAME...
  • Page 9 N301 TDA8843 Function: I C bus controled PAL/NTSC one chip processor Symbol Function Symbol Function SIF IN B-Y OUT EXT AUDIO IN R-Y OUT B-Y IN R-Y IN PLL LOOP FILT CHROMA VIDEO OUT X’tal 3.58 X’tal 4.43 COLOR PLL BANDGAP +B SUPPLY S Video C IN...
  • Page 10 N801 TDA8354Q Function : vertical output Symbol Function description Symbol Function description Vo(guard) Guard output voltage GNDA Ground A Vi(M) Input measuring resistor Vo(A) Output voltage A Vi(con) Input conversion resistor Vp(A) Supply voltage A Vp(B) Supply voltage B Ii(neg) Input power stage(negative);...
  • Page 11 . Wave forms 4.2Vpp 4.6Vpp 1.2Vpp 2.2Vpp 1Vpp N701 PIN26 N701 PIN27 N301 PIN13 N301 PIN38 N301 PIN17 2.5Vpp 2.5Vpp 0.6Vpp 5Vpp 2.5Vpp N301 PIN19 N301 PIN20 N301 PIN40 N301 PIN41 N301 PIN21 1Vpp 1.3Vpp 2.7Vpp 1000Vpp V902 B N301 PIN47 N301 PIN15 V902 C 95Vpp...
  • Page 12 N802 TDA2009A 11.4 20.1 11.4 0.7 12.6 N503 TDA9860 Transistors voltages V201 V301 V302 V303 V304 V480 V560 V561 V611 V612 V615 V651 V681 V702 36.8 V703 V704 V705 V706 V707 V801 V802 V804 V806 8.16 8.22 20.1...
  • Page 13 V901 V902 V905 44.1 -0.1 128.6 16.0 V906 V908 *********************** Special Function ************************************ Special Setup for limited purpose. This TV has special setup for TV locking function. From normal operation select “CHILD LOCK” and… Receiving [LOCK] key command, CHILD-LOCK menu CHILD LOCK will be appeared.
  • Page 14 VOLUME LIMIT Maximum Volume control value by customer would be limited with this figure. AV LOCK If this item were set to “ON”, after exit from this LOCK mode; Only with AV input are available to use. RF (Tuner) input function will be disabled. PANNEL LOCK If this item were set to “ON”;...

  • Page 15: Purity Adjustment

    PURITY / CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT WEDGE Demagnetize CRT with the demagnetizer. DEFLECTION YOKE Loosen the retainer screw of the deflection yoke. Remove the wedges. Input a green raster signal from the signal generator, and turn the screen to green raster. Move the deflection yoke backward.
  • Page 16 STATIC CONVERGENCE ADJUSTMENT 1. Input a crosshatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig. 1) and turn them to magenta (red/blue). (FRONT VIEW) 3. Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.

