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The purchased manual is an high-quality scan of the original JVC paper-based Service Manual. The Service Manual includes the Owner´s Manual, so you do not have to buy both of them.
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It paid to find this Service Manual, couldn't find it anywhere else. Exactly what I wanted. Received within 24 hours.
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Complete manual with clear schematic diagrams and printed circuit board layouts of two variants of the headset and the transmitter an old and a new version.
Also shows how the headset and the transmitter is opened and how transmitter and receivers can be adjusted and where to measure.
I had no problems to repair the headset using this service manual.
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Excellent printing quality. A complete and very useful manual with all details.
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This is a great site. I placed my order and by the next am it was available for download. Had some problems with some missing copy on some pages. Once I brought the error to the OMC's attention, the issue was resolved. I'll come back again.
Touch current check
(After completing the work, measure touch current to prevent an electric shock.) �Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check..
�Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure D.1
�The potential at any point(TOUCH CURRENT) expressed as voltage U1 and U2 does not exceed the following value:
The part or contact of a TERMINAL is not HAZARDOUS LIVE if: a) the open-circuit voltage does not exceed 35 V (peak) a.c or 60 V d.c., or,if a)is not met, b) the measurement of the TOUCH-CURRENT shall be carried out in accordance with IEC 60990, with the measuring network described in annex D of this standard. The TOUCH CURRENT expressed as voltages U1 and U2, does not exceed the following values: - for a.c.:U1= 35 V(peak)and U2=0.35 V (perk); - for d.c.:U1= 1,0 V, NOTE 5 -The limit values of U2=0.35 V (peak) for a.c. and U1=1.0 V for d.c. correspond, to the values 0,7mA (peak) a.c. and 2,0 mA 2,0mA d.c. The limit value U1= 35 V (peak) for a.c. corresponds to the value 70mA (peak) a.c. for frequencies greater than 100 kHz.
Annex D (normative) Measuring network for TOUCH CURRENTS
A
Test TERMINALS
Rs= 1 500Ω
Cs= 0.22uF 10kΩ
B
Rb = 500Ω
U1
0.022uF
V
U 2 (V)
IEC 802/96
Resistance values in ohms(Ω) V: Voltmeter or oscilloscope (r.m.s or peak reading) Input resistance: �1 MΩ Input capacitance: � 200 pF Frequency range: 15 Hz to 1 MHz and d.c. respectively NOTE-Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms. The measuring instrument is calibrated by comparing the frequency factor of U2 with the solid line in figure F.2 of IEC 60990 at various frequencies. A calibration curve is constructed showing the deviation of U2 from the ideal curve as a function of frequency. TOUCH CURRENT=U2/500(peak value)
Fig.D.1
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