Harman Kardon HK3500 User manual

The Harman Kardon
Model hk 3500
Stereo Cassette Deck
echnical Manual
harman/kardon

ALIGNMENT PROCEDURES
ELECTRICAL ADJUSTMENTS
EQUIPMENT REQUIRED
Audio Signal Generator
Frequency Counter
V.T. V.M.
Distortion Meter
Oscilloscope OF WN =
NOTE: All adjustments should be made under the following conditions unless otherwise noted.
Power Supply Voltage is AC120V for RV units (220V for MV units).
Doiby NR Switch is at OFF position.
Test Tone Switch is at OFF position.
EO Selector Switch is at LOW NOISE position.
Bias Selector Switch is at LOW NOISE position.
Record Mute Switch is at OFF position.
Tape Mon Switch is at TAPE position.
Subsonic Filter Switch is at OFF position.
Power Switch is at ON position.
Bias Trim is at NORMAL position.
Microphone Level is 0.
Output Level is 10.
Signal Source is connected to INPUT LOW.
SIGNAL MEASUREMENT
ITEM SOURCE CONNECTION ADJUST INSTRUCTIONS
DOLBY 5kHz 200mV V.T. V.M. to SMT Vcore Line Level
and SMT Vcore
V.T. V.M. to TP2
and Gnd.
CONOARWN =
— a ae ee | WNAO
1. Adj. for 23.5mV on V.T. V.M.
V.T. V.M. to neg. VR11 | | 2. Adjust so that output at Dolby on is
side of C47 and Gnd. +8dB than output at Dolby off.
V.7T. V.M. to neg.
side of C247 and Gnd.
V.T.V.M. to TP7
and Gnd.
VR211 —
5kHz to TP5
and Gnd.
Play ——- 3. Adjust input for 59mV on V. T. V. M.
VR10 (L) 4. Adj. output so that output at Dolby
on is —8dB than output at Dolby off.
LS 5. Adj. input for 59mV on V.T. V.M.
VR210 (R) 6. Adj. output so that output at Dolby
on is —8dB than output at Dolby off.
a
5kHz to TP6
and Gnd.
AUTO
SHUTOFF
V.T.V.M. and TP8&
Frequency Counter
to TM905 (On Auto
Shutoff Bd.) and Gnd.
1. Frequency reading on counter should be
between 154Hz to 232Hz. (If not within
spec. change C907 to higher or lower value]
2. Confirm stopping within 2.5 sec. after the
tape stops.

ALIGNMENT PROCEDURES
SIGNAL MEASUREMENT
ITEM SOURCE CONNECTION ADJUST INSTRUCTIONS
MPX FILTER] 1kHz 200mV
to Line In
19kHz mv to
(Low) Line
1kHz 200mV
(Low) Line
16kHz 200mV
(Low)} Line
19kHz 200mV
(Low) Line
SIGNAL MEASUREMENT
ITEM SOURCE CONNECTION ADJUST INSTRUCTIONS
PLAYBACK 400Hz Play/ Tape 1. Adj. output for 775mV on V.T. V.M.
LEVEL Doiby Test Tape and Gnd. Vion. rear panel)
(MTT-150) |
and Gnd. rear panel) |
V.T.V.M., to (L) 2. Confirm that output is 1.5V £1.5dB.
ae!
400Hz V.T.V.M. to TP9 Play/Tape 1. Adj. for 1.2V on V.T. V.M.
Dolby Test Tape and Gnd. Mon.
VR502 (L)
(MTT-150)
V.T.V.M. to TP10 VR602 (R)
and Gnd. :
VR504 (L) 2. Adj. for O vu on meter.
boo vR604 (Fi)
Source
1kHz 200mV 3. Adj. for 0 vu on meter.
200mv —20dB VR504 (L) 4. Adj. for —20 vu on meter.
1kHz 200mV VR502 (L) 5. Adj. for 0 vu on meter.
(Repeat steps 4 and 5 to obtain
correct meter readings).
1kHz 200mV 6. Adj. for 0 vu on meter.
200mV —20dB VR604 (R) (| 7. Adj. for —20 vu on meter.
1kHz 200mV VR602 (R) 8. Adj. for 0 vu on meter. (Repeat
steps 7 and 8 to obtain correct
meter readings).
V.T.V.M. and Source Play Line Level 1. Adj. for O vu on meters.
Frequency Counter
to Line Out Dolby On
w/ Filter
L2 (L)
L202 (R)
Line Level 3. Adj. for O vu on meters.
4. Confirm that 16kHz output is more than
—1dB of 1kHz output.
5. Confirm that 19kHz output is less than
—30dB of the 1kHz output.
2. Adj. for minimum output.

