Philips Mz-9 Service Manual

Service Information
Service Service
Service
ServiceService
Product Service Group CE Audio
3139 785 30089 10 - 09 - 2002
MZ-9/22
A02 - 174
Already published Service Informations :
CHANGES DURING PRODUCTION
FRONT BOARD
* From production week 0217 onwards the following has been changed
to solve Thin/Thick Disc readability problem and to improve on the
Tape transition timings.
Change 7400 3139 110 53251 TMP87CS71F - MZ9S53251
* From production week 0225 onwards the following has been changed
due to material...

ETF7 TAPE MODULE
(Non-Dolby Version)
9-19-1
TABLE OF CONTENTS
Tape Module Wiring & variation table ....................... 9-1
Block diagram ............................................................ 9-2
Brief Introduction ....................................................... 9-3
Connector assignment ............................................... 9-4
Tape deck electronics & Tape adjustments ............... 9-5
ETF7 Non-Dolby board layouts ................................. 9-6
Analog Circuit diagram...

9-29-2
BLOCK DIAGRAM
Deck B (Rec/Pb) switches, sensors & motor
4xDECK(S) SW.
STATUS TO
VOLTS CONV. 2x
   SOLENOID
SUPPLY CTRL   SOLENOID
SUPPLY CTRL
MOTOR VCC
SUPPLY CTRL
NS/HS CTRL
Deck A (Pb) switches, sensors & motor
NOM/HI SPEED
    REC EON.
IEC I        IEC II
    REC EON.
REC EON. SW.
  HEF4952BT
RECORD AMP
  NJM4560D
OSCILLATOR
REC
CRB
Line-In
Playback
Head
Rec/Pb
Head
Erase
Head BIAS SYM
HD SW. BIAS ADJ
Erase Bias
REC
ALCEN
PRE-AMPLIFIER
     AN7318S
SOURCE SEL
 HEF4952BT
1A0 1A1 1A2
Rec current...

9-39-3
General
1.
Playback Mode
Signal from the playback head Deck A or Deck B is selected and fed through by the Mode Selector IC7710 (HEF4952BT).
The signal is amplified by amplifier IC7720 (AN7323S) before feeding to the IC7740 (HEF4952BT) and out to the AF Board
via connector 1701.
2.
Recording Mode
Recording Signal is selected and fed through by the Mode Selector IC7710 (HEF4952BT) which is then amplified by the
amplifier IC7720 (AN7323S). The amplified output signal will pass through IC7730...

CONNECTOR 1740DECK A & B CONTROL INTERFACE (For Dolby B NR version only)
1 REC REW Record tab protection status switch (reverse) [open=on: close=off]
2 CrO2 BChrome tape detection switch deck B [open=Cr: close=Fe]
3 REC FWD Record tab protection status switch (forward) [open=on: close=off]
4 PHOTO B Photo sensor output (tape movement indication)
5 SOL B Solenoid supply for deck B
6 Vcc Deck / Motor supply
7 MODE B Mode switch (head engagement) [open=off: close=engaged]
8 GND M Deck / Motor ground
9 SOL A...

9-59-5
# For Auto-reverse version only
* If high frequencies are not within limits, decrease bias and re-measure.
If distortion is too high, increase bias and re-meaure
^ Not applicable for Ferro version PLAYmV-meter
check
limits see fig.1
CHECK PLAYBACK FREQUENCY RESPONSE
TAPE ADJUSTMENT & CHECK TABLE
TEST
CASSETTERECORDER
MODEMEASURE
ONREAD ONADJUST
with
ADJUST MOTOR SPEED
SBC420
3150HzPLAY B
PLAY Afrequency
 counter3620
check
NORMAL SPEED
PLAY
PLAY FWD
PLAY REV #W&F-meter
mV-meterleft hand screw
right...

9-69-6
COMPONENT LAYOUT
CHIP LAYOUT
3139 113 3409 pt2  dd wk0042
3
42
1
653139 113 3409 pt2  dd wk0042
Some location on this board is prepared for both 0603 & 0805 SMDs footpr\
int,
in such locations 0603 SMDs may be substituted.
3
42
1
65 

9-79-7
ANALOG CIRCUIT
21
34
3
4
6
5
01
11 1
1
1
CHANNEL
S2 S1
11
S3
0
0
S3
REC MUTE
#    For Provision Only
#
# #
1701 F9
1710 C1
1730 A1
2701 B2
2702 B2
2703 A2
2704 B22705 A2
2706 A2
PB/REC
Pb deck B
S1
S3 S0
0S4
1
LEFT CHANNEL
11
1
01
123456789
12345
1
1
1
0 STOP
S1
0
--
1
1 01
*
*
1
--1 S1
0
6789 A
B
C
1
1
RIGHT
A0
0
10
S2
S3
S0
S1
S0
1
1
S4
S2
1
MODE
D
E
FA
B
C
D
E
F
S4
EQUALISATION
01
HS ChromeA0 S0
1
0
1
S2
1
SELECTOR
----
HS Ferro
2707 A4
2708 B4
2709 A5
2710 B5
2711 A62712 B6
2713 A6
2714 B6...

9-89-8
SERVO CONTROL CIRCUIT
L
Gnd
*
B
CD
E
1702 A71703 B1
1706 E1 1760 B8
1770 B7
2621 D2 2622 D2
#  For Provision Only
GND_P
*AD1
DATA
TO/FROM  FRONT
123456789
1234
sol_B
STROBE
*
DECK AB
56789
A
BCD
E A
2623 D2
2624 E2 2625 E4
2626 B1
2627 A7 3601 B2
3602 C2
3603 B2 3604 C2
3605 B3
3606 C3 3607 C6
3608 D6
* 
* 
*  * 
* 
* * 
CCTRY
Rec_RVS
* 
#
#
##
* 
3609 C63610 D6
3611 C6
3612 D6 3613 B2
3614 C6
3616 A5 3618 A4
photo_B
*  See Variant Table for details
+5 Rec_RVS
H
3619 A4
3620 A4 3622 A4
3623 B3...

9-9
9-9
TAPE MECHANISM - MOTOR EXPLODED VIEW
31 4822 361 11055 Motor Assembly
91 - Screw M2,6 x 5
92 - Screw M2 x 5
Note: Only the parts mentioned in this list are normal
service spare parts.
TAPE MODULE EXPLODED VIEW
1 3139 118 77130 Autoreverse Mech. CWE44FR01
1 3139  118  77140 Non-Autoreverse Mech.  CWE44FF02  Chrome/Ferro
1 3139 118 77950 Non-Autoreverse Mech. CWE44FF05  Ferro
3 - Screw D3 x 10
6 - Screw M2 x 16
7 3139 110 34080 Flex Cable 14 pin 7,5 cm
Note: Only the parts mentioned in this list...