Philips 22RC026/00 User manual

Car CD changer 22RC026/00
Service
Service
Service
Contents
Specifications
Service
Interface cable connections
Functional explanation
Notes regarding CD player repairs
Notes regarding handling of the pick-up
Pick-up detail
Disassembly
IC circuit descriptions and IC block diagrams
Block diagram
PCB layout / connections
Circuit diagram 1/3
Circuit diagram 2/3
Circuit diagram 3/3
Trouble shooting
12VCP
19
20 and 23
21
22
24
25
Exploded view CD changer mechanism / Lubrication overview 28
Mechanical parts
Exploded view cabinet parts
Cabinet parts and accessories
Electrical parts
=
29
30
31
31
COMPACT
LASER PRODUCT
DIGITAL AUDIO
Published by Philips Car Systems 9672 Printed in The Netherlands ©Copyright reserved Subject to modification (GB) 4822 725 25470
56
PHILIPS
PHILIPS

SPECIFICATIONS
Power supply > 13.2VDC (nom.) Distortion >: <£0.01% (at 1kHz)
© 16.0VDC (max.) Data - Track mute : 2 93dB (A-weighted)
Frequency response : 20-20,000 Hz (+ 1dB) Wow and flutter : unmeasurable
DAC resolution : 1 bit per channel Output voltage > 700mV
Bus interface : D?B Operating positions : Horizontal/Vertical/45°
Crosstalk L<>R : <-75dB Weight : 2kg
S/N ratio ‘ 96dB (A-weighted) Dimensions (HxWxD) : 66x 259x175 mm
SERVICE
IMPORTANT !! !! IMPORTANT
- When disassembling, ALWAYS protect the pick-up unit against ESD damage by closing the solder connection of
the pick-up unit either on the CD panel or the flexible foil pcb!
(See also the repair notes and disassembly procedures described in this manual.)
- New pick-up units are supplied with CLOSED solder connections on the flexible foil pcb.
Do NOT forget to remove the solder connection AFTER replacing the unit!
SERVICE HINTS |
- To prevent magazine check (duration approx. 30-40 sec.), insert the magazine and press the ‘eject’ button
SIMULTANEOUSLY. In that case disc no.1 is loaded and the set comes into 'Standby' mode.
- Use (home-made) extension cables of approx. 30 cm to get access to the bottom side of the main pcb for
measuring purposes. Two extension cables (a 2-pole and a 5-pole one) are required. To make these cables, the
following parts can be ordered and used for making the extension cables:
CS801 - cable assy 2-pole - 4822 321 62668
- CS802 - cable assy 5-pole - 4822 320 11738
- The set can also operate without cover, but take care of the following measures:
- ABSOLUTELY NEVER PERMIT LASER BEAMS TO ENTER THE EYES
- DONOT EXPOSE THE SET TO BRIGHT (SUN)LIGHT
- When the CD changer has a defect while the magazine is still in, the magazine can be removed by moving the
emergency eject lever to the right by a small screwdriver, as shown in figure 1 below. First the protection sheet has
to be removed. DO NOT FORGET to put the sheet back, to prevent dust intrusion! When a disc is chucked, turn the
gear to the right until the slide lever reaches to the edge of the left side (see figure 2).
Slide lever Cs Gear
i
i
i
i
j
|
|
Figure 1
INTERFACE CABLE CONNECTIONS Figure 2
22RC026 -2-

PCOS 62 459
INTERFACE CABLE CONNECTIONS (continued)
The figure below shows the pin layout of the connections of the interface cable (service 12nc:
4822 321 62263) and the extension cable (service 12nc: 4822 321 62671).
All connections here are seen from the front side of the connectors.
Rectangle_C connector
t
INTERFACE CABLE
RECTANGLE_C CONNECTOR
BUS_GND
Comer + 12V PERM.
7 [wen
Ce
SIGN_GND
(SHIELD) | (GND)
13-pole DIN
female female
13-pole DIN
male
4
EXTENSION CABLE
13-POLE DIN CONNECTOR
SIGN_GND
= ew
Ce
7 [raven
on
ois
+ 12V PERM.
BUS_GND
_ Go
(straight or hooked version)
. we 8
‘od 6 6
ae.
O
8-pole DIN: 8-pole DIN
male female
t
CD CHANGER
CONNECTOR
8-POLE DIN CONNECTOR
22RC026

