Sony TRINITRON KV-T25SN81 User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-T25SN81 RM-870 New Zealand SCC-K37F-A
SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO.
CHASSIS
TRINITRON ® COLOR TV
BG-1S

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KV-T25SN81
RM-870
SPECIFICATIONS
Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G
Color system PAL, PAL 60, NTSC4.43, NTSC3.58(AV IN)
Stereo/Bilingual system NICAM Stereo/Bilingual B/G, A2 Stereo/Bilingual (German) B/G
Teletext Language English, German, Swedish, Italian, French, Spanish
Channel coverage VHF : 1 to 11 / UHF : 21 to 69 / CATV: S01 to S03, S1 to S41
Audio output (speaker) 5W ×2
Inputs Antenna: 75 ohms
VIDEO IN jacks: phono jacks
Video: 1Vp-p, 75 ohms
Audio: 500 mVrms, high impedance
Outputs Headphone jack: minijack
MONITOR OUT jacks: phono jacks
Video: 1Vp-p, 75 ohms
Audio: 500 mVrms
Picture tube 25 in.
Tube size (cm) 64 Measured diagonally
Screen size (cm) 60 Measured diagonally
Dimensions (w/h/d, mm) 613 ×542 ×472
Mass (kg) 32
Design and specifications are subject to change without notice.
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAPTOTHE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODEDVIEWS AND INTHE
PARTS LIST ARE CRITICALTO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.

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KV-T25SN81
RM-870
TABLE OF CONTENTS
SELF DIAGNOSIS FUNCTION ............................... 4
1. GENERAL.................................................................... 5
2. DISASSEMBLY
2-1. Rear Cover Removal............................................ 11
2-2. A Board Removal ................................................ 11
2-3. F1 Board Removal ............................................... 11
2-4. Service Position ................................................... 11
2-5. Replacement of Parts ........................................... 12
2-6. Demagnetization Coil Removal .......................... 12
2-7. Picture Tube Removal.......................................... 13
3. SET-UP ADJUSTMENTS
3-1. Beam Landing...................................................... 14
3-2. Convergence......................................................... 15
3-3. Focus Adjustment ................................................ 17
3-4. G2 (Screen) and White Balance Adjustments..... 17
4. CIRCUIT ADJUSTMENTS
4-1. Adjustments with Commander............................ 18
4-2. Adjustment Method ............................................. 19
4-3. A Board Adjustment after IC003 (Memory)
Replacement......................................................... 22
4-4. Picture Distortion Adjustment ............................. 22
5. DIAGRAMS
5-1. Block Diagram ...................................................... 25
5-2. Circuit Boards Location ....................................... 29
5-3. Schematic Diagrams and Printed Wiring Boards. 29
(1) Schematic Diagram of A Board ........................... 33
(2) Schematic Diagrams of A3, F1 and V1 Boards ... 37
(3) Schematic Diagrams of C and VM Boards .......... 45
5-4. Semiconductors..................................................... 48
6. EXPLODED VIEW
6-1. Chassis .................................................................. 51
7. ELECTRICAL PARTS LIST ................................... 53
Section Title Page Section Title Page

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KV-T25SN81
RM-870 SELF DIAGNOSIS FUNCTION
If no acknowledgement is returned from a device which is turned "ON", the device has a problem.
In this case, one of the LED's responding to the problem device will flicker a defined number of times.
Flickering is operated by lighting the LED's for 60ss each time.
The flickering frequency responding to each failed device is shown below.
All the devices are checked one after another from the left of the table.
If an error is found, the responding LED will start flickering.
So, if more than 1 device have failed, only the one on the left side will flicker.
Device
Flickering
Frequency
NONVOLATILE
MEMORY
1
—
—
Y/C JUNGLE
(IC300)
3
—
—
—
—
TONE
CONTROL
(IC201)
6

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KV-T25SN81
RM-870
2-1. REAR COVER REMOVAL 2-3. F1 BOARD REMOVAL
SECTION 2
DISASSEMBLY
2Two screws
(BVTP 4×16)
3One screw
(BVTP 3×16)
1Two screws
(BVTP 4×16)
2-2. A BOARD REMOVAL 2-4. SERVICE POSITION
Lever
Lever
A board
A board
F1 board

