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(4) If the A.PB FM level is not within the specified value (G1),
perform the adjustment in a following procedure.
(5) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(6) Set the EVR address to (F2) by transmitting the code (F3)
from the Jig RCU.
(7) Transmit the code (F4) from the Jig RCU to adjust 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.)
(8) If the specified value (G1) is not obtained, transmit the
code (F4) from the Jig RCU to adjust so that the wave-
form level of the lower channel level becomes the speci-
fied value (G2). (Adjust before recording, then confirm it
by playing back.)
(9) 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.)
Specified
value (G2)
Fig. 3-4-1a
3.5
Demodulator circuit
Notes:
• Unless otherwise specified in this demod circuit ad-
justments, all measuring points and adjustment parts
are located on the Main board.
• Unless otherwise specified,set an audio multiplex TV
signal generator as follows;
RF signal : 70 dBµ / 75 Ø , color bar 87.5% modulation.
3.5.1 Input level
•
Signal
(A)
RF signal (Audio: mono 300 Hz)
•
Mode
(B)
Tuner
•
EE
•
Equipment
(C)
Audio level meter
•
Measuring point (D)
IC6501 pin 26
•
EVR mode
(F1)
Jig code "57"
•
EVR address
(F2)
A : 20
•
(F3)
Jig code "22" and "20"
•
(F4)
Jig code "18" or "19" (Channel +/-)
•
Specified value
(G)
500 ± 10 mVrms
•
Adjustment tool
(H)
Jig RCU [PTU94023B]
(1) Set an audio signal mode of the RF signal generator to
mono 300 Hz.
(2) Connect the equipment (C) to the measuring point (D).
(3) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(4) Set the EVR address to (F2) by transmitting the code (F3)
from the Jig RCU.
(5) Transmit the code (F4) from the Jig RCU to adjust so that
the level of the measuring point (D) becomes the speci-
fied value (G).
(6) 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.)
3-5
Specified
value (G1)
V. rate
Audio REC FM
Published in Heiloo Holland
3.5.2 Stereo VCO
•
Signal
(A)
No signal
•
Mode
(B)
Tuner
•
EE
•
Equipment
(C)
Frequency counter
•
Measuring point (D1)
IC6501 pin 26
•
Short point
(D2)
C6505(–) terminal
•
EVR mode
(F1)
Jig code "57"
•
EVR address
(F2)
A : 21
•
(F3)
Jig code "22" and "21"
•
(F4)
Jig code "18" or "19" (Channel +/-)
•
Specified value
(G)
15.73 ± 0.1 kHz
•
Adjustment tool
(H)
Jig RCU [PTU94023B]
(1) Connect the short wire between the short point (D2) and
the GND (Ground).
(2) Connect the equipment (C) to the measuring point (D1).
(3) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(4) Set the EVR address to (F2) by transmitting the code (F3)
from the Jig RCU.
(5) Transmit the code (F4) from the Jig RCU to adjust so that
the frequency of the measuring point (D1) becomes the
specified value (G).
(6) 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.)
(7) Disconnect the short wire between the short point (D2)
and the GND (Ground).
3.5.3 Stereo filter
•
Signal
(A)
RF signal (Audio: No signal)
•
Mode
(B)
Tuner
•
EE
•
Equipment
(C)
Oscilloscope
•
Measuring point (D)
IC6501 pin 26
•
EVR mode
(F1)
Jig code "57"
•
EVR address
(F2)
A : 22
•
(F3)
Jig code "22" twice
•
(F4)
Jig code "18" or "19" (Channel +/-)
•
Specified value
(G)
Minimum level
•
Adjustment tool
(H)
Jig RCU [PTU94023B]
(1) Set an audio signal mode of the RF signal generator to
no signal.
(2) Connect the equipment (C) to the measuring point (D).
(3) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(4) Set the EVR address to (F2) by transmitting the code (F3)
from the Jig RCU.
(5) Transmit the code (F4) from the Jig RCU to adjust so that
the level of the measuring point (D) becomes the speci-
fied value (G).
(6) 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.)
29/11/2016
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