Nakamichi T-100 User manual

NAKA-00088
Service Manual
Nakamichi
Nakamichi
T-100
Audio Analyzer

CONTENTS
1.
2.
bd
VW.
GOTOF AD ss 5.06%, aie Shales cele race saya laeyiat bumps: by inca BoB acate Kekied Gea yare Javaliphere © elepdl Guacatte @ists Sawicwteee 2
Wo 1, Control Functions ........ 2
Va. :2, Voltage Selector.......... 3
1, 3. Functions ..........-.-5 3
1. 4, How To Read Signals 5
1.°¢5. Semiconductor Switch 5
Removal Procedures .. 1.2200. eee ee cee reer cece eee eee ee eee tee tent eee e renee 6
2. 12 Top Cover Ass’y, Bottom Cover Ass’y and Synthesis Mechanism Ass’y with Power Supply Ass’y... 6
2. 2. Power SUPPIV ASS Vi? 5.22850 hissed LORS hs ad tate See teig oe Wit eset Ss ent Eee Bee Be dk ede 7
2 3. Connector P.C.B. Ass’y «0. ee ee eee eee 7
2. 4. Switch Control Ass’y and Bar-graph Holder Ass’y . . 7
2. 5. GP Pin Jack Ass’y 2... eee cee eee 7
2 6. Switch P.C.B. Ass’y and Votume P.C.B. Ass'y 2... cee cee ee ete eee en neee 8
2 7. Display P.C.B. Ass’y and Bar-graph 2... ce cee eee ett eee et neee 9
2 8, Power Supply P.C.B. Ass‘y and Power Transformer . 10
2 9. Rear Panel A Ass'y, Power Switch and AC Inlet... 10
Measurement Instruments .. 20... 0000 v eee eee e renee 10
Parts Location for Electrical Adjustment............... 11
44, CUrrent TY Pe accede ee See eee ee ea 1
4. 2, Previous Type ........ 2. eee eee eee eens 11
Adjustment and Measurement Instructions ..........-..,0000- staat 12
5. 1. Current Type.............08 See ODE ae tein & foe Sab Sande diby skater ere iececaueuhw sara rapsress abate cates 12
5, 2, Previous Type»... eee ee eee eee eee 15
Mounting Diagrams, Circuit Diagrams and Parts List 18
6. 1 IC Block Diagrams 18
6 2 Connector P.C.B. Ass’y 19
6 3. Power Supply P.C.B. Ass’y 21
6 4, Wow & Flutter P.C.B. Ass’y .. 23
6, 5, Switch P.CB.Ass’y.. ce eee cette ee ete nent cette emcee tense tee tn nee 25
6. 6 Oscillator 'P.C:B.:Ass’yoss.i.3 eccd ioe de ey eee bie ea ene eee ee ne 25
6. 7. Absolute Rectifier P.C.B. Ass’y .. 2.22.20 0.05 : esa eh
6. 8 Linear/Log. Converter P.C.B. Ass’y Bila ghd 29
6 9. Distortion P.C.B. Ass’y 1... eee eee eee Setiexionpe: 2Ot
B20Os” “Noltitne PiC.B Ass! y se asscz-es seis as ee setcatee ceraeetarsactes Sie re eran el natin Zoe Se halon Se nl tne Se ed “awd arated 33
6. 11. IHF-A WTD Network P.C.B. Assy 35
€ 12. Display P.C.B, Ass’y 37
6 13. Analog Multiplier P.C.B. Ass’y 39
Mechanism Ass’y and Parts List... 2.2... 0. cece eee eee ee eee eee 41
as OV SV MUESIS A350 cea wand rated cas int Diese ei Mees ne ar eles slsdeeted hap aoe aces Bb anata Nay Mian ore Sara Macavauehas anlar raneea 41
7. 2. Synthesis Mechanism Ass’'y {(AO1) 2... ce ce eee eee eee nee eee 42
7 3. Power Supply Ass‘y (A02) 43
7 4. Switch Control Ass’y (B01) 45
7 5. Bar-graph Holder:Ass’y: (BOQ)? seg 2-5, e-v ecesce womeeees dasha veteraereeraye re wos oe tebe validy dae Ae 46
7. 6. Connector Ass’y (B03) 47
Block Diagram ......., 48
Wiring Diagram ........ 49
Troubleshooting: ca teen he ie a eye eee ee Baik ea ce aresw ddd eased da febalra te 1a Ja Ranaehareialayalniinadereoe end ae lo 50
10. 1. Notes 50
10. 2. Troubleshooting . 50
Specifications 53

1. GENERAL
1.1, Control Functions
The Nakamichi T-100 control functions are shown below:
Peapennpriny
2 2 4
h Audio Analyzer T-100
Fig. 1.1 Front View
———— PLB. Assembly
Audio Analyzer T100
vel somone ! 4 i
Powar Consurmtion —1BVA W
ating Curt 190mA
1. Osellator 3. Wow/Flutter 8. Abs, Rovtitior 2. Log
2 WId-A Network — 4, Oistnrtion, 6. Ansley, Muttote: Converter
Mai in daoen
Fig. 1.2 Rear View
. Speed Deviation Scale
. Top Indicator
Level Scale
Bottom Indicator
Total Harmonic Distortion/
Wow & Flutter Scale
Speed Calibration Control
. Function Control
. Meter Range Switch
. Input Level Switch
10. Input Level Controls
11. Oscillator Control
12, Oscillator Output Control
13, Fuse Fig. 1.3 Side View (Right) Fig. 1.4 Side View (Left)
14, Power Switch
15. AC Cord Connector
16. Input Jacks
17. Oscillator Output Jacks
18. Scope Output Jacks
GQakONS
on
Inport fev ioiths Scope’
PS
-€
oO

