5
26PL83M
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 and make sure
that the voltmeter reads 13.2 ±0.7V.
5. Apply external 16.3V DC at TP651 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 "V18" and Bus data "01" (Y-mute on, CRT
Cut Off).
4. The voltage should be approximately 29.0kV (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 26PL83M
Page 12: ...13 26PL83M 12 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H CHASSIS LAYOUT ...
Page 13: ...14 6 5 4 3 2 1 A B C D E F G H 26PL83M BLOCK DIAGRAM ...
Page 15: ...17 26PL83M 16 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN 1 Unit ...
Page 16: ...19 26PL83M 18 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN 2 Unit ...
Page 17: ...21 26PL83M 20 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM AV Unit ...
Page 18: ...22 6 5 4 3 2 1 A B C D E F G H 26PL83M SCHEMATIC DIAGRAM CRT Unit ...
Page 19: ...23 6 5 4 3 2 1 A B C D E F G H 26PL83M SCHEMATIC DIAGRAM CONTROL Unit ...
Page 20: ...24 6 5 4 3 2 1 A B C D E F G H 26PL83M SCHEMATIC DIAGRAM MTS MODULE Unit ...
Page 22: ...26 6 5 4 3 2 1 A B C D E F G H 26PL83M PWB A MAIN Unit Wiring Side ...
Page 23: ...27 6 5 4 3 2 1 A B C D E F G H 26PL83M PWB A MAIN Unit Chip Parts Side ...
Page 25: ...29 6 5 4 3 2 1 A B C D E F G H 26PL83M PWB F CONTROL Unit Wiring Side ...