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KV-T25SN81
RM-870
2-5. REPLACEMENT OF PARTS
For replacement of the Multi Button, Power Button and Light Guide, cut the welded portions
from them, exchange with the new parts, and fix them with screws (+BVTP) respectively.
2-5-1. REPLACEMENT OF MULTI BUTTON
2-5-2. REPLACEMENT OF POWER BUTTON AND LIGHT GUIDE
2-6. DEMAGNETIZATION COIL REMOVAL
3Demagnetization coil
4Tension spring
Picture tube
2DGC holder
1DGC band
Remove the claw
Cut
Light guide
Power button
Two screws
(BVTP 3×12)
Two screws
(BVTP 3×12)

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KV-T25SN81
RM-870
2-7. PICTURETUBE REMOVAL
NOTE : The picture tube for this model are upside-down, and the position for the anode-cap
and tension spring are changed accordingly.
2Using a thumb press down then pull up the rubber cap firmly in the direction
indicated by the arrow b.
3When one side of the rubber cap is separated from the anode button, the
anode-cap can be removed by turning up the rubber cap and pulling it up in the
direction of the arrow c.
•HOWTOHANDLE ANANODE-CAP
1Do not damage the surface of anode-caps with sharp shaped objects.
2Do not press the rubber too hard so as not to damage the inside of anode-caps.
A metal fitting called the shatter-hook terminal is built into the rubber.
3Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.
b
b
c
Anode button
•REMOVAL OF ANODE-CAP
NOTE : After removing the anode, short circuit the anode of the picture tube and the
anode cap to the metal chassis, CRT shield or carbon paint on the CRT.
•REMOVING PROCEDURES
1Turn up one side of the rubber cap in the direction indicated by the arrow a.
a
a
2 A board
5 Deflection yoke
Cushion
6 Four screws
(Tapping screws)
1 Anode cap
4 C board
3 F1 board
7 VM board

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KV-T25SN81
RM-870
•The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
•These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switch should be set as follows unless otherwise noted:
PICTURE control........................................................... normal
BRIGHTNESS control................................................... normal
Perform the adjustments in the following order :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
SECTION 3
SET-UP ADJUSTMENTS
................................................................................................................................................................................................................................
Fig. 3-4
Fig. 3-3
GREEN
BLUE RED
Fig. 3-2
}normal
Purity control
Deflection yoke positioning
corrects these areas.
Purity control corrects
this area. Disk magnets or rotatable
disk magnets correct
these areas (a-d).
a
c
b
d
ab
cd
Fig. 3-1
Neck assy
G1 G2 G3
Preparation :
•In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
•Switch on the power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Position neck assy as shown in Figure 3-1.
3. Set the pattern generator raster signal to a green raster.
4. Move the deflection yoke to the rear and adjust with the purity
control so that the green is at the center and the blue and the red
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)
5. Move the deflection yoke forward and adjust so that the entire
screen is green. (See Figure 3-1.)
6. Switch the raster signal to blue, then to red and verify the
condition.
7. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screw.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)

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KV-T25SN81
RM-870
3-2. CONVERGENCE
Preparation :
•Before starting this adjustment, adjust the focus, horizontal size
and vertical size.
•Minimize the brightness setting.
•Provide dot pattern.
(1) Horizontal andVertical Static Convergence
1. (Moving vertically), adjust theV.STAT magnet so that the red,
green and blue dots in the center of the screen are separated
from each other.
2. Adjust the BMC (Hexapole) magnet so that the red, green and
blue dots are aligned in a straight line.
3. Adjust the BMC (Hexapole) magnet so that the red, green and
blue dots are balanced (ie. equal distance) on either side of the
green dot.
4. (Moving horizontally), adjust the H.STAT VR magnet so that
the red, green and blue dots converge on top of each other in
the center of the screen.
•The respective dot positions resulting from moving each magnet
interact, so be sure to perform adjustment while tracking.
Use the V. STAT magnet to adjust the red, green and blue dots
so they coincide at the center of screen (by moving the dots in
the horizontal direction).
BMC (Hexapole)
V.STAT
Purity
•Operation of the V.STAT magnet.
If the V-STAT magnet is moved in the direction of the aand
barrows, the red, green and blue dots move as shown below.
B
R
B
R
ab
bb
a
b
a
b
a
R
G
B
b
B
G
R
b
ba
a
1
2
3
GG
B G R
R G B
•Operation of BMC (Hexapole) Magnet.
To align or balance the red, green and blue dots, adjust the BMC
(Hexapole) magnet as shown below.
RG B RGB R GB
RGB RGB
RGB
R G B
G
R
B
Center dot
V.STAT Magnet
C board RV 701
SCREEN (G2)