1.2. Voltage Selector
Voltage selector is installed on the rear panel for Other
Version of the Nakamichi T-100.
This voltage selector can select either 120 V or 220 - 240
V at customer's disposal.
1.3. Functions
T-100 contains 9 functions the details of which are as
follows:
Figs. 1.5 - 1.13 show the signal path in each function.
(1) Speed Cal
Calibrates top indicator for zero speed deviation.
(2) Speed Unweighted
Selects speed deviation in the top indicator and unweight-
ed wow & flutter peak on the bottom indicator.
(3) Speed Wow/Fiutter
Selects speed deviation on the top indicator and weighted
wow & flutter peak on the bottom indicator.
{4) Level T.H. Distortion L
Selects left channel level on the top indicator and left
channel total harmonic distortion on the bottom indica-
tor,
SPEED CAL.
{5) Level T.H. Distortion R
Selects right channel Jevel on the top indicator and right
channel total harmonic distortion on the bottom indica-
tor.
(6) Level
Selects left channel level on the top indicator and right
channel level on the bottom indicator.
(7) Level —20 dB
Decreases oscillator output by 20 dB while simultaneously
making the indicators 20 dB more sensitive.
Selects left channel level on the top indicator and right
channel level on the bottom indicator.
(8) Noise -40 dB
Displays teft channel A-weighted noise on the top indica-
tor and right channel A-weighted noise on the bottom
indicator.
Makes the display 40 dB more sensitive.
Seope
woot = oT
Display
Speed
Pink }[_Sin_][nHz
Unweighted
Display
Speed
Weighted

{9) Peak
Selects peak-reading ballistics for the level display. Selects
left channel level on the top indicator, right channel level
on the bottom indicator. When the left and right input
level controls are turned to maximum, the sensitivity of
LEVEL T.H. DIST. L
Scope
Input ~ Lom
Input ~ RO
Ose
Outpur
the disptay is the same as when the function control is
set to “level”.
However, by turning the input level controls counter-
clockwise, you can reduce the sensitivity to any inter-
mediate value.
Distortion (L)
RH
Osc. 400 Hz eT
LEVEL T.H.DIST. &
Display
Level (R)
Distortion (R)
Input = Lo
Input = R
Scope
Input -L om
Input = R
{__ Display "J
Noise Level (L)
A =40 4B
Peak Level (L)
Ore
Output
Bink [Sin] [axes Speed
Ose
Fig. 1.12
PEAK LEVEL
Seape
lapu = ©
Input -
ee
Satpun
>
Peak Levet (R)
‘Speed

1.4. How To Read Signals
In the Switch P.C.B. circuit, preceding 9 functions are
symbolized as follows:
A: Speed Cat.
B: Speed Unweighted
C: Speed Wow/Flutter (DIN WTD)
OD: Level T.H. Dist. (400 Hz) L
E: Level T.H. Dist. (400 Hz) R
F: Level 0 dB
G: Level —20 dB
H: Noise IHF-A (—40 dB)
|: Peak Level
Functions A to | are combined and described logically
such as A+B+C, A+B +C, etc. The meaning of these
signals are:
A+B+C: will be “H” (i.e., will be effective) if
function A OR B OR C is selected.
A+B+C: will be “L” (ie., will be effective) if
function A OR B OR C is selected.
Notes: 1. If the function other than A, B, or C is select-
: ed, signals A + B + C and A + B + C become
open in the Switch P.C.B. circuit, but in the
next stage —10 V or +10 V bias is applied to
signal A + B + C or A+B +C. Thus, the “L”
or “H” level is obtained.
2. “H" and “L™ levels should be as follows:
“H": +6.5V—+10V
“LY: -10 V -—-7.5V
Fig. 1.14 shows the actual circuit.
Common terminal of the Function Switch is connected
to +10 V or —10 V and terminals A, B and C become
inputs of DIODE OR Gate.
1.5. Semiconductor Switch
Circuits are controlled by the semiconductor switch of
FET and transistor. Below shown is the table for the
semiconductor switch and equivalent mechanical switch.
c
yi
78
+10V
4
cad
Satie deat d
7
On
o%
Peeee a,
B
Xa ® coo
560
~10v = EO
\ Fo
§ %
Function Switch
—[S—
O A+Bt+C
Fig, 1.14
Table 1.1
Circuit
Mechanical
Switch
Control
Input
FET
Control fnput
|
Input Output High ON
(+10v) | eo
—
OFF
Low seg
{-10V)
Transistor
L Contro{ Input
{nput | ON
High
(+10V) eee 0
OFF
Low
(-10V) ae

2. REMOVAL PROCEDURES
2.1. Top Cover Ass’y, Bottom Cover Ass‘y and Synthesis
Mechanism Ass’y with Power Supply Ass’y
Refer to Fig. 2.1.
{1) Remove F01, F02 and FO3, then disassemble FO4
(Top Cover Ass’y) and F05 (Acrylic Cover).
(2) Remove FO6 and FO7, then disassemble F08 (Bottom
Cover Ass’y) and FO9 (Synthesis Mechanism Ass’y
with Power Supply Ass’y).