ALIGNMENT PROCEDURES
SIGNAL MEASUREMENT ;
iTEM SOURCE CONNECTION ADJUST INSTRUCTIONS
TEST TONE Source VR3 (L) 1. Adj. for 0 vu on meter.
Test Tone Sw.
400Hz
VRb5 (R)
VR4 (L)
VR6 (R)
Source
Test Tone
Sw. 8kHz
PEAK 1kHz 200mV Source Line Level 1. Adj. for O vu on meters.
INDICATOR
1kHz 200mV
+2dB
2. Adj. for —20 vu on meter.
VR503 (L) 2. So that peak LED is on at input level
+2.5dB and off at +1.5dB.
VR603 (R)
PLAYBACK MTT216, V.T.V.M. Play Tape VR7 (L) High Adj. to meet specifications. (Fig. A)
FREQUENCY} MTT116U or to Line Outputs Mon. VRQ (L) Middle
CHARAC- MTT217C Bias - LN ;
TERISTIC - EO-LN VR207 (L) High
VR209 (R) Middle
PLAYBACK V.T.V.M. to
PlayTape Confirm that the curve meets
FREQUENCY Line Outputs Mon. specification. (Fig. A).
CHARAC- Bias - Cr02
TERISTIC EO - Cr02
MTT116K
(CrO2)
1. Set variable resistors (VR19, 20, 22, 23)
for bias adj. to center,
BIAS Frequency counter 2. Adj. for 105kHz on Frequency Counter.
FREQUENCY to PT13 and Gnd.
AND TRAP
3. Confirm 105kHz =3kHz when switch is at
any position.
4. Adj. for minimum output.
V.T. V.M. to Line Rec/Play
Output Tape Mon.
L203 (R)

ALIGNMENT PROCEDURES
SIGNAL MEASUREMENT
ITEM SOURCE CONNECTION ADJUST INSTRUCTIONS
Do ee a ree ae a]
V.T.V.M. to TP13 L4 (L)
and Gnd.
V.T.V.M. to TP15 204 (R)
and Gnd.
V.T. V.M.to TP11 L5 (L)
and Gnd.
V.T.V.M. to TP12 L205 (R)
and Gnd.
BIAS TRAP
(REC.)
1. Adj. for maximum output.
2. Adj. for minimum output.
BIAS LEVEL 1. Adj. for 10mV on V.T. V.M.
V.T.V.M. to TP13 VR22 (L)
and Gnd. .
VR23 (R)
V.T. V.M. to TP15
and Gnd.
Test Tone V.T.V.M. to Line Rec/Play VR17 (L) 2. Adj. for same level at both source and
400Hz (Maxell Output Bias - LN {on front tape mon, positions.
UDXLI) EQ-LN panel)
Test Tone
Sw. 400Hz
VR217 (R) (on
front panel)
V.T.V. M. to Line Rec/Play 3. Adj. for —20 vu on meters.
Output Tape Mon.
Bias - LN
Bias Trim 4. Note the line output level when
obtaining maximum output. (Return
bias trim pot. to center detent).
VR23 (L)
VR22 (R)
5. Increase bias level so that the fine
level output drops 2.5dB below the
maximum line output level from step 4.
V.T.V.M. to TP13 Rec. VR19 6. Adj. bias level for +2dB than the bias
and Gnd. Bias-FeCr level at Low noise position.
6.3kHz 200mV
VR20 7. Adj. bias level for +4dB than the bias
Cr02
— at low noise position.
BIAS
FREQUENCY
AND TRAP
V.T.V.M. to TP13 Rec. Bias Trim
and Gnd,
V.T.V.M. to TP15
and Gnd.
Cr02
Confirm bias frequency and bias trap
adjustment.
BIAS TRIM
Confirm that bias level changes from
—30% (max. —45%) to +30% (max. +45%

