D2-1
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
Fig. 2-1-B
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 (G746).
(To prevent the damage to IC's and transistors.)
On-Screen Display Adjustment
1.
2.
Unplug the AC plug for more than 5 seconds to set the
clock to the non-setting state. Then, set the volume
level to minimum.
Press the VOL. DOWN button on the set and the
channel button (9) on the remote control
simultaneously to display adjustment mode on the
screen as shown in Fig. 1-1.
NOTE
Use the channel buttons (1-8) on the remote control to
select the options shown in Fig. 1-1.
Press the channel button (0) on the remote control to
end the adjustments.
"The adjustment items 3, 7 and 8 are not used for this
model."
Fig. 1-1
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7. STEREO/SAP
8. (VOL TEST) 0. END
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
2.
3.
4.
Connect CH-1 on the oscilloscope to TP1002 and CH-2
to TP4201.
Playback the alignment tape. (JG001A)
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.
CH-1
CH-2
6.5H
Fig. 2-1-A
2-2: VCO FREERUN
1.
2.
3.
4.
5.
6.
7.
Place the set with Aging Test for more than 15 minutes.
Receive the VHF HIGH.
Disconnect the Antenna while receiving the VHF HIGH
and set to the Noise screen.
Once turn off the Power and turn on the Power again.
Approxi. 3 seconds later, input the Antenna again.
Connect the digital voltmeter to TP601.
Adjust the L610 until the digital voltmeter is 3.1
±
0.05V.
2-3: RF AGC
1.
2.
3.
4.
5.
Receive the VHF HIGH (70dB).
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.
The Fig. 2-2 appears on the display.
Press the channel button (1) on the remote control.
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.25
±
0.05V.
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6.
7.
8. 0. RETURN
"The adjustment item 2 is not used for this model."
Fig. 2-2
2-4: TUNER AUDIO LEVEL
1.
2.
3.
4.
5.
Receive the VHF HIGH (70dB).
Connect the AC voltmeter to AUDIO OUT L/R.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (5) on the remote control.
The Fig. 2-2 appears on the display.
Press the channel button (3) on the remote control.
Press the VOL. UP/DOWN button on the remote
control until the AC voltmeter is 310
±
10mVrms.