2.2. Power Supply Ass’y
Refer to Fig. 2.2.
(1)
(2)
(3)
Refer to Fig. 2.1. Remove Top Cover Ass’y and
Bottom Cover Ass‘y referring to item 2.1.
Remove F01, then disassemble FO2 (Power Supply
Box Cover).
Remove FO3, F04 and FO5, then disassemble FO6
(Power Supply Ass’y).
2.3. Connector P.C,B. Ass’y
Refer to Fig. 2.2.
(1)
(2)
(3)
Refer to Fig. 2.1. Remove Top Cover Ass’y and
Bottom Cover Ass’y referring to item 2.1,
Remove FO5 and FO7, then disassemble FO8 (Rear
Panel B Ass’y).
Remove FO9, then disassemble F10 (Connector P.C.B.
Ass’y).
F18
2.4.
Switch Control Ass’y and Bar-graph Holder Assy
Refer to Fig. 2.2.
(1)
(2)
(3)
Refer to Fig. 2.1. Remove Top Cover Ass'y and
Bottom Cover Ass‘y referring to item 2.1.
Remove F11, then disassemble F12 (Switch Control
Ass’y).
Remove F13, then disassemble F14 (Bar-graph
Holder Ass’y).
2.5. 6P Pin Jack Ass’y
Refer to Fig. 2.2.
{1}
(2)
Remove F10 (Connector P.C.B. Ass‘y) referring to
item 2.3.
Remove F15, then disassemble F16 (Shield Plate),
F17 (6P Pin Jack Ass’y} and F18 {Pin Jack Name
Plate).

2.6. Switch P.C.B, Ass’y and Volume P.C.B. Ass’y {5) Remove F08, then disassemble FO9 (Switch P.C.B.
Refer to Fig. 2.3. insulator), F10 (Wire Holder 583) and F11 (Switch
(1) Refer to Fig, 2.2. Remove Switch Control Ass’y P.C.B, Holder Ass’y).
referring to item 2.4. (6) Remove F12 and F13, then disassemble F14 (Switch
(2) Remove FO1, then disassemble FO2 (Rotary Switch P.C.B. Ass’y).
Knob Ass’y). {7) Remove F15, then disassemble F16 (Volume P.C.B.
(3) Pull out FO3 (Slide Switch Knob) and FOQ4 (Cali- Ass’y) and F17 (Switch Holder).
bration Knob).
Remove FO5, then disassemble FOG (Front Panel
Ass'y) and F07 (Front Panel Stud).
{4
Fig, 2.3

2.7. Display P.C.B. Ass‘y and Bar-graph
Refer to Fig, 2.4.
{1) Refer to Fig. 2.2. Remove Bar-graph Holder Ass’y
referring to item 2.4,
(2) Remove FO1, then disassemble FO2 (Shield Cover
Ass‘y}
{3) Remove FO3, then disassemble FO4 (Display P.C.B.
Ass’y) and F05 (Display P.C.B. Insulator).
(4) Remove FO6, then disassemble FO7 (Scale Panel
Ass’y).
{5} Remove FO8, then disassemble FO9 (8P Plug P.C.B.
Ass’y).
(6) Remove F10 and F11 (Pressure Plate Ass’y), then
disassemble F12 (Bar-graph) and F13 (Bar-graph
Holder Ass’y).
Fig. 2.4

NAKA-00088 / DRUCK 1
2.8. Power Supply P.C.B. Ass’y and Power Transformer
Refer to Fig. 2.5.
(1)
(2)
(3)
Refer to Fig. 2.2, Remove Power Supply Ass’y re-
ferring to item 2.2,
Remove FO1, then disassemble FO2 (Power Supply
P.C.B. Ass’y).
Remove F03 and F04, then disassemble FOS (Power
Transformer).
2.9. Rear Panel A Ass’y, Power Switch and AC Inlet
Refer to Fig. 2.5.
(1)
{2)
{3)
{4)
(5)
Fig. 2.5
10
Refer to Fig. 2.2, Remove Power Supply Ass’y re-
ferring to item 2.2.
Remove FO6 and FO7, then disassemble FO8 (Rear
Panel A Ass’y).
Remove FO9 and F10, then disassemble F11 (Power
Switch).
Remove F12 and F13, then disassemble F14 (Power
Supply Name Plate).
Remove F15 and F16 (Inlet Holder}, then disassem-
ble F17 {AC Inlet).
FO2
FO1
(i)
{2)
(3)
(4)
(5)
{6)
(7)
(8)
MEASUREMENT INSTRUMENTS
Oscillator 20 Hz — 20 kHz
Level Deviation:
Distortion:
Output Voltage:
VTVM
DC Voitmeter
Input Impedance:
Accuracy:
Resolving Ability:
Distortion Meter
Minimum Range:
Frequency:
Oscilloscope
Standard Distortion Generator
Fundamental Frequency:
Distortion Rate:
Output Voltage:
Standard Wow and Flutter Generator
Center Frequency:
Wow Frequency:
Wow:
Output Voltage:
Frequency Counter
+0.1 dB or less
0.1% or less
3.16 V or more
100 k-ohm or more
1% or less
0.1 mV or less
0.01% or less (at full-scale)
400 Hz
400 Hz
0.1%, 0.3%, 1%, 3%
3.16 V or more
3,000 Hz
4 Hz
1% (peak)
100 mV or more

