Pioneer CT-05 Service Manual page 6

12.2.4 Playback Level Adjustment
(Deck A and Deck B)
Since this adjustment determines the DOLBY
NR level during playback, it should be performed
precisely.
Settings
AC mV meter ....... Connect to TP1 (L ch) and
TP2 (R ch)
Test tape .......... STD-341A (333Hz, O0dB)
Tape selector ....... NORM
Mode ............. Play back
"
@ renter ie
P8 head
OUTPUT
P| ae a
TP2(Ach)
—1.2dBv(87imV)
Fig. 12-14 Playback level adjustment
Procedure
Adjust VR102 (L ch) and VR202 (R ch) on
deck A and VR3801 (L ch) and VR401 on deck B
so that the AC mV meter reads -1.2dBv (871mV).
12.2.5 Level Meter Check (Deck B)
Settings
AC mV meter....... Connect to TP1 (L ch) and
TP2 (R ch)
Input signal ........ 333Hz, -10dBv (316mV)
to INPUT terminals
Mode ............. Record
of ae
Level meter check,
e Segments' | light up
in 0d8_-—
REC
Ter(Leh) db
TP2(Ach)
Fig. 12-15 Level meter check
Procedure
Adjust the input level control so that the AC
mV meter reads -5.2dBv *$'°dB and check that
the level meter segments light up to indicate OdB.
56
12.2.6 Record/Playback Frequency Response
Adjustment (Deck B)
Settings
AC mV meter ....... Connect to OUTPUT ter-
minals
Input signal ........ 333Hz, - 30dBv (31.6mV)
to LINE INPUT terminals
Test tape .......... STD-608A (STD-608,
STD-604)
Tape selector ....... NORM (CrO,, METAL)
Mode ............. Record
TPt(Len)
TP2(Rch)
6.3kHz
—30d8v
(3t.6mv)
TPI(Len)
TP2(Ach)
6.3kHz jevel — 333Hz level = +1.5dB
Fig. 12-16 Record/playback frequency response adjustment
Procedure
1. Adjust the INPUT level control so that the
meter reads - 25.2dBv (54.9mV).
2. Record the 3833Hz, -30dBv and 6.3kHz,
- 80dBv signals, and adjust VR303 (L ch) and
VR403 (R ch) so that the difference in the
playback output signal level with the 333Hz
level as the reference level is +1.5dB.
3. Change the tape selector and DOLBY NR
switch positions (See Fig. 12-17), and check
that the frequency response is satisfactory.