FUNCTIONAL EXPLANATION :
FUNTIONAL EXPLANATION
1. APC (Auto laser power control) 5. Tracking servo
This is the circuit to control laser power of pickup, and
laser ON/OFF is set by command from micro computer.
. RF Amplifier (| pattern output)
This inputs pickup photo diode output current (A+C) to
FIN2 (ipin), and (B+D) to FIN1 (2pin). Input current is
IV-converted, and output to RFSM (41pin) of RFSM
amplifier output by. way of AGC circuit. Self-contained
AGC circuit has variable range of +3dB, and the time
constant can be varied by outside-fixed condenser of
PH1 (60pin). This also controls bottom level of EFM
signal (RFSM output), and this response can be varied
by outside-fixed condenser of BH1 (61pin). Central
gain of AGC variable range is set by resistance value
between RFSM (41pin) and RFS-(42pin).
. SLC (Slice level control)
SLC makes duty of EFM signa! which is input to DSP
50%. This judges duty, and decides DC level by inte-
grating EFMO signal which is output from DSP.
. Focus servo
Focus error signal can be gained by detecting the dif-
ference between (A+C) and (B+D), which is (B+D)-
(A+C), and it is sent to FE (20pin). Focus error signal
gain is set by resistance value between FE (20pin) and
FE-(21pin).
FA amplifier is. phase compensating Amplifier, and the
equalizer curve is set by outside-fixed condenser and
resistance. Besides, this amplifier has muting function.
FD amplifier has the following functions; phase com-
pensating circuit, focus search signal synthesis, and
offset cancelling. Focus search starts by F-SERCH
command, and generates lamp waveshape by inner
clock. Focus error signal by this waveshape detects in-
focus condition (focus zero cross), and turns on focus
servo. Lamp waveshape amplitude is set by resistance
between FD (16pin) and FD-(17pin).
This inputs pickup photo diode output current to E
(Spin) and F (4pin). input current is |V-converted, and
output to TE (7pin) by way of VCA circuit for balance
adjustment and VCA circuit for follow-up to RFAGC cir-
cuit. Tracking error gain is set by resistance between
TE-(6pin) and TE (7pin). ;
TOFF amplifier just after TE (7pin) turns off servo b
TOFF signal from DSP. |
TH amplifier varies servo response characteristic by
TGL signal from DSP. or by THLD signal of inside for-
mation by detecting JP signal. When DEFECT is de-
tected, inside mode changes into THLD. This can be
avoided by causing short circuit in DEF (49pin) to
“L”’=GND. In case of detection, gain can be automati-
cally up by configulating outside DC! (9pin) band pass
filter which picks up only shock element out of tracking
error signals and putting it in.
TO amplifier has the function of synthesizing JP pulse
and cancelling tracking offset: JP pulse is set by JP
(14pin) (THLD is detected inside ). |
. Sled servo
SLEQ (28pin) sets response characteristic. Amplifier
after SLEQ (28pin) has muting function, and mutes
SLOF (38pin) by “H” or SLED OFF command. Sled
feed is operated by means of current input to SL-
(30pin) and SL+(31pin), that is, by connecting to output
port of micro computer by resistance and setting feed-
ing gain by the resistance value.
. Spindle servo
This configurates, together with DSP, servo circuit to
keep disc linear velocity at a scheduled level. This re-
ceives signal from DSP by CV-(39pin) and CV+(40pin),
and sets equalizer characteristic by SP (23pin), SP-
(36pin) and SPD (27pin) which output to SPD (27pin).
SPG (25pin) is set by resistance with which amplifier
gain of 12cm mode is connected to standard voitage.

