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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.
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Mi spiace per non poter scrivere in inglese... ma sono veramente soddisfatto del servizio offerto. Grazie..!!
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The quality of this manual is good. It has all schematics and setup information for both the MDS-B3 and the MDS-B4. The scan quality is quite good, all pages are readable, This service manual also contains scans of the operating instructions from the User manual.
CIRCUIT DESCRIPTION
Setting the batteries or AC adaptor (see figure 7) When setting the batteries or AC adaptor, the voltage VDD2 is always applied to RAM and CPU since Q6 and IC5 are turned on. Power on sequence (see figure 7) When the power switch is turned on, PON signal is being H (PON = VDD2). CPU knows to turn the power switch on, it provides H from VCON terminal to base of transistor Q4. Then both transistors Q4 and Q3 are turned on, the voltage VDD1 is applied to all devices. Power off sequence (see figure 7) When the power switch is turned off, POFF signal is being H(POFF= VDD2). CPU knows to turn the power switch off, VCON signal and base of Q4 will be L. Then both transistors Q4 and Q3 are turned off, Q3 stops to supply the voltage VDD1. Power down sequence (see figure 7) If the voltage across the batteries lowers and the terminal DPW of CPU comes less than 4.5V, VCON signal is L. Then both transistors Q4 and Q3 are turned off, Q3 stops to provide the voltage VDD1. Print sequence (see figure 7) When the PRINT button is pressed, TCON signal is H. Then both transistors Q2 and Q1 are turned on, the voltage VP for printing will be 9V.
Q1 Fuse
8.6V 8.8V 8.4V 0V 8.6V 8.8V 0V 0V 5.0V 4.8V
IC5
5.0V 4.8V
VP (+9 V) VDD2 (+5 V)
Q3
4.8V 0V
8.4~0V 8.4~0V
VDD1 (+5 V)
+
8.6V 8.8V 0V 0V 0V 0V
4.2V 4.8V
+
0V 4.8V 4.8V 0V
Q2
Q4
0V 0V
GND
VDD1
VCON DPW IC1 PON VDE TCON ON POFF
CPU
OFF
Power Switch Note : The voltages around transistors mean as follows; Upper figure : Power ON at no operation. Lower figure : Power OFF. Figure-7
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