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KV-T25SN81
RM-870
3. Move the deflection yoke as shown in the figure below and
optimize the convergence.
4. Tighten the deflection yoke screws.
5. Install the deflection yoke spacer.
(2) Dynamic Convergence Adjustment
Preparation :
•Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence.
1. Slightly loosen the deflection yoke screws.
2. Remove the deflection yoke spacer.
R
G
B
RGB
RGBR
G
B
RGBRGB
RGB RGB
R
G
BRGBR
G
B
RGB
(3) Screen-corner Convergence
a-d : screen-corner
misconvergence
ba
cd
Fix a Permalloy assy
corresponding to the
misconverged areas
Permalloy assembly
a
b
c
d

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KV-T25SN81
RM-870
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
a. AN ITEM OF ADJUSTMENT
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press POWER button on the
commander) and then press POWER button again, hereupon it
becomes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1(UP) and 4(DOWN) to select an item of
adjustments.
3) Press MUTING button and it will indicate WRITE on screen.
4) Press -button to write into memory.
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
Item
number Note
Adjustment
item Initial DATA
09 RDR 25 WHITE POINT R
0A GDR 20 WHITE POINT G
0B BDR 20 WHITE POINT B
SERVICE
MUTING
1 F
DATA
RDR
Adjustment Item
09
Item number
WRITE1 FRDR09
0
Executes the writing
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT (RV701)
1) Set the PICTURE and BRIGHTNESS to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C board cathode to the oscilloscope.
4) Adjust G2 (RV701) volume to the value below.
2. WHITE BALANCE ADJUSTMENTS
1) Set to Service Mode.
2) Input an entire white signal.
3) Set the PICTURE to maximum.
4) Select RDR(09) with 1and 4, and then set the level to 25
with 3and 6.
5) Select GDR(0A) and BDR(0B) with 1and 4and adjust
the level with 3and 6for the best white balance.
6) Write into the memory by pressing MUTING →then -.
0 V
Focus
175 V DC

– 18 –
KV-T25SN81
RM-870
Entering service mode
With the unit on standby
↓
DISPLAY
↓
5
↓
VOL (+)
↓
POWER
The operation sequence puts the unit into service mode.
SECTION 4
CIRCUIT ADJUSTMENTS
4-1. ADJUSTMENTS WITH COMMANDER
Service adjustments are made with the RM-870 that comes with
this unit. [1], [4] Raise/lower the service item number
[3], [6] Raise/lower the data
[MUTING] Writes
[0] Executes the writing
[7], [0] All the data becomes the values in memory
[8], [0] All user control goes to the standard state
[5], [0] Service data initialization (Be sure not to use
usually.)
[2], [0] Write 50Hz adjustment data to 60Hz, or vice
versa.
The screen display is :
[1], [4] Select the adjustment item.
↓
[3], [6] Raise/lower the data.
↓
[MUTING] Writes
↓
[0] Executes the writing.
MUTING
TEXT VIDEO
HOLD TV
TEXT CLR +SELECT
PIC MODE
A/B
ENLARGE
WAKE UP
INDEX
VOL PROGR
SLEEP
+
1 2 3
4 5 6
7 8 9
0
DISPLAY
REVEAL POWER
+
÷
SERVICE Mode08
DATA
RGB
50 Depends on the signals
PAL, SECAM : 50
NTSC : 60
10000000
Adjustment item
00
Item number
RM-870