4. PARTS LOCATION FOR ELECTRICAL ADJUSTMENT
4.1, Current Type
Note: In the current type, VR701 and VR801 on the Absolute Rectifier P.C.B. Ass’y are removed.
C
L
VR202
(R)
PEAK LEVEL
(VOLUME P.C.B.)
vRio2
tt)
m
C78
OSC. DIST.
OSC.OUTPUT LEVEL
VR302 VR301
1a = (OSCILLATOR P.C.8.)
WTO-A OUTPUT LEVEL
vR2ol
(IHF-A WTD
—————---—— NETWORK P.C.B.)
‘wo Ql»
UNWTD OUTPUT = W/F OUTPUT
LEVEL
SPEED -3%
LEVEL VR303 VR302
—— (WOW/FLUTTER PCB.)
VR304 (22 vra0s (@)
SPEEDt3%
DIST. OUTPUT LEVEL
FREQ. RESPONSE
VRB02
(DISTORTION P.C, 8.)
TP-R TPL
f ( ABSOLUTE
TEST FIN RECTIFIER P.C.8.)
MULTIPLIER OUTPUT MULTIPLIER MULTIPLIER
LEVEL OFFSET B OFFSETA
VR753 VR752 VR7SE
a ©
{ANALOG
MULTIPLIER P.C.8.)
LOG. DYNAMIC RANGE
VRIOF VR
BCICHARCICE
'
102 VRIO3 VR203 VR202 VR201
(LINEAR/LOG.
NAKA-00088 / DRUCK 2
LOG.OUTPUT
LEVEL
LOG. OFFSET
CONVERTER
PCB.)
CN-22
(CONNECTOR P.C.B.)
Fig. 4.1
BARGRAPH FULL SCALE
A
(DISPLAY P.C.B)
VR702 VR7OI
(SWITCH P.C.8.)
4.2, Previous Type
L_Sf
VR202
{R)
ve 301
OSC.FREQ
PEAK LEVEL
{VOLUME P.C.8)
vRiIO2
(kh)
cA
Osc, DIST.
C
oe a
WTD-A OUTPUT LEVEL
VRIOI vR20l
(u)
UNWTD OUTPUT W/F OUTPUT SPEED -3%
LEVEL LEVEL VR303 VR302
vasoa(@\@)veaos (2) _
SPEED+3%
OSC.OUTPUT LEVEL
VR30}
{OSCILLATOR P.C.B.)
(HFA WTO
<= NETWORK P.C.B.)
(WOW/ FLUTTER PC. B.)
FREQ. RESPONSE
io)
DIST. OUTPUT LEVEL
VRE02
(DISTORTION P.C. 8.)
ABS.OUTPUT LEVEL
TP-R TRLYRBO! VR7O1
\nne wy@ya\wu ( ABSOLUTE
alll nalas RECTIFIER P.C.6.)
TEST PIN
MULTIPLIER OUTPUT MULTIPLIER MULTIPLIER
LEVEL OFFSETS OFFSETA
VR753° VR7S2 VRT75I
(2) (ANALOG
¢ an MULTIPLIER P.C.8.)
LOG. DYNAMIC RANGE |
VRIO} VRIO2 VRIO3 VR203 VR202 VR201
CenaGe
(LINEAR/LOG, ow
r & Gs nol tf wl , CONVERTER me
[ Lor f PC.B. &
LOG. OFFSET
Fig. 4.2
11
(CONNECTOR P.C.B.)
BARGRAPH FULL SCALE
VR702 VR70)
eA
UDISPLAY P.C.6)
(SWITCH P.c.B.)

5. ADJUSTMENT AND MEASUREMENT INSTRUCTIONS
5.1. Current Type
Note: In the current type, absolute output fevel adjustment is removed.
SIGNAL SOURCE
OUTPUT CONNECTION MODE
ADJUSTMENT
REMARKS
Oscillator Frequency
Frequency Counter to
Oscillator
OUTPUT Jacks
Function — Level
Oscillator — 400 Hz
Meter Range — 1%
Input Level ~ 1 V
Speed Cail. VR — Not
specified
Input Level VR — Max.
Osc, Output VR — Max.
Switch P.C.B.
vc301
Adjust VC301 to obtain 400 Hz on the Frequency Counter,
Oscillator Distortion
Distortion Meter to
Oscillator
OUTPUT Jack
Function — T.H, Dist.
Meter Range — 1%
Input Level - 1V
Speed Cal. VR — Not
specified
Input Level VR ~ Max.
Osc. Output VR — Max.
Adjust VR302 to obtain 0.06% — 0.07% distortion.
Note: Connect an Oscilloscope to the Output of the Distortion Meter
and check to insure that no humming noise is included in the
signal.
Oscillator Output Level
Log. Output Level
VTVM to Oscillator
OUTPUT Jacks
Oscillator to
INPUT Jacks
Bargraph Full Scale
VC301 50P
€302
Fig. 5.1.1.
1. Oscillator Frequency
NAKA-00088 / DRUCK 3
Oscillator to
INPUT Jacks
R307
Fig, 5.1.2
2. Oscillator Distortion
12
DC Voltmeter to
CN22-1, CN22-2
Fig. 5.1.3
3. Oscillator Output Level
D102
Function — Level
Meter Range — 1%
Input Level - 1V
Speed Cal. VR — Not
specified
Input Level VR — Max.
Osc. Output VR — Max.
Adjust VR301 to obtain 1.2 V on the VTVM.
Function — Level
Meter Range ~ 1%
Input Level - 1 V
Speed Cal. VR — Not
specified
Input Level VR — Max.
Osc. Output VR — Max,
Function — Level
Meter Range — 1%
input Level — 1 V
Speed Cal. VR —. Not
specified
Input Level VR — Max.
Osc. Output VR — Max.
Qi05
KK) Sr VR103
Zz (VR203)
50K
Fig. 5.1.4
4, Log. Output Level
Linear/Log.
Converter P.C.B.
VR103, VR203
Feed in 1 kHz 1 V and adjust VR103 (VR203) to obtain 2.18 V on
the DC Voltmeter.
Display P.C.B.
VR701
Feed in 1 kHz 1 V and adjust VR701 so that the Bargraph indicates
0 dB.
Note: Adjust VR702 only if circuit is repaired.
Fig. 5.1.5
5. Bargraph Full Scale

