Before Making Electrical Adjustments; Basic Adjustments - Toshiba MV19L3C Service Manual

1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
• Use an isolation transformer when performing any
service on this chassis.
• Before removing the anode cap, discharge electricity
because it contains high voltage.
• When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
Inferior silicon grease can damage IC's and transistors.
• When replacing IC's and transistors, use only specified
silicon grease.
Remove all old silicon before applying new silicon.
On-Screen Display Adjustment
1. 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.
2. Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control simultaneously
to appear the adjustment mode on the screen as shown
in Fig. 1-1.
00 OSD
3. Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
4. Press the MENU button on the remote control to end
the adjustments.
NO. FUNCTION
00 OSD H
01 CUT OFF
02 RF DELAY
03 VIF VCO
04 H VCO
05 H PHASE
06 V SIZE
07 V SHIFT
08 R DRIVE
09 B DRIVE
10 R BIAS
11 G BIAS
12 B BIAS
ELECTRICAL ADJUSTMENTS
TV
15
Fig. 1-1
NO. FUNCTION
13 BRIGHTNESS
14 CONTRAST
15 COLOR
16 TINT
17 SHARPNESS
18 FM LEVEL
19 LEVEL
20 SEPARATION 1
21 SEPARATION 2
22 TEST MONO
23 TEST STEREO
24 X-RAY TEST
Fig. 1-2

2. BASIC ADJUSTMENTS

(VCR SECTION)
2-1: PG SHIFTER
1. Connect CH-1 on the oscilloscope to TP1002 and CH-2
to pin 4 of CP1003.
2. Playback the alignment tape.
3. Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
4. 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. Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears.
6. 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
Tracking +/- button until the arising to the down of Head
Switching Pulse becomes 6.5 ± 0.5H.
(Refer to Fig. 2-1-A, B)
7. Press the Tracking Auto button.
6.5H
6.5H
2-2: VCO FREERUN
1. Place the set with Aging Test for more than 10 minutes.
2. Receive the VHF HIGH.
3. Disconnect the Antenna while receiving the VHF HIGH
and set to the Noise screen.
4. Once turn off the Power and turn on the Power again.
5. Approxi. 3 seconds later, input the Antenna again.
6. Connect the digital voltmeter between the pin 5 of
CP351 and the pin 1 (GND) of CP351.
7. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "VIF VCO".
8. Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5 VDC.
9. After the 2.5V adjustment, countdown the VIF VCO step
No. by 1 step with the VOL. DOWN button.
CH-2
CH-1
Fig. 2-1-A
CH-2
CH-1
Fig. 2-1-B