– 19 –
KV-T25SN81
RM-870
4-2. ADJUSTMENT METHOD
Item Number 08
This explanation uses V-SHIFT as an example.
1. Select 08V-SHIFT with the [1] and [4] buttons.
2. Raise/lower the data with the [3] and [6] buttons.
3. Select the optimum state. (The standard is 0F for PAL
reception.)
4. Write with the [MUTING] button.
5. Execute the writing with the [0] button. (The WRITE
display will be changed to green SERVICE.)
Use the same method for Items Number 00-4B. Use [1] and [4] to
select the adjustment item, use [3] and [6] to adjust, write with
[MUTING], then execute the write with [0].
WRITE
WRITE
GREEN0CVSF08
SERVICE
50
50
50
GREEN0CVSF08
Adjust with the [3] and [6] buttons.
Written with the [MUTING].
Write executed with [0].
GREEN
The WRITE display
will be changed back to
SERVICE.
0CVSF08

– 20 –
KV-T25SN81
RM-870
Adjustment Item Table
Data
range Initial data Standard data Note Device
Item Adjustment
number Item
00 HSF 00–3F 24 H SHIFT TDA8375A
01 HSZ 00–3F 23 H SIZE TDA8375A
02 PAP 00–3F 21 PINAMPLITUDE TDA8375A
03 CNP 00–3F 29 CORNER PIN TDA8375A
04 TLT 00–3F 20 TILT TDA8375A
05 VSL 00–3F 20 V SLOPE TDA8375A
06 VAP 00–3F 1D V AMPLITUDE TDA8375A
07 SCR 00–3F 20 S CORRECTION TDA8375A
08 VSF 00–3F 20 V SHIFT TDA8375A
09 RDR 00–3F 25 WHITE POINT R TDA8375A
0A GDR 00–3F 20 WHITE POINT G TDA8375A
0B BDR 00–3F 20 WHITE POINT B TDA8375A
0C FO 00–02 00 TV/VIDEO/TEXT PHI-1 TIME CONSTANT TDA8375A
0D AGC 00–3F 30 AGC TAKE OVER TDA8375A
0E VSW 00–01 00 VIDEO MUTE TDA8375A
0F FOR 00–03 00 FORCED FIELD FREQ. TDA8375A
10 DL 00–01 00 INTERLACE TDA8375A
11 POC 00–01 00 SYNCHRO MODE FIX TDA8375A
12 VID 00–01 00 VIDEO IDENT MODE TDA8375A
13 HCO 00–01 00 EHT TRACKING MODE TDA8375A
14 EVG 00–01 00 ENABLE V GUARD TDA8375A
15 SBL 00–01 00 SERVICE BLANKING TDA8375A
16 PRD 00–01 00 OVER-VOLTAGE INPUT TDA8375A
17 COR 00–01 00 NOISE CORING PEAK TDA8375A
18 PMX 00–3F 27 PICTURE MAX DATA TDA8375A
19 PMI 00-3F 05 PICTURE MIN DATA TDA8375A
1A SBR 00–7F 4B SUB-BRIGHTNESS TDA8375A
1B SHU 00–0F 07 SUB-HUE TDA8375A
1C SSH 00–03 01 TV/VIDEO SUB-SHARPNESS TDA8375A
1D SC1 00–3F 1F SUB-COLOR LOWER TDA8375A
1E SC2 00–3F 0B SUB-COLOR HIGHER TDA8375A
1F AIP 00–7F 3F ADJUSTMENT IF PLL TDA8375A
20 VZM 00–3F 19 VERTICAL ZOOM TDA8375A
21 FAW 00–FF 08 NICAM FAW THRESH MSP3410
22 CTM 00–FF 08 NICAM ERROR BIT (MONO) MSP3410
23 CTN 00–FF 50 NICAM ERROR BIT (NICAM) MSP3410
24 WCD 00–FF 0A W. G. CHANGE DATA MSP3410
25 WST 00–FF 15 W. G. STEREO CUT POINT MSP3410
26 WTM 00–FF 50 W. G. TIMER CHANGE MSP3410
27 WBT 00–FF EA W. G. BILINGUAL MSP3410
28 ACG 00–01 01 AGCAUTO/CONSTANT MSP3410
29 CDB 00–3F 28 AGC GAIN CONSTANT MSP3410
2A FGP 00–7F 24 FM (BG, I, DK) PRESCALE MSP3410
2B FMP 00–7F 40 FM (M) PRESCALE MSP3410
2C WGP 00–7F 3C W. G. PRESCALE MSP3410
2D NIP 00–7F 7F NICAM PLESCALE MSP3410
2E CRM 00–01 00 CARRIOR MUTE MSP3410
2F CML 00–03 00 AUDIO CLOCK OUT MSP3410
31 WAC 00–01 01 W.G.AGREEMENTCOUNT MSP3410
32 DLY 00–FF 30 STEREO SEARCH DELAY MSP3410
33 DLG 00–FF 10 INTERVAL OF ID CHECK MSP3410
34 TXP 00–0F 09 TEXT PICTURE SAA5281
35 MXP 00–0F 0D
TEXT MIX MODE PICTURE SAA5281