FUNCTIONAL EXPLANATION
8. TES, HFL (Traverse signal)
10.
PCS 82 441
In transferring pickup from inner track to outer track, EF
output from pickup should be so connected that HFL
and TES Nave phase relation as shown in the figure
below. TES comparator has about +100mvV hysteresis
at -polarity comparator against TESI input. To pickup
exclusively necessary signals out of TE signals, band
pass filter is configurated outside.
. DRF (Beam level judgement)
DRF becomes “H”, when EFM signal (RFSM output) is
held at peak value by condenser of PH1 (60pin) and
peak value of RFSM gets over 2.1V. Condenser of PH1
(60pin) is related to setting both DRF constant when
detected and RFAGC response.
—
ZEEE.
2:1
FE 7 \___________
\ ,
bal
Pickup
position | Pa
In focus
In-focus judgement
This detects DEF+0.2V of focus error signal S curve,
and then judges focus zero cross (being in focus) when
S curve becomes REF.
sinepone laos ‘REPO, 2V
5 i Ne a EM cad ene ra dit se =
re
In focus
11. DEFECT
This normally maintain mirror surface level by con-
denser of LF2 (59pin), and when lack of EFM signal
(RFSM output) gets over 0.35V, outputs “H” to DEF
(49pin). When DEF (49pin) becomes “H”, tracking
N.Y
LF2
(S9PIN)
a
sy
ania
Pw
ewveed rocco
= eee
DEF (49PIN) 7
12. Reset circuit
When Vcc gets over about 2.8V, Power on Reset is
cancelled.
22RC026

FUNCTIONAL EXPLANATION
Mechanical Timing
MAG IN
H
ELv +. L
+
ELV - L
|
LOAD + L : y
a}
’
:
‘
LOAD - L
H :
LOADOUT s_L ;
a 4
CLAMP L } :
H ’ '
UPLIMIT L
|
: :
LOWLIMIT —soL . 1
H ' 4
DISC ON L t
; 3 !
DISC
COUNT
L
!
H '
MAG.SW
L
‘
‘ i] '
' '
1 0.6s0c ~ ~- 15sec -
\ ’
{Disc LOADING)
DISC CHANGE(DISC1 —2)
H
ELV + L ,
|
ELV - u 5 t :
4 | ‘
| i]
LOAD + L
‘4 + 1 4 | i]
LOAD - u
H
LOADOUT L
H
CLAMP kL
H
UPLIMIT L
H
! ' t t \
LowumitT Lf ! ’ H \ ' :
iH
1
4
I
t
'
;
i '
DISC ON L
eH
DISC COUNT L
‘ t 4 ' t |
Hn]
}
'
'
'
;
MAG. SW L
- 0.2sec —
{ELV DOWN)
= 1.5sec —_
(Disc LOADING)
= 1.5sec a
(Disc UNLOADING)
awaewoewew ee
ewewtwewr ne ee
——<——<_s_eeeean =
"ss ee eee
ee mene me ew eee
MAG EJECT(DISC1 PLAY)
Hi
ELV + L.
a
ELV - L
H
LOAD + L
H
LOAD - L
La!
LOADOUT L
a!
CLAMP L
a]
UPLIMIT L
4
LOWLIMIT L
H
DISC ON L
a!
DISC COUNT L
4
MAG.SW L
a!
EJECT L
—+ meee
- 1.5sec -_ asa 2.580c = =r, 3.0sec rad
(Disc UNLOADING) (ELV DOWN) (ELV UP)
PCS 82 442
22RC026 -6-

NOTES REGARDING HANDLING OF THE PICKUP
Touching this part can cause function
deterioration. Please be careful never to
touch this part.
Flexible wire
(connecting wire)
PCB Partially fixed VR
Holding and pulling flexible wire can cause
breaking of wire. Please be sure to hoid the
housing itself in handling
PICKUP DETAIL
PICKUP FPC
(18P PATTERN SIDE)

