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There are currently no product reviews.
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perfect copy, im very satisfied, i was need the diagram over the powersupply and
the copy was very sharp
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This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
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IF PRINTED CIRQUIT BOARD WIRING VIEW WAS ONE TONE LIGHTER, THEN 5 STAR RANK HAS TO BE MY CHOISE.
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Very usefull, good quality drawings !
Muito útil encontrei todas as informações necessárias.
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Wanting to repair a neighbours tape recorder I needed the necessary information, it makes it easier. Although the service manual is described as "Language : English" To my dismay I found that it is entirely written in German, a language I do not understand. At least I now have the schematics which will help of sorts. I may not use this service again due to the laguage difficulty after all when it states English you do not expect it to be entirely in another language.
5. DC BALANCE CHECK (FM) Requirement Measuring equipment: Digital multi-meter Test point: TP2, 3 (1) Adjust the reception frequency of the main unit to 98.0MHz. (2) Check that the test point voltage difference between TP2 and TP3 is 0mV±500mV.
TP GND
DIGITAL MULTIMETER V
<LW / MW ADJUSTMENT> For LW / MW adjustment, do wiring and connection as in the following.
60cm
Standerd Signal Generaor
SET TP Lch Rch GND
Connect to the respective measuring equipment
6. IF ADJUSTMENT (MW) Requirement Measuring equipment: Oscilloscope or Millivoltmeter Test point: TP8(Lch), TP9(Rch), GND Adjustment point: L802 (1) Adjust the setting of Standard Signal Generator (hereinafter S.S.G.) to 999kHz of 30% variation. (2) Adjust the receiving frequency of the main unit at 999kHz. (3) While looking at the waveform on the oscilloscope, reduce the output level all the way (till a certain degree of is monitored through the oscilloscope). (4) Adjust L802 until the waveform of the oscilloscope reaches the maximum. 7. TRACKING ADJUSTMENT (MW) Requirement Measuring equipment: Millivoltmeter Test point: TP8(Lch), TP9(Rch), GND Adjustment point: L952, L953 (1) Adjust the S.S.G. setting to 999kHz of 30% variation and reduce the output level all the way (till a certain degree of is monitored through the oscilloscope). (2) Adjust the reception frequency of the main unit to 999kHz. (3) Adjust L952 until the value of the millivoltmeter reaches the maximum. (4) Adjust the S.S.G. setting to 603kHz of 30% variation and reduce the output level all the way (till a certain degree of is monitored through the oscilloscope). (5) Adjust the reception frequency of the main unit to 603kHz. (6) Adjust L953 until the value of the milivoltmeter reaches the maximum. (7) Repeat the adjustment 2 or 3 times from step 1 to 6 above.
OSCILLOSCOPE
CH1
CH2
GND
Lch Rch GND
AC MILLIVOLTMETER
TP8
GND
CH1
CH2
GND
TP9
� 44 �
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