Jvc SPMXS 5 MD Service Manual

Page 2

CA-MXSSM D
CA-MXSSRM D
SP-MXSSMD

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 manufacturers
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 (A) 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.

0 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 areturn 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 1,5009 10W resistor paralleled by
a 0.15uF AC-type capacitor between an exposed

metal part and a known good earth ground. fixgghggO-FER
Measure the AC voltage across the resistor with the 7 ohms/volts,

AC voltmeter. or more sensitivity)
Move the resistor connection to eachexposed metal

part, particularly any exposed metal part having a 0.15uF ACTYPE

return path to the chassrs, and meausre the AC __ Place this
voltage across the resistor. Now, reverse the plug In probe on

the AC outlet and repeat each measurement. voltage 4 ' *r each exposed
measured Any must not exceed 0.75 V AC (r.m.s.), 150032 10W metal part.

This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground

-Warnrng
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." mains voltage selector is provided, check setting for local voltage.

A CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore,

1 2 pay attention to such burrs in the case of preforming repair of this system.

Page 72

CA-MXSSMD/MXSSHMD
SP-MXSSMD

IAN8771NFH (IC1) : MD RF & SERVO

1 . Pin layout
~ 49
3
I
8
~ 32
2.F'in function

:3 Symbol Function :3 Symbol FUnction

1 REFO APC reference voltage buffer output 33 HFSWH L Reflectivity select signal input terminal

2 G N D3 APC circuit ground termina 34 R FSWPG Pit/globe select signal input terminal

3 APCREF APC reference voltage input terminal 35 N Ft EC Record/playback select signal input terminal
4 TEMPI N+ Temperature sensor amplifier + input terminal 36 NRFSTBY Standby control signal input terminal

5 TEM Pl N- Temperature sensor amplifier - input terminal 37 VCCZ Data siioe circuit Vcc terminal

6 TEMP Temperature sensor amplifier output terminal 38 PE FMS Data slice output terminal

7 TOFS Tracking off segimstment terminal 39 GND2 Data slice circuit ground terminal

8 TBAL Tracking balance adjustment terminal 40 PEFM Data slice level set terminal

9 TE Tracking error sigmfl output terminal 41 EFM | ND Data slice signal input terminal

10 NC Non connecfion 42 EFM | NS EFM system detection input terminal

1 1 CCRS Truck crossing circuit capac'nor connection terminal 43 OUTFi F EFM output terminal

1 2 TRCRS Trud< crossing output terminal 44 CHFAGC HF AGC capacitor connection terminal

1 3 FBAL Focus balance adflstment terminal 45 EQADJ EQ set terminal

14 FE Focus error signal output terminal 46 EQI N EQ input terminal

1 5 TGAIN TE amplifier gain adjustment terminal 47 ARFO RF amplifier output terminal

16 F0 F5 Focus offset adjustment terminal 48 SVREF Reference signal input terminal

17 AS Main beam optical amount harmony signal output terminal 49 VFlEF Reference signal output terminal

1 8 ASOFS AS offset adjustment terminal 50 RF1 RF1 signal input terminal

1 9 ASGAlN Main beam system amp gain admstment termina 51 RF2 RFZ signal input terminal

20 MON3T 3T envelope outpm terminal 52 SWMS Pit RF amplifier polarity set terminal
21 CEA Capacitor connection terminal lora'r envelope detection 53 B Main beam B 5gnal input termina
22 GND4 FEfI'E system ground terminal 54 A Main beam A signal input terminal
23 BDO AS dropout detection signal outly terminal 55 D Main beam final input terminal
24 CBDOG BDO detction capacitor connection terminal 56 C Main beam C signal input terminal
25 OFTR Off-track signal output 57 F Side beam F signal input terminal
25 CBDOP RFBDO detction capacitor connection terminal 53 E Side beam E signal input terminal

27 OFl'lN Oil-track error detection signal input terminal 59 VCCS APC circuit Voc terminal

28 OFTO Detection signal cum terminal for off-track error 60 LDON LD amplifier ON/OFF control signal input terminal
29 ADI P ADIP FM signal outfit terminal 61 LDO LD amplifier output terminal

30 G N D1 Ground terminal 62 APCPD+ Terminal of detection of optical amount of photo diode
31 NRFDET RF detection signal output terminal 63 APCPD- PD polarity reversing current input terminal
32 VCC1 Vcc terminal 64 E FIN APC amplifier reference voltage input terminal

2-50