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(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
Signal
(A1)
• Ext. S-input
(A2)
• Ext. input
(A3)
• Color (colour) bar signal [PAL]
Mode
(B1)
• EE SP
(B2)
• S-VHS SP
(B3)
• VHS SP
Equipment
(C)
• Oscilloscope
Measuring point (D)
• Y OUT terminal
EVR mode
(F1)
• Jig code "57"
EVR address
(F2)
• A : 11
(F3)
• Jig code "21" twice
(F4)
• Jig code "18" or "19" (Channel +/-)
Specified value (G) • 1.00 ± 0.05 Vp-p (75 ohm terminated)
Adjustment tool (H)
• Jig RCU [PTU94023B]
(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).
H. rate
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
Signal
Mode
Equipment
Measuring point (D1)
Adjustment part (F)
Specified value (G)
(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
Signal
Mode
Equipment
Measuring point (D)
External trigger (E)
Adjustment part (H)
Specified value (G1)
(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.)
Specified
Y level
value (G2)
Timer clock
(A1) • No signal
(B)
• EE
(C)
• Frequency counter
• IC3001 pin 44
(D2)
• IC3001 pin 103
(D3)
• C3054 + and -
• C3025 (TIMER CLOCK)
• 1024.008 ± 0.001 Hz
(976.5549 ± 0.0010 usec)
Audio REC FM
(A1)
• Ext. input
(A2)
• Audio: No signal
(A3)
• Video: Color (colour) bar signal [PAL]
(B)
• S-VHS LP
(C)
• Oscilloscope
• TP2253 (A. PB. FM)
• TP111 (D.FF)
• VR2251 (REC. FM)
• 600 ± 100 mVp-p
(G2)
• More than 400 mVp-p
V. rate
Fig.4-3c Audio REC FM
Specified
value (G1)
(No.YD002)1-21
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