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1-2
Safety Precautions
1. This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original design
unless authorized in writing by the manufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of
the product should not be made. Any design alterations or additions will void the manufacturer`s
warranty and will further relieve the manufacture of responsibility for personal injury or property
damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics.
These characteristics are often not evident from visual inspection nor can the protection afforded
by them necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special safety characteristics are identified in
the Parts List of Service Manual. Electrical components having such features are identified by
shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a
substitute replacement which does not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of Service Manual may create shock, fire, or other
hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the
like to be separated from live parts, high temperature parts, moving parts and/or sharp edges
for the prevention of electric shock and fire hazard. When service is required, the original lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts
of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control
shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure
the leakage current from each exposed metal parts of the cabinet , particularly any exposed
metal part having a return path to the chassis, to a known good earth ground. Any leakage
current must not exceed 0.5mA AC (r.m.s.)
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms
per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by
a 0.15 F AC-type capacitor between an exposed
metal part and a known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to eachexposed metal
part, particularly any exposed metal part having a
return path to the chassis, and meausre the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. voltage
measured Any must not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth groundPlace this
probe on
each exposed
metal part. AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
UX-G6/FS-6G
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UX-G6/FS-G6
Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
DANGER : Invisibie laser radiation
when open and interlock or
defeated.
AVOID DIRECT EXPOSURE TO
BEAM (e) VARNING : Osynlig laserstrålning är
denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen. (s) VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (f) ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (d)
CLASS 1
LASER PRODUCT
! CAUTION Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
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UX-G6/FS-G6
Procedures for adjusting the electrical circuit
The following adjustments should be performed after adjusting the tape traveling and head angles.
- The sequence of adjustment should in principle be according to the following order of description.
- The adjustment items denoted by asterisk should be performed whenever the head has been changed.
Items Adjusting position Reference value RemarksAdjusting
position
[0dBs = 0.775V]
Items Adjusting and confirmation methods frequency level deviation of output up and down values
Confirmation
of Dolby circuit
recording
(Recording
mode)Recording
Dolby B1kHz Cal-40dB
5kHz Cal-20dB
1kHz Cal 0dB+5.7dB 2dB
+3.5dB 1.5dB
0dB +0.5/-1 dB Frequency level
Deviation of output up
and down values
Input:[Line IN] (-8dBs)
Measuring points:Pin 8 of IC635
and pin 2 of CN641
Reference level at measuring
points 400Hz
-8dBs (=Cal. level)
Adjustment of
playing level
Adjustment of
playing
equalizer
Reference
value of
recording
input
Adjustment of
bias frequency
Adjustment of
recording and
playing
frequency
characteristicsWhile playing the test tape
VT724 (1kHz), adjust the
CN641 output to -25.5dBs with
VR611 and VR621.
(The L - R channel output
difference should be within
0.5dB).
While playing the test tape
TMT7063 (1kHz and 12.5kHz),
adjust the test point TP (CN641)
output to the reference values at
1kHz and 12.5kHz outputs with
VR612 (Lch) and VR622 (Rch).
Confirm that the input level at
the test point TP (CN641)
terminal is -25.5dB when
1kHz -28.2dBs has been
applied to the line input.
Connect the frequency counter
to the test points TP631 and
TP632 and adjust the bias
frequency to 100kHz with
Record 1kHz/12.5kHz with a
normal tape, and adjust the
deviation at 12.5kHz to +0
0.5dB with reference to 1kHz
by means of VR613 (Lch) and
VR623 (Rch). *2
*3
4
5
*6L:VR611
R:VR621
L:VR612
R:VR622
L6351
L:VR613
R:VR623
-25.5dBs
0.5dB
(L-R difference:
within 0.5dB)
With reference
to 1kHz, the
deviation of
12.5kHz
should be 1.5
0.5dB
Output level:
-25.5dBs 1dB
100kHz +9kHz
-1kHz
Normal tape:
0 0.5dB
Chrome tape:
0 4dBAdjust the playing level since
this level will be changed
whenever the head has been
changed.
At this time, the impedance of
electronic voltmeter should be
100 or more.
NR : OFF
By using the test tape
TMT7063 (12.5/1kHz/63Hz),
confirm that 63Hz:+2dB 3dB
with reference to 1kHz.
Tape : chrome
Mode : recording
Ref-20dB : [Value reduced by
as much as -20dB from the
reference input value] 28.2dB
The bias value in the case of
chromium tape will be set by
shifting the voltage with
reference to that in the case of
normal tape.
Unless the bias current has
been adjusted correctly, the
recording characteristics will
become as indicated in the
diagram on the left hand side.
Response (dB)
High frequency area up
High frequency area downBias current is smaller.
Bias current is appropriate.
Bias current is greater.
Frequency
050Hz 1kHz 12.5kHz
1
