Technics RS-TR474 Service Manual page 19

| RS-TR4;
HWRITING TO EEPROM __.
Since it hardly breaks down, there will scarcely occur such a trouble as to require replacement.
Measurement Condition
¢ Recording-level control; Maximum * Make sure heads are clean
e Reverse-mode selector switch; = ; ¢ Judgeable room temperature 20+5°C (68+9°F)
¢ Tape-to-tape recording-speed switch; Off :
¢ Dolby NR switch; Off
¢ ATC switch; Off
Measuring instrument
e EVM (Electronic Voltmeter) ¢ ATT (Attenuator)
¢ Oscilloscope ¢ Resistor (600Q)
° AF oscillator : ;
NOTE: Before adjustment, be sure to set the AF oscillator output level to OdB (1kHz): 1V
Test tape es
¢ Playback gain adjustment (315Hz, 0dB); QZZCFM ...
* Overall gain adjustment and Overall} frequency response
Normal reference blank tape; QZZCRA
CrO, reference blank tape; QZZCRX1
Metal reference blank tape; QZZCRZ5
NOTE: Step 1 to step 7 only has to be done after exchange of the EEPROM.
Short the Test Mode terminals with a shorting clip.
Step 1
OPERATION PC.B.
Step 2 While holding down the STOP button on DECK2, press the POWER Y
Pp :
switch to ON.
All FL display segments except for the four-digit counter on DECK2 Short Clip
will start blinking to indicate that the deck has entered Write mode.
At this point the four-digit counter will indicate "OQ-k".
Step 3
Notes:
* The test mode terminals
on main P.C.B. should be
shorted with a short clip
as shown above figure.
« After the adjustment
items disconnect the
short clip.