DISASSEMBLY
1. Remove 9 screws (A) securing the
cabinet.
2. Remove the cabinet with pushing
the front panel stopper.
3. Remove the front panel with
pushing the both bottom lid stopper.
4.Remove 2 screws @) and the
connector (©) Connect P.C.B. can
be removed.
5. Remove the cushion.
6. Remove the damper.
7. If remove the spring () installed
between the mechanism and the
chassis, also mechanism can be
removed.
‘sy
Be
22RC026
REINFORCEMENT,DIN
Se
BOTTOM
LID
DAMPER
CUSHION

DISASSEMBLY
CD MECHANISM |
1) How to remove the ELEVATOR MOTOR, FEED MO-
TOR and the LORDING MOTOR.
(1) How to remove the FEED MOTOR.
1. Short the short-pattern of FPC, PU with sol-
der.
2. Remove the two screws (SCR S-TPG PAN PCS 2
x3) which fasten the MECHA-PANEL
(134). The MECHA-PANEL can be removed.
3. Remove the four screw (SCR S-TPG PAN PCS 2x
4) ©1}) which fasten the MAIN PCB |
4. Remove the connectors (CP801 and CP802).
5. Only when you will also remove the ELEVATOR
MOTOR, remove FPC602.
6. Remove the five screws (SCR TPG PAN PCS 2x
4) (10) which fasten the TOP CHASSIS C71).
The TOP CHASSIS can be removed.
7. Remove the two screw (SCR S-TPG PAN PCS 2X
2.5) (C55) which fasten the FEED MOTOR €54).
(2) How to remove the ELEVATOR MOTOR.
1, Remove the SPECIAL WASHER (C5) which fasten
the GEAR A (2) and the GEAR B (3).
The GEAR A and the GEAR B can be removed.
2. Remove the two screws (SCR S-TPG PAN PCS 2 x
2.5) (C8) which fasten the ELEVATOR MOTOR
(7). The ELEVATOR MOTOR can be removed.
MECHA-PANEL
ELEVATOR MOTOR

DISASSEMBLY
(3) How to remove the LOADING MOTOR. SLIDE PLATE
1. Remove the SPECIAL WASHER which fasten
the GEAR LA and GEAR LB(C5}) . The
GEAR LA and GEAR LB can be removed.
2. Moving the slide plate C €15)to the right, lower the
elevator to the third slot position.
3. Remove the two screws (SCR S-TPG PAN PCS 2
2.5) which fasten the LOADING MOTOR =
LOADING
The LOADING MOTOR can be removed.
| MOTOR
2) How to remove the PICKUP and the SPINDLE MOTOR.
(1) How to remove the CD PCB and PICKUP.
1. Short the short-pattern of FPC, PUC99 with solder.
2. Remove CS903, FPC602, CP904, CP905 and
CP906 from the connector.
3. Remove the two screws (SCR S-TPG PAN PCS 2 x
4) (72) and one screws (SCR S-TPG BIN 27)
(C73) which fasten the CD PCB (cB.
4. Remove the screw (SCR S-TPG BIN 2X7)
which fix INSIDE SWITCH @78).
5. Remove the two screws (SCR PAN PCS 1.7 3.5)
| and THRUST, SCREW (96), PLATE,
SLIDE Es? will come off.
6. Remove the two screws SPECIAL SCREW
which fix SHAFT, PICKUP, A839).
FPC PU
Short circuit soldering.
7. Remove the SHAFT, PICKUP, A from the
PICKUP, LASER €87). PICKUP. LASER
The PICKUP, LASER can be removed. short circuit
position.
8. Cause short circuit by soldering in PICKUP, LASER
| Cause shor circuit on the PICKUP, LASER (87)
_ Remove FPC, PU CD off CONNECT, and CD Hevea raha ea oy
P.C.B
come
off.
FPC
PU
(C99)
off
PICKUP,
LASER
<e)