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(No.YD002)1-21

(1) Record the signal (A2) in the mode (B1), and play back

the recorded signal.

(2) Set the VCR to the manual tracking mode.
(3) Set the VCR to the FWD slow (+1/6x) 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 (-1/6x) mode.
(8) Repeat steps (1) to (7) in the mode (B2).

Note:

•

For FWD slow (+1/6x) playback, transmit the code “08”

from the Jig RCU to enter the slow playback mode, and

transmit the code “D0”for REV slow (-1/6x) mode.

4.3.2 Video circuit
4.3.2.1 EE Y/PB Y (S-VHS) level

(1) Input the signal (A3) from the input point (A1).
(2) Set the VCR to the mode (B1).
(3) Observe the Y OUT waveform at the measuring point (D).
(4) Set the VCR to the EVR mode by transmitting the code (F1)

from the Jig RCU.

(5) Set the EVR address to (F2) by transmitting the code (F3)

from the Jig RCU.

(6) Transmit the code (F4) from the Jig RCU to adjust so that

the Y level of the Y OUT waveform becomes the specified
value (G).

(7) Release the EVR mode of the VCR by transmitting the

code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)

(8) Input the signal (A3) from the input point (A2).
(9) Repeat steps (3) to (7) in the mode (B1).

(10) Record the signal (A3) in the mode (B2), and play back the

recorded signal.

(11) Set the VCR to the manual tracking mode.
(12) Repeat steps (3) to (7) in the mode (B2).
(13) Record the signal (A3) in the mode (B3), and play back the

recorded signal.

(14) Set the VCR to the manual tracking mode.
(15) Repeat steps (3) to (7) in the mode (B3).

Fig.4-3b EE Y/PB Y lebel

4.3.3 Syscon circuit
Notes:

•

When perform this adjustment, remove the Mechanism

assembly.

4.3.3.1 Timer clock

(1) Connect the frequency counter to the measuring point

(D1).

(2) Connect the short wire between the short point (D2) and

Vcc (5V).

(3) Short the leads of capacitor (D3) once in order to reset

the microprocessor of the Syscon.

(4) Disconnect the short wire between the short point (D2)

and Vcc then connect it again.

(5) Adjust the Adjustment part (F) so that the output frequency

becomes the specified value (G).

4.3.4 Audio circuit [S-VHS models]
Notes:

•

GND (Ground) should be taken from the Tuner shield

case.

4.3.4.1 Audio REC FM

(1) Apply the external trigger signal to D.FF (E) to observe the

Audio PB FM waveform at the measuring point (D).

(2) Record the signal (A3) with no audio signal input in the

mode (B), and play back the recorded signal.

(3) Set the VCR to the manual tracking mode.
(4) If the A.PB FM level is not within the specified value (G1),

perform the adjustment in a following procedure.

(5) Adjust the adjustment part(F) so that the A. PB FM level of

the higher channel level becomes the specified value(G1).
(Adjust before recording, then confirm it by playing back.)

(6) If specified value(G1) is not obtained, adjust the Adjust-

ment part(F) so that the waveform level of the lower chan-
nel level becomes the specified value(G2).(Adjust before
recording, then confirm it by playing back.)

Fig.4-3c Audio REC FM

Signal

(A1)
(A2)
(A3)

• Ext. S-input
• Ext. input
• Color (colour) bar signal [PAL]

Mode

(B1)
(B2)
(B3)

• EE SP
• S-VHS SP
• VHS SP

Equipment

(C)

• Oscilloscope

Measuring point (D)

• Y OUT terminal