Teac CT-M6840 User manual

SERVICE MANUAL
CTM6840
68CM CTV
Effective: JULY02 CTM6840SERV

Ver1.2 1 December 2001
1

B+ adjustment VCO & AFT
Alignment NICAM Adjustment Electrical properties
checking for
chassis
RF AGC
adjustment
Sub-brightness
Adjustment White balance Adjustment Aging Adjustment of screen voltage
and focus
Sub-color &
Sub-tint
adjustment
Pincushion and
screen width
adjustment
Screen center
& size
adjustment
(PAL)
Screen center
& size
adjustment
(NTSC)
QC checking
 !"#$%!"!#&'''

Enter D-Mode by pressing D-Mode ON/OFF key, and then you can enter the D-mode.

Enter S-Mode by pressing VOLUME DOWN key on the unit until the volume decrease to minimum
level, then press the DISPLAY key on the remote handset (don’t release the volume key) and you can
enter S- mode.
After enter D-mode or S-mode, you can adjust the setting according to the following procedure,
Press “1” to enter the white balance alignment menu,
  
  
  
  
  
  
Press “2” to enter picture geometry alignment menu for PAL system,
  
  
!  " 
!# $% 
 & 
  
   
 
Press “3” to enter picture geometry alignment menu for NTSC system,
  
' # 
! ' #$" 
!#' #$% 
' #& 
' # 
' #  
 

Ver1.2 1 December 2001
2
Press “4” to enter sharpness setting menu,
  
 ( 50% sharpness in 3.58 system (TV))
 ( 50% sharpness in 3.58 system (AV)*
 + 50% sharpness in 4.43 system (TV)*
 + 50% sharpness in 4.43 system (AV)*
 , Maximum sharpness(-
 # Minimum sharpness*

Press “5” to enter sound alignment menu,
  
#!. #!. /
* 0$1-.2 /
) 300$1-.2 /
!- %$4$ (
# %3 '
Press “6” to enter AGC and volume setting,
  
- 3 ))
- HAFC setting.
&&5 6%7 8
&&5 6%7 '
* Volume output level at 1%
) Volume output level at 25%*9
 Volume output level at 50%(*
Press “7” to enter system setting,
  
. System setting'9
.* System setting
.) System setting+
. System setting
.* System setting()
.) System setting-
!# System setting+
Press “8” to enter picture alignment menu 1, 
  
SCNTSub contrast for luminance signal
CNTXMaximum contrast(-
CNTNMinimum contrast9
BRTXMaximum brightness(9
BRTNMinimum brightness*9
COLXMaximum color/-
COLNMinimum color
Press “9” to enter picture alignment menu 2, 
  
CNTC50% contrast)'
BRTC50% brightness(9
COLC50% color+
TNTC50% tint+
COLPColor level for PAL
COLSColor level for SECAM+
BRTSSub brightness for SECAM

Ver1.2 1 December 2001
3
Press “0” to enter OSD setting menu,
  
OSDHorizontal position of OSD:
TXCXOSD intensity when maximum contrast(
RGCNOSD intensity when minimum contrast
TNTXMaximum tint level/-
TNTNMinimum tint level/-


1. Apply 110-240VAC(±5V) to mains power input, and Philips standard testing pattern to RF input.
2. Adjust VR801 in STANDARD mode until voltage at TP2 (B+) is 112V ±0.5V.

1. Apply a 38.9MHz signal to the IF input.
2. Monitor the DC voltage at pin 48 of IC201.
3. Adjust T201 until the voltage at pin 48 of IC201 becomes 4.62 +/- 0.2V (the picture must stable).
4. Enter D-mode and press the AFT (update/BBE) button. It will start Auto AFT Adjustment and the
screen will show “PIFAFT OK” if the process is finished.

1. Apply a 38.9MHz color bar with NICAM signal to the IF input.
2. Monitor the DC voltage at pin 15 of IC1101.
3. Adjust T1101 until the voltage at pin 15 of IC1101 becomes 2.5 +/- 0.1V.
4. Then check the waveform at pin 4 and 6 of P1103 and it must show correct audio signal.
 !"
1. Connect the detector shown below to collector of Q101.
2. Receive a grey scale signal with 70dBV amplitude.
3. Adjust RFAGC item until the output of the detector becomes 0.8Vpp











Collector
of Q101 To CRO

Ver1.2 1 December 2001
4
#$%&'#$% #$%&#() *
1. Enter D-mode, and connect the probe of Oscilloscope to the conjunction between R217 and P201
(B-out).
2. Apply the Grey-scale/Colour-bar (NTSC signal) to the AV input, in STANDARD status.
3. Select CNTC to adjust the sub-contrast, until that the amplitude “A” is 2.5V as shown below.
4. Select COLC to adjust the sub-colour by tuning the amplitude of “a” and “d” to the same.
5. Select TNTC to adjust the sub-tint by tuning the amplitude of “b” and “c” to the same.
6. Apply the Grey-scale/Colour-bar (PAL signal) to the AV input, in STANDARD status.
7. Select COLP to adjust the sub-colour by tuning the amplitude of “a”, “b”, “c” and “d” to the
same.


