Sony KD-27FS170 Service Manual ▷ View online
KD-27FS170/32FS170/36FS170
KD-27FS170/32FS170/36FS170
34
2-4. SCREEN (G2)
1. Input a dot pattern.
2. Set the PICTURE and BRIGHTNESS controls at minimum and
COLOR control at normal.
3. Adjust SBRT, GCUT, BCUT in service mode with an oscilloscope as
shown below so that voltages on the red, green, and blue cathodes
are 170 ± 2VDC.
are 170 ± 2VDC.
Pedestal
170 ± 2VDC
Ground
±
4. Observe the screen and adjust SCREEN (G2) VR in FBT to obtain
the faintly visible background of dot signal.
KD-27FS170/32FS170/36FS170
KD-27FS170/32FS170/36FS170
35
SECTION 3: SAFETY RELATED ADJUSTMENTS
Hold-Down Readjustment
If the setting indicated in Step 2 of Hold-Down Operation Confi rmation
cannot be met, readjustment should be performed by altering the
resistance value of R529, R530, R531 and R577 component marked with
X.
cannot be met, readjustment should be performed by altering the
resistance value of R529, R530, R531 and R577 component marked with
X.
3mA DC range
+
-
+
-
A
+
-
FBT
TP85
T503
FBT
FBT
TP85
R531 R530
DC Power Supply
digital multimeter
ammeter
R529 R577
Figure 1
3-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Always perform the following adjustments when replacing the following
components, which are marked with Y on the schematic diagram on the
A Board:
components, which are marked with Y on the schematic diagram on the
A Board:
A BOARD
IC600, PH602
IC600, PH602
Adjustment (Y)
1. Using a Variac, apply AC input voltage: 130 + 2.0/-0.0 VAC
2. Input a monoscope signal.
3. Set the PICTURE control and the BRIGHT control to
minimum.
4. Confi rm the voltage on A Board between TP23 and ground is less
than 136.5 VDC.
5. If step 4 is not satisfi ed, replace R529, R530, R531 and R577 on A
Board and repeat the above steps.
3-1. X R529, R530, R531, R577
CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
The following adjustments should always be performed when replacing
the following components which are marked with Y on the schematic
diagram:
the following components which are marked with Y on the schematic
diagram:
Preparation Before Confi rmation
1. Using a Variac, apply AC input voltage: 120 +/- 2.0 VAC.
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and BRIGHT controls to
maximum.
4. Confi rm that the voltage of more than 23.0 VDC appears between
TP85 and ground on the A Board.
Hold-Down Operation Confi rmation
1. Connect the current meter between Pin 11 of the FBT (T503) and
the PWB land where Pin 11 would normally attach. (See Figure 1).
2. Input a dot signal and set PICTURE and BRIGHTNESS to
minimum: IABL = 2175 + 100/ -325 µA.
3. Confi rm the voltage of A Board TP91 is 134.6 ± 1.0 VDC.
4. Connect the digital voltmeter and the DC power supply to TP85 and
ground. (See Figure 1).
5. Increase the DC power voltage gradually until the picture blanks
out.
6. Turn DC power source off immediately.
7. Read the digital voltmeter indication:
Standard = 24.78 + 0.0/ - 0.1 VDC.
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 2175 + 100/ -325 µA.
9. Repeat steps 4 to 7.
Y
C507, C511, C513, D519,
D520, D521, IC001, IC501,
IC601, IC602, PH601, R529,
R530, R531, R577, T502,
T503 (FBT), T505
D520, D521, IC001, IC501,
IC601, IC602, PH601, R529,
R530, R531, R577, T502,
T503 (FBT), T505
HV HOLD-DOWN
R529, R530, R531, R577
R529, R530, R531, R577
Part Replaced ( )
Adjustment ( )
KD-27FS170/32FS170/36FS170
KD-27FS170/32FS170/36FS170
36
SECTION 4: CIRCUIT ADJUSTMENTS
Electrical Adjustments by Remote Commander
Use the Remote Commander
(RM-YD006)
to
perform the circuit adjustments in this section.
Test Equipment Required: 1. Pattern generator 2. Frequency counter 3. Digital multimeter 4. Audio oscillator
4-2. ACCESSING THE SERVICE
ADJUSTMENT MODE
1. Standby mode (Power off).
2. Press the following buttons on the remote commander within a
second of each other:
DISPLAY
Channel 5
Sound Volume +
POWER
The screen displays the fi rst service data category item.
Category
Display
Item
Display
Data
Signal
Type
Type
Channel
Type
Type
NTSC
VIDEO1
DEF
M65586MK-056FP
D1.0
HSIZ
1:35 NVM:OK
1. On the Remote Commander press 2 or 5 to select the category.
2. Press
1 or 4 to select the item.
3. Press
3 or 6 to change the data value.
4. Press
MUTING then ENTER to write into memory.
Category
Display
Item
Display
Data
Signal
Type
Type
Channel
Type
Type
NTSC
WRITE
DEF
M65586MK-056FP
D1.0
HSIZ
1:35 NVM:OK
Text
changes to
“WRITE” and
changes
colors from
green to red
changes to
“WRITE” and
changes
colors from
green to red
DISPLAY
(Service Mode)
0
(Remove from
memory)
memory)
POWER
RM-YD006
(Service Mode)
MUTING
(Enter into
memory)
memory)
4
Display previous
Item
Item
1
Display next
Item
Item
2
Display next
Category
Category
4-1. REMOTE ADJUSTMENT BUTTONS AND
INDICATORS
8
(Initialize)
3
Increase
Data value
Data value
6
Decrease
Data value
Data value
5
Display previous
Category
Category
ENTER
(Enter into
memory)
memory)
VOLUME (+)
(Service Mode)
KD-27FS170/32FS170/36FS170
KD-27FS170/32FS170/36FS170
37
Service Adjustment Mode Memory
Use the following procedure when adjusting IDs 0-7 and when replacing
and adjusting IC002.
1. Access
and adjusting IC002.
1. Access
Service
Adjustment
Mode.
2. Press
8 then ENTER on the Remote Commander to initialize.
Category
Display
Item
Display
Data
Signal
Type
Type
Channel
Type
Type
NTSC
RESET
DEF
M65586MK-056FP
D1.0
HSIZ
1:35 NVM:OK
Text
changes to
“RESET”
and changes
colors from
green to red
changes to
“RESET”
and changes
colors from
green to red
The TV powers off after completing the initialization process.
4-3. CONFIRMING SERVICE ADJUSTMENT
CHANGES
1. After completing adjustments, pull out the plug from the AC outlet,
then replace the plug in the AC outlet again.
2. Access
Service
Adjustment
Mode.
3. Using the buttons on the Remote Commander, locate the adjusted
items again to confi rm they were adjusted.
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