STEP ITEM SIGNAL SOURCE OUTPUT CONNECTION MODE ADJUSTMENT REMARKS
4
Feed in 1 kHz +10 dB (3.16 V), 0 dB (7 V), -10 dB (316 mV), or
-20 dB (100 mV) and check whether the Bargraph indicates +10 dB,
O dB, -10 cB, or ~20 cB.
(Allowance of error is within +1 segment on the Bargraph.}
H above is not obtained perform the following steps:
. 1. Feed in +10 dB (3.16 V), and adjust VR103 for the left channel
Function — Level i and VR203 for the right channet to obtain +10 dB on the
Meter Range — 1% Linear/Log. Bargraph.
ae Input Level — 1V Converter P.C.B. 2. Feed in -10 dB (316 mV) and adjust VR102 for the left channel
0g. Output Level ‘Oscllidterte Speed Cal, VR — Not VR103, VR203 and VR202 for the right channel to obtain -10dB on the
6 Log. Dynamic Range INPUT Jacks specified VR102, VR202 Bargraph.
Log. Offset Input Level VR — Max. VR 101, VR201 3. Feed in -20 dB (100 mV) and adjust VR101 for the left channel
Osc. Output VR — Max. and VR201 for the right channel to obtain -20dB on the
Bargraph.
4. Repeat above steps 1 — 3.until the error between input level and
indicated value on the Bargraph becomes within +1 segment on
the Bargraph in each input level.
Function — Noise-A
(—40 dB)
ao hie range ae Volume P.C.B. Feed in 1 kHz 0 dB (1 V) and adjust VR102 (VR202) to obtain 0 dB
7 Peak Level Redo Seetd CALVRL& Not VR 102, VR202 on the Bargraph.
specified
Input Level VR — Max.
Osc. Output VR — Max.
Function — Level
Meter Range — 1%
ae ingat faa? 10V hoe pee : Feed in 1 kHz -20 dB (100 mV) and adjust VR101 (VR201} to
WTD-A Output Level scillator to BEWOFK Ts obtain 0 dB on the Bargraph.
. ae INPUT Jacks Speed Cal, VR ~ Not VR101, VR201
specified
Input Level VR — Max.
Ose. Output VR — Max.
Function — Wow/Flutter
Meter R -
F eter renga =: le 1. Feed in 2,910 Hz #1 Hz 1 V and adjust VR302 to obtain 3%
Oscillator and Input Level — 1V Wow/Flutter P.C.B. ed on the Bargraph
9 Speed Frequency Counter to Speed Cal, VR — Center VR302, VR303_ ween s ve ss :
. 2. Feed in 3,090 Hz +1 Hz 1 V and adjust VR303 to obtain +3%
INPUT Jacks (See note)
Input Level VR — Max, speed on the Bargraph.
Osc, Output VR — |
Function — Unweighted 1. Set the Standard Wow/Flutter Generator to the following modes:
Meter Range — 1% Center Frequency — 3 kHz
Sines oe ne Input Level — 1V Wow/Flutter P.C.B. Wow Frequency — 4 Hz
10 UNWTD Output Level inDUT pe Speed Cal. VR — Center VR304 Wow/Flutter — 1% (peak)
(See note) Output Level — 05to2V
Input Level VR — Max. 2. Adjust VR304 to obtain 1% wow/flutter on the Bargraph,
Osc. Output VR — Max,
Note: Turn the Speed Calibration Control fully counterclockwise, then turn it clockwise approximately 7-1/2 times to set the Control to the center position.
VR101 (VR201)
22K
Qi05 | R115
R1i0%
D102
Fig. 5.1.8
6. Log. Adjustment
Fig. 5.1.7
6. Log. Adjustment
Fig. 5.1.6
6. Log, Adjustment
NAKA-00088 / DRUCK 4
Fig. 5.1.9
7. Peak Level
poe
DIOS
Q103
R113
Fig. 5.1.10
8. WTD-A Output Level
VR101
o {VR201)
500
13