&'#&#$%$ 
1. Receive a crosshatch pattern.
2. Adjust the “FOCUS” VR on the flyback the make the picture clear.
3. Enter D-mode and press “1--” key and the screen will become a horizontal line. Then adjust the
“SCREEN” VR on the flyback transformer to set the intensity of the line to a minimum visible
level (the line can just be seen).
4. Press “1--” key again and the TV will become full raster.
5. Select BRTC to adjust the sub-brightness, until that the 2 dark bar of 8 level grey scales just can
be seen.

+ $&
1. Receive a black and white pattern at STANDARD status.
2. Use a color analyzer to measure the black side of the screen. By changing the value of BCUT and
GCUT, set the reading of the color analyzer to x=284, y=299.
3. Then measure the white side of the screen. By changing the value of BDRV and GDRV, set the
reading of the color analyzer to x=284, y=299.
4. Repeat step 2&3 until you can get the correct reading for both black and white sides.

( & ( &+ ,
1. Receive a crosshatch pattern.
2. Adjust VR302 until the vertical line become straight.
3. Adjust VR303 for horizontal size.

a
b
c
d

Ver1.2 1 December 2001
5
-( &"()
1. Apply the crosshatch pattern (PAL signal) to the RF input, in STANDARD status.
2. Select HPOS50 to adjust the Horizontal center.
3. Select VPOS50 to adjust the Vertical center.
4. Select HIGH50 to adjust the Vertical amplitude.
5. Select VLIN50 to adjust the vertical linearity.
6. Select VSC50 to adjust the vertical S-correction.
-( &"#
1. Apply the crosshatch pattern (NTSC signal) to the RF input, in STANDARD status.
2. Select HPOS60 to adjust the Horizontal center.
3. Select VPOS60 to adjust the Vertical center.
4. Select HIGH60 to adjust the Vertical amplitude.
5. Select VLIN60 to adjust the vertical linearity.
6. Select VSC60 to adjust the vertical S-correction.
-#.,  
1. Enter D-mode and press key “0”, then choose OSD item and adjust the OSD horizontal position.
2. Enter D-mode and press key “2”, then choose the OSDV50 item and adjust the OSD horizontal
position.
3. Enter D-mode and press key “3”, then choose the OSDV60 item and adjust the OSD horizontal
position.

Ver1.2 1 December 2001
6

VCDM0 (default value: 68)
BIT Item
0 System switch: 0 : normal identify mode 1 : weak signal identify mode
1 White peak suppress: 0: on 1: off
2,3 ABL gain
00: -0.74v 01: -0.64v 10: -0.37v 11: -0.12v
4,5 ABL start point
00: -0.01v 01: -0.11v 10: -0.3v 11: -0.45v
6 CW-SW: TB1238N, pin 29 Fsc CW output 0 : AUTO, 1 : 4.43M
7 In force system mode, the status of color killer when weak signal
0: on 1: off
VCDM1 (default value: 00)
BIT Item
0 Blanking: 0: on 1: off
1,2,3,4,5 V-Mute timing: = 200ms + 8ms Data
6 Base band filter in NTSC system: 0: on, 1: off
7 VMOD
VCDM2 (default value: 40 for 38MHz IF, 30 for 38.9MHz IF)
BIT Item
0 AFT-mute: 0: on 1: off
1 SECAM-ADJ: 0: SECAM correction off 1: SECAM correction on
2 TB1238N_VMOD
3 PIF VCO ADJ 0: follow bit 0 1: manual adjust
6,5,4 IF frequency:
111: 33.9MHz 110: 33.95MHz 101: 34.47MHz 100: 38MHz
011: 38.9MHz 010: 39.5MHz 001: 45.75MHz 000: 58.75MHz
7 No use
MODE0
BIT Item
0 0: normal AV 1: SCART
1 0: English 1: English + Chinese
2 Low Noise Amp. at tuner: 0: off 1: on
3 No use
4, 5, 6,
7 Muting time when power on: 8ms 

