Harman Kardon CD491 - Controls and Functions - Part 2; PLAY BUTTON (PLAY); STOP BUTTON (STOP); RECORD BUTTON (RECORD)

ALIGNMENT PROCEDURES (REFER TO PAGES 29 AND 30)
= ELECTRICAL ADJUSTMENT
1. Before adjustment
@ After the power switch is pushed on, wait for 10
minutes before measuring to be sure of the most
stable operation.
@ Since head magnetization, dust accumulations, etc.
are likely to introduce errors in the various charac-
teristics, it is very important that the heads are
properly demagnetized and cleaned before
commencing any adjustment, particularly frequen-
cy response and head azimuth adjustment.
2. INSTRUMENTS REQUIRED
@ Low frequency oscillator
AC VTVM or dual channel AC VTVM
Oscilloscope
3. TEST TAPE
© Azimuth adjustment .........025- MTT-114
© Tape speed adjustment . . MTT-111 or MTT-111D
© Playback amp, level adjustment ........ 0000.
erie aicntenatceart yack hear MTT-150 or TCC-130
© Playback frequency characteristic confirmation
ehh PUA deg ban Me TCC-162C and TCC-262C
© Auto search adjustment ........... MTT-150.
© Auto search confirmation......... MTT-250B
Reference tapes
LN... XL-1
CrO2 AC-512
Metal . AC-711
Note:
C-90 differs with C-60 in the thickness and bias is
unequal, so adjust with the tape whose bias is of
.
e
© Wow/flutter meter
@ Frequency counter
specified value.
; VIVM ? “TP5O1 or
Aaimatty Test tape (MTT-114) | PB TP502
Frequency counter
Tape speed Test tape (MTT-111 PB aeeoL or
or MTT-111D)
viv
Playboy am: Test tape (MTT-150 PB pee
or TCC-130)
Playback frequeney viv
ic Test tape (TCC-162C
“i and TCC-262C) Fe CINE‘OUTRUT:
viv
Auto search Yor oeimTt-i6o) | PB 1P751
‘Auto search
ile eae Test tape (MTT-250B)
TP203
REC.
Step up trans. viv ie aay
F REC- 7P201
Bias trap vtvM re Teoh
7P203
TP204
Bias level REC. TP203
(Pre-adjustment) NIV PAUSE TP204
TP203
TP204
Bias frequency REC.
Bi frequen Frequency counter Bas TP251
atcag ioe 7) RECIPE ‘Apply 400Hz signal to LINE INPUT, Set REC TpeOi
(Pre-adjustment) Blank tape (AC-512) OE Ta RUC eee TP5O2
ae : Apply 27kHz signal to LINE INPUT. Set REC
Venicing coll vtvM Lara LEVEL knob so that TP101 and TP102 voltage eae
i is S80mV —26dB in REC-PAUSE mode.
LINE OUTPUT
viv Apply 400Hz signal to LINE INPUT. Set REC
Berea ence Blank tapes RECIPE LEVEL knob so that TP561 and TP562 voltage
ecrusiizs metal AC-711 is 580mV ~26dB in REC-PAUSE mode. LINE OUTPUT
paver CrO2 AC-512 Then adjust with a 20Hz to 30kHz sweep
characteristic ord oa vacate
‘ LINE OUTPUT