Panasonic AG-TL750E / AG-TL750B Service Manual ▷ View online
3-7
Measuring
Measuring point (
* )
No.
Item
instruments &
Mode
Adjustment parts (
- )
Adjustment procedure
Input signals
Adjustment level (
+ )
(1) Insert a S-VHS cassette tape.
(2) Apply the color bar signal input.
(3) Set EVR ADJUST mode "10" as described in
(2) Apply the color bar signal input.
(3) Set EVR ADJUST mode "10" as described in
the EVR ADJUST MODE setting method.
(4) Record the color bar signal and play it back.
(5) Adjust the [V.LOCK –] or [V.LOCK +] button to
(5) Adjust the [V.LOCK –] or [V.LOCK +] button to
set the Y level (100% white) at the adjustment
point to the adjustment level.
point to the adjustment level.
9
S-VHS
PB Y level
adjustment
PB Y level
adjustment
Oscilloscope
(H rate),
Color bar signal
(H rate),
Color bar signal
↓
VIDEO IN
3H REC
↓
3H PB
EVR ADJUST 10
EVR ADJUST 10
* VIDEO OUT terminal,
75
Ω terminated
- [V.LOCK –/+] buttons
+ 1 Vp-p
+ 1 Vp-p
(1) Apply the color bar signal input.
(2) Set EVR ADJUST mode "16" as described in
(2) Set EVR ADJUST mode "16" as described in
the EVR ADJUST MODE setting method.
(3) Adjust the oscilloscope gain so that the burst
signal level becomes 4 divisions.
(4) Adjust the [V.LOCK –] or [V.LOCK +] button to
set the pilot burst level at the measurement
point to 4.4 divisions.
point to 4.4 divisions.
8
Pilot burst
level adjust-
ment
level adjust-
ment
Oscilloscope
(Trigger:VIDEO
OUT, H rate),
Color bar signal
(Trigger:VIDEO
OUT, H rate),
Color bar signal
↓
VIDEO IN
* TP5 [MAIN]
- [V.LOCK –/+] buttons
+ Burst level × 1.1
- [V.LOCK –/+] buttons
+ Burst level × 1.1
EE
EVR ADJUST 16
EVR ADJUST 16
(1) Tilt the MAIN board as discribed in section
1.1.7 (1), (2) and (3).
(2) Apply the color bar signal input.
(3) Adjust the FL3 to set the DC level to the ad-
(3) Adjust the FL3 to set the DC level to the ad-
justment level.
10
LC VCO level
adjustment
adjustment
Digital voltmeter,
Color bar signal
Color bar signal
↓
VIDEO IN
EE
* TP4 [MAIN]: 12Q
- FL3 [MAIN]: 11I
+ 2.5Ⳳ0.1V
- FL3 [MAIN]: 11I
+ 2.5Ⳳ0.1V
DC
GND TP7 [MAIN]: 15Q
1 Vp-p
3-8
Measuring
Measuring point (
* )
No.
Item
instruments &
Mode
Adjustment parts (
- )
Adjustment procedure
Input signals
Adjustment level (
+ )
CAUTION
After the SP mode adjustments, be sure to
perform SP TL mode adjustments in steps
(7) to (12).
After the SP mode adjustments, be sure to
perform SP TL mode adjustments in steps
(7) to (12).
11
S-VHS ET
SP REC color
level adjust-
ment
SP REC color
level adjust-
ment
Oscilloscope
(Trigger:D-FF
TP4[P/R]:7F),
Color bar signal,
Alignment tape
VFK1743
(Trigger:D-FF
TP4[P/R]:7F),
Color bar signal,
Alignment tape
VFK1743
SP mode
3H PB
3H PB
3H REC
↓
3H PB
EVR ADJUST 02
EVR ADJUST 02
* TP6 [P/R]: 8F
- [V.LOCK –/+] buttons
+ +1.0 dB
- [V.LOCK –/+] buttons
+ +1.0 dB
GND TP3 [P/R]: 5F
SP TL mode
3H PB
3H PB
24H REC
↓
3H PB
(7) Play the alignment tape in 3H mode and ad-
just tracking to maximize the color level.
(8) Adjust the oscilloscope gain so that the chan-
nel with the higher level becomes 4 divisions.
(9) Insert a VHS cassette tape.
(10) Record the color bar signal in 24H mode and
(10) Record the color bar signal in 24H mode and
play the recording in 3H mode.
(11) Ensure that the color level of the channel with
the higher level is between +1.0 and 0 dB of
the level in step (8) (i.e. occupying 4.5 to 4
divisions).
the level in step (8) (i.e. occupying 4.5 to 4
divisions).
(12) If adjustment is required, set EVR ADJUST
mode "02", adjust the [V.LOCK –] or [V.LOCK
+] button to set the color level before record-
ing, and perform checking in steps (9) to (11)
again.
+] button to set the color level before record-
ing, and perform checking in steps (9) to (11)
again.
(1) Apply the color bar signal input.
(2) Play the alignment tape and adjust tracking to
(2) Play the alignment tape and adjust tracking to
maximize the color level.
(3) Adjust the oscilloscope gain so that the chan-
nel with the higher level becomes 4 divisions.
(4) Insert a VHS cassette tape, record and play
the color bar signal.
