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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.
 ;
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.
3-1
3-1
SERVICE TEST PROGRAM I
To start service test program hold DISC1 & STANDBY-ON buttons depressed while plugging in the mains cord*
* Hold till the Display is shown
Display shows the ROM version "S-Vyy"
S refers to Service Mode V refers to Version yy refers to Software version number of the uProcessor (counting up from 01 to 99)
MAIN MENU ADC TEST
SEATING Button pressed? Y 9 Button pressed? N Y N
TUNER TEST
TUNING Button pressed? Y Display Tuner Version "ccc" N
QUARTZ TEST
CLOCK-TIMER Button pressed? Y Display shows 32K Output at (Front Board) pin 19 of uP = 2048Hz N N
DISPLAY TEST
BII Button pressed? Y Display shows Figure 1 and Standby LED is Green Figure 1 N
Display shows "ADC Value" (Ref Table 1)
TUNING Button pressed? Y
CLOCK-TIMER Button pressed? Y
N
BII Button pressed? Y
N
Has it reach "ADC5 Value" ? N
Y
Service frequencies are copied to the RAM (see Table 2) Tuner works normally except: PROGRAM button
Display shows 12M Output at (Front Board) pin 19 of uP = 2,929.6875Hz
Display shows Figure 2 and Standby LED is RED
Disconnect Mains cord ? N Y
N
SEATING Button pressed?
9 Button pressed?
N
9 Button pressed? Y
N
Figure 2
Y
Service Mode left
Y
Display shows next "ADC Value" (Refer Table 1)
Various other Tests
PRESET 1 2
Name Input line to uProcessor IC Key0 Key1 VU_IN MUX_DET Options Remarks
Europe "EUR" 87.5MHz 108MHz 531kHz 1602kHz 558kHz 1494kHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz 98MHz
USA "USA" 87.5MHz 108MHz 530kHz 1700kHz 560kHz 1500kHz 98MHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz
Oversea "OSE" 87.5MHz 108MHz 530/531kHz* 1700/1602kHz* 560/558kHz* 1500/1494kHz* 98/87.5MHz* 87.5MHz 87.5MHz 87.5MHz 87.5/98MHz*
East Europe "EAS" 87.5MHz 108MHz 531kHz 1602kHz 558kHz 1494kHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz 98MHz
East Eur. Extended-band "EAS" 65.81MHz 108MHz 74MHz 87.5MHz 531kHz 1602kHz 558kHz 1494kHz 98MHz 70.01MHz 65.81MHz
LEAVE SERVICE TEST PROGRAM Disconnect mains cord ROTARY ENCODER TEST SOURCE / VOLUME Knob AUTO STANDBY TOGGLE SUBW + (Remote Control) EEPROM FORMAT TEST EEPROM TEST T Some test patterns will be sent to the EEPROM. "PASS" is displayed if the uProcessor read back the test patterns correctly, otherwise "FAIL" will be displayed. Load default data. Display shows "NEW" for 1 second. Caution! All presets from the customer will be lost!! Pressing this button will toggle between the status "AUTO STANDBY ON" and "AUTO STANDBY OFF". The status will scroll once across the Display. Display increases or decreases in steps of 1 until Values shows value for 2 seconds. 0 (Min.) or 40 (Max.) is reached.
TEST
Activated with
ACTION
3 4 5
ADC1 ADC2 ADC3 ADC4
Return the value assign for each key button. Return the value assign for each key button.
9 to Exit S
6
Varies according to the signal dc level
7
The set temperature is measured via this NTC line, if lower than 69 the set goes into Standby. Return the value assign for the different possible options
8 9 10
ADC5
Table 1
Note: ADC Test is used for checking the ADC inputs to the microprocessor. The display shows an ADC value between 0 and 255 for an input signal between 0 and 5V.
11
Table 2
Note: * Depending on the selected grid frequency (9 or 10kHz). By holding the "DISC5" and "STANDBY-ON" buttons depressed while switching on the Mains supply, one of the undermentioned features will be activated: - the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/21) version.
5DTC MX.. Range Service Test Program dd wk0302
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