– 21 –
KV-T25SN81
RM-870
Adjustment Item Table
Data
range Initial data Standard data Note Device
Item Adjustment
number Item
36 BKP 00–3F 00 BLK OFF PICTURE
µ . CON
37 HBL 00–3F 25 H BLK LEFT WIDTH
µ . CON
38 HBR 00–3F 20 H BLK RIGHT WIDTH
µ . CON
39 VBH 00–7F 00 V BLK HIGHT WIDTH
µ . CON
3A VBL 00–FF FF V BLK LOW WIDTH
µ . CON
3B ODL 00–FF 10 POWER ON DELAY
µ . CON
3C OFR 00–0F 00 STBY nON RGB OUT
µ . CON
3D OFM 00–0F 00 MAIN POWER RGB OUT
µ . CON
3E OSH 00–3F 0A OSD POSITION H
µ . CON
3F DKS 00–01 00 D/K NICAM
µ . CON
40 MUT 00–01 01 NO SYNC. MUTE
µ . CON
41 DWZ 00–01 00 DISEBLE WIDEZOOM
µ . CON
42 ABL 00–01 01 BRIGHT ABL
µ . CON
43 DTV 00–01 00 DISABLE TV SYSTEM KEY
µ . CON
44 SCM 00–01 00 SECAM TRAPACTIVE
µ . CON
45 ROC 00–0F 07 ROTATION CENTER
µ . CON
46 ROS 00–07 03 ROTATION STEP WIDTH
µ . CON
47 DVM 00–01 00 DISABLE VM MUTE
µ . CON
48 FBT 00–01 01 C/M FBT LAYER SHORT
µ . CON
49 OP0 00–FF 40 Refer to table below OPTION 0
µ . CON
4A OP1 00–FF 07 Refer to table below OPTION 1
µ . CON
4B OP2 00–FF 00 Refer to table below OPTION 2
µ . CON
NOTE
•Standard Data: Those are the standard data values written on the microprocessor. Therefore, the data values of the
modes are stored respectively in the memory.
In case of a device replacement, adjustment by rewriting the data value is necessary for some items.
•50 ...................... 50 Hz data
•60 ...................... 60 Hz data
•Standard data listed on the adjustment item table are reference values, therefore it is different for every model.
ITEM INFORMATION
•10. DL: TV/MIX Mode 0=Interlace 1=Non interlace, TEXT Mode 0=Non interlace 1=Interlace
•42.ABL: Bright ABL ON/OFF ON=1 OFF=0
•49. OP0, • 4A. OP1, • 4B. OP2 :
Input data are different according to models.
AV INPUT : 00 →NO MODEL, 01 →MONO, CXA1315, 10/11 →STEREO, TDA8424
TV System : 00 →Multi model, 01 →B/G, 10 →D/K, I, 11 →B/G, D/K
NTSC, SECAM, Chin
Shrp : Dynamic Mode @ 1 →Sharpness 50%, 0 →Sharpness 70%.
VM Operation : 0 →OFF, 1 →ON
No. 49 OP0 * Input data are different according to models
Item – AV Input Shrp 50 % Remote Preset Auto Program Video Text Reserved
KV-T25SN81 0100 0000
No. 4A OP1
Item – TILT – TV System NTSC 3.58 SECAM Chinese
KV-T25SN81 0000 1101
No. 4B OP2
Item – Sound Mode Child Lock Sound Effer High Dev. 100 Program 4:3 Wide S. Video
KV-T25SN81 0000 0000

