JVC CA-C55BK - Record Sensitivity and Erase Ratio Checks; Music Scan Check

DX-C55BK
Adjustment Method Pause Siansald Remarks
Location Value
. Input a 1 kHz( ~8.2dBs: 300mV) signal to VCR Adjust with normal tape and |
/PHONO terminals and record it on the left —5.5dBs_ |make sure that the left/right
and right channels . level difference is 1.0dB or less
. Connect an electronic voltmeter to the DOLBY CAVE)
TP (figure 3) to confirm the values.
. If the values are not satisfied , adjust the
semi-fixed resistors and record the signals
again to confirm the values.
Erase ratio . Record a music source using metal tape.
. Rewind and erase the recorded section.
. Comfirm nothing can be heard.
Make sure to operate AUTO STOP at the end of
tape running and not to operate on the way of
the playing.
1. Make sure not to work the music scanning
operation at the start of tape wind using
TMT-6237.
. Make sure to work the music scanning
operation at the end of tape wind using TMT-
6247.
Mechanism controller PCB (ENB-179-2)
i= R400 (NORMAL)
TAPE SPEED
PB Freq. response
BIAS ADJ.
A-L (R361) (4) KY A-R (R362) BIAS
BIAS T.P. R356 (R) ea
A-L (R381) A-R (R382) | oe W139
E eo W138 R355 (L)
Front
PB
Level
R
e—e
W136
Rear
R351
(L)
R352
(R)
PB
Freq.
response
RECLEVELADJ.
—_
8.357)
GY
GB
RR358)
:
B-L
(R353)
B-R
(R354)
DOLBY
T.P.
:
REESE)
|
oe
W110
E
@—e
W225
R
@—e
W224
ENH-238-6
Figure
3
2-14 (No. 20474)