Ver1.2 1 December 2001
7
MODE1
BIT Item
0 Logo: 0: disable 1: TCL Logo
1 No. of channel: 0: 49 1: 99
2 No use
3 Menu background 0: disable 1: black background
4 No. of AV 0: 1 1: 2
5 SECAM 0: off 1: on
6 D-mode 0: enable 1: disable
7 No use
MODE2
BIT Item
0 Teletext 0: off 1: on
1 NICAM & IGR 0: off 1: on
2 No use
3 No use
4 BG : 0 : off 1 : on
5 I : 0 : off 1 : on
6 DK : 0 : off 1 : on
7 M : 0 : off 1 : on
OPTION (default value: 04)
BIT Item
0 When blue background off (mute pin of CPU): 0: audio mute on 1: audio mute off
1 When blue background off (external mute pin of CPU):
0: audio mute on 1: audio mute off
2 When change channel: 0: picture mute off 1: picture mute on
3 Audio demodulation gain setting: 0: 50KHz 1: 25KHz
4 When no signal: 0: search channel by changing VT 1: use memorized VT
5 Power on mode: 0: previous 1: force standby
6 No use
7 No use

PART NUMBER DESCRIPTION QTY LOCATION
08-02916T-CR2 ASS'Y - CRT BD (S.S)
10-1N4148-ABX DIODE 1N4148 (SWITCHING) 3 D501, D502, L501
11-A562TM-0BX TRANSISTOR 2SA562TM-0 1 Q507
11-SC1815-YBX TRANSISTOR 2SC1815Y 3 Q502, Q504, Q506
11-SC4544-0AX TRANSISTOR 2SC4544 (NPN) 3 Q501, Q503, Q505
18-CB0102-JNX RES. C.F. 1K OHM 1/6W +/-5% 1 R515
18-CB0272-JNX RES. C.F. 2.7K OHM 1/6W +/-5% 1 R514
18-CB0561-JNX RES. C.F. 560 OHM 1/6W +/-5% 3 R501, R505, R510
18-CB0681-JNX RES. C.F. 680 OHM 1/6W +/-5% 8 R502, R503, R506, R508, R509, R511, R513, R522
18-FE0272-JNX RES. M.O. 2.7K OHM 1/2W +/-5% 3 R519, R520, R521
18-FG0183-JHX RES. M.O. 18K OHM 2W +/-5% 3 R516, R517, R518
25-BCB471-M1X CAP. ELEC 470 UF 16V +/-20% 1 C506
25-BLA100-M1X CAP. ELEC 10 UF 250V +/-20% 1 C504
26-AMK102-KRX CAP. CER 1000 PF 2KV +/-10% R 1 C505
26-EBP103-ZFX CAP. CER 0.01UF 50V +80-20% F 2 C508, C509
26-EBP391-JCX CAP. CER. 390PF 50V +/-5% CH 2 C501, C502
26-EBP471-JCX CAP. CER 470 PF 50V +/-5% CH 1 C503
34-R220K2-1CX COIL CHOKE 22 UH +/-10% 1 L502
34-R569K2-1CX COIL CHOKE 5.6 UH +/-10% 1 L503
35-237250-00X FERR. BEAD HF70 2 FOR C508 (L505 & L506)
40-02501C-CRG P.C.B. CRT BD 1
41-WJ0050-B00 WIRE BARE JUMPER 5MM 1 L504
41-WJ0060-B00 WIRE BARE JUMPER 6MM 3 R504, R507, R512
41-WJ0075-B00 WIRE BARE JUMPER 7.5MM 1 J503
