JVC RC-QC7 Service Manual page 37

| RC-QC7 B/E/EN/G
Electrical Performance
Measurement
tems conditions Measurement method
: Both recording and @ After resetting the [PAUSE] mode, start
headphone terminals recording. At this time, adjust VR101 for LcH
and VR201 for RcH so that the recording bias
current values become 4.0 p A(TYP I )and
4.20 WA(TYPT).
Standard Adjusting
values positions
TYP II ,adjust VR101 for LcH and VR 201 for
RcH so that the output deviation between 1kHz
and 10kHz becomes - 1dB + 2dB.
li Reference Values for Electrical Function Confirmation Items
@ While changing over to and from BIAS 1 and 2, 100kHz
+ 6kHz
Recording
bias frequency
+ Recording and
playback side forward or
reverse
* Test tape
: TYP: AC-514
* Measurement
terminal: BIAS TP on
P.C. board
confirm that the frequency is changed.
@® With the recording and playback mechanism,
load the test tape (AC-514 to TYP Il), and set
the mechanism to the recording and pausing
conditions in advance.
@ Confirm that the BIAS TP frequency on the P.C.
board is 100kHz + 6kHz.
+ Recording mode recording and pausing conditions in advance. :75mA
@ After setting to the recording conditions, connect
1W in series to the eraser head on the recording
and playback mechanism side, and measure the
eraser current from both of the eraser terminals.
* Test tape
: AC-514 and AC- 225
Measurement terminal:
Both of the eraser head
(No.10036) 37