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SECTION 4
SAFETY RELATED ADJUSTMENTS
R564 CONFIRMATION METHOD
(HV
The following adjustments should always be performed when replacing the following components which are marked with on the schematic diagram:
Part Replaced ( | ) | Adjustment ( ) |
DY, T505, CRT, IC501, C507, | HV | |
C520, C505, C509, C515, T504, | R564 | |
T503, C551, L510, C546, C537, |
| |
C547, D517, D518, D519, R560, |
| |
R561, R562, R563, R565, R566, |
| |
R567, R525 | A Board |
|
IC301 | MA Board |
|
|
|
|
Preparation Before Confirmation
1.Using a Variac, apply AC input voltage: 120 ± 2 VAC.
2.Turn the POWER switch ON.
3.Input a white signal and set the PICTURE and BRIGHTNESS controls to maximum.
4.Confirm that the voltage between C546 (+) or TP503
and ground is more than 21.0 VDC
Hold-Down Operation Confirmation
1.Connect the current meter between Pin 11 of the FBT
(T505) and the PWB land where Pin 11 would normally attach. (See Figure 1 on the next page.)
2.Input a dot signal and set PICTURE and BRIGHTNESS
to minimum: IABL = 1730 ± 100 ∝ A
32FS12/32FS16 ONLY).
3.Confirm the voltage of A Board
4.Connect the digital voltmeter and the DC power supply via diode 1SS119 to C546 (+) and ground. (See Figure 1 on the next page.)
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
8.Input a white signal and set PICTURE and BRIGHTNESS to maximum: IABL = 1730 ± 100 ∝ A
32FS12/32FS16 ONLY).
9.Repeat steps 4 to 7.
Hold-Down Readjustment
If the setting indicated in step 2 of .
T505
FBT
ammeter
3.0 mA DC range
ABL + A -
IABL
4-2. B+ VOLTAGE CONFIRMATION AND ADJUSTMENT
Note: The following adjustments should always be performed when replacing the following components, which are marked with on the schematic diagram on the A Board.
A BOARD: IC601, PH601
1.Using a Variac, apply AC input voltage: 130 +
2.Input a monoscope pattern.
3.Set the PICTURE and BRIGHTNESS controls to minimum.
4.Confirm that the voltage of A Board
5.If step 3 is not satisfied, replace the components listed above, then repeat steps
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