46-10967W-01X PIN BASE *1 TJC1-1A 1 P501, FOR CRT GROUNDING HOUS.
46-30615H-04X HS 4P24 460 F/W TJC3-4Y/SCN-4 1 P502, FOR M. BD P421
46-37030H-05X HS 5P 2468#24 450 TJC3-5Y/SCN 1 P503, FOR M. BD P201
47-265540-0U7 SOCKET CRT GZS10-2-4 (C.B.) 1 S501
02-GND029-XX0 ASS'Y-CRT GND WIRE & HOUS.(29) 1
36-294960-017 DEGAUSSING XC-74A-3100-TCL 29" 1
42-61308F-XX2 SPEAKER 8 OHM 8W 2 SP601, SP602
44-29OFLS-SJ2A CRT A68QBT892X50 (AUST) 1 CRT01
46-26514H-04X HS 4P A/B 500/13 RBGW TJC1-4Y 1 P411H, FOR D.Y COIL
46-27580H-02X HS 2P22 600/7 F/W TJC3-2Y 1 P602H, FOR M.BD P602
46-27580H-02X HS 2P22 600/7 F/W TJC3-2Y 1 P601H, FOR M.BD P601
54-113971-0UE PVC TUBE #6 L=160MM 2 FOR SPEAKER CONNECTORS
54-114000-00X FELT TAPE 150X19MM 4 FOR (F.CAB) SPEAKER
54-205140-000 SPACER CRT MOUNTING T=2MM 4 MTG CRT TO F.CAB
54-314740-0X0 CRT FIBRE SHEET T=0.8MM 4 MTG CRT TO F.CAB
55-2906FC-0CN FRONT CABINET 1
56-2906FB-0HA PUSH BUTTON 1
56-2906LE-0HC LENS 1
56-2906PK-0HA POWER KNOB 1
59-130460-00X RUBBER PAD (25MMX7MM) 6
59-312160-000 SPONGE CUSHION 8 MTG SPK. TO F.CAB
62-216340-0UA HOLDER POWER CORD 1
62-269940-0HA POWER SW. ADAPTER 1
62-357060-0UN SUPPORT POST 2
63-B40150-AB3 S/T SCREW B 4 X 15 AB (BLACK) 4 MTG SUPPORT POST TO F. CAB
63-H60250-AB4 S/T SCREW H 6 X 25 AB 4 MTG CRT TO F. CAB
63-W30100-AB4 S/T SCREW W 3 X 10 AB 3 MTG PUSH BUTTON & FRONT CAB.
63-W30100-AB4 S/T SCREW W 3 X 10 AB 1 MTG LENS & FRONT CAB.
63-W30140-HS4 S/T SCREW W 3 X 14 HS 8 MTG SPK. TO F. CAB
65-A60180-20E EXT. TOOTH WASHTER 6 X 18 X 2 4 MTG CRT TO F. CAB
67-216790-0E0 SPRING CRT 6MMX50MMX0.6MM 2
67-250450-0E0 SPRING KNOB 1
08-HS46F0-M13F ASS'Y - IR HANDSET "BG"
10-1N4148-ABX DIODE 1N4148 (SWITCHING) 5 D1502, D1503, D1504, D1505, D1507
11-0BC337-0BX TRANSISTOR BC337-40 (NPN) 1 Q1501
13-9028F0-23P IC TC9028-023 (IR TRANS.) 1 IC1501
14-IRE05B-XX0 INFARED EMITTING DIODE 1 D1501
18-CB0229-JNX RES. C.F. 2.2 OHM 1/6W +/-5% 1 R1502
18-CB0682-JNX RES. C.F. 6.8K OHM 1/6W +/-5% 1 R1501
25-HBB470-M1X CAP. ELEC 47UF 10V +/-20% 1 C1503
26-EBP101-JCX CAP. CER 100 PF 50V +/-5% CH 2 C1501, C1502
40-2909NT-RMB P.C.B. REMOTE HANDSET 1
45-COS455-KY0 CER RESONATOR 455 KHZ 1 X1501
49-HS46F0-00X RUBBER PAD KEYS 1
Page 1 of 7 CTM6840

