3-2
3.1.5 EVR Adjustment
Some of the electrical adjustments require the adjustment
performed by the EVR system. The Main board assembly
have EEPROMs for storing the EVR adjustment data and user
setups.
Notes:
•
In the EVR adjustment mode, the value is varied with
the channel buttons (+, –). The adjusted data is stored
when the setting mode changes (from PB to STOP,
when the tape speed is changed, etc.). Take care to
identify the current mode of each adjustment item
when making an adjustment.
•
When changing the address setting in the EVR adjust-
ment mode, use the Jig RCU or the remote controller
having numeric keypad with which a numeric code can
be directly input.
The remote control code of the Jig RCU corresponds
to each of the digit keys on the remote controller as
follows.
•
As the counter indication and remaining tape indica-
tion are not displayed FDP during the EVR adjustment
mode, check them on the TV monitor screen.
•
When performing the EVR adjustment, confirm that the
FDP indication is changed to the EVR mode, as shown
below.
Fig. 3-1-5a EVR mode
FDP
3.2 SERVO CIRCUIT
3.2.1 Switching point
Signal
(A1)
• Stairstep signal
(A2)
• Alignment tape [MHP]
Mode
(B)
• PB
Equipment
(C)
• Oscilloscope
Measuring point
(D1)
• VIDEO OUT terminal
(D2)
• TP106 (PB. FM)
External trigger
(E)
• TP111 (D.FF)/slope : –
Adjustment part
(F)
• Jig RCU: Code “5A”
Specified value
(G)
• 7.5 ± 0.5H [MHP]
Adjustment tool
(H)
• Jig RCU [PTU94023B]
(4) Adjust tracking by pressing the channel buttons (+, –) so
that the V.PB FM waveform becomes maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the
code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed.
(6) If the VCR enters the eject mode, repeat steps (1) to (5)
again.
(7) Play back the alignment tape (A2) again, confirm that the
switching point is the specified value (G).
Fig. 3-2-1a Switching point
V.sync
Switching
point
7.5
±
0.5H
V. rate
3.2.2
Slow tracking preset
Signal
(A1)
• Ext. input
(A2)
• Color bar signal
Mode
(B1)
• S-VHS
(B2)
• REC (SP/EP)
¥
Slow PB
Measuring point
(D)
• TV-Monitor
Adjustment part
(F)
• Jig RCU: Code “71“ or “72”
Specified value
(G)
• Minimum noise
Adjustment tool
(H)
• Jig RCU [PTU94023B]
(1) Record the signal (A2) in the SP mode, and play back the
recorded signal.
(2) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(3) Set the VCR to the FWD slow mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that
the noise bar becomes the specified value (G) on the TV
monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in
the slow mode.
(7) Repeat steps (3) to (6) in the REV slow mode.
(8) Repeat steps (1) to (7) in the EP mode.
Note:
•
For FWD slow playback, transmit the code “08” from
the Jig RCU to enter the slow playback mode, and
transmit the code “D0” for REV slow mode.
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at
the measuring points (D1) and (D2).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
Digit-key
0
1
2
3
4
5
6
7
8
9
Code
20 21
22 23
24
25
26
27 28 29
