JVC DR-E34BK User Manual

DR-E34BK I
DR-E34LBK _ _
Adjustment Procedures (Cassette Deck)
(1) Measuring instruments necessary for Adjustment
1.
2.
3.
4.
Low frequency oscillator (Output of 0dbs should be
obtain at the 600 ohm terminal at a frequency of SO Hz
-20kHz)
Attenuator (600 ohm impedance)
Electric voltmeter
STANDARD TAPES
VTT-703L{for head azimuth ad j ustment)
VTT-712 (for tape speed, wow & flutter)
VTT-724 (standard level)
5.
6.
7.
8.
9.
(2) Adjustment and repairing the mechanism
Recording standard tapes
AC-513 (CrO2), TS-5 (SF) or equlvalent. (Use the standard
tape specified by JVC Audi o Divis io n)
600-ohm impedance (fo r attenuator matching)
Distortion factor meter (bandpass filte r)
Torq
ue gauge: CTG-N (cassette type )
C-120
tape ( for checking t he tape running)
(Adjust and check the mechanism before adjust i ng t he electric circuit)
Item Adjustment method
Standard
value
Remarks
Adjusting 1.
Connect
the output from the SPK OUT terminal
1)
When the specified cha racte ristic
azimuth of to the voltrneter.(At about 1 volt)
can no t be obt.iined because of
rec/play head 2. Play back VTT-703L
head wear , cut wire. exciessive
magnetizat ion, etc., repldce the
A mechanism
3. Adjust screw A so that the output of the
head and adjust the head az im uth .
~
voltmeter becomes maximum when PLAY ►) is Maximum
Also, perform t he adjustment of
pressed.
the pla yb ack level, recordi ng bias
current . recor ding level. etc.
1
(+)l
2) When there is the di ff erence of
4. Paint screw A and B with screw locking compound so they do not
more than 3 - 4 dB between left
and right output levels, replace the
a) come loose after adjustment.
head to avoid comp l aints .
B mechanism
5.
Adjust screw A so that the output of the
voltmeter becomes maximum when PLAY
Maximum
~
( ►) is pressed.
6. Adjust screw B so that the output of the
voltmeter becomes maximum when PLAY Maximum
(◄ is pressed.
A
B
7.
Paint screws A and B with screw l ocking ' compound so they
do not come loose after adjustment.
Playback torque
Measure the torque in the playback mode using 30 - 65 g-cm
When the st andard torque cannot be
the torque measurement cassette CTG-N.
obtained, clean or replace t he take-
up disc assembly.
Fast
forward Measure the torque in the fast forward mode 75- 1309- cm
When the standa rd torq ue cannot be
torque by the same procedure.
obtained,
1) C lean the capstan belt, rim of the
f ly -w hee l. moto r pulley, etc.
2) Change
the belt, idler, etc.
Rewind t orqu e
Measure the torque in the rewind mode by th e
75- 130 g-cm
When the standard torque cannot be
same
procedure.
obtained, cle ar . t he motor pulley.
capstan, rim of ue fly-wheel. rim of
the supply reel disc, etc.
Wow & ·flutter
Play back VTT-712 and attach the wow & flutter
As a comp l aint may occur if the wow
meter to the SPK . OUT terminals of this unit;
& flutter ftu ctuates by 0.1 % even
its reading should be within 0.16% (WRMS).
thoug h it is allowed in the standard,
repair i ng is requi red.
1-26 (No. 20162)
www.audiodna.sk

JVC DR-E34BK Specifications

General

Brand	JVC
Model	DR-E34BK
Category	Car Receiver
Language	English