PART NUMBER DESCRIPTION QTY LOCATION
55-HS46FB-0HA CASE LOWER - REMOTE HANDSET 1
55-HS46FD-0HA DOOR BATT. - REMOTE HANDSET 1
55-HS46FT-0HA CASE UPPER - REMOTE HANDSET 1
58-HS46F2-7UI INLAY IR TRANSM.BD (B/G) 1
63-B26060-BT2 S/T SCREW B 2.6 X 6 BT 1
67-26968X-0E2 BATT. TERMINAL (+/-) 1
67-310280-0E2 SPRING - BATTERY (-) 1
67-310290-0E2 SPRING - BATTERY (+) 1
74-009022-60C POLYBAG HANDSET (9CMX22CM) 1
08-29064T-MAN ASS'Y - MAIN BD
02-IRR001-XX0 IR RECEIVER MODULE 1 IR001
07-389VI5-NX4 TUNER UV1355-BK2(BG/HB/IEC/5V) 1 TU101
10-0BY228-F0X DIODE BY228 (FAST RECTIFIER) 1 D411
10-1N4001-EBX DIODE 1N4001 (RECTIFIER) 1 D301
10-1N4148-ABX DIODE 1N4148 (SWITCHING) 13 D041, D042, D043, D044, D211, D212, D213, D221,
D223, D280, D632, D711, D721
10-55C12V-DBX DIODE ZENER 12V 1/2W +/-5% 2 D731, D732
10-55C4V7-DBX DIODE ZENER 4.7V 1/2W +/-5% 1 D222
10-55C5V1-DBX DIODE ZENER 5V1 1/2W +/-5% 2 D061, D101
10-55C8V2-DBX DIODE ZENER 8V2 1/2W +/-5% 1 D471
10-CW574C-DJX DIODE CW574CS 1 D111
10-TFR104-FBX DIODE TFR104 (FAST RECOVERY) 4 D412, D421, D431, D441
11-0BC337-0BX TRANSISTOR BC337-40 (NPN) 1 Q062
11-2N3904-0BX TRANSISTOR 2N3904 (NPN) 1 Q091
11-DD1556-0AX TRANSISTOR 3DD1556 (HORIZ) 1 Q412
11-SA1015-YBX TRANSISTOR 2SA1015Y 6 Q061, Q211, Q241, Q633, Q721, Q934
11-SC1815-YBX TRANSISTOR 2SC1815Y 26 Q001, Q002, Q031, Q032, Q051, Q201, Q251, Q252,
Q261, Q451, Q631, Q711, Q911, Q912, Q913, Q921,
Q922, Q923, Q931, Q932, Q933, Q963, Q964, Q971,
Q981, Q991
11-SC3779-DBX TRANSISTOR 2SC3779D (RF AMPL) 1 Q121
11-SC4544-0AX TRANSISTOR 2SC4544 (NPN) 1 Q401
11-SD1499-QAX TRANSISTOR 2SD1499Q (POWER) 1 Q722
11-SK2541-0BX TRANSISTOR 2SK2541 (N-CHANNEL) 2 Q052, Q212
13-000040-52P IC 4052 2 IC961, IC962
13-00M24C-08P IC M24C08 EEPROM 8K 1 IC002
13-00TA84-27P IC TA8427K 1 IC301
13-0TDA26-16S IC TDA2616 (AUDIO O/P) 1 IC601
13-TA1216-ANP IC TA1216AN 1 IC651
13-TB1240-ANP IC TB1240AN 1 IC201
13-TCLM13-V1P IC TCLM13V1 3CD4 (CPU) 1 IC001
14-LED05R-XX0 LED HFR105 (5MM) 1 D031
18-CB0101-JNX RES. C.F. 100 OHM 1/6W +/-5% 13 R003, R006, R007, R009, R015, R016, R065, R073,
R075, R241, R253, R651, R652
18-CB0102-JNX RES. C.F. 1K OHM 1/6W +/-5% 27 R033, R062, R067, R071, R091, R124, R200, R220,
R243, R269, R271, R301, R304, R451, R911, R912,
R921, R922, R936, R938, R939, R945, R946, R947,
R948, R966, R968
18-CB0103-JNX RES. C.F. 10K OHM 1/6W +/-5% 21 R005, R012A, R017, R029, R031, R051, R054, R055,
R061, R101, R102, R225, R237, R633, R716, R722,
R757, R960, R961, R962, R989
18-CB0104-JNX RES. C.F. 100K OHM 1/6W +/-5% 15 R053, R056, R205, R206, R273, R274, R917, R918,
R919, R926, R927, R928, R929, R973, R983
18-CB0106-JNX RES. C.F. 10M OHM 1/6W +/-5% 1 R116
18-CB0123-JNX RES. C.F. 12K OHM 1/6W +/-5% 2 R244, R951
18-CB0124-JNX RES. C.F. 120K OHM 1/6W +/-5% 1 R287
18-CB0151-JNX RES. C.F. 150 OHM 1/6W +/-5% 4 R127, R934, R935, R994
18-CB0152-JNX RES. C.F. 1.5K OHM 1/6W +/-5% 6 R023, R063, R204, R212, R213, R214
18-CB0153-JNX RES. C.F. 15K OHM 1/6W +/-5% 9 R027, R057, R072, R112, R113, R288, R452, R632A,
R987
18-CB0181-JNX RES. C.F. 180 OHM 1/6W +/-5% 1 R123
18-CB0182-JNX RES. C.F. 1.8K OHM 1/6W +/-5% 2 R024, R715
18-CB0201-JNX RES. C.F. 200 OHM 1/6W +/-5% 1 R993
18-CB0221-JNX RES. C.F. 220 OHM 1/6W +/-5% 9 R012, R203, R215, R216, R217, R255, R261, R264,
R401
18-CB0222-JNX RES. C.F. 2.2K OHM 1/6W +/-5% 18 D215, D631, R036, R041, R042, R043, R044, R202,
R218, R603, R604, R713, R914, R924, R972, R982,
R988, R991
Page 2 of 7 CTM6840