— 20 —
KV-27FV15/29FV10/29FV15/29FV15C/29FV15K
A BOARD:
IC355, IC501, D302, D519, D520, D521, C531,
C532, Q301, R356, R359, R361, R387, R529,
R530, R531, R532, R533, R550, T503
G BOARD (KV-27V15):
IC643, R661
GA BOARD (KV-27V15 Excluded):
IC6003, R6088
Step 1
Preparation before Confirmation
Turn the POWER switch ON.
Input a white signal and set the PICTURE and BRIGHT
controls to maximum.
Confirm that, when the set is operating normally, the
voltage at check terminal TP85 is more than 21.0 V DC.
At AC input: 120.0 ± 2.0 VAC
Step 2
Input a white signal and verify that I ABL is within the
specified range:
1730 + -100
µ
A,
+B = 135.0 + 1.5 VDC .
At AC input: 120.0 ± 2.0 VAC
+
I ABL
ABL
T503
FBT
range
-
ammeter
3.0 mA DC
A
Step 3
Record the voltage between TP85 and ground.
Step 4
Using an external DC power supply, apply voltage
between TP85 and ground.
Increase the voltage gradually and confirm that the
holdown works (raster disappears) at lower than the
voltage recorded in Step 3.
Lower than 26.95 + (-0.05) V DC.
At AC input: 120.0 ± 2.0 VAC
SECTION 4
SAFETY RELATED ADJUSTMENTS
Always perform the following adjustments when replacing the
following components marked with
]
on the schematic diagram:
G BOARD (KV-27FV15):
IC643, R661
GA BOARD (KV-27FV15 Excluded):
IC6003, R6088
1)
Using Variac, apply AC input voltage: 130.0 ± 2.0 VAC
2)
Input a monoscope signal.
3)
Set the PICTURE control and the BRIGHT control to
initial reset value.
4a) (KV-27FV15 Only) Confirm the voltage of G Board
CN641 between pin
1
to ground on "G" PWB is less
than 136.5 + 1.0 V DC.
4b) (KV-27FV15 Excluded) Confirm the voltage of GA
Board CN6007, between pin
1
to ground on "GA" PWB
is less than 136.5 + 1.0 V DC.
5a) (KV-27FV15 Only) If step 4a is not satisfied, replace
R661 and repeat the above steps.
5b) (KV-27FV15 Excluded) If step 4b is not satisfied, replace
R6088 and repeat the above steps.
R530, R531 CONFIRMATION METHOD (HOLD-DOWN CONFIRMATION) AND READJUSTMENTS
A BOARD - CONDUCTOR SIDE
Step 5
Confirm that a voltage appears between TP85 and
ground, of more than 21.0 V DC.
At AC input: 120.0 ± 2.0 VAC
Always perform the following adjustments when replacing the following
components marked with a
]
mark on the schematic diagram:
+
-
dejital
multimeter
+
-
A
ammeter
3mA dc range
+
-
dc power supply
11
R530
R531
T503
FBT
TP85
1T40
T503
FBT
TP85
R531
R530
DC Power Supply
digital multimeter
ammeter
3mA DC range
B+ VOLTAGE CONFIRMATION AND ADJUSTMENT