  • Page 17: Parts List

    PARTS LIST CAUTION The parts identified by the symbol are important for the safety. Whenever replacing these parts, be sure to use specified ones to secure the safety. The parts not indicated in this Parts List and those which are filled with lines ------ in the Part No. columns will not be supplied.
  • Page 18 EXPLODED PARTS LIST ⑥ ①  ② ⑮ ⑰ ⑱ ④⑤ ⑳ ⑧ ① ⑫⑬ ② ⑨ ⑦...
  • Page 19 Ref. No. Part Name. Part No. Model Q’ty SPEAKER BOX RSR7.013.0136 SPEAKER BOX BRACKET RSR8.078.0331 IRON BRACKET FOR CRT RSR8.038.0233 DAMPER GEAR DP-1 DAMPER GEAR BRACKET RSR8.078.0161 FRONT CABINIT RSR8.074.0288 BACK CABINIT RSR8.074.0297 BACK TERMINAL BOARD E/RSR8.078.007 MAIN PWB FRAME RSAG8.078.116 POWER SWITCH KNOB RSR8.337.0309...
  • Page 20 CCF470J1CA-FC C 3113 50V 0.01u CKF103Z1FA-FC LIST C 3114 50v 2.2u CEF2R2MYACANP C 3115 50v 2.2u CEF2R2MYACANP Model C: Common usage T31: PF-68T31 V21: PF-68V21 C 3116 50V 1000P CKF102K1BA-FC C 3117 50V 1000P CKF102K1BA-FC Symbol Name Part No Model...
  • Page 21 C 422 100V 0.022u CFG223J1-H-NW C 656 160V 470u CEH471M3AEBNK C 484 16v 330u CEC331MYACCNP C 657 25v 1000u CED102M1ACHNP C 485 16v 100u CEC101MYACBNP C 658 25v 2200u CED222M2ACKNP C 501 50v 1.0u CEF1R0MYACANP C 659 16v 470u CEC471MYACCNP C 503 50v 0.47u CEFR47MYACANP...
  • Page 22 C 888 63V 0.1u CAY104K1-H-FC F 601 FUSE 4A 250V FBA4004S02--W C 889 25v 1000u CED102M1ACHNP F601A FUSE HOLDER MB0X0011---G8 C 890 25v 1000u CED102M1ACHNP F601B FUSE HOLDER MB0X0011---G8 Ferrite C 891 100V 0.012u CFG123J1-H-NW FB652A LEF001-----NJ Bead(5*10*1.8) C 892 100V 0.012u CFG123J1-H-NW Ferrite...
  • Page 23 SOCKET 2.5mm R 3117 1/6W 5.6K RDB562J-NAATD GANVL007----- R 3118 1/6W 4.7K RDB472J-NAATD PR 602 2S SOCKET GAAV2001----C R 3119 1/6W 100 RDB101J-NAATD PS 601 Positive Thermister DH1120M001-NC R 3120 1/6W 100 RDB101J-NAATD 2S SOCKET GADV2001----C R 3121 1/6W 3.3K RDB332J-NAATD R 1101 1/6W 27K...
  • Page 24 R 508 1/6W 220K RDB224J-NAATD R 625A 2W 56 RSF560J7ACDND R 509 1/6W 1K RDB102J-NAATD R 628 1/2W 12M RCD126K-NACNH R 511 1/6W 100 RDB101J-NAATD R 629 1/2W 12M RCD126K-NACNH R 512 1/6W 100 RDB101J-NAATD R 652 1/4W 100K RDC104J-NABTR R 514 1/6W 1K RDB102J-NAATD...
  • Page 25 SMIT-SS- R 804 1/2W 2.2 RDD2R2J-NACTD RL 601 HAA0004-----G 112DM(27ohm) R 805 1W 220 RSE221J4ACCND IC SOCKET 1.78mm SKN701 GAGBE001----- R 806 1/2W 1.0 RSD1R0J3ASBNM R 807 1/4W 3.3 RDC3R3J-NABTD 3S SOCKET GADV3001----C R 809 1/6W 10K RDB103J-NAATD SN652 HEAT SINK MB1X0114---BF R 810 1/6W 100...
  • Page 26 V 905 IRFS630A QIRFS630A-NN- VD3702 LED (GREEN) DLC45003---NA V 906 KSA1015 G QKSA1015-GNF- VD808A MTZJ18C DZMTZJ18C--TR V 908 PH2369 QPH2369---NN- VR 651 VCAAA202A001B VD 201 1N4148 DR1N4148---TR VR3101 10KB VDAAA103A001F VD 215 1N4148 DR1N4148---TR X 1101 OR.OSC 12M(16P) XX-008-----NJ CR.OSC (4.00M VD 303 MTZJ3.6A DZMTZJ3R6A-TR...

  • Page 27: Packing Parts List

    PACKING ⑥⑦ ③ ⑤⑧ ① ② ④ PACKING PARTS LIST Ref. No. Part No. Part Name Description CATON BOX E/RSR8.865.281 CATON BOX E/RSR8.865.282 FOAM SPACER (TOP) E/RSR8.870.039 FOAM SPACER (BOTTOM) E/RSR8..870.039 USER MANUAL PF-68V21/T31 6 zz030 Remote Handunit(RE-003) BT-0074A---CX 7 zz030 Remote Handunit(RE-002) BT-0075A---CX 8 zz147...

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Pf-68v21

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