Electrical Adjustments - Toshiba MW24FM1C 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.
• When you exchange IC and Transistor for a heat sink,
apply the silicon grease on the contact section of the
heat sink. Before applying new silicon grease, remove all
the old silicon grease. (Old grease may cause damages
to the IC and Transistor).
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
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.
Press the VOL. DOWN button on the set and the
2.
Channel button (9) on the remote control for more than
2 seconds 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.

ELECTRICAL ADJUSTMENTS

TV
20
Fig. 1-1
NO. FUNCTION
00 OSD H
01 CUT OFF
02 RF.AGC
03 ---
04 H.POSI
05 V.POSI
06 H.SIZE
07 V.SIZE
08 V.CENT
09 V.LIN
10 VS.CORR
11 G.DRV
12 B.DRV
13 R.BIAS
14 G.BIAS
15 B.BIAS
16 BRI CENT
17 BRI MAX
18 BRI MIN
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1. Connect CH-1 on the oscilloscope to TP102 and CH-2
to TP4201.
2. Playback the alignment tape.
3. Press both VOL. DOWN button on the set and the
Channel button (5) on the remote control for 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 for more than 2
seconds 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 for more than
2 seconds 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 for more than 2 seconds 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)
D3-1
NO. FUNCTION
19 SUB CONT
20 UNI COL CENT
21 UNI COL MAX
22 UNI COL MIN
23 COL CENT
24 COL MAX
25 COL MIN
26 TINT
27 SHARP
28 RGB CONT
29 PARABOLA
30 TRAPEZIUM
31 COR TOP
32 COR BTM
33 V EHT
34 H EHT
35 FM.LVL
36 T.STE
CH-2
6.5H
CH-1
CH-2
CH-1
6.5H
Fig. 1-2
Fig. 2-1-A
Fig. 2-1-B