6
32SF670
CIRCUIT PROTECTION
The receiver is protected by a 4.0A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1. Apply 120V AC using a variac transformer for accurate
input voltage.
2. Allow for warm up and adjust all customer controls
for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to TP651-3 (P651, 3Pin)
and make sure that the voltmeter reads 13.65 ±0.6V
DC.
5. Apply external 17.3V DC at TP651-3 by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and plug
the AC cord power on. Now make sure that normal
picture appears on the screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 120V AC
line voltage, with a strong air signal or a properly tuned
in test signal.
3. Enter the service mode and select the service
adjustment "V95" and Bus data "02" (Y-mute on, CRT
Cut Off).
4. The voltage should be below 35.0kV (at zero beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the voltage test,
make Y-mute off to the normal mode.
INSTALLATION AND SERVICE INSTRUCTIONS
Note:
(1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes.
Summary of Contents for 32SF670
Page 19: ...19 32SF670 M E M O ...
Page 20: ...20 32SF670 CHASSIS LAYOUT ...
Page 21: ...21 32SF670 BLOCK DIAGRAM ...
Page 23: ...23 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 SCHEMATIC DIAGRAM CRT Unit ...
Page 24: ...24 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 SCHEMATIC DIAGRAM MAIN 1 Unit ...
Page 25: ...25 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 26: ...26 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 SCHEMATIC DIAGRAM MAIN 2 Unit ...
Page 27: ...27 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 28: ...28 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 SCHEMATIC DIAGRAM 2 LINE Y C Unit ...
Page 29: ...29 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 30: ...30 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 SCHEMATIC DIAGRAM CONTROL Unit ...
Page 31: ...31 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 33: ...33 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 34: ...34 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 PWB A MAIN Unit Components side ...
Page 35: ...35 17 16 19 18 15 14 13 12 11 10 32SF670 ...
Page 37: ...37 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 32SF670 PWB F CONTROL Unit Wiring Side ...