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There are currently no product reviews.
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Great PDF easy to read good info needed for replacment of belts and assembly and specs.
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complete and unabridged very good quality
easy to download.
recieved in two days.
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Awesome manual. Complete diagrams of all board assemblies as well as how to get to each part of the t.v. down to the individual screws and their locations. Get it.
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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.
ADJUSTMENT
A MAIN C.B
2
5
SFR 251
7
TP1(DET) TP3(FM IF) VR101 TP4(VT) VOLUME
L201
IC251
12
12 8
SFR 401
7
TP2(VCO)
L253 TC251
7
(GND)
TC202
1
PHONES
8
J101
L251 BAR ANT
5
3
4
6
2
<RADIO SECTION>
<TAPE PLAYER SECTION>
1. AM IF Adjustment 8. Tape Speed Adjustment L253 ....................................................................... 450kHz Settings : � Test tape : TTA�100 � Test point : Phones Jack (J101) 2. FM IF Adjustment � Adjustment location : SFR401 TC202 ............................................................... 10.70MHz � Volume : MAX � DSL : OFF 3. AM VT Check � Tape selector : Normal Settings : � Test point : TP4 (VT) Method : Play back the test tape and adjust SFR401 for Method : Set to AM 531kHz and check that the test 3015 ± 10Hz (FWD) and ± 45 (REV). point is 1.3V ± 0.3V. Then set to AM 1602 Then confirm WOW is less than 0.50%. kHz and check that the test point is less than 11V. 4. FM VT Adjustment Settings : � Test point : TP4 (VT) Method : Set to FM 87.5MHz and check that the test point voltage is 3.45V ± 0.55V. Then set to FM 108.0MHz and check that the test point voltage is less than 11V. 5. AM Tracking Adjustment L251 ....................................................................... 630kHz TC251 .................................................................. 1440kHz 6. FM Tracking Adjustment L201 .................................................................... 87.5MHz 7. FM VCO Adjustment Settings : � Adjustment location : SFR251 � Test point : TP2 (VCO) Method : Connect a frequency counter to pin 12 of IC251. Adjust SFR251 such that the frequency counter indicates 19kHz ± 100Hz.
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