– 22 –
KV-T25SN81
RM-870
4-4. PICTURE DISTORTION ADJUSTMENT
Item Number 00 – 08
00 HSF (H SHIFT)
01 HSZ (H SIZE)
02 PAP (PIN AMP)
03 CNP (CORNER PIN)
04 TLT (TILT)
05 VSL (V SLOP)
06 VAP (V ANP)
07 SCR (S CORRECTION)
08 VSF (V SHIFT)
00 HSF (H SHIFT)
01 HSZ (H SIZE)
02 PAP (PIN AMPLITUDE)
03 CNP (CORNER PIN)
04 TLT (TILT)
05 VSL (V SLOPE)
06 VAP (V AMPLITUDE)
07 SCR (S CORRECTION)
08 VSF (V SHIFT)
4-3. A BOARD ADJUSTMENT AFTER IC003
(MEMORY) REPLACEMENT
1. Enter to Service Mode.
2. Press commander buttons [5] and [0] (Data Initialize), and [2]
and [0] (Data Copy) to initialize the data.
3. Call each item number,and check if the respective screen shows
the normal picture.
In case some items are not well-adjusted, give them fine
adjustment.
Write the data per each item number ([MUTING] + [0]).
4. Select item numbers “49” (OP0), “4A” (OP1) and “4B” (OP2)
and respectively set the bit per model with command buttons
[3] and [6].
5. Press commander buttons [8] and[0] (Test Normal) to return to
the data that was set on the shipment from the factory.
(= Cancel Service Mode.)

– 23 –
KV-T25SN81
RM-870
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MEMO
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○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○

– 24 –
KV-T25SN81
RM-870
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
MEMO
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○

KV-T25SN81
RM-870
– 48 – – 49 – – 50 –
KV-T25SN81
RM-870 KV-T25SN81 RM-870
TRANSISTOR
DTA114EKA-T146
DTC114EKA-T146
UN2211
UN2213
UN2216
2SA1037K-T-146-QR
2SA1162-G
2SC1623-L5L6
2SC2712-YG
2SD601A-Q
2SA1091-0
2SA1175-HFE
2SC2410SN
2SC2785-HFE
2SC3209LK
2SC3733
2SD774-34
2SC2611
E
B
C
ECB
ECB
LETTER SIDE
ECB
E
LETTER SIDE
CB
2SC2669-0
2SC4793
2SC4927-01
2SA1837
2SD2394-EF
2SD2394-F
D1G1 S1 NC S2 G2 D2
E
C
B
ECB
BCE
5-4. SEMICONDUCTORS
ERC06-15S
RN4Z
S3L20UF4
LN4SB60
LNK0220022G
DTZ9.1
MA113-(TX)
RD13ES-B2
RD2.2ES-B2
RD3.6ES-B1
RD39ES-B2
RD4.7ES-B2
RD5.1ES-B1
RD5.6ES-B2
1SS119-25
RD9.1ES-L2
DIODE
D1NL20
EL1Z
GP08D
RGP02-17EL-6433
RD3.6M-B2
RD5.6M-B2
DA204K
DAN202K
DAP202K
CATHODE
ANODE
2
2
4
1
3
124
CATHODE
ANODE
CATHODE
ANODE
3
1
2
1
3
2
3
1
2
1
3
2
3
1
2
1
3
2
3
1
2
1
3
2
ERD29-08J
RU4AM-T3
5P-6M
CATHODE
ANODE
CATHODE
ANODE GATE
IC
ST24C08FB6 (8PIN)
CXA1110BS (30PIN)
CXP85224A-072S (64PIN)
P83C654FBP/540 (40PIN)
SAA5281ZP/E (52PIN)
TDA4665T/V5-118 (16PIN)
TDA8375A (56PIN)
TDA8424 (20PIN)
L78LR05D-MA
PC123F2
SBX1981-11
SE135N
STR-S6708N
1TOP VIEW
Dual In-line Package
Pin 6
~ 98
12
43
UPC4558G2 (8PIN)
NJM78L12A
LA7830
TA8223K
UPC574J
Single In -line Package
Pin 6 ~ 98
1TOP VIEW
123
PQ09RE11
NJM2234L
MSP3410D-PP-B4
TA7805S
1
15
ANODE CATHODE
1234
8
1
Quad Flat J-leaded Package
Pin 20 ~ 996
TOP VIEW
1
Zig-zag In -line Package
Pin 6 ~ 99
MARKING SIDE VIEW
1

