Erase Current Confirmation; Playback Frequency Response Check - Technics RS-DV290EG Service Manual

[Standard value:265 mV ~ 300
13.6. Erase current confirmation (Deck 2)
1. Connect the measuring instrument as shown in
2. Insert the blank tape into Deck 2, and press the Record pause
button.
3. Check if the output at this time between the erase current
confirmation point TP301 and TP302 (the output on both edged of
R313) is within the standard value shown below. (For the erase
current confirmation point, referto
Standard Value
85 ± 25 mA (85 ± 25 mV)
Normal tape
:
150 ± 25 mA
CrO2 tape:
185 ± 25 mA
Metal tape:
Note:
The test tape is not required when confirming the erase current.
13.7. Playback frequency response check (Deck 1/2)
1. Connect the measuring instrument as shown in
2. Playback the 315 Hz, -20 dB and 12.5 kHz to 63 Hz, -20 dB sections
of test tape (QZZCFM) and then, using the 315 Hz, -20 dB playback
mV]
Fig. 13-4.
EVM reading
(150 ± 25
mV)
(185 ± 25
mV)
Fig. 13-5.
23
Fig. 13-5.
Fig. 13-11. )
Fig. 13-6.