Electrical Adjustments - Orion MD17 Service Manual

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. Unplug the AC plug for more than 30 minutes 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 for more than 2
seconds 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) or MENU button on the
remote control to end the adjustments.
1. H/V
2. WHITE BALANCE
3. SECAM
4. PICTURE
5. OTHERS
6.
7.
8. (VOL TEST)
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1. Connect CH-1 on the oscilloscope to TP4001 and CH-2
to TP4501.
2. Playback the alignment tape. (JG001E)
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. Stop the alignment tape.

ELECTRICAL ADJUSTMENTS

0. END
Fig. 1-1
2-2: VCO
(MONITOR TUNER)
1. Place the set with Aging Test for more than 10 minutes.
2. Receive the UHF or VHF.
Connect the oscillator (38.9MHz) to TP602 through 100
3.
ohm resistor.
Connect the digital voltmeter between the pin 6 of
4.
CP603 and the pin 1 (GND) of CP603.
5. 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 (6) on the remote control to
6.
select "AFT".
7. Press the PLAY or STOP button on the remote control
until the digital voltmeter is 2.4 ± 0.1V.
8. Press the MENU button on the remote control for three
times.
9. Receive the VHF LOW SECAM.
10. Connect the oscillator (33.95MHz) to TP602 through
100 ohm resistor.
11. Press the PLAY or STOP button on the remote control
until the digital voltmeter is 2.4 ± 0.1V.
2-3: RF AGC DELAY
(MONITOR TUNER)
1. Receive the VHF HIGH.
2. Connect the digital voltmeter between the pin 5 of
CP603 and the pin 1 (GND) of CP603.
3. 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.
4. Press the channel button (1) on the remote control to
select "RF AGC DELAY".
5. Press the PLAY or STOP button on the remote control
until the digital voltmeter is 2.9 ± 0.15V.
D2-1
CH-2
6.5H
CH-1
CH-2
CH-1
6.5H
Fig. 2-1-A
Fig. 2-1-B