(5) Ensure that the color level of the channel with
the higher level is +1.0 dB of the level in step
(3) (i.e. occupying 4.5 divisions).
(3) (i.e. occupying 4.5 divisions).
(6) If adjustment is required, set EVR ADJUST
mode "02", adjust the [V.LOCK –] or [V.LOCK
+] button to set the color level before record-
ing, and perform checking in steps (4) and (5)
again.
+] button to set the color level before record-
ing, and perform checking in steps (4) and (5)
again.
V.LOCK +: Level UP
V.LOCK –: Level DOWN
V.LOCK –: Level DOWN
+ +1.0 to 0 dB
Check that this is 4.5 divisions when material
recorded with the same unit is played.
recorded with the same unit is played.
Set to 4 divisions when
VFK1743 is played.
VFK1743 is played.
3-9
Measuring
Measuring point (
* )
No.
Item
instruments &
Mode
Adjustment parts (
- )
Adjustment procedure
Input signals
Adjustment level (
+ )
CAUTION
After the SP mode adjustments, be sure to
perform SP TL mode adjustments in steps
(7) to (12).
After the SP mode adjustments, be sure to
perform SP TL mode adjustments in steps
(7) to (12).
12
S-VHS
SP REC color
level adjust-
ment
SP REC color
level adjust-
ment
Oscilloscope
(Trigger:D-FF
TP4[P/R]:7F),
Color bar signal,
Alignment tape
VFK1743
(Trigger:D-FF
TP4[P/R]:7F),
Color bar signal,
Alignment tape
VFK1743
SP mode
3H PB
3H PB
3H REC
↓
3H PB
EVR ADJUST 02
EVR ADJUST 02
* TP6 [P/R]: 8F
- [V.LOCK –/+] buttons
+ +2.0 dB
- [V.LOCK –/+] buttons
+ +2.0 dB
GND TP3 [P/R]: 5F
SP TL mode
3H PB
3H PB
24H REC
↓
3H PB
(7) Play the alignment tape in 3H mode and ad-
just tracking to maximize the color level.
(8) Adjust the oscilloscope gain so that the chan-
nel with the higher level becomes 4 divisions.
(9) Insert a S-VHS cassette tape.
(10) Record the color bar signal in 24H mode and
(10) Record the color bar signal in 24H mode and
play the recording in 3H mode.
(11) Ensure that the color level of the channel with
the higher level is between +1.0 and 2.0 dB
of the level in step (8) (i.e. occupying 4.5 to 5
divisions).
of the level in step (8) (i.e. occupying 4.5 to 5
divisions).
(12) If adjustment is required, set EVR ADJUST
mode "02", adjust the [V.LOCK –] or [V.LOCK
+] button to set the color level before record-
ing, and perform checking in steps (9) to (11)
again.
+] button to set the color level before record-
ing, and perform checking in steps (9) to (11)
again.
(1) Apply the color bar signal input.
(2) Play the alignment tape and adjust tracking to
(2) Play the alignment tape and adjust tracking to
maximize the color level.
(3) Adjust the oscilloscope gain so that the chan-
nel with the higher level becomes 4 divisions.
(4) Insert a S-VHS cassette tape, record and play
the color bar signal.
(5) Ensure that the color level of the channel with
the higher level is +2.0 dB of the level in step
(3) (i.e. occupying 5 divisions).
(3) (i.e. occupying 5 divisions).
(6) If adjustment is required, set EVR ADJUST
mode "02", adjust the [V.LOCK –] or [V.LOCK
+] button to set the color level before record-
ing, and perform checking in steps (4) and (5)
again.
+] button to set the color level before record-
ing, and perform checking in steps (4) and (5)
again.
V.LOCK +: Level UP
V.LOCK –: Level DOWN
V.LOCK –: Level DOWN
Set to 4 divisions when
VFK1743 is played.
VFK1743 is played.
Check that this is 5 divisions when material
recorded with the same unit is played.
recorded with the same unit is played.
+ +1.0 to 2.0dB
3-10
Measuring
Measuring point (
* )
No.
Item
instruments &
Mode
Adjustment parts (
- )
Adjustment procedure
Input signals
Adjustment level (
+ )
13
Frequency
response
adjustment
response
adjustment
Oscilloscope
(Trigger:D-FF
TP4[P/R]:7F),
Y/C video
sweep signal
(Trigger:D-FF
TP4[P/R]:7F),
Y/C video
sweep signal
↓
Y/C IN
3H REC
↓
3H PB
* Y/C Y OUT terminal,
75
Ω terminated
- VR4 [MAIN]: 15M
+ 4 div. (3 MHz)
+ 4 div. (3 MHz)
(1) Press the [MENU] button, select the "VIDEO/
VTR MODE" of the main menu, and change
the VIDEO INPUT to "YC".
the VIDEO INPUT to "YC".
(2) Insert a S-VHS cassette tape.
(3) Record the Y/C video sweep signal and play it
(3) Record the Y/C video sweep signal and play it
back.
(4) Adjust the oscilloscope gain so that the
100kHz level becomes 5 divisions.
(5) Adjust the VR4 to set the 3 MHz level at the
measurement point to the adjustment level.
5 div.
100kHz
3MHz
4 div. (–2.0 dB)
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