ALIGNMENT PROCEDURES
ADJUST INSTRUCTIONS
SIGNAL MEASUREMENT
ITEM SOURCE CONNECTION
REC
LEVEL
1kHz
200mV
V.T.V.M.
to
Line
Line
Level
1.
Adj.
for
0
vu
on
meters.
(LN)
Out.
Rec/Play
VR17
(L)
(on
2.
Adj.
for
O
vu
on
meters.
Mon.
front
panel)
VR217
(R)
(on
front
panel)
3. Adj. for O vu on meters.
(FeCr) VR14 (L)
VR214 (R)
(Cr02) VR16 (L)
WAVE
1kHz 20mV Rec/Play VR18 (L)
(square wave) VR218 (R)
4. Adj. for 0 vu on meters.
Oscilloscope to
Line Output
2. Adj. for obtaining minimum tilt
and maximum rise time.
I~ LIN
Acceptable Unacceptable
REC/PLAY 1kHz 200mV V.T. V.M. to Line 1. Adj. for 0 vu on meters.
all _
FREQUENCY | to Line In Out
CHARAC- (Low)
TERISTIC es
(LN) 20Hz - 17 kHz Rec/Play VR12 (L) . Adj. to meet specifications (Fig. 2)
200mV - 30dB Mion.
EO-LN VR212 (R)
Bias - LN
Rec/Play
Mon.
EQ - FeCr
Bias - FeCr
VR13 {L)
VR213 (R)
. Same as above (Fig. 3)
Rec/Play
Mon
EQ - Cr02
(Cr02)
. Bias-Cr02
SQUARE
WAVE
VR15 (L)
VR215 (R)
4. Same as above (Fig. 4).
Confirm square wave test. When adjusting
again, confirm Rec/Play frequency
characteristic.

ALIGNMENT PROCEDURES
MECHANICAL ADJUSTMENTS
1. REC/PLAY READ ADJUSTMENT
(1) Adjust screw (A) so that the chip of the head gauge (M-300) does not touch the tape guide as
shown in figure 2.
(2) Make the mechanical assembly stand and adjust screw (B) as shown in figure 3.
NOTE: Never fail to confirm the above adjustment (1) when adjusting screw (B).
(3) Connect VTVM to line output jacks and play back 10 kHz test tape (TEAC MTT114).
Adjust screw (C) so that the output on the VTVM will be maximum and have a little level
change (less than 1 dB) at both channels.
NOTE: Never fail to confirm the above adjustments (1) (2) when adjusting screw (C).
(4) Repeat steps 1 through 3 until being able to confirm above all adjustment without adjustment.
LON
(c) R/P HEAD ()
FIGURE 1
TAPE GUIDE
90°
CHIP
FIGURE 2 FIGURE 3

ALIGNMENT PROCEDURES
2. ERASE HEAD TENSION ADJUSTMENT
Adjust location (1, 2 or 3) hooked by coil spring so that the tension by erase head may be 30g + 5g
when keeping apart erase head from special boss. (Figure 4 and 5).
SPECIAL
FIGURE 4 FIGURE 5
3. PINCH ROLLER TENSION ADJUSTMENT
Bend the adjustment point hooked by coil spring in the arrow directions so that the tension by
pinch roller may be 400g + 40g when keeping apart pinch roller from capstan (about 0.5mm)
and returning it to rotate. (Figure 6). :
ADJUSTMENT
POINT
FIGURE 6

ALIGNMENT POINTS
FIG A— PLAY FREQUENCY CHARACTERISTIC
+4dB +4dB
+3dB 31.5Hz 14Hz +3dB
+2dB + - 3 7 +208
+1dB
+1dB
OdB 0dB
—1dB —1dB
—2dB + - - +~2dB
—3dB ~3dB
—4dB —4dB
FIG B —PLAY/REC FREQUENCY CHARACTERISTIC
+44B+ 20Hz 40Hz W7KH2 +-44dB
20Hz
40Hz
15kHz 17kHz
15kHz 17kHz

ALIGNMENT POINTS
VR604 VR20 VR502 VR503
VR603 | VRG02
VR215
T2
VR213
VR22
VR212
VR23
V
R4———
je
Or
ee
Se
T201
VR3
T1
VR214
VR15
VR5
VR13
VR210
VR12
VR6
L4
VR10
L6
VR216
L5
V
R211.
aaa
L204
L3 | VR207 | VR209 |VR218
VR9I- L202 L2 L1 VR11 VR18
=40.—
oma
wren