REMARKS
STEP ITEM SIGNAL SOURCE OUTPUT CONNECTION MODE ADJUSTMENT
Function — Wow/Flutter r
Meter Range — 1% 4. Set the Standard Wow/Flutter Generator to the following modes:
Center Frequency — 3 kHz
Input Level — 1 V
11 Wow/Flutter Standard Wow/Flutter Speed Cal. VR — Center Wow/Flutter P.C.B. Wow Frequency — 4 Hz
VR305 Wow/Flutter — 1% (peak)
Output Level
Generator to
INPUT Jacks
(See note)
Input Level VR — Max.
Osc. Output VR — Max.
Output Level -— 05to2V
. Adjust VR305 to obtain 1% wow/fiutter on the Bargraph.
Frequency Response
Oscillator and
Frequency Counter to
INPUT Jacks
VTVM to SCOPE
OUTPUT Jack
Function — T.H. Dist.
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Center
{See note)
Input Level VR — Max,
Osc. Output VR — Max.
Distortion P.C.B.
VR801, VR802
Feed in 2.5 kHz £10 Hz 100 mV and read the level on the VTVM.
Feed in 760 Hz +10 Hz 100 mV and adjust VR801 to obtain the
same level as above step 1.
Repeat above steps 1 and 2 until the difference of the levels
between steps 1 and 2 becomes 0.
Feed in 2.5 kHz +10 Hz 100 mV and adjust VR802 to obtain
2.87 V on the VTVM.
12 Distortion Output Level
Multiplier
13 Output Level
Standard Distortion
Generator to
INPUT Jacks
Function — T.H. Dist.
Meter Range - 1%
Input Level — 1V
Speed Cal. VR ~— Center
{See note)
Input Level VR — Max.
Osc. Output VR ~ Max,
Analog Multiplier P.C.B.
VR753, VR751, VR752
Note: Turn the Speed Calibration Control fully counterclockwise, then turn it clockwise approximately 7-1/2 times to set the Control to the center position,
VR304
i0K
R328
cu7i
R329
Fig. 5.1.12
10. UNWTD Output Level
NAKA-00088 / DRUCK 5
Fig, 5.1.13
11. Wow/Fiutter Output Level
14
Fig. 5.1.14
Fig. 5.1.15
12, Frequency Response and Distortion Output Level
Fig. 5.1.16
13. Multiplier Output Level
2:
. Set the output of the Distortion Generator to 400 Hz +10 dB
(3,16 V) 1% distortion.
Adjust VR753 to obtain 1% T.H. Distortion on the Bargraph.
. Set the output of the Distortion Generator to 0 dB {1 V) or
-10 dB {316 mV) and check to insure that the Bargraph indicates
O dB or -10 dB with a tolerance of + 1 segment.
. Set the output of the Distortion Generator to 400 Haz +10 dB
{3.16 V), O dB (1 V), or ~10 dB (316 mV} in 3%, 0.3%, or 0.1%
distortion.
Then check to insure that the tolerance of the Bargraph against
the input level is within the following specified range:
Tolerance:
0.3%, 1%, 3% ..... +1 segment
O.1% . ce eee eens +2 segments
If above does not comply with the specified one, following adjust-
ments are required:
a. Set the distortion of the Distortion Generator to 3%.
Adjust VR751 so that the indicated distortion on the Bargraph
stays the same when the output of the Distortion Generator is
changed from +10 dB (3.16 V) to -10 dB (316 mV).
b. Set the distortion of the Distortion Generator to 1% and adjust
VR751 in the same manner as above step a.
c. Set the distortion of the Distortion Generator to 0.3% and
adjust VR752 in the same manner as above step a.
d. Set the distortion of the Distortion Generator to 0.1% and
adjust VR752 in the same manner as above step a.
e. Repeat above steps a — d until specified tolerance is obtained.
f. After the above steps are completed, set the output of the
Distortion Generator to 400 Hz +10 dB (3.16 V) 1% distor-
tion and adjust VR753 to obtain 1% distortion on the
Bargraph.
ae cg
R756 R757 R773. R774
Fig. 5.1.17 Fig. 5.1.18
13. Multiplier Output Level
13. Multiplier Output Level!

5.2. Previous Type
STEP ITEM
SIGNAL SOURCE
OUTPUT CONNECTION
MODE
ADJUSTMENT
REMARKS
1 Oscillator Frequency
Frequency Counter to
Oscillator
OUTPUT Jacks
Function — Level
Oscillator — 400 Hz
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Not
specified
input Level VR — Max.
Osc. Output VR -— Max.
Switch P.C.B.
VC301
Adjust VC301 to obtain 400 Hz on the Frequency Counter.
2 Oscillator Distortion
Distortion Meter to
Oscillator
OUTPUT Jack
Function — T.H. Dist.
Meter Range — 1%
Input Level — 1 V
Speed Cal. VR — Not
specified
Input Level VR — Max.
Osc. Output VR — Max.
Osc. P.C.B.
VR302
Adjust VR302 to obtain 0.06% — 0.07% distortion.
Note: Connect an Oscilloscope to the Output of the Distortion Meter
and check to insure that no humming noise is included in the
signal.
3 Oscillator Output Level
4 Absolute Output Level
5 Log. Output Level
VTVM to Oscillator
OUTPUT Jacks
Function — Level
Meter Range ~ 1%
Input Level — 1V
Speed Cal. VR — Not
specified
Input Level VR — Max,
Ose. Output VR — Max.
Oscillator to
INPUT Jacks
Oscillator to
INPUT Jacks
DC Voltmeter to
TP-L, TP-R
{Absolute Rectifier
P.C.B.)
DC Voltmeter to
N22-1, CN22-2
Function — Level
Meter Range — 1%
Input Level — 1V
Speed Cal, VR — Not
specified
Input Level VR -- Max.
Osc, Output VR — Max.
Osc. P.C.B.
VR301
Adjust VR301 to obtain 1.2 V on the VTVM.
Absolute Rectifier
P.C.B.
VR701, VR801
Feed in 1 kHz 1 V and adjust VR701 (VR801) to obtain -1.5 V on
the DC Voltmeter.
Note: Input level should be measured with connecting T-100.
Function — Level
Meter Range ~ 1%
Input Level — 1V
Speed Cal. VR — Not
specified
Input Level VR — Max,
Osc. Output VR — Max.
Linear/Log.
Converter P.C,B.
VR103, VR203
Feed in 1 kHz 1 V and adjust VR103 (VR203) to obtain 2.18 V on
the DC Voltmeter.
6 Bargraph Full Scale
R307
VC301 SOP
@
C302
Fig. 5.2.4 Fig. 5.2.2 .
1. Oscillator Frequency 2. Oscillator Distortion.
NAKA-00088 / DRUCK 6
Oscillator to
INPUT Jacks
Fig. 5.2.3
3, Oscillator Output Level
Fig. 5.2.4
4. Absolute Output Level
Function — Level
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Not
specified
Input Level VR — Max,
Osc. Output VR — Max,
i)
Fig. 5.2.5
DIOZ
5. Log. Output Level
Display P.C.B.
VR701
or VRIO3
Z (VR203)
50K
Feed in 1 kHz 1 V and adjust VR701 so that the Bargraph indicates
0 dB.
Note: Adjust.VR702 only if circuit is repaired.
Fig, 5.2.6, Fig. 5.2.7
6. Bargraph Full Scale 7. Log. Adjustment
15

SIGNAL SOURCE
OUTPUT CONNECTION
ADJUSTMENT
REMARKS
Log, Output Level
Log. Dynamic Range
Log. Offset
Oscillator to
INPUT Jacks
Function — Level
Meter Range — 1%
Input Level - 1V
Speed Cal. VR — Not
specified
Input Level VR — Max.
Osc, Output VR ~— Max,
Linear/Log.
Converter P.C.B.
VR103, VR203
VR102, VR202
VR101, VR201
Feed in 1 kHz +10 dB (3.16 V), 0 dB {1 V), -10 dB (316 mV), or
-20 dB (100 mV} and check whether the Bargraph indicates +10 dB,
0 dB, -10 dB, or -20 dB.
(Allowance of error is within +1 segment on the Bargraph.)
Hf above is not obtained perform the following steps:
1. Feed in +10 dB (3,16 V}, and adjust VR103 for the left channel
and VR203 for the right channel to obtain +10 dB on the
Bargraph.
. Feed in -10 dB (316 mV) and adjust VR102 for the left channel
and VR202 for the right channel to obtain ~10 dB on the
Bargraph.
. Feed in -20 dB (100 mV) and adjust VR101 for the left channel
and VR201 for the right channel to obtain -20dB on the
Bargraph.
. Repeat above steps 1 — 3 until the error between input level and
indicated value on the Bargraph becomes within +1 segment on
the Bargraph in each input level.
Peak Level
Oscillator to
INPUT Jacks
Function — Noise-A
{+40 dB)
Meter Range — 1%
Input Level — 1 V
Speed Cal. VR — Not
specified
Input Level VR — Max.
Osc, Output VR — Max.
WTD-A Output Level
Oscillator to
INPUT Jacks
Function — Level
Meter Range — 1%
Input Level — 10 V
Speed Cal. VR — Not
specified
Input Level VR — Max,
Osc, Output VR ~ Max,
Oscillator and
Frequency Counter to
INPUT Jacks
Function — Wow/Flutter
Meier Range — 1%
Input Level - 1V
Speed Cal. VR ~— Center
(See note)
input Level VR — Max.
Osc, Output VR — Max,
Volume P.C.B.
VR102, VR202
Feed in 1 kHz 0 dB (1 V) and adjust VR102 (VR202) to obtain 0 dB
on the Bargraph.
WTD (SHF-A)
Network P.C.B.
VR101, VR201
Feed in 1 kHz ~20 dB (100 mV} and adjust VR101 (VR201) to
obtain 0 dB on the Bargraph.
Wow/Flutter P.C.B.
VR302, VR303
. Feed in 2,910 Hz +1 Hz 1 V and adjust VR302 to obtain -3%
speed on the Bargraph.
. Feed in 3,090 Hz +1 Hz 1 V and adjust VR303 to obtain +3%
speed on the Bargrapti.
UNWTD Output Level
Note:
R101
Fig. 5.2.8
7. Log. Adjustment
NAKA-00088 / DRUCK 7
VRI1O1 (VR201)
22
Standard Wow/Flutter
Generator to
INPUT Jacks
Fig. 5.2.9
. Log. Adjustment
16
DIOS
Fig. 5.2.10
8. Peak Level
@ spvrioi
Function — Unweighted
Meter Range — 1%
input Level — 1V
Speed Cal, VR — Center
{See note)
Input Level VR — Max,
Osc, Output VR — Max,
{VR201)
500
C107
Q103
Fig. 5.2.17
9, WTD-A Output Level
Wow/Flutter P.C.B.
VR304
Turn the Speed Calibration Control fully counterclockwise, then turn it clockwise approximately 7-1/2 times to set the Contro! to the center position.
. Set the Standard Wow/Flutter Generator to the following modes:
Center Frequency — 3 kHz
Wow Frequency — 4Hz
Wow/Fiutter — 1% (peak)
Output Level -— O5to2V
. Adjust VR304 to obtain 1% wow/flutter on the Bargraph.
C37
R329
Fig. 5.2.12
10. Speed
Fig. 5.2.13
11, UNWTD Output Level

SIGNAL SOURCE OUTPUT CONNECTION
MODE ADJUSTMENT
REMARKS
Wow/Flutter
Output Level
Standard Wow/Flutter
Generator to
INPUT Jacks
Function — Wow/Flutter
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Center Wow/Flutter P.C.B.
{See note) VR305
Input Level VR — Max,
Osc. Output VR — Max.
. Set the Standard Wow/Flutter Generator to the following modes:
Center Frequency — 3 kHz
Wow Frequency — 4 Hz
Wow/Flutter — 1% (peak)
Output Level - 05t02V
. Adjust VR305 to obtain 1% wow/flutter on the Bargraph.
Frequency Response
Distortion Output Level
Oscillator and
Frequency Counter to
INPUT Jacks
VTVM to SCOPE
OUTPUT Jack
Function — T.H. Dist.
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Center
(See note}
Input Level VR — Max.
Ose. Output VR — Max,
Distortion P.C.B.
VR801, VR802
. Feed in 25 kHz +10 Hz 100 mV and read the level on the VTVM.
. Feed in 760 Hz +10 Hz 100 mV and adjust VR801 to obtain the
same level as above step 1.
. Repeat above steps 1 and 2 until the difference of the levels
between steps 1 and 2 becomes 0.
. Feed in 2.5 kHz £10 Hz 100 mV and adjust VR802 to obtain
2.87 V on the VTVM.
Multiplier
Output Level
Standard Distortion
Generator to
INPUT Jacks
+
Function — T,H, Dist.
Meter Range — 1%
Input Level — 1V
Speed Cal. VR — Center
(See note}
Input Level VR — Max.
Osc, Output VR — Max,
Analog Multiplier P.C.B,
VR753, VR751, VR752
Note: Turn the Speed Calibration Control fully counterclockwise, then turn it clockwise approximately 7-1/2 times to set the Control to the center position.
Fig. 5.2.14
12. Wow/Flutter Output Level
NAKA-00088 / DRUCK 8
C813
R820
@ VR8OI
1K
Fig. 5.2.15 Fig. 5.2.16
13. Frequency Response and Distortion Output Level
VR751
22k
R756 R757
Fig. 5.2.17
14, Multiplier Output Level 14. Multiplier Output Level
Fig. 5.2.18
. Set the output of the Distortion Generator to 400 Hz +10 dB
{3.16 V) 1% distortion.
. Adjust VR753 to obtain 1% T.H. Distortion on the Bargraph.
. Set the output of the Distortion Generator to 0 dB (1 V) or
~10 dB (316 mV) and check to insure that the Bargraph indicates
O dB or -10 dB with a tolerance of +1 segment.
. Set the output of the Distortion Generator to 400 Hz +10 dB
(3.16 V), 0 dB (1 V), or -10 dB (316 mV) in 3%, 0.3%, or 0.1%
distortion. si
Then check to insure that the tolerance of the Bargraph against
the input levet is within the following specified range:
Tolerance:
0.3%, 1%, 3%
. If above does not comply with the specified one, following adjust-
ments are required:
a. Set the distortion of the Distortion Generator to 3%.
Adjust VR751 so that the indicated distortion on the Bargraph
stays the same when the output of the Distortion Generator is
changed from +10 dB (3.16 V) to -10 dB (316 mV).
. Set the distortion of the Distortion Generator to 1% and adjust
VR751 in the same manner as above step a.
. Set the distortion of the Distortion Generator to 0.3% and
adjust VR752 in the same manner as above step a.
. Set the distortion of the Distortion Generator to 0.1% and
adjust VR752 in the same manner as above step a,
. Repeat above steps a — d until specified tolerance is obtained.
After the above steps are completed, set the output of the
Distortion Generator to 400 Hz +10 dB (3.16 V) 1% distor-
tion and adjust VR753 to obtain 1% distortion on the
Bargraph.
R773 R774
Fig, 5.2.19
14, Multiplier Output Level
17
ay

6. MOUNTING DIAGRAMS, CIRCUIT DIAGRAMS AND PARTS LIST
Note: Mounting diagram shows a dip side view of the printed circuit board.
6.1. IC Block Diagrams
1
Output A +V
Inverting Input & Output B
Non-Inverting Inverting
Input A input B
-V 4 Non- Inverting
Input 8
(TOP VIEW)
Fig. 6.1.1 OP Amp. IC 4558
TA7136P
r
Fig. 6.1.3 OP Amp. IC TA7136P
pASSSTC
Flip-Flop
i
fase |
rege |
:
a er
Fig. 6.1.5 Timer IC uAS55TC
Output Frequency
Compensotion B
Output Frequency
Compensation A
input Frequency
Compensetion 8
Input Frequency
Compensation A
(TOP VIEW)
Fig. 6.1.2 OP Amp, IC 4709
output
pPCsr7H .
Fig. 6.1.4 FM IF Amp. IC “PC577H
von Qz2 Qz CK2 Re D2 $2
a 6 cKi Rr Or St
(TOP VIEW)
Fig. 6.1.6 D-Type Flip-Flop C-MOS IC TC4013BP
18

62, Connector P.C.B. Ass’y
TO CN-I7
(ve PCB.)
0. CN
(sw Pep)
Jo cn?
(WR PCB.)
TO CN-14
(Sw PCB)
TOONS
{sw PCB)
BA03893A | Connector P.C.B. Ass’y
0B07751B | Connector P.C.B.
BAO3808A | 19P Connector Ass’y (7 pes.)
0B08435A | CN Connector A (1 pce.)
0B08436A | CN Connector B {1 pce.)
0B084378 | CN Connector C {1 pce.)
OB08438A | CN Connector D (1 pce.)
OB08185A | 3P-T Post {2 pes.}
0B08183A | SP-T Post {1 pce.}
19