KV-T25SN81
RM-870 KV-T25SN81 RM-870
3
6
11
7
10
8
912 14 15
18 19
16
17
21
45
22
32 33 35
37
36
34
38
39
40
12
15
6
531
30
r: BVTP3×12 7-685-648-79
p: BVTP4×16 7-685-663-79
r
r
r
20 23 24
25
44
26
28
29
p
4
r
27
13 14
43
13
4
41
42
11
12
46
SECTION 6
EXPLODED VIEW
The components identified by
shading and mark !are critical
for safety.
Replace only with part number
specified.
•Items marked " * " are not stocked since
they are seldom required for routine
service. Some delay should be
anticipated when ordering these items.
– 51 –
NOTE:
•Items with no part number and no
description are not stocked because they
are seldom required for routine service.
•The construction parts of an assembled
part are indicated with a collation number
in the remark column.
6-1. CHASSIS
[: BVTP3 ×12 7-685-648-79
L: BVTP4 ×16 7-685-663-71
8: BVTP3 ×16 7-685-650-79
– 52 –
REF. NO. PART NO. DESCRIPTION REMARK REF. NO. PART NO. DESCRIPTION REMARK
1 4-050-176-31 DOOR, CONTROL
2 4-048-575-01 LABEL, CONTROL
3 4-627-936-01 LOCK, MINIATURE SIDE
4 4-048-540-01 CUSHION, CRT
5 X-4032-786-2 BEZNET ASSY 3, 4, 6-10
6 4-048-691-01 HANDLE
7 4-048-687-01 BUTTON, MULTI
8 4-049-123-01 GUIDE, LIGHT
9 4-048-688-01 BUTTON, POWER
10 4-302-428-03 SCREW (WASHER HEAD) (+P 3X12)
11 4-037-613-01 CUSHION, SP
12 1-504-305-11 SPEAKER (5X12CM)
13 * 4-038-987-11 CUSHION, SPEAKER
14 4-043-388-01 SCREW, STEP TAPPING
15 4-046-765-01 SCREW, TAPPING 7 + CROWNWASHER
16 !8-733-255-05 PICTUTE TUBE (M60KWL70X)
17 !8-451-404-42 DEFLECTION YOKE (Y25GXAS)
18 1-452-762-31 NECKASSEMBLY NA294
19 * A-1342-396-A VM BOARD, MOUNTED
20 * A-1331-743-A C BOARD, MOUNTED
21 4-046-600-11 SPACER, DY
22 * 3-704-372-11 HOLDER, HV CABLE
23 4-369-318-61 SPRING, TENSION
24 !1-403-619-11 COIL, DEMAGNETIZATION
25 4-043-827-11 BAND, DEGAUSSING COIL
26 * 4-042-988-01 HOLDER, DGC
27 4-049-416-01 SHEET, BLIND
28 !X-4032-967-1 COVER ASSY, REAR 27
29 4-049-130-01 CLAMPER, CORD
30 * 4-048-690-01 RAIL (L), GUIDE
31 * 4-048-689-01 RAIL (R), GUIDE
32 * A-1241-190-A F1 BOARD, MOUNTED
33 * 4-049-158-01 BRACKET, F1 PC BOARD
34 * A-1297-523-A A3 BOARD, COMPLETE
35 !8-598-323-50 TUNER, VSS BT-AG401
36 !1-900-212-02 LEAD ASSY, FOCUS
37 !1-453-190-11 TRANSFORMER ASSY, FLYBACK (NX-2743//M3B)
38 * A-1298-964-A A BOARD, COMPLETE
39 !4-389-778-11 HOLDER, AC CORD
40 !1-574-358-12 CORD, POWER (WITH CONNECTOR) 7.5A/250V
41 1-452-032-00 MAGNET,DISC
42 X-4387-214-3 PERMALOY ASSY, CORRECTION
43 4-034-272-01 PLATE, CORRECTION, TLV
4-034-272-41 PLATE, CORRECTION, TLV
44 * 4-045-290-11 CUSHION (50X290), DGC
45 4-049-122-01 RIVET
46 * A-1347-103-A V1 BOARD, COMPLETE
NOTE : The picture tube for this model are upside-down, and the position
for the anode-cap and tension spring are changed accordingly.