JVC PC-X95B - Deck Adjustment

'C-X95ee/eewe |
4-2
Connection
of
FM
SSG
;
oe
(1)
Modulation:
(2)
Frequency:
(3)
Output
level
of
the
atttenuator
in
FM
SSG:
400 Hz, 22.5 kHz dev.
Refer to the following list shown in item 4-4. ;
The level shall be decided by the load resistance of the receiver
mentioned in the basic conditions.
4-3 Connection of sweeper and the receiver
(1) Tuner input:
(2) Output measuring position:
4-4 Alignment
| Band Select | Sortof Antenna to
Switch Position be attached to SSG
Positive side to TP1, Negative side to TP2
Speaker terminal
Frequency of SSG Variable Capacitor Position
7.5 MHz (B/E/G/EN ;
ersten | Macanscty
109.0 MHz (B/E/EN)
108.3 MHz (G/GI)
Adjust the above aligning position (L1 & TC1, 11) repeatedly so that the
tuner can receive above frequency range (bandwidth).
To receive 90.0 MHz
To receive 106.0 MHz
Adjust the above aligning position (L2 & TC2) repeatedly so that the tuner
can obtain the best sensitivity.
Aligning Position
Min. capacity _ Ct, 11
FM Dummy Antenna
(E/B/EN) (75 Q, unbalanced)
L2
5. FM MPX ALIGNMENT
© 19 kHz Alignment (Regular method)
(1) Connect a frequency counter through 100 kQ load to the test point TP4 (earth = TP3).
(2) Supply the monaural signal (98 MHz, 60 dB) across the test points TP5 and TP6.
(3) Adjust the semi-fixed resistor VR1 so that the frequency becomes 19 kHz + 10 Hz.
Check and Adjustment Procedure Adjusting Point
Head azimuth VTT703 | For both of mechanism A and B, adjust setscrews to | TAPE: NORMAL | Mechanism A
adjustment (10 kHz) | maximize output level and to minize phase difference | « Mechanism A (REC/PB):
between R and L channels. After adjustments, apply Left setscrew
screw sealant to lock setscrews. MechanismB(PB):
If fine adjustment is needed after reassembly, do it by 3 3 Left setscrew
inserting a screwdriver through the adjusting hole
between the door and button. :
Ht Deck Adjustment
Tape speed VT1712 | Play the test tape VTT712 on the mechanism A and | TAPE: NORMAL | VR371
adjustment
adjust
VR371
so
that
frequency
counter
reads
3010
+
Mechanism
A:
i 10 Hz. Adjust nearly with
Set the DUBBING switch to HIGH speed, and play back | TAPE: HIGH tape end.
the test tape on the mechanism B and record it on the
mechanism A while confirming tape speed of 5200 to
5800 Hz.
Wow & flutter | V11712 | Must be within 0.38 % (JIS Unweighted) TAPE: NORMAL
check (1 kHz)
PB
output
V11724
|
Play
back
VIT724
test
tape
while
confirming
that
speaker
|
TAPE:
NORMAL
level
check
(1
kHz)
|
output
is
2.7
V
or
more
as
the
volume
is
set
to
maximum.
PB frequency V1TT736 | Confirm respective frequencies as compared with 1 kHz. | TAPE: NORMAL
response
check
8
kHz
signal:
+0
£
3dB,
125
Hz
signal:
+2
+
3
dB
REC bias (TS-8) First confirm nothing wrong, then adjust as follows. $301 (BEAT CUT)| L341
frequency Normal | Set the BEAT CUT switch (S103) to the position 1 and | Position 1:
adjustment tape adjust L341 so that oscillation frequency is 67.5 kHz + 70 kHz
2 kHz at the terminal of C345. Position 2:
(For this adjustment, connect 1 MQ resistor in series.) 67.5 kHz
REC frequency Supply 1 kHz, -3 dBs sigan! to TP1 input while confirming
response that REC/PB output level is 0 + 3 dB compared with
adjustment monitor level.
REC/PB output | (TS-8) Mechanism A:
level check Normal | Input reference signals to TP1 and adjust VR341 so that
tape REC/PB output level is as follows compared with 1 kHz
level. (Reference input level: 50 dB)
8 kHz signal: 0 dB + 3 dB, 125 Hz signal: +1 dB + 3 dB
24 (No. 1859)