ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
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 (YG6260M).
(To prevent the damage to IC's and transistors.)
On-Screen Display Adjustment
1.
2.
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 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.
CH-1
CH-2
6.5H
Fig. 2-1-A
Fig. 2-1-B
CH-2
CH-1
6.5H
2-2: RF AGC DELAY
1.
2.
3.
4.
5.
Receive the monoscope pattern.
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 (70dB).
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6.
7.
8. 0. RETURN
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7. STEREO/SAP
8. (VOL TEST) 0. END
"The adjustment items 2, 3, 6, 7 and 8 are not used for
this model."
Fig. 1-1
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.
"The adjustment item 2 is not used for this model."
Fig. 2-2
2-3: VCO FREERUN
1.
2.
3.
Receive the monoscope pattern. (AFT off)
Connect the digital voltmeter to TP601.
Adjust the L610 until the digital voltmeter is 3.1
±
0.05V.
2-4: TUNER AUDIO LEVEL
1.
2.
3.
4.
5.
Receive the monoscope pattern.
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 280
±
10mVrms.
D2-1
