ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
CH-2
CH-1
6.5H
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
When replacing IC's or transistors, use only specified
silicon grease.
(To prevent the damage to IC's and transistors.)
On-Screen Display Adjustment
1.
2.
CH-1
CH-2
6.5H
2-2: VCO
1.
2.
3.
4.
Unplug the AC plug for more than 30 minutes to set the
clock to the non-setting state. (To release the Back-Up
immediately, take the short circuit between C1003 and
GND at the Power Off.) Then, set the volume level to
minimum.
Press the VOL. DOWN button on the set and the
channel button (9) on the remote control for more than
2 seconds to display adjustment mode on the screen
as shown in Fig. 1-1.
NOTE
Fig. 1-1
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
2.
3.
4.
Connect CH-1 on the oscilloscope to TP4001 and CH-2
to pin 7 of CP603.
Playback the alignment tape.
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears. If the indicator REC
disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
5.
6.
7.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears.
When the REC indicator is blinking, press both VOL.
DOWN button on the set and the channel button (4) on
the remote control simultaneously and adjust the
Tr/- button until the arising to the down of Head
Switching Pulse becomes 6.5
±
0.5H.
(Refer to Fig. 2-1-A, B)
Press the Tracking Auto button.
Use the channel buttons (1-8) on the remote control to
select the options shown in Fig. 1-1.
Press the channel button (0) or MENU button on the
remote control to end the adjustments.
Place the set with Aging Test for more than 10 minutes.
Connect the oscillator (39.5MHz) to pin 11 of TU601
through 100
Ω
resistor.
Connect the digital voltmeter between the pin 47 of
IC601.
Adjust the L608 until the digital voltmeter is 3.8
±
0.05V.
Fig. 2-1-A
Fig. 2-1-B
2-3: RF AGC
1.
2.
3.
4.
5.
Receive the UHF (80dB).
Connect the digital voltmeter between the pin 5 of
CP603 and the pin 1 (GND) of CP603.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (5) on the remote control to
select "OTHERS". The Fig. 2-2 appears on the display.
Press the channel button (1) on the remote control to
select "RF AGC DELAY".
Press the PLAY or STOP button on the remote control
until the digital voltmeter is 2.5
±
0.05V.
Fig. 2-2
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7.
8. 0. END
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6. (VOL TEST)
7.
8. 0. RETURN
