JVC DR-E22BK Service Manual page 43

DR-E22BK
DR-E22LBK
(3) Here is a listing of the input/output and the control conditions for each board
1. Equalizer Board (Recording amp section: ENJ-004-1) >
High speed normal EQ Electronic switch input 5 V
High speed metal EO *
Low speed normal EQ
High speed metal EQ
R CH signal output
L CH signal output , : : ar wR
+B
L CH signal. input
[—eonwrot TO OOGD-Hpen
— 8.7 dB£1.5 dB —8.5 dB£1.5 dB —5.1 dB+1.5 dB —9.7 dB+1.5 dB —5.1 dBi1.5 dB
—9.7 dB£1.5 dB —9.5 dBt1.5 dB —6.1 dB+1.5 dB ~9.6 dB£1.5 dB ~6.0 dB+1.5 dB
Gan bv Deny sv
— 8.6 dB+1.5 dB — 7.5 dB+£1.5 dB — 2.6 dB+1.5 dB —2.8 dB+£1.5 dB —3.0 dB+1.5 dB
—8.7 dB£1.5 dB —8.5 dBt1.5 dB —5.1 dB£1.5 dB -9.7 dB£1.5 dB —5.1 dB+1.5 dB
~9.7 dB+1.5 dB ~9.5 dB+1.5 dB —6.1 dB+1.5 dB ~9.6 dB+1.5 dB —6.0 dB+1.5 dB
10 kHz — 8.6 dBt1.5 dB —7.5 dB+£1.5 dB ~ 2.6 dB+1.5 dB "2.8 dB+1.5 dB
~3.0 dB+1.5 dB
Note: (1) 10 kohms inserted in series with the signal source for the input pins.
(2) The output voltage has.a reference value of — 20 dbs and the load resistance for the output pins is 1 kohm.
2. Equalizer Board (Replay amp section: ENJ-004-2)
|____Pin Function Remarks
For B mechanism input
B mechanism R CH head input
B mechanism L CH head input
Electronic switch input
(shorted to ground)
+B
A mechanism R CH EQ output
A mechanism L CH EQ output
A mechanism low speed EQ Electronic switch input ;
(shorted to ground) :!
A mechanism norma! EQ Electronic switch input Fe
(shorted to ground)
A mechanism R CH head. input
For A mechanism input
Control @) G2 -Open @)-Open @-GND @)-GND, (-Open @),42-GND
; 100 Hz 57.0 dB+2 dB - = met
in @®
1kH 39.0 dB42 dB - eae, =
OUT @) ee
10 kHz 27.0 dB+2 dB 31.0 dBi2 dB 32.0 dB+2 dB 37.0 dB+2 dB
100 H 57.0 dB+2 dB _ — a
in ef
1kH 39.0 dB+2 dB — = oe
OUT
10 kHz 27.0 dB+2 dB 31.0 dBi2 dB 32.0 dB+2 dB 37.0 dBi2 dB
Control | @)Open @)GND
in 100 Hz | 57.0 dB+2 dB - Notes: %
out G) | 1 kHz 40.0 dB+2 dB (1) The output voltage has a reference value of — 20 dB and '
10 kHz 32.0 dBt2 dB | 37.0 dB+2 dB the load resistance for the output pins is 10 kohm.
a @ 100 Hz i 57.0 dBi2 dB an (2) Adjustment controls are preset to the middle positions
+
out © 100 Hz
40.0 dB+2 dB
m=
* Reference values .... the range of variation for the
[1 kHz 32.0 dBL2 dB 37.0 dBt2 